Rubber expansion joint, as it’s name, is mainly composed of rubber. It has various kinds of styles, and today I’m gonna to introduce one type, the “Double sphere” one.
- First of all, about the structure.
Double ball rubber expansion joint is composed of two flanges and one double ball rubber expansion joint. It is a joint composed of an inner rubber layer, a reinforcing layer with multiple layers of squeegee nylon cord fabric, and a rubber tube compounded by an outer rubber layer. The pictures are as follow.
- Secondly, about the material.
The rubber part is usually be EPDM, but NBR, NR, SBR and Neoprene are also common rubber materials. About the flange material, it commonly be CS, SS, CS zinc plated, galvanized, epoxy coated, CS epoxy resin coating and so on.
- Third,about function and application.
The rubber expansion joint is an “expert” on shock absorbtion. It has large displacement compensation ability, can compensate for axial, lateral and angular displacement, reduce noise, reduce vibration and certain anti-corrosion ability.
Rubber-like expansion joints have a large displacement compensation ability, can compensate for axial, lateral and angular displacements, reduce noise, reduce vibration and certain anti-corrosion capabilities. It has the characteristics of high pressure resistance, good elasticity, large displacement, good vibration absorption and noise reduction, and easy installation. It can be widely used in water supply and drainage, HVAC, fire protection, compressors, papermaking, pharmaceuticals, ships, pumps, fans and other pipelines. system.
- Fourth, about the working principle.
The expansion joint is a flexible structure arranged on the container shell or pipeline in order to compensate for the additional stress caused by temperature difference and mechanical vibration. Use the effective expansion and contraction deformation of the bellows of its main body to absorb the dimensional changes of pipelines, conduits, containers, etc. caused by thermal expansion and contraction, or to compensate for the axial, lateral and angular displacements of pipelines, conduits, containers, etc. It can also be used for noise reduction and vibration reduction and heating. In order to prevent the deformation or damage of the pipeline due to thermal elongation or temperature stress when the heating pipeline is heated, it is necessary to set a compensator on the pipeline to compensate for the thermal elongation of the pipeline. Thereby reducing the stress of the pipe wall and the force acting on the valve member or the support structure.
- Last but not least, the advantage.
Rubber expansion joints provide ultra-high performance, reliability, and longevity, thereby improving plant safety and the mechanical integrity of equipment. Thanks to the insertion of specially designed products in rigid piping systems, rubber expansion joints are able to:
1.reduce displacement
2.Improve thermal stability
3.Relief of system strain due to thermal changes, load stress, pump pressure fluctuations, sediment wear
4.reduce mechanical noise
5.Compensate for eccentricity
6.Eliminate electrolysis between dissimilar metals.
Post time: Jun-17-2022
