Flex Connector Products for the HVAC Industry

Unisource is your single source for all types of flex connectors and expansion joints for the HVAC marketplace

Flex connectors…Our product line includes all styles of connectors, including stainless steel and bronze braided hose assemblies, and stainless steel braided rubber heat pump/fan coil assemblies. These braided assemblies solve problems such as vibration and noise control, as well as providing the ability to accommodate offset pipe motions.

Rubber spherical expansion joints in single and double sphere style are the industry’s best option for absorbing noise and vibration generated by mechanical equipment such as pumps, chillers, and air handlers. These products are also capable of taking up limited amounts of thermal pipe growth.

Bellows pump connectors, expansion compensators, externally pressurized expansion joints, PTFE bellows, and stainless steel bellows expansion joints are available for a variety of pipe expansion applications and equipment connections.

Unisource manufactures the industry’s most complete line of piping expansion joints–rubber, metallic, and PTFE. Check out our Expansion Joint section for information.

Unisource V-Loop connectors are manufactured and designed for both seismic and thermal expansion problem solving. Unisource V-Loops are available for steel or copper piping for a wide range of services, such as mechanical, plumbing, natural gas, fire sprinkler systems, and medical gases.

Unisource HVAC products are marketed through an organization of manufacturers representatives and mechanical equipment distributors throughout the United States and Canada. These representatives stock a wide variety of our standard products.

Whether your choice of flex connectors are rubber, metallic, PTFE…We’ve got it!

Shows flex connectors and rubber spheres on pumps.
HVAC

Flex Connectors and Products for

HVAC Applications – Catalog

HVAC Flex Connector Groups

Rubber Spheres

Series 301 “Ultra Sphere” Single Sphere

 

Precision molded Ultra-Sphere connectors will perform double duty as a vibration elimination pump connector, or as an expansion joint, absorbing pipe movements.

Ultra-Sphere connectors are perfect for HVAC or industrial applications where a flex connector is needed to absorb axial, transverse, or angular pipe movements. Ultra-Sphere rubber connectors are also superior to braided metal connectors for absorbing vibration and noise generated by mechanical equipment.

Ultra-Sphere connectors are precision molded in hydraulic presses. The spherical design ensures that internal pressures are exerted in all directions, distributing the forces evenly over a large area. The spherical design acts as a free-flowing arch, reducing turbulence and growth due to pressure thrust forces.

These connectors are manufactured with a high-quality EPDM rubber tube and cover, and nylon tire cord reinforcing. Special elastomers such as Neoprene, Nitrile, Hypalon, and Butyl are also available. The standard EPDM material is superior to competitive connectors made of Neoprene due to their higher temperature resistance and physical properties. Galvanized steel floating flanges are recessed to engage the rubber beaded end of the expansion joint and rotate easily for speed of installation.

Style U301 single sphere connectors are ideal for absorbing small stress motions and absorbing the noise and vibration emitted by mechanical equipment. The face-to-face dimensions of these single sphere connectors match the corresponding dimensions of spool type expansion joints, facilitating direct replacements. This short face-to-face dimension translates to economy of space in the piping system and ease of handling and installation.

Ultra-Sphere Series 301 & 302 connectors are manufactured to meet or exceed the pressure, movement, and dimensional ratings of the Rubber Expansion Joint Division, Fluid Sealing Association.

Sealing Information: When installing rubber expansion joints, it is the responsibility of the installer to ensure bolting forces are evenly distributed to provide optimum clamping force to prevent the connection from leaking. When the expansion joint is being installed in non-ferrous piping systems, such as PVC, reinforcement of the mating flanges may be required to increase the mating flange rigidity.

Unisource recommends the use of ring gaskets or full face gaskets when a rubber expansion joint is being installed against a raised face flange. The use of ring gaskets or full face gaskets may be required when installing PTFE lined expansion joints. If you should have any questions pertaining to the installation, please call Unisource or refer to the Fluid Sealing Association Technical Handbook for Non-Metallic Expansion Joints.

Shows Unisource Series 301 single sphere flanged rubber flex connector
301PagePic

Product Brochure

301-JOINTPic

Submittal

Tube & Cover
Reinforcement
Pressure Range
Branding
Sizes
Accessories Recommended
Axial Compression
EPDM. Also available in other elastomers Nylon tire cord 225 PSIG in sizes including 12″ See spec sheet for other sizes Permanent rubber labels 1-1/2″ through 20″ Metallic control units  1/2″ to 3/4″ (Depending on size)

Series 302 Ultra Sphere Double-Sphere

 

Series 302 double sphere connectors are similar in construction to the single sphere style, but with a second sphere to provide even more pipe movement absorbing capability and even greater efficiency for noise and vibration control. In fact, Series 302 flex connectors offer the industry’s best option for vibration reduction—up to 98%, depending on pressure and frequency. A plated steel external root ring surrounds the connector between the spheres, preventing ballooning or swelling under pressure

Series 302 double sphere connectors are similar in construction to the single sphere style, but with a second sphere to provide even more pipe movement absorbing capability and even greater efficiency for noise and vibration control. In fact, Series 302 connectors offer the industry’s best option for vibration reduction—up to 98%, depending on pressure and frequency. A plated steel external root ring surrounds the connector between the spheres, preventing ballooning or swelling under pressure

Ultra-Sphere connectors are precision molded in hydraulic presses. The spherical design ensures that internal pressures are exerted in all directions, distributing the forces evenly over a large area. The spherical design acts as a free-flowing arch, reducing turbulence and growth due to pressure thrust forces.

These connectors are manufactured with a high-quality EPDM rubber tube and cover, and nylon tire cord reinforcing. Special elastomers such as Neoprene, Nitrile, Hypalon, and Butyl are also available. The standard EPDM material is superior to competitive connectors made of Neoprene due to their higher temperature resistance and physical properties. Galvanized steel floating flanges are recessed to engage the rubber beaded end of the expansion joint and rotate easily for speed of installation.

Sealing Information: When installing rubber expansion joints, it is the responsibility of the installer to ensure bolting forces are evenly distributed to provide optimum clamping force to prevent the connection from leaking. When the expansion joint is being installed in non-ferrous piping systems, such as PVC, reinforcement of the mating flanges may be required to increase the mating flange rigidity.

Unisource recommends the use of ring gaskets or full face gaskets when a rubber expansion joint is being installed against a raised face flange. The use of ring gaskets or full face gaskets may be required when installing PTFE lined expansion joints. If you should have any questions pertaining to the installation, please call Unisource or refer to the Fluid Sealing Association Technical Handbook for Non-Metallic Expansion Joints.

Shows Unisource Style 302 double sphere rubber flex connector with rotating flanges
302FlyerPagePic

Product Brochure

302SubmittalPagePic

Submittal

Tube & Cover
Reinforcement
Pressure Range
Branding
Sizes
Accessories Recommended
Axial Compression
EPDM. Also available in other elastomers Nylon tire cord 225 PSIG in sizes including 12″ See spec sheet for other sizes Permanent rubber labels 1-1/2″ through 20″ Metallic control units 1-1/2” to 2″(Depending on size)

Series 303 Ultra Sphere Union Connector

 

Unisource Series 303 female union connectors are ideal for isolating small diameter piping from vibrating mechanical equipment.

In smaller size applications where threaded connectors are normally used, Series 303 double sphere union connectors will accommodate both pipe motions and vibration. Series 303 connectors will provide over 1” of axial compensation, as well as impressive ratings for lateral and angular deflection. The Neoprene or EPDM rubber body construction is also far superior to metallic connectors for eliminating noise and vibration generated by equipment such as pumps, chillers, and air handlers. These connectors are extremely versatile and can be used in a variety of services, and are available in designs to handle up to 150 PSIG and temperatures up to 200 degrees F.

Ultra-Sphere expansion joints are precision molded in hydraulic presses. The spherical design ensures that internal pressures are exerted in all directions, distributing the forces evenly over a large area. The spherical design acts as a free-flowing arch, reducing turbulence and growth due to pressure thrust forces.

Series 303 Ultra-Sphere connectors are constructed with a high-quality EPDM tube and cover and nylon tire cord reinforcing. Neoprene construction without cables is also available.

Series 303 EPDM flex connectors offer high-temperature EPDM rubber for tube and cover construction. Galvanized ductile iron threaded female union ends are standard. Special cable restraint attachments surround each end to prevent the connector from over-extending due to pressure thrust. A steel body ring encircles the rubber between the spheres to provide stability under pressure.

Shows Unisource Style 303 threaded connector with cable restraints
303PagePic

Product Brochure

303SubmittalPagePIc

Submittal

Tube & Cover
Reinforcement
Pressure Range
Branding
Sizes
Axial Compression
EPDM. Also available in Neoprene and Nitrile Nylon tire cord 150 PSIG Permanent rubber labels 3/4″ through 3″ 7/8″

Control Units

Control units are recommended for use on Ultra-Sphere connectors when it is not possible to install solid anchors in the piping system. Although it is theoretically possible to pre-elongate spherical connectors to avoid the effects of extension due to pressure thrust forces, Unisource does not recommend this practice in lieu of anchors and control units due to the unpredictability of subsequent pressure spikes and system pressure tests. To isolate vibration that could travel across solid control rods, Unisource utilizes minimum 1/4” thick reinforced grommets on each end of our control unit rods.

A standard control unit set consists of two threaded rods, four triangular plates, eight steel nuts, four flat washers, and four 1/4” thick rubber grommets. Always consult the system engineer to determine the highest pressures that the system will see to determine the number of rods needed. Unisource control units are based on Fluid Sealing Association standards and are rated to equal or exceed the following specifications:

Control Units

Control Unit Specifications

Plate Thickness (In)Rod Diameter (In)Standard Control Unit Assembly of RodsStandard Control Unit Assembly of PlatesNominal Pipe Size Exp. Jt. ID (In)
3/8

1/2241-1/2

3/8

5/8

242
3/8

5/8

242-1/2

3/8

5/8

243
3/8

5/8

244
3/8

5/8

245
1/2

5/8

246
1/2

3/4248
3/4

7/82410
3/4

12412
3/4

22414
3/4

1-1/8

2416
3/4

1-1/8

2418
3/4
1-1/8

2420

Maximum Surge or Test Pressure of the System and Number of Control Rods Recommended

23468
510--------
661--------
529--------
441--------
311467622----
235353
470----
186278371----
163244326----
163244325488--
160240320481--
112167
223335--
113170227340453
94141187281375
79118158236315
CRSingleSubmPagePic

Control Unit Submittal for

Single Sphere

CRSubmDoubPagePic

Control Unit Submittal for

Double Sphere

Stainless Steel Braided Flex Connectors

Series 401 & 401-L Threaded Pump Connectors

Unisource Series 401 & 401-L stainless steel braided flex connectors are the standard of the industry for a rugged, versatile flex product to connect piping to vibrating mechanical equipment.

Series 401 & 401-L stainless steel connectors combine 300 series corrugated stainless steel hose and braid with weld-on carbon steel end fittings for a high-pressure assembly. Standard connectors with stainless steel end fittings are also available. Unisource starts with a high core-count inner hose for greater flexibility and better noise and vibration control efficiency. Many manufacturers utilize a less expensive wide-pitch corrugated hose. A tightly woven stainless steel braid provides high-pressure ratings, even in high-temperature heating water applications. Series 401 threaded flex connectors are made to traditional industry standard overall lengths. These connectors are designed to provide good efficiency for noise and vibration control. Series 401-L are longer length connectors, built for even greater noise and vibration control, and a minimum of 2” permanent lateral offset.

Shows Unisource Series 401 flex connector with threaded ends
401SubmPagePic

Series 401 Submittal

401-LSubmPagePic

Series 401-L Submittal

401&402PagePic

Product Brochure

Hose
End Fittings
Pressure Range
Sizes
Braid
Series 300 stainless steel annular corrugated hose Painted carbon steel MNPT are standard. Stainless steel ends available upon request 250 PSIG to 990 PSIG (Depending on size) 1/2″ through 4″. Smaller and larger sizes available by custom order 300 Series stainless steel

Series 402 & 402-L Flanged Pump Connectors

Series 402 & 402-L stainless steel flex connectors combine 300 series corrugated stainless steel hose and braid with weld-on carbon steel flanges for a high-pressure assembly. Unisource starts with a high corr-count inner hose for greater flexibility and better noise and vibration control efficiency. Many manufacturers utilize a less expensive wide-pitch corrugated hose. A tightly woven stainless steel braid provides high-pressure ratings, even in high-temperature heating water applications. Series 402 is made to traditional industry standard overall lengths. These connectors are designed to provide good efficiency for noise and vibration control. Series 402-L are longer length flex connectors, built for even greater noise and vibration control, and a minimum of 2” permanent lateral offset.

Shows Unisource Series 402 flanged flex connector
402SubmPicPage

Series 402 Submittal

402LSubmPicPage

Series 402-L Submittal

401&402PagePic

Product Brochure

Hose
End Fittings
Pressure Range
Sizes
Braid
Series 300 stainless steel annular corrugated hose Painted carbon steel 150# plate flanges are standard. Stainless steel flanges available upon request 150 PSIG to 455 PSIG (Depending on size) 1-1/2″ through 14″. Smaller and larger sizes available on special order Series 300 stainless steel. Sizes 8″ and larger are braided braid

Series 403 Groove x Groove

& Series 404 Groove x Flange

Unisource Series 403 & 404 stainless steel braided flex connectors are the standard of the industry for a rugged, versatile flex product to connect piping to vibrating mechanical equipment.

Series 403 groove x groove and Series 404 groove x flange stainless steel connectors combine 300 series corrugated stainless steel hose and braid with carbon steel end fittings for a high-pressure assembly. Standard connectors with stainless steel end fittings are also available. Unisource starts with a high corr-count inner hose for greater flexibility and better noise and vibration control efficiency. Many manufacturers utilize a less expensive wide-pitch corrugated hose. A tightly woven stainless steel braid provides high-pressure ratings, even in high-temperature heating water applications. Series 403 and 404 flex connectors are made to traditional industry standard overall lengths. These connectors are designed to provide good efficiency for noise and vibration control. Series 403-L and 404-L are longer length flex connectors, built for even greater noise and vibration control, and a minimum of 2” permanent lateral offset.

Shows Unisource Series 403 groove x groove flex connector
Shows Unisource Series 404 groove x flange flex connector
403,404,405PagePic

Series 403 & Series 404 – Brochure

403SubmPagePic

Series 403 Submittal

404SubmitPagePic

Series 404 Submittal

Hose
End Fittings
Pressure Range
Sizes
Braid
Series 300 stainless steel annular corrugated hose Painted carbon steel 150# plate flanges or schedule 40 grooved ends 140 PSIG to 455 PSIG (Depending on size) 2″ through 12″. Smaller and larger sizes flex connectors available on special order. Series 300 stainless steel. Sizes 8″ and larger are braided braid

Series 405 Reducing Flanged Flex Connectors

Unisource Series 405 connectors are a material and labor saving device designed to provide vibration and noise isolation when connected between piping and vibrating equipment. These special connectors are intended to facilitate a reduction in pipe size when connecting to mechanical equipment. They are normally installed on the discharge side of HVAC pumps. Since Series 405 connectors incorporate a reduced size flange on one side, it eliminates having to install both a straight flex connector and a pipe reducer. Series 405 flex connectors utilize Superflex series 300 stainless steel hose and braid, carbon steel flanges, and carbon steel bell reducers. Longer length flex connectors are available on request to provide additional lateral deflection and increased vibration control efficiency.

Shows Unisource Series 405 reducing flex connector
403,404,405PagePic

Series 405 – Brochure

405SubmPagePic

Series 405 – Submittal

Hose
End Fittings
Pressure Range
Sizes
Braid
Concentric Reducer
Series 300 stainless steel annular corrugated hose Painted carbon steel 150# plate flanges. Other end configurations available 160 PSIG to 395 PSIG (Depending on size) 2-1/2″ x 2″ through 12″ x 10″. Smaller and larger sizes available on special order Series 300 stainless steel. Sizes 8″ and larger are braided braid Painted carbon steel, Sch. 40

Series 406, 407, 408, & 409 Straight CSA Rated Connectors For Natural Gas

Unisource CSA rated flex connectors are specifically designed for use as a flex connector in medium pressure natural gas applications. These heavy-duty connectors are CSA certified and can be fabricated with any of four different end configurations:

Each flex connector assembly is factory pressure-tested and is rated to 350 PSIG working pressure. Safety factors range from a minimum of 4:1 in 4” size to greater than 15:1 in size 1/2”. Finished assemblies are labeled with manufacturer, part number, maximum working pressure, certification report number, serial number and CSA logo. Unisource CSA rated connectors are intended to provide vibration isolation and accommodate offset pipe motion. Unisource recommends a minimum 24” overall length, but the user may specify other overall lengths in keeping with the hose ratings for static and dynamic bend radius.

Shows Unisource CSA braided flex connectors
  • Series 406 – 150# carbon steel weld neck flanges.
  • Series 407 – Sch 80 male carbon steel NPT hex ends.
  • Series 408 – Sch 80 carbon steel beveled weld ends.
  • Series 409 – 300# ANSI carbon steel RFSO flanges
CSASF21PagePic

Series 406, 407, 408, 409 Straight CSA Rated Flex Connectors – Brochure

CSASF21SubmPagePic

CSA Rated Straight Flex Connectors – Submittal

Hose
End Fittings
Pressure Range
Sizes
Braid
Series 300 stainless steel annular corrugated hose Style 49 – 150# carbon steel weld neck flanges; Style 58 – 300# carbon steel raised-face flanges; Style 50 – Sch 80 male carbon steel NPT hex ends; Style 52 – Sch 80 carbon steel beveled weld ends 335 PSIG to 350 PSIG (Depending on size). 1/2″ through 4″ Series 300 stainless steel. Single or double braid, depending on size

SF21 Special Metal Hose Assemblies

Unisource stainless steel flex connector (as well as bronze hose) can be made to order upon request with typically no minimum quantity. Order by size and choose either the overall length or live length you prefer, along with the weld on fittings you would like on each end. Important considerations in deciding on the proper assembly would be the working pressure, media, type of bending or vibration, velocity of media, and temperature. Choose either painted carbon steel ends or stainless steel.

Visit our Flexible Metal Hose section for more information and specifications on our broad line of corrugated and braided metal hose.

Superflex options:

  1.  Choose your overall flex connector length
  2.  Select either single braid or double braid
  3.  The fitting material can be carbon steel, stainless steel, or copper

End Fitting Styles:

  • Sch 40 or Sch 80 pipe threads
  • Hex wrenching surface
  • Beveled weld ends
  • Plate, raised-face, and weld neck flanges
  • Floating flanges
  • 150#, 300#, or 600# drill patterns
  • 150# or 3000# unions
  • JIC
  • Grooved
  • Copper sweat (tube) or copper hex male NPT
Metal-Hose-Cover-Pic

Flexible Metal Hose – Full Catalog

Link picture for SF21 threaded flex connector

SF21 Metal Hose – Threaded End Submittal

Link picture for SF21 flanged flex connectors submittal

SF21 Metal Hose – Flanged End Submittal

Hose
End Fittings
Pressure Range
Sizes
Braid
End Fitting Material
Series 300 stainless steel annular corrugated hose Flanges, threaded, beveled weld ends, grooved, JIC, tube end, copper sweat or threaded, etc. 212 PSIG to 2715 PSIG (Depending on size and braid) 1/4″ through 12″. Larger sizes available on special order Series 300 stainless steel. Single or double braid, depending on pressure Carbon steel, stainless steel, copper, Monel

Flex Connectors for Copper Piping

Series 410 & 411 Bronze Braided Flex Connectors

Series 412

U.L. Vibration Absorbers

Series 413 Flex Connectors

Type HP

Bronze braided connector
Shows Unisource Series 412 Vibration Absorber
Shows Unisource Series 413 heat pump connectors

Series 410 & 411 flex connectors are the standard of the industry in braided connectors for copper piping. This style connector is constructed with bronze corrugated hose and braid for flexibility and optimum resistance to flux chemicals. Stainless steel hose and braid is available for higher-pressure ratings. The traditional overall lengths of Series 410 & 411 connectors are designed to isolate equipment vibration and minimum permanent offset. Longer length connectors can be fabricated upon request that will accommodate greater lateral pipe motions.

Series 411 is offered with standard copper sweat/tube ends. Series 410 is built with copper hex male NPT ends These connectors are typically in stock in sizes ranging from 1/2” to 3” diameter.

Unisource Series 412 flex connectors are ideal for use as either a U.L. rated vibration eliminator in refrigeration applications or as an extended length HVAC connector for copper pipe. Series 412 connectors are offered in the standard bronze braided style or with stainless steel hose and braid, combining the exceptional physical properties of stainless steel hose and braid with copper tube end connections. Our advanced attachment process ensures a positive, corrosion-free end fitting at an economical cost. The end result is high working pressures, high temperature ratings, corrosion resistance, and longer product life. U.L. recognized. Please note that chlorinated or acid flux should not be used in combination with the optional stainless steel braided Series 412 connectors.

Unisource Series 413 flex connectors are specifically designed for connecting to H.V.A.C. water equipment. These economically priced assemblies are ideal for heat pump/fan coil applications and are equal to or surpass specifications for most competitive hose assemblies built for similar applications. In addition, Series 413 conforms to ASTM E 84-01 for fire rating.

Series 413 flex connectors are constructed using an EPDM rubber inner core, stainless steel exterior braid, 304L stainless steel crimp ferrules, and either brass or zinc dichromate steel threaded ends. End connections are male solid NPT one end and a swivel adapter producing male swivel NPT on the other end. Operating pressure ratings are calculated at an average of 4:1 safety factor. Available sizes are 1/2″ I.D. through 2″ I.D. and lengths from 12″ overall to 36″ overall.

Additional Specifications

Hose
End Fittings
Sizes
Braid
Bronze. Annular corrugations Copper female sweat 1/2″ through 3″ Single or double bronze braid

Additional Specifications

Hose
End Fittings
Sizes
Braid
Annular bronze corrugated hose. (Sizes 2-1/2″ and larger are stainless steel corrugated annular hose) copper tube ends 1/4″ through 2-5/8″ Single bronze braid. (Sizes 2-1/2″ and larger are single braid annular T304 stainless steel)

Additional Specifications

Hose
End Fittings
Temperature
Pressure Range
Sizes
Braid
EPDM rubber inner core Steel crimp ferrules, brass or plated steel threaded ends. Male NPT solid one end, male NPT swivel other end -40 Deg. F to +302 Deg. F 300 PSIG to 500 PSIG (Depending on size) 1/2″ through 2″ 300 Series stainless steel

Link picture to Series 410, 411, 412 brochure

Series 410, 411 & 412 – Product Brochure

Link pictures to Series 413 heat pump hose brochure

Series 413 – Product Brochure

Link picture to the Series 410 vibration absorber submittal

Series 410 – Submittal

Link picture to the Series 411 vibration absorber submittal

Series 411 – Submittal

Link picture to the submittal for Series 412 vibration absorbers

Series 412 – Submittal

Link picture to the submittal for Series 413 heat pump hose

Series 413 – Submittal

Special HVAC Connectors

Series 414, 415, & 416 Expansion Compensators

For the compensation of thermal growth in small diameter piping systems, Unisource Series 414, 415, & 416 Expansion Compensators are the ideal choice. These economical expansion compensation components utilize the design theory behind externally pressurized expansion joints that are used in large diameter steam piping and apply these designs to a smaller size, lower temperature piping systems.

Unisource Expansion Compensators are often used in HVAC systems such as hot water lines and steam condensate to absorb the effects of thermal pipe growth. Like externally pressurized expansion joints, Unisource expansion compensators are a packless, maintenance-free joint that incorporates an all stainless steel multi-ply flexible bellows, a steel enclosure, with an external and internal guide ring/sleeve to maintain proper alignment of the inner pipe. The sleeve isolates the bellows from media, eliminating flow turbulence. External pressure is applied to the bellows via a gap between the internal flange and the housing. Bellows squirm is eliminated by means of an internal flange, and also guides the bellows along the longitudinal center-line. The external pressure keeps the bellows stable. For proper operation, expansion compensators must be adequately anchored and guided.

Choose from either Series 414 with carbon steel male NPT threaded ends, Series 415 with carbon steel beveled weld ends, or Series 416 with copper tube ends. Carbon steel beveled weld ends or flanged ends can be attached upon request. Most styles are available in sizes from 3/4” through 4”. All sizes and styles are rated for 2” of axial travel. Caution: manufacturing process utilizes silver brazing. Do not exceed 1000°F during installation.

Shows Unisource Series 414 expansion compensators
Link picture to the brochure for Series 414, 415, 416

Series 414, 415, 416 – Product Brochure

Link picture to the submittal for Series 414 expansion compensators

Series 414 Threaded – Submittal

Link picture to the submittal for Series 416 expansion compensators

Series 416 Copper Sweat – Submittal

Pressure Range
Axial Travel
Bellow Material, End Configurations
200 PSIG 1.75″ compression; 0.25″ elongation Series 300 stainless steel bellows. Male NPT, copper sweat, or weld ends.

Series 418 & 419 Bellows Pump Connectors

 

Series 418 & 419 Bellows Pump Connectors are an ideal solution when a flexible pipe connector is required in severe service applications.

Often, an application will require a connector to isolate noise and vibration, relieve stresses on equipment, and handle both high-temperatures and axial motion. Rubber connectors will have relatively low-pressure ratings at high temperatures. Braided connectors can offer high pressure/ high-temperature capabilities, but do not offer any axial movement capabilities. Pressure ratings of bellows pump connectors are virtually unaffected by high system temperatures and these special connectors are able to absorb limited amounts of axial travel and lateral offset.

The special design of Unisource Series 418 & 419 connectors includes multi-ply stainless steel bellows to provide long life and isolation in high-frequency applications. Three built-on tie rods prevent over-extension in high-pressures and eliminate jobsite installation of rod assemblies. Special rubber grommets are installed on each end of rods so that noise and vibration is not transmitted across the steel rods.

Series 418 bellows pump connectors are our standard overall length connector designed to provide 1/2” compression and 1/8” lateral motion, plus pump vibration. Series 419 connectors are constructed in overall lengths to match standard single rubber connectors. Series 419 connectors will provide about 1” compression, 3/8” extension and from 1/8” to 5/16” lateral motion, plus pump vibration. Sizes larger than 12” upon request.

Shows Unisource Series 418 bellows pump connectors
Series418,419PagePic

Series 418, 419 – Product Brochure

418SubmPagePic

Series 418 – Submittal

419SubmPagePic

Series 419 (Style R) – Submittal

Sizes
Axial Compression
Axial Extension
Pressure Rating
Bellows Material
Flanges
2″ thru 12″ 1/2″ to 1-1/4″

depending on size

1/8″ to 3/8″

depending on size

225 PSI

at 70 Deg. F.

2 Ply 304 S/S 150# ASA C/S

w/three tie rods

Unisource V-Loops for Seismic Compensation in Piping Systems

Specified by consulting engineers and building owners and installed by contractors throughout the world for many years, Unisource V-Loops solve the problems of pipe motion caused by thermal pipe growth and the unpredictable movements associated with seismic activity. Unisource V-Loops can perform the functions of large pipe loops or expansion joints, and in addition, can provide protection and flexibility in multiple planes during potentially catastrophic earthquakes.

Unlike large pipe loops, Unisource V-Loops take up a minimum of space, providing pipe motion accommodation solutions in limited space situations such as indoor piping. The small configuration of the Unisource V-Loops are also far less susceptible to the heat loss that must be dealt with in the case of large pipe loops.

Whereas metal bellows or rubber expansion joints will impose substantial anchor loads due to the effects of static pressure thrust, Unisource V-Loops will not introduce any thrust loads on the piping system. The unique construction of the braided V-shaped loop creates a flexible product that does not expand when pressurized. A welded-on braid acts as a restraining device, even at extended pressures, yet allows tremendous flexibility. Anchor loads in regard to the Unisource V-Loops are confined to the relatively small spring forces required to deflect the flexible legs within the loop. Unlike expansion joints, a minimum of pipe guiding is required.

Unisource V-Loops are extremely easy to design in nested configurations. Due to the inherent V-design, standard Unisource V-Loops can simply be nested within each other with relatively tight centering. A substantial amount of space can be saved, and since no additional pipe extensions need to be installed in the Unisource V-Loops,

standard models can be used, saving cost and reducing delivery time.

The standard position for the Unisource V-Loop is in a horizontal pipe run, with the elbow pointing straight down. Positioning is versatile, however, and the loops can be installed in many other positions such as laying the loop horizontal, positioning the elbow straight up, or positioning for vertical pipe run. In installations other than the standard position, Unisource can provide a support eyelet to allow a cable or rod to support the weight of the loop and its contents.

Unisource V-Loops can be used for a variety of fluids and gases. Loops can be constructed using stainless steel hose and braid with carbon steel end fittings and elbows, or with bronze hose and braid with copper end fittings and elbows. End fitting options include flanges, male threads, beveled weld ends, grooved ends, and copper sweat. Use Unisource V-Loops for applications such as heating and cooling water in HVAC systems; moderate velocity steam; natural gas; medical gases; fire sprinkler piping; and selected process applications. Drain ports can be added where required.

For higher pressure applications, Unisource V-Loops can be constructed using double braided hose legs. Consult Unisource for specific pressure ratings.

Standard Unisource V-Loops are offered for either 2” or 4” of motion from center-line in axial and offset planes. Loops for even greater motions can be constructed upon request.

All Unisource V-Loops are shipped complete with installation instructions wire tagged to each product. Unisource offers loops for applications under the auspices of the CSA/AGA, NFPA, and U.L.

Shows three Unisource V-Loops nested
Series418,419PagePic

V-Loop Basic Information

Unisource V-Loops for Thermal Pipe Movements

Unisource V-Loops are an ideal option for compensating for thermal pipe growth. Often, thermal pipe growth must be absorbed in piping systems where the substantial anchoring systems that bellows expansion joints would require are not present. Since these “V” shaped flexible hose loops do not impose pressure thrust forces on the anchoring system, anchor loads are very low. The only forces involved are the spring forces required to flex the loops. Unisource V-Loops are an in-line connector and consist of a 90-degree pipe elbow with a flexible stainless steel or bronze hose leg connecting to each end of the elbow. 45-degee pipe elbows are located at the ends of the flex leg and end fittings are welded to the 45-degree elbows. End options are flanges, pipe threads, beveled weld ends, grooved ends, and copper sweat ends. Standard Unisource V-Loops are rated for either 2” or 4” of motion, but can be build to absorb greater movements. Since Unisource V-Loops do not impose thrust forces on the pipe system, a minimum of guiding is required. For steam applications, a drain port can be added at the center elbow. Loops can be configured with the 90-degree elbow hanging straight down or with support at the 90-degee elbow, can be positioned in an inverted position, horizontal, or in a vertical riser application.

See the HVAC section under Special Market Focus more more information and submittal on Unisource V-Loops.

Shows diagram of Unisource V-Loop with descriptions

Elbows
Pressure Range
Sizes
Braid
Allowable Motions
Drain Port
End Connections
Carbon steel, stainless steel, or copper 160 PSIG to 1335 PSIG (Depending on size). Double braided higher pressure loops also available 1/2″ through 12″ Choose either 300 series stainless steel or bronze 2” or 4″ are standard. More motion can be accommodated upon request Carbon steel or bronze with tapered plug Flanged, threaded, beveled weld end, grooved, copper sweat

Series 420 V-Loops – Flanged

 

A flanged end loop with carbon steel Class 150 plate flanges as standard ends. Raised face flanges (Series 421) or virtually any other flange configuration can also be ordered. Schedule 40 carbon steel elbows are also standard, but can be specified in other materials.

As in other configurations of Unisource V-Loops, choose from either 2” or 4” of motion from center-line. For steam service, Unisource recommends placing the loops in either an inverted or horizontal installation when conveying steam. A drain port should also be specified for steam service. Unisource can also add an eyelet at the 90 degree elbow to accommodate a support rod or cable. Pre-designed in sizes from 1-1/2 inch through 12 inch. Available in custom construction up to 18 inch diameter and in movements as great as 24 inch.

Shows Unisource Series 420 flanged V-Loop
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Series 420 Flanged V-Loop – Product Brochure

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Series 420-2 V-Loop – Submittal

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Series 420-4 V-Loop – Submittal

Hose
End Fittings
Elbows
Pressure Range
Sizes
Braid
Allowable Motions
Type 321 stainless steel annular corrugated hose Painted carbon steel 150# drilled plate flanges. 300# drilled flanges or stainless steel flanges available upon request Painted Sch. 40 carbon steel 90-degree and 45-degree elbows. Stainless steel available upon request 160 to 472 PSIG 1-1/2″ through 12″ Type 304 stainless steel. Sizes 8″ and larger are braided braid 2″ or 4″ Standard

Series 425 Threaded & Series 430 Weld End V-Loops

 

Series 425 is a loop with carbon steel male NPT threaded ends as standard. Female union ends can also be specified (Series 426). As in other configurations of Unisource V-Loops choose from either 2” or 4” of motion from center-line. For steam service, Unisource recommends placing the loops in either an inverted or horizontal installation when conveying steam. A drain port should also be specified for steam service. Unisource can also add an eyelet at the 90-degree elbow to accommodate a support rod or cable.

Series 430 loops are configured with carbon steel schedule 40 beveled weld ends as standard. As in other configurations of Unisource V-Loops choose from either 2” or 4” of motion from center-line. For steam service, Unisource recommends placing the loops in either an inverted or horizontal installation when conveying steam. A drain port should also be specified for steam service. Unisource can also add an eyelet at the 90 degree elbow to accommodate a support rod or cable.

Shows Unisource Series 425 threaded V-Loop
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Series 425 Threaded V-Loop – Product Brochure

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Series 425-2 Threaded V-Loop – Submittal

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Series 425-4 Threaded V-Loop – Submittal

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Series 430 Weld End V-Loop – Product Brochure

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Series 430-2 Weld End V-Loop – Submittal

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Series 430-4 Weld End V-Loop – Submittal

Hose
End Fittings
Elbows
Pressure Range
Sizes
Braid
Allowable Motions
Type 321 stainless steel annular corrugated hose Painted carbon steel 150# drilled plate flanges. 300# drilled flanges or stainless steel flanges available upon request Painted Sch. 40 carbon steel 90-degree and 45-degree elbows. Stainless steel available upon request 160 to 1075 PSI 1-1/2″ through 12″ Type 304 stainless steel. Sizes 8″ and larger are braided braid 2″ or 4″ Standard

Series 435 V-Loops – Grooved Ends

 

Series 435 Unisource V-Loops loops are constructed with carbon steel standard grooved ends for easy installation.

As in other configurations of Unisource V-Loops, choose from either 2” or 4” of motion from center-line. Unisource can also add an eyelet at the 90-degree elbow to accommodate a support rod or cable.

Shows Unisource Series 435 Grooved End V-Loop
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Series 435 Grooved End V-Loop – Brochure

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Series 435-2 Grooved End V-Loop – Submittal

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Series 435-4 Grooved End V-Loop – Submittal

Hose
End Fittings
Elbows
Pressure Range
Sizes
Braid
Allowable Motions
Type 321 stainless steel annular corrugated hose Painted carbon steel grooved ends Painted Sch. 40 carbon steel 90-degree and 45-degree elbows. Stainless steel available upon request 160 to 472 PSIG 1-1/2″ through 12″ Type 304 stainless steel. Sizes 8″ and larger are braided braid 2″ or 4″ Standard

Series 440 V-Loops – Copper Sweat

Series 440 Unisource loops are designed specifically for copper piping systems. They are constructed with copper female sweat ends and copper elbows and either stainless steel braided hose or bronze braided hose, depending on size.

As in other configurations of Unisource V-Loops, choose from either 2” or 4” of motion from center-line. Unisource can also add an eyelet at the 90-degree elbow to accommodate a support rod or cable.

Bronze braided V-Loop with copper ends
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Series 440 Copper Sweat V-Loop – Brochure

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Series 440-2 Sweat End – 1/2″ Thru 2″

V-Loop – Submittal

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Series 440-2 Sweat End – 2-1/2″ Thru 4″

V-Loop – Submittal

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Series 440-4 Sweat End – 1/2″ Thru 2″

V-Loop Submittal

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Series 440-4 Sweat End – 2-1/2″ Thru 4″

V-Loop Submittal

Hose
End Fittings
Elbows
Pressure Range
Sizes
Braid
Allowable Motions
Annular bronze corrugated hose. (Sizes 2-1/2″ and larger are stainless steel corrugated annular hose) Copper female sweat Copper 90-degree and 45-degree elbows. (Sizes 2-1/2″ and larger uses 304 stainless steel 90 degree center elbow). Copper to stainless welds utilize silver braze method) 270 PSIG to 642 PSIG (Depending on size) 1/2″ through 4″ Single bronze braid. (Sizes 2-1/2″ and larger are single braid annular T304 stainless steel) Choose either 2” or 4″ as standard product. Greater movement capabilities can be accommodated upon request

Series 445 & Series 450 – CSA Rated For Natural Gas – Threaded & Weld End

 

Unisource Series 445 threaded and Series 450 weld-end V-Loops are designed specifically for natural gas piping and are certified by CSA International for gas piping applications (Certification Report No. 190623-1131571).

Series 445 and Series 450 gas loops are constructed with stainless steel hose and braid, carbon steel Sch 40 elbows and either male NPT ends (Series 445) or beveled weld ends (Series 450). Unisource gas loops are rated for minimum working pressures of 150 PSIG, with extremely high burst to working pressure ratios. Drain port and hanger eyelets are options.

Series 445 and Series 450 V-Loops are rated for 4” of motion from center-line. Size range is from 1/2” through 4”.

CSA Rated V-Loops
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Series 445 & 450 CSA V-Loops – Brochure

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Series 445 CSA Threaded V-Loop – Submittal

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Series 450 CSA Weld End V-Loop – Submittal

Hose
End Fittings
Elbows
Pressure Range
Sizes
Braid
Allowable Motions
Corrugated stainless steel Carbon steel Male NPT or beveled weld ends Carbon steel Sch 40 150 PSIG 1/2″ through 4″ Single braid of stainless steel 4” allowable as standard product. Greater movement capabilities can be accommodated upon request

Series 455 – “MedFlex” Medical Gas Loops

Series 455 “MedFlex” loops are produced specifically for medical gas applications and are documented, purged, and brazed to NFPA (National Fire Protection Association) standards. In addition, “MedFlex” loops are cleaned, capped, and bagged in accordance with CGA (Compressed Gas Association) G-4.1

“MedFlex” loops are constructed with bronze hose and braid, copper return elbow, and copper sweat end connections. Sizes 2-1/2” through 4” utilize stainless steel hose and braid, stainless steel return elbow, and copper sweat end fittings silver brazed to the assembly.

Unisource V-Loops can be included into specific seismic bracing designs for submission to the California Office of Statewide Health Planning and Development (OSHPD) for use in health care facilities.

Like other Unisource V-Loop products, “MedFlex” loops are capable of motion in all directions. Due to the unique design, “MedFlex” loops can be installed anywhere that building motion or pipe movement may be experienced—seismic applications, thermal pipe growth, or building settling. The “MedFlex” loop is versatile. It may be installed in a variety of configurations and can even be nested to save space. Standard “MedFlex” loops are designed for 4” of allowable motions, however loops to accommodate greater motions can be constructed.

Whereas metal bellows or rubber expansion joints will impose substantial anchor loads due to the effects of static pressure thrust, Unisource V-Loops will not introduce any thrust loads on the piping system. The unique construction of the braided V-shaped loop creates a flexible product that does not expand when pressurized. A welded-on braid acts as a restraining device, even at extended pressures, yet allows tremendous flexibility. Anchor loads in regard to the Unisource V-Loops are confined to the relatively small spring forces required to deflect the flexible legs within the loop. Unlike expansion joints, a minimum of pipe guiding is required.

Unisource V-Loops are extremely easy to design in nested configurations. Due to the inherent V-design, standard V-Loops can simply be nested within each other with relatively tight centering. A substantial amount of space can be saved, and since no additional pipe extensions need to be installed in the Unisource V-Loops, standard models can be used, saving cost and reducing delivery time.

The standard position for the V-Loop is in a horizontal pipe run, with the elbow pointing straight down. Positioning is versatile, however, and the loops can be installed in many other positions such as laying the loop horizontal, positioning the elbow straight up, or positioning for vertical pipe run. In installations other than the standard position, Unisource can provide a support eyelet to allow a cable or rod to support the weight of the loop and its contents.

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Series 455 “MedFlex” V-Loops – Brochure

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Series 455 “MedFlex” 1/2″ to 2″ V-Loop – Submittal

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Series 455 “MedFlex” 2-1/2″ to 4″ V-Loop – Submittal

Hose
End Fittings
Elbows
Pressure Range
Sizes
Braid
Allowable Motions
Bronze corrugated hose (stainless steel in sizes 2-1/2” thru 4”) Copper sweat Copper return elbow (stainless steel return elbow on sizes 2-1/2” thru 4”.) (Copper to stainless welds utilize silver braze method) 566 to 232 PSIG (depending on size) 1/2″ through 4″ Bronze (stainless steel in sizes 2-1/2” thru 4”) 4″

Unisource “FireV” U.L. Rated V-Loops for Fire Sprinkler Systems

 

Unisource “FireV” flexible seismic loops are built to accommodate the unpredictable movements of fire sprinkler piping during seismic incidents. The innovative designs of our “FireV” combines flexible, braided stainless steel hose and braid with piping elbows to provide an engineered solution to seismic movement, while not requiring a change of direction. Tested and listed by U.L. (Underwriters Laboratories) for fire sprinkler applications, Unisource FireV loops can absorb as much as 24″ of seismic motion in all three planes of movement.

Also, unlike any other fire sprinkler loops on the market, the V-configuration allows for fire sprinkler piping to be nested within other adjacent V-Loops. This feature saves space and eliminates the need for successively longer pipe extensions at the base of the loop.

Basic “FireV” construction includes Schedule 40 carbon steel 90-degree center elbow and 45-degree elbows at either end (eliminating the need for a change of piping direction).

End fittings can be carbon steel grooved ends, carbon steel male NPT, carbon steel beveled weld end, and carbon steel flanges.

Our standard listed seismic movement limits are generally 4-inches, 8-inches, or 24-inches, but any rating within 24-inches may be specially ordered. Each “FireV” loop is labeled with the appropriate U.L. identification, listing number, and part number. “FireV” loops are 100% pre-tested to U.L. standards prior to shipment and are shipped with installation instructions wire-tagged to the loop. Special shipping containers are used at no additional cost to protect the loops during shipment and during job-site storage. Sizes range from 1/2-inch through 8-inch diameter.

End configurations include Style 436 grooved, Style 421 flanged, Style 426 threaded, and Style  431 with beveled weld ends.

Unisource “FireV” U.L. rated fire sprinkler loops are also listed for use in Canada.

Flexible loops for Fire

“FireV” Seismic V-Loop – Booklet

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Pressure Drop Information

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Series 436-4 Grooved Submittal

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Series 436-8 Grooved Submittal

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Series 421-4 Flanged Submittal

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Series 421-8 Flanged Submittal

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Series 426-4 Threaded Submittal

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Series 426-8 Threaded Submittal

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Series 431-4 Weld End Submittal

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Series 431-8 Weld End Submittal

Hose
Elbows
Braid
Drain Port
Type 321 stainless steel annular corrugated hose Painted Sch. 40 carbon steel 90-degree and 45-degree elbows. Stainless steel available upon request 300 Series stainless steel Carbon steel with tapered plug

Unisource “FireU” U.L. Rated U-Shaped Loops for Fire Sprinkler Systems

A tried-and-true stainless steel braided flexible seismic loop for fire sprinkler systems.

Unisource “FireU” flexible U-shaped seismic loops are built to accommodate the unpredictable movements of fire sprinkler piping during seismic incidents. The innovative designs of our “FireU” combines flexible, braided stainless steel hose and braid with piping elbows to provide an engineered solution to seismic movement, while not requiring a change of direction. Tested and listed by U.L. (Underwriters Laboratories) for fire sprinkler applications, Unisource FireU loops can absorb as much as 24″ of seismic motion in all three planes of movement.

Basic “FireU” construction includes Schedule 40 carbon steel 180-degree center elbow and 90-degree elbows at either end (eliminating the need for a change of piping direction)

End fittings can be carbon steel grooved ends, carbon steel male NPT, carbon steel beveled weld end, and carbon steel flanges. Our standard listed seismic movement limits are generally 4-inches, 8-inches, or 24-inches, but any rating within 24-inches may be specially ordered. Each “FireU” loop is labeled with the appropriate U.L. identification, listing number, and part number.

“FireU” loops are 100% pre-tested to U.L. standards prior to shipment and are shipped with installation instructions wire-tagged to the loop. Special shipping containers are used at no additional cost to protect the loops during shipment and during job-site storage. Sizes range from 1-1/2-inch through 8-inch diameter.

End configurations include Style 436U grooved, Style 421U flanged, Style 426U threaded, and Style 431U with beveled weld ends.

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Series 436U-4 Grooved Submittal

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Series 436U-8 Grooved Submittal

Hose
Reinforcement
End Fittings
Elbows
Branding
Sizes
Allowable Motions
Drain Port
Type 321 stainless steel annular corrugated hose Stainless steel braid Carbon steel grooved. Also available in flanged, threaded & weld end styles. Painted Sch. 40 carbon steel 180-degree and 90-degree elbows. Stainless steel available upon request.   U.L. Labeled for Fire Sprinkler Systems  1-1/2″ through 8″  4″ or 8″ of movement are standard. Special order up to 24″ of movement.  Carbon steel with tapered plug

Bellows Expansion Joints

Series FFB Stainless Steel Bellows Expansion Joints

Series FFB Free-Flexing Expansion Joints are manufactured using multi-corrugation metal bellows, and flanged or weld type end connections. Accessories such as tie rods, limit rods, flow liners, and covers can be added, depending on the application. Free-flexing expansion joints are used to control axial pipe movements that typically arise due to thermal expansion. Limited lateral offset, angular rotation, and vibration isolation can also be accommodated. Mid-corrugation bellows are an economical choice when average movements are experienced. High-corr bellows should be used to absorb greater movements. Where expected motions are greater than what a single bellows can accommodate, dual bellows with a center anchor base can be used. Bellows pressure carriers include low pressure exhaust bellows, 50 psi, 150 psi, and 300 psi. Single ply bellows are standard. Multi-ply bellows are well suited for those applications requiring low spring rate or where cyclical vibration may be a problem. Standard materials include T304, 321, and 316 stainless steel, as well as Inconel, Monel, and other alloys. Meets MIL-E-17813F Type 1, Class 1 and Class 2. Series FFB bellows expansion joints are designed and constructed per application to meet specific design requirements regarding combinations of pressure, temperature, motions, and cycle life. All Series FFB bellows are manufactured in accordance with the Expansion Joint Manufacturers Association (EJMA).

FFBFlyerPagePic-1

Series FFB Bellows Expansion Joint Brochure

Pressure Range
Sizes
Bellow Material
End Connections
Standards
Up to 300 PSIG 2″ to 144″ diameter 304, 321, or 316 stainless steel, Inconel, Monel, or other alloys Fixed flange, floating flange, or beveled weld end style EJMA, MIL-E-17813F Type 1 Class 1 & 2. ASME welding standards.

Controlled Flexing Expansion Joint

Series CF Controlled-Flexing Expansion Joints

Series CF Controlled Flexing Expansion Joints combine high-corrugation free flexing bellows with mated neck rings, and equalizing or control rings. This heavy-duty construction allows their use with higher pressures and larger axial movements than a standard high-corr unit would be able to accommodate. Each of the equalizing rings that fit into the corrugations are extended in a “T” shape over the bellows. The tops of these rings will begin to make contact when the bellows are compressed, spreading the movement equally over each convolution. Bellows squirm and buckling is controlled. Controlled flexing expansion joints are ideal for steam piping to compensate for thermal growth. Selections include either 150# or 300# bellows, and in single or dual configuration. Single bellows are available to absorb up to 8 inches of motion. Dual units with center anchor base can absorb up to 16 inches of motion. End fittings can be plate flange, forged flange, or weld ends. Controlled-flexing joints are rated for full-vacuum, and temperatures from -20 to 800°F. Meets MIL-E-17813F Type II Class 1 or 2.

Pressure Range
Sizes
Bellow Material
End Connections
Standards
Up to 300 PSIG 2″ to 144″ diameter 304, 321, or 316 stainless steel, Inconel, Monel, or other alloys Fixed flange, floating flange, or beveled weld end style EJMA, MIL-E-17813F Type 1 Class 1 & 2. ASME welding standards.

Series EP Externally Pressurized Expansion Joints – Single & Dual Units

Series EP 150 PSI & 300 PSI Styles

Series EP Externally Pressurized Expansion Joints are used in straight runs of pipe to accommodate large amounts of thermal expansion. Typical applications would include steam systems, where extreme temperature differentials would cause thermal growth of the piping system. Series EP expansion joints are a packless, maintenance-free joint that incorporates an all stainless steel flexible bellows, a steel enclosure, with external and internal guide ring/sleeve to maintain alignment of the inner pipe. The sleeve isolates the bellows from media, eliminating flow turbulence. External pressure is applied to the bellows via a gap between the internal flange and housing. Movement limitation is accomplished by means of an internal flange, and also guides the bellows along the longitudinal centerline. The external pressure keeps the bellows stable.

Externally pressurized expansion joints have significant advantages over pipe loops because they are able to absorb very large axial movements and take up far less space than pipe loops. Typically these applications are indoors, in utility tunnels, or buried where extra space is not available. Series EP joints also are frequently specified instead of slip joints that are also engineered for large movements because of several factors.

Slip joints are a packed product that required periodic inspection and maintenance. Access vaults are always required for packed joints. Series EP externally pressurized joints are of a packless, all-welded construction that does not require inspection and can be installed in remote locations or even directly buried. Unisource Series EP externally pressurized expansion joints are a long-life quality piping product that carries a Five-Year Limited Leak-Free/Maintenance-Free Warranty. Contact Unisource for details.

Select either 150 PSIG or 300 PSIG bellows construction. Single bellows styles are available for 4″, 6″, or 8″ of axial travel. Dual bellows units with center anchor base are rated for 8”, 12”, or 16” of axial travel. Flanges or weld end are additional options. Meets MIL-E-17813F Type II Class 4. Standard bellows are constructed of single ply or multi-ply Type 304 stainless steel and are suitable for most chloride free applications such as steam, condensate, oil, and chilled water. Where chlorides may be present, Inconel 600 bellows should be specified. Special bellows material would include 316SS, 321SS, Inc 600, and Inc 625. Other bellows alloys are available upon request. Pipe and end connections are plain steel.

Contact Unisource for information on dual externally pressurized units. Submittal data on single and dual units available upon request.

Externally pressurized expansion joint

Pressure Range
Anchor Base
Bellow Material
Drain Port
End Connections
Lifting Lugs
Pipe/Shell
150 PSIG or 300 PSIG None. Can be ordered Single ply or multiply 304SS Carbon steel with tapered plug Fixed 150# or 300# flanges ANSI B 16.5, or beveled weld ends Used on all units Carbon steel Sch Standard

Series EP Externally Pressurized Expansion Joints are used in straight runs of pipe to accommodate large amounts of thermal expansion. The Series EP dual expansion joints utilize two sets of bellows with a center anchor base, effectively doubling the axial motion capability of a single expansion joint. Dual units are rated for either 8”, 12”, or 16” of axial travel. Anchor base is stanadard.

Select either 150 PSIG or 300 PSIG bellows construction. Single bellows styles are available for 4″, 6″, or 8″ of axial travel. Flanges or weld end are additional options.

Pipe Alignment Guides

Pipe Alignment Guides

Series PG Pipe Alignment Guides

Series PG Pipe Alignment Guides should always be used in conjunction with expansion joints. Pipe alignment guides help to control the motion of pipe and expansion joints, insuring that the joint is subject only to the deflection for which it was designed. Unguided piping, under pressure will tend to buckle, sometimes severely. This buckling would deter the expansion joints from working properly. Guides permit unobstructed axial movement of the pipe while restricting lateral, angular, or buckling movements.

 

Standard spider guides are manufactured to accommodate specific amounts of movement and insulation. A pipe guide assembly consists of an anchored housing and a sliding spider that is attached to the pipe. The spider moves through the housing as the pipe expands and contracts. Guides are carbon steel painted for rust protection. Additional items in this series include pre-insulated guides, pipe slides and bases, anchor clamps, baseboard fin-tube guides, baseboard anchors, and hinged series.

Sizes
Material
For Piping Styles
To Accommodate Insulation Thicknesses
To Accommodate Thermal Growth
Motion Capability
Provision For Copper Pipe
Provision For Insulation
1/2″ through 24″ Carbon steel. Painted for rust protection Steel, stainless steel, copper (requires dialectric spacer) 1″ to 4″ 3″ to 12″ (Depending on size and style) 3″ to 12″ (Depending on pipe size and body style) Specify dialectric spacer Gap between outer body and spider varies so that user can pack with insulation. Specify 1, 1-1/2, 2, 2-1/2, 3, 3-1/2, or 4

PTFE Bellows Connectors

Tef-Flex Convoluted PTFE Bellows

Tef-Flex Style 112A and 113A Convoluted PTFE Flexible Couplings and Bellows Expansion Joints offer the best combination of low spring-rate flexibility, temperature resistance, and the chemical inert properties of PTFE material. The “Tef-Flex” Style 112A 2-Convolute Flexible Coupling, and Style 113A 3-Convolute Expansion Joint were designed to meet the needs of the HVAC, high-technology, and chemical/petrochemical industries.

The construction of the “Tef-Flex” connector utilizes 2, 3, or even 5 molded convolutions of white PTFE. These convolutions are reinforced with metallic rings between the bellows for pressure rating and stability. Standard galvanized ductile iron backing flanges are protected by the lip of the PTFE bellows, so that all wetted surfaces are PTFE. Steel limit rods are factory installed. Additional convolutions provide greater movement capability. Style 112(316)A and 113(316)A include Type 316 stainless steel backing flanges and hardware. Options include high purity cleaning and packaging. “Tef-Flex” expansion joints can also be manufactured in machined, accordion style.

The “Tef-Flex” bellows connectors are versatile and will:

  • absorb pipe movements and stress;
  • isolate mechanical vibration;
  • reduce system noise;
  • protect against surge forces.

“Tef-Flex” connectors are suitable for connection to metallic piping or plastic lined metallic piping.

Sizes
Bellows Material
Flange Material
Rod Material
Working Pressure (PSIG)
Flange Pattern
Allowable Movements
Options
1-1/2” to 12″ PTFE (all wetted surfaces) Galvanized ductile iron Plated carbon steel

52 to 190

(Varies by temperature & size)

ANSI Standard

150# Drilling

Axial, Angular, and Lateral Offset 316 SS hardware, high-purity cleaning

“Tef-Flex” Style 112A 2-Convolute Flexible Coupling

Tef-Flex Style 112A Convoluted PTFE Bellows Flexible Couplings offer the best combination of low spring-rate flexibility, temperature resistance, and the chemical inert properties of PTFE material. The “Tef-Flex” Style 112A 2-Convolute Flexible Coupling were designed to meet the needs of the HVAC, high-technology, and chemical/petrochemical industries. The “Tef-Flex” bellows connectors are versatile and will 1) absorb pipe movements and stress; 2) isolate mechanical vibration; 3) reduce system noise; 4) protect against surge forces. “Tef-Flex” connectors are suitable for connection to metallic piping or plastic lined metallic piping.

The construction of the “Tef-Flex” connector utilizes two molded convolutions of white PTFE. These convolutions are reinforced with metallic rings between the bellows for pressure rating and stability. Standard galvanized ductile iron backing flanges are protected by the lip of the PTFE bellows, so that all wetted surfaces are PTFE. Steel limit rods are factory installed. Style 112(316)A include Type 316 stainless steel backing flanges and hardware. Options include high purity cleaning and packaging.

 Sizes
 Bellows Material
 Flange Material
Rod Material
Working Pressure (PSIG)
Max. Travel (In)
Max. Misalignment (In)
Options

1”

 Thru

12″

PTFE (all wetted surfaces) Galvanized ductile iron Plated carbon steel 150 to 190

(Varies by temperature)

1/4” to 1/2″ Depending on size 1/8” to 1/4″ Depending on size 316 SS hardware, high-purity cleaning

“Tef-Flex” Style 113A 3-Convolute Expansion Joint

Tef-Flex Style 113A Convoluted PTFE Bellows Expansion Joints offer the best combination of low spring-rate flexibility, temperature resistance, and the chemical inert properties of PTFE material. The “Tef-Flex” Style 113A 3-Convolute Expansion Joints were designed to meet the needs of the HVAC, high-technology, and chemical/petrochemical industries. The “Tef-Flex” bellows connectors are versatile and will 1) absorb pipe movements and stress; 2) isolate mechanical vibration; 3) reduce system noise; 4) protect against surge forces. “Tef-Flex” connectors are suitable for connection to metallic piping or plastic lined metallic piping.

The construction of the 113A “Tef-Flex” connector utilizes two molded convolutions of white PTFE. These convolutions are reinforced with metallic rings between the bellows for pressure rating and stability. Standard galvanized ductile iron backing flanges are protected by the lip of the PTFE bellows, so that all wetted surfaces are PTFE. Steel limit rods are factory installed. Additional convolutions provide greater movement capability. Style 113(316)A include Type 316 stainless steel backing flanges and hardware. Options include high purity cleaning and packaging. “Tef-Flex.”

 Sizes
 Bellows Material
 Flange Material
Rod Material
Working Pressure (PSIG)
Max. Travel (In)
Max. Misalignment (In)
Options

1”

 Thru

12″

PTFE (all wetted surfaces) Galvanized ductile iron Plated carbon steel 150 to 190

(Varies by temperature)

1/2” to 1-1/8″ Depending on size 1/4” to 5/8″ Depending on size 316 SS hardware, high-purity cleaning

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