Metal expansion joint

Metal expansion joint (also called compensator) is compensating elements for thermal expansion and relative movement in pipelines, containers and machines.

Universal coupling
Flange adapter
Double flanged expansion joint
Spherical joint
The Right Metal Expansion Joint for Your Needs

For demanding pipe and ducting applications that encounter high pressures, high temperatures, and/or harsh chemicals, metal expansion joints are the safest and most dependable solution.

High pressure, high temperature media and harsh and/or corrosive chemicals demand safe, reliable, and leak-free joints between pipe or duct sections. But, because no piping or ductwork system is perfectly designed, and because movement and vibration can’t be avoided in most (if not all) applications, you need a way to accommodate for these factors without damaging your system.

That’s where our metal expansion joints come in. While they don’t offer as much flexibility as rubber or elastomer expansion joints, metal expansion joints are better suited to challenging applications and hazardous media.

Please keep these questions in mind when specifying the metal expansion joints you need:

Universal expansion joint

Universal expansion joint consists of two bellows connected with intermediate pipe. This expansion joint installed in exhaust systems absorbs axial and lateral heat expansions, vibrations and pressure movements. Universal expansion joints are unrestrained and they have applications in low pressure systems.

Universal expansion joints consist of two bellows with a central piece of pipe – this can be supplied with flanges or pipe ends. These joints are designed to absorb a greater amount of axial and lateral movements compared to a single expansion joint. The longer the central pipe length increases the greater the bellows can absorb lateral deflection.

Universal expansion joint with flanges

Universal expansion joint with flanges

Universal expansion joint with pipe ends

Universal expansion joint with pipe ends

The universal expansion joint can absorb not only axial movements but angular and lateral movements as well. It consists of two metal bellows with an intermediate pipe and connectors on both sides.

As a special form of the axial expansion joint, the universal expansion joint has only a limited pressure resistance for stability reasons and, moreover, loads the adjacent pipe supports with the axial compressive force resulting from the internal pressure.

The universal metal expansion joints are usually used to compensate large axial and lateral movements at low pressure.

A universal expansion joint is composed of two bellows connected by a common pipe or centerspool. This type of assembly allows any combination of the three basic movements: axial, lateral and angular. A universal expansion joint is generally used In cases with more lateral movement than can be absorbed by a single axial expansion joint, or when there is a limitation on the amount ot lateral forces allowed by the connecting pipe system. The lateral movement capability of e universal expansion joint depends on the centorspoollength. When using a universal expansion joint, anchors must be sufllclently designed to withstand the full thrust forces .

Tied Universal Expansion Joints

Typically, ln higher pressure applications there is a limit of the forces that the connecting pipe system can accommodate. tn these cases a tied universal expansion joint may be used. r~e rods restrain pressure thrust forces while allowing a large amount of lateral movement. The amount of lateral movement absorbed es with a universal expansion joint without tie rods depends on the centerspool length. The tie rods do not allow the expansion joint to absorb any axial extension external to the tied length. Ills Important that the piping configuration does not allow the tied universal expansion folnl to be compressed. This would relieve the tie rod tension, therefore, allowing pressure thrust forces to act on the piping system.

Tied Universal Expansion Joint Applications

Tied universal expansion joints are frequently used to absorb lateral deflection in a “Z” bend configuration. The expansion joint absorbs the thermal movement ol horizontal pipelines as lateral defleclion. This can be accomplished in a single plane or three plane configuration. In a three plane “Z ” bend the horizontal pipes may lie at any angle in the horizontal plane since the tied universal expansion joint can absorb lateral deflection in any direction.

Connection datas of reinforced ss metal expansion joints
Nominal diameter (mm) Quantity of ripple Pressure level Effective area of corrugated tube(cm2)

Maximum external diameter
(mm)

0.25 0.6 1.0 1.6 2.5

Axial compensation
(mm)

Stiffness

(N/mm)

Axial compensation
(mm)

Length(mm)

Toughness
(N/mm)

32 8 25/21 22/26 20/26 18/63   16 225
32 16 50/11 46/14 41/14 36/32   16 225
40 8 25/28 22/44 20/44 18/89 15/98 23 244
40 16 50/14 46/22 41/22 36/45 31/47 23 244
50 8 25/30 22/51 20/70 18/70 15/106 37 259
50 16 50/16 46/26 41/35 36/35 31/55 37 259
65 8 33/28 30/35 26/44 22/55 15/138 55 270
65 12 42/16 38/22 38/32 34/40 31/70 55 270
80 8 40/20 36/26 34/33 28/41 19/68 81 284
80 10 53/14 49/17 49/21 43/26 29/50 81 284
100 6 45/47 45/60 40/75 35/93 25/54 121 304
100 10 76/26 74/32 64/40 57/50 38/33 121 304
125 5 48/38 42/47 38/59 34/74 29/117 180 334
125 9 85/23 77/29 66/36 58/45 49/63 180 334
150 5 49/42 44/50 40/62 34/78 29/92 257 364
150 8 79/34 71/43 64/51 54/59 50/56 257 364
200 4 52/49 46/55 42/68 38/78 29/97 479 442
200 6 73/31 65/44 59/52 53/58 46/65 479 442
250 4 72/30 65/34 59/42 52/45 34/111 769 507
250 6 108/16 97/21 87/35 79/39 48/78 769 507
300 4 72/51 65/55 59/59 52/65 47/55 1105 562
300 6 108/32 97/35 87/37 79/41 71/47 1105 562
350 4 72/58 65/62 59/67 52/74 47/71 1307 622
350 6 108/38 87/41 87/44 79/48 71/45 1307 622
400 4 72/54 65/68 59/62 52/68 47/81 1611 700
400 6 108/36 97/39 87/43 79/47 71/47 1611 700
450 4 108/32 97/35 87/37 79/41 47/75 1972 760
450 6 162/20 145/22 131/23 118/25 71/52 1972 760
500 4 108/59 97/64 87/68 79/75 71/45 2445 835
500 6 162/34 145/37 131/39 118/43 106/28 2445 835
600 4 108/74 97/80 87/85 79/94 71/82 3534 980
600 6 162/42 145/45 131/49 118/53 106/48 3534 980
700 4 108/67 97/72 87/77 79/85 71/103 4717 1110
700 6 162/42 145/45 131/49 118/53 106/60 4717 1110
800 4 120/88 108/95 102/102 94/112 71/95 5822 1265
800 6 183/67 164/72 156/77 144/85 106/60 5822 1265
900 4 120/84 108/90 102/97 94/107 82/123 7620 1186
900 6 183/60 164/65 156/69 144/76 125/93 7620 1186
1000 4 120/91 108/98 102/105 94/116 82/117 9043 1286
1000 6 183/59 164/65 156/71 144/81 125/84 9043 1286

Datas above are only for reference, pls contact us for exact datas and price!    

Packaging & Shipping

Inner package of bellow expansion joint

plastic bag + carton cases one pcs/box

Outer package of bellow expansion joint

wooden cases


Fitting specification, Standard and identification

There are different varieties of pipe fittings made of various materials and available in various shapes and sizes.



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