Rubber Expansion Joints, Rubber Bellows

Expansion Joints

we have specialised ourselves in making of expansion joints towards following applications.

  • Conveyor high temperature substances (like steam, gases etc…)
  • Conveyor of high pressure or high vacuum substances
  • To absorb movements
  • To absorb vibrations (anti vibrations)
  • Noise absorption
  • Earthquake movements
  • Shock absorption
  • VERY HARD 90-100°

This typical joints are made as bellows of stainless steels, PTFE, Hi modulus plastics, glass fibre fabrics (we have separate section), or specialised synthetic elastomers (rubbers). A bellows are designed with single or multiple convolutions depending on length and application, with the shape of the convolution designed to withstand the internal pressures of the pipe, and to ensure flexible enough to absorb lateral , axial, and angular deflections. The higher flexibility with zero leakage are also made with multiple layers. The rubber bellows are manufactured with steel wire & high strength fibre reinforcement. The flanges are made up according to standards or non-standards provided by customers. They are made in different shapes like round, Oval, Elliptical, Conical, rectangle or octagonal.

Pressure balanced expansion joints (bellows)

We have manufactured Expansion joints mainly for industrial piping systems to adapt movement or vibrations due to thermal and mechanical changes in the production line.And some of the process has wider changes in temperature hence metal components vary in size. Expansion joints with metal bellows are designed to absorb certain movements and minimize the conveying of forces to delicate components in the system.

In some of the application pumps built pressure or gravity is used to move fluids through the piping system. Fluids under pressure follow the volume of their vessels.So we designed the unique concept of pressure balanced expansion joints to maintain a constant volume by having balancing bellows compensate for volume changes in the bellows (line bellows) which is moved by the pipe.

Rubber expansion Joint bellows

Wrapping steel wire and fabric reinforced rubber masticated sheets

Rubber expansion joints are primarily manufactured by labour-intensive wrapping of rubber masticated sheets and fabric reinforced rubber sheets around a bellow-shaped product mandrel tool.Along with rubber and fabric, reinforced rubber and/or also steel wires or metal rings are inserted for additional reinforcement. This can be made high pressure resistant. After the entire product is build up on the mandrel, it is enclosed with a winding of (nylon) peel ply to coerce all layers together before pressurization and vulcanization. Because of the labor-intensive production process, it takes longer.

Moulded rubber expansion joints

Rubber expansion joints (some types only) can also be made with a moulding process. They are of medium sized expansion joints with bead rings, which are manufactured in large quantities on a cylindrical mandrel, which is wrapped with partiality cut fabric ply. This part is finally placed in a mould and moulded into shape and vulcanized. We manufacture for automobile sector for their bulk and faster needs.

Our next project is to adopt new technology for robotic manufacturing of Automated winding of rubber expansion joints.

Member Testimonials

ONGC – Oil and Natural Gas Corporation Limited

"ONGC - Oil and Natural Gas Corporation Limited" - Our complex drilling application where Shaft was eccentric and application was robust & muddy. Replacement was never easy. Mech Spares designed Oil seals resolved difficulty. This gave a complete joy to my maintenance team.
2014-06-08T07:48:57+00:00
“ONGC – Oil and Natural Gas Corporation Limited” – Our complex drilling application where Shaft was eccentric and application was robust & muddy. Replacement was never easy. Mech Spares designed Oil seals resolved difficulty. This gave a complete joy to my maintenance team.

Kuwait National Petroleum Company

"Mr Mohammed Al Duaigy" of (Kuwait National Petroleum Company) : We tried several diaphragms from renown worldwide Rubber manufacturing companies. We found Mech Spares technical know how and product to be of great durability and lasted 3 times more then anticipated. They have accurate understanding of there products.
2014-06-08T07:49:23+00:00
“Mr Mohammed Al Duaigy” of (Kuwait National Petroleum Company) : We tried several diaphragms from renown worldwide Rubber manufacturing companies. We found Mech Spares technical know how and product to be of great durability and lasted 3 times more then anticipated. They have accurate understanding of there products.

McCafferty BM Design Ltd, KENT United Kingdom

"McCafferty BM Design Ltd, KENT United Kingdom" - Most of the O rings manufacturing company suggested to use larger diameter and expensive elastomers. We learnt with Mech Spares that elastomer being weaker compare to metal and alloys and needs appropriate back up for high pressure or high vacuum applications. Further not necessary the most expensive elastomer is the best for all applications. We trust Mr Nilesh chodhari completely for all our O rings designing applications.
2014-06-08T07:50:26+00:00
“McCafferty BM Design Ltd, KENT United Kingdom” – Most of the O rings manufacturing company suggested to use larger diameter and expensive elastomers. We learnt with Mech Spares that elastomer being weaker compare to metal and alloys and needs appropriate back up for high pressure or high vacuum applications. Further not necessary the most expensive View Full →

Bhabha Atomic Research Centre ( BARC )

"Dr. A. Singh" of BARC: The electric Insulation mat manufactured by MECH SPARES as per IS 15624 tested at ERTL and found to withstand 40 Kv and still didn't tear. We have been using since 5 years and still didn't generate any fatigue. They arranged bulk delivery in short period.
2014-06-08T07:16:20+00:00
“Dr. A. Singh” of BARC: The electric Insulation mat manufactured by MECH SPARES as per IS 15624 tested at ERTL and found to withstand 40 Kv and still didn’t tear. We have been using since 5 years and still didn’t generate any fatigue. They arranged bulk delivery in short period.

Tata Steel

"Tata Steel" - One of our old machines started making loud noise and disturbed the entire village. We were compelled to stop the machines which lead to huge production loss. With the help of Mech Spares designed bellows in two part we could retain the lubrication and eliminate the noise.
2014-06-08T07:17:16+00:00
“Tata Steel” – One of our old machines started making loud noise and disturbed the entire village. We were compelled to stop the machines which lead to huge production loss. With the help of Mech Spares designed bellows in two part we could retain the lubrication and eliminate the noise.
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