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Unick Control System being the leading Metallic Expansion Joint Manufacturer in India with ‘UNIK’ Brand has fulfilled all the qualification to manufacture a wide range of Metallic Expansion Joint for the most severe and demanding service of the Oil, Gas, Refinery, Chemical stell Plant and Power Plant Industries.
Material Type ASTM* Material Specification Temperature(C°)
304 S/S A-240 550
304L S/S** A-240 550
316 S/S A-240 550
316L S/S A-240 550
321 S/S A-240 550
Monel 400** B-127 425
Inconel 600 B-168 450
Inconel 625 B-443 450
Incoloy 800/800H** B-409 600/900
Incoloy 825** B-424 450
Hastelloy C 276** B-575 600
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Bellows and expansion joints are typically used to connect engines to silencers. They are ideal where space is limited, but strength is a consideraion to absorb heat, expansion and vibration. With standard size of 2″ – 30″, customisation of connections both length and material to meet stringent specifications.

Metallic Bellows


Rectangular Metal Expansion Joint
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Rectangular metals expansion joints are generally used to convey fumes from the boiler to the chimney or steam from the turbine to the condenser.
Single Expansion Bellows
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Most economical expansion joint, total installed system cost may be higher than Gimbal, Hinge or Tied Expansion Joint System.
Universal Expansion Bellows
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Economical expansion Joint. Absorbs large amount of lateral movement, total installed system cost may be higher than Gimbal, Hinge or Tied Expansion Joint System.
Tied Universal Expansion Bellows
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Absorbs large amount of lateral movement in any direction. Eliminates pressure thrust loads. Absorbs the thermal growth of the attachments. Piping between the rod.
Pressure Balanced Bellows
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Absorbs axial and lateral movements while still restraining pressure thrust. Eliminates main anchors, minimum guidance required.

Non-Metallic Bellows


Fabric Expansion Bellows
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Absorbs axial and lateral movements and isolate vibration. Sometimes they even makeup for minor misalignments. Eliminates main anchor, minimum guidance is required.