Customized Natural EPDM Rubber Expansion Joint Rubber Compensator

Product Specification

China Factory customized natural Rubber Expansion Joint EPDM

1. Expansion joints(compensators)

• Introduction

Expansion joints are commonly referred to as compensators. They consist of one or more bellows (an elastic component) as the main working body, as well as connectors at both ends, supports, flanges, conduits, and other accessories. Expansion joints are a flexible structures installed on vessel shells or pipelines to compensate for additional stresses caused by temperature differences and mechanical vibrations. By utilizing the effective expansion and contraction of the bellows, they compensate dimensional changes in pipelines, conduits, vessels and so on, which are caused by thermal expansion and contraction, or compensate for axial, lateral, and angular displacements of pipelines, conduits, vessels, etc. They can also be used for noise and vibration reduction and heating supply systems. In order to prevent deformation or damage to heating pipelines caused by thermal expansion or temperature stress when the heating pipelines are heated, compensators need to be installed on the pipelines to compensate for thermal expansion of the pipelines, thereby reducing the stress on the pipeline walls and the forces exerting on valves or support structures.

As expansion joints are elastic compensating components capable of free expansion and contraction, they have the advantages of reliable operation, good performance, and compact structure,and others.Hence they are widely used in departments such as chemical engineering, metallurgy,nuclear energy,and the like. There are various forms of expansion joints used on vessels, with the U-shaped expansion joint being the most widely used in terms of the shape of bellows, followed by Ω-shaped and C-shaped joints. As for expansion joints used on pipelines, they are classified according to structural compensation into universal expansion joint, pressure balanced expansion joint, hinged expansion joint, and gimbal expansion joint.

• Classification

• Special materials

Super Austenitic Stainless Steel:254SMO,904L,AL6XN

Duplex Stainless Steel :2205 Dual phase steel (S31803)

Nickel Based Alloy Steel:INCOLOY800/800H/800HT/840/825,INCONEL600/601/690/625/X-750

Hastelloy Alloy C-276/C-22/X,MONEL400/K500

Pure Nickel:N4,N6(Ni200,Ni201)

Titanium Plate For Stamping:GR1,GR2,TA1,TA2

Austenitic Stainless Steel:SUS304,SUS304L,SUS316,SUS316L,SUS310S,SUS321,SUS316Ti

​

2. Rubber Expansion Joints

• Introduction:

Rubber expansion joints generally consist of smooth waveform compensation elements with rubber flanges at both ends and metal flanges. The metal flanges commonly adopt a loose tube construction. The surface of the waveform compensation element is rubber, and the inner layer consists of several layers of reinforced fiber or steel strip (wire) reinforced interlayer. The reinforced fiber or steel strip (wire) reinforced interlayer extends to the rubber flanges at both ends, and there is a hard steel wire skeleton inside the flanges. Rubber expansion joints have significant displacement compensation capabilities and can compensate for axial, lateral, and angular displacements. They also have the ability to reduce noise, decrease vibration, and provide certain corrosion resistance. With features such as high pressure resistance, good elasticity, large displacement, effective vibration absorption and noise reduction, and easy installation, they can be widely used in pipeline systems for water supply and drainage, HVAC, fire protection, compressors, papermaking, pharmaceuticals, ships, pumps, fans, etc.

Selection Instructions

• Flexible rubber joints selection instructions:

Rubber joints are generally suitable for temperature from -200°C to 70°C. The instantaneous temperature can reach 115°C, and the operating temperature is from 70°C to 115°C.For flange-connected rubber joints with high working pressure and temperature (diameter above 200, temperature above 70°C, working pressure above 1.5MPa), flange rubber joints with limited devices can be selected.

When installing flange-connected rubber joints, the bolts connecting the flanges should be threaded from the inside of the flanges to both ends of the flanges, intersecting with washers or spring washers. The bolts should be tightened diagonally step by step.

For rubber joints connected by the union swivel, the union swivel at both ends should not be swapped during installation to avoid product leakage or damage.

• Advantages:

Rubber expansion joints have ultra-high performance, reliability, and service life, thereby improving factory safety and mechanical integrity of equipment. By inserting specially designed products into rigid pipeline systems, rubber expansion joints can: reduce displacement/improve thermal stability/release thermal changes, load stress, pump pressure fluctuations, system strain caused by sediment wear/ reduce mechanical noise/ compensate for centrifugation/ eliminate electrolysis between different metals.