Pliant Bellows

Hadapsar, Pune, Maharashtra

Pliant Bellows is one of the top manufacturers of Metallic Expansion Joints in India. We are the experts of Flexible Piping Systems. To provide the best quality pipe expansion joints, we have implemented the ISO-9001 certified design, manufacturing, and testing facility equipped with the latest technology and our bellows are designed strictly according to EJMA 2009 design guidelines.

We offer a broad range of flexible metal bellow expansion joints to cater significant share of industries with a wide variety of applications. Pliant Bellows believe that our strong faith in client feedback coupled with our relentless commitment towards the highest possible product quality standards makes our metallic bellows expansion joints such a success.

Behind this achievement is a team of dedicated engineers and visionaries with expertise in all type of expansion metal bellows. Our team boasts of an extensive background in design, engineering and producing expansion bellows for pipes, axial and lateral compensators, hoses and non-metallic expansion joints like fabric bellow and rubber expansion joints. Hence, specific application demands have and will never be a challenge for us at Pliant Bellows.

We provide bellow compensator aka Metal bellow expansion joint for a broad variety of applications, such as Expansion joint in heat exchangers which act as a thermal compensator, Valve bellows for bellow seal gate valve or bellow seal globe valve which is used for sealing application, etc. We also provide a broad range of Metallic Bellow Coupling for torque transmission applications with zero backlash and high torsional rigidity. Our customers have highly rated our bending beam bellow load cell used for weighing applications for its precision outputs.

Our commitment to quality of expansion joint, pipe expansion and metal bellows starts at the quotation stage. The products are produced using software designed by our skilled engineers using extensive field research and then tested in our in-house testing facilities before delivery. To reduce human based errors majority share of our work, right from costing to bellow design and calculations have been automated which are developed and maintained in-house by our engineers.

This sort of extension joints are the least difficult and most practical joint. It is utilized where little warm developments exist. The prime point of preference of pivotal extension metal bellows is, the bearing of the stream is bidirectional alongside their minimal size. These bellows are generally made in SS304L, SS316L, SS316Ti and SS321. If there should arise an occurrence of extraordinary prerequisites they can be made in Inconel and other nickel based combinations.

Axial expansion metal bellows should be installed co-axially with the pipes centerline. The purpose of this bellows is to compensate axial movements. With the existence of axial movements desired cyclic life can be achieved. If incase there exist other movements like angular or lateral this will affect the cyclic life of Bellows. Generally there expansion joints are used between straight pipes where movement is parallel to the centerline of pipe line.

• Movement compensation is in straight line.
• Minute lateral/Angular movement can be adjusted but will affect the cyclic life of the expansion joint.
• Bellows are not designed to absorb rotary movements.
• Due to the line pressure between the piping systems numbers of expansion joints are required.
• The best piping system is the once which is broken between intermediate stages with metal bellows at each stage

In case if the expansion/contraction rate is higher than the bellows capacity 2 Bellows with a center foot in between can be used. There 2 bellows are placed between the center of the pipes so that the axial movements from each ends of pipe can be absorbed by the respective bellows. One should note in case of cryogenic application the pipe expansion joint will be stretched as the piping system will contract.

Lateral expansion joints refer to the direction perpendicular to the center line of the pipe expansion joint. Lateral deflection is also called as PARALLEL OFFSET and TRANSVERCE. The lateral expansion joint are also known as Tied Lateral expansion joints or Tied universal expansion joints.

Incase of absorbing large amount of Lateral deflections universal expansion joints 2 bellows are connected by a center spool (piece of pipe) and the tie rods are then attached on the outer ends for maximum deflection absorption. The length of center spool (center piece) plays a major role. In case the weight of center spool is significant it is supported by lugs. The benefit of the Tied universal expansion joint is it can be used in place where the piping joints are not in one place

When the angular movement is only in one plane hinge or angular expansion joints are used. An angular expansion can be expressed when an expansion joint experience bending about its center which is the centerline and half way between the ends of metal bellows.

These types of bellows are used mostly in sets wherever piping direction changes. So you will find hinged joints used at the locations where pipe bending occurs. Due to the hinged nature of this bellow only angular movement is allowed around the hinges. Since lateral movements too take place so there is a piping joint between these 2 bellows. The amount of lateral deflection a hinged expansion joint can accommodate for a given angular movement is directly proportional to the distance between them. To use a pair of hinged bellows effectively the distance between them should be made as large as possible. When only two hinge joints are used as shown in the adjacent figure the piping perpendicular to the hinge segment must deflect to absorb the thermal expansion of the spool containing these angular expansion joints.

When the piping in a single plane system is not flexible enough to absorb the thermal expansion of the spool between the hinged joints a system of three hinged expansion joints may be used. In this system the combination of the three joints absorbs all the thermal expansion of the piping system and no deflection of the piping is observed. This system produces the lowest possible forces on the intermediate anchors and guides

If the thermal growth in the Piping System occurs in only one plane the use of this joint provides the most efficient solution to absorb the thermal deflections.

An Elbow Pressure Balanced Expansion Joint is designed to absorb externally imposed axial movement without imposing pressure loading on the system. This is accomplished by using two bellows both at line pressure tied together and acting in opposite directions. It is used where pressure loading on piping or equipment is not acceptable.

To move the joint itself is not balanced. Both the flow bellows and balancing bellows must be compressed or elongated in operation and the combined axial spring force acts on the piping or equipment. Since the forces needed to move the bellows of these joints are of low magnitude these are usually not objectionable.

These expansion joints are usually installed at change of direction. They may also be designed for in line operation. In case of single Elbow joints when it is subjected to both axial and lateral movements both the anchors at the end of the piping run and the one on the machine are intermediate anchors and only directional guiding is required. By proper design the guide directly above the equipment can be made to absorb the axial movement forces of the expansion joint without imposing these on the equipment. The only force imposed on the equipment is the force which is required to deflect the expansion joint.