ChangYuan Rubber Expansion Joint

Flexible rubber joint, abbreviated as rubber joint, is a joint made up of fabric reinforced rubber parts and flat movable joints, metal flanges or threaded pipe flanges, used for pipeline vibration isolation, noise reduction, and displacement compensation. It is a pipeline joint with high elasticity, high airtightness, medium resistance, and weather resistance.

Rubber expansion joints can be made of various materials according to their range of use. Rubber expansion joints also have advantages and disadvantages compared to metal expansion joints. Rubber expansion joints can absorb significant movement over a short distance. They provide motion in all directions, such as axial, angular, lateral, and torsional that may occur under external conditions. It can also reduce wind, impact loads, and seismic motion.

Application of Rubber Expansion Joint in Pipeline

Expansion joints are flexible structures installed on container shells or pipelines to compensate for additional stresses caused by temperature differences and mechanical vibrations. Use the effective expansion and deformation of the bellows of its working body to absorb the dimensional changes of pipelines, conduits, containers, etc.

Rubber expansion joints can also be used for noise reduction, vibration reduction, and heating. In order to prevent deformation or damage of the heating pipeline due to thermal elongation or temperature stress during heating, compensators need to be installed on the pipeline to compensate for the thermal elongation of the pipeline, thereby reducing the stress on the pipe wall and the force acting on the valve or support structure

Design of Rubber Expansion Joint

Changyuan Company produces rubber expansion joints according to the standards of the Fluid Sealing Association, using advanced ingredients and stamping equipment. Ensure that the rubber expansion joints produced have good ductility and scalability.

The professionals of Changyuan Company use computer software such as AutoCAD and finite element calculation to design the rubber expansion joint model required by the customer. Before production, the design drawings are submitted to the customer for confirmation.

CAD Design

Finite Element Analysis

Manufacturing process of Rubber expansion joints

The production of rubber joints is divided into the following steps: material selection, vulcanization, excavation and processing, assembly. In the production process of rubber joints, it is necessary to pay attention to factors such as material selection, vulcanization time, vulcanization temperature, etc. to ensure the performance and quality of rubber joints

Changyuan Company uses a fully automatic lathe to process the inner and outer diameters of flanges, as well as a fully automatic rubber winding machine to assemble the spheres of rubber expansion joints. Then, the quality of the rubber expansion joints is checked one by one manually.

Flange Forming

Rubber Joint Forming

Advantages of rubber expansion joints

Rubber expansion joints have ultra-high performance, reliability, and service life, thus improving factory safety and equipment mechanical integrity. Due to the insertion of specially designed products into rigid piping systems, rubber expansion joints can:

Reduce Displacement

The rubber expansion joint has a large displacement compensation ability, which can compensate for axial, lateral, and angular displacement.

Less Noise

The surface of the rubber expansion joint is made of rubber, and the inner layer is reinforced by several layers of strong fibers or steel strips (wires) to prevent noise during operation.

Improving Stability

Rubber expansion joints can reduce the stress on the pipe wall and improve the stability of the pipeline by exerting force on the valve or support structure.

Offset Eccentricity

When the pipeline is displaced due to temperature difference, the rubber expansion joint can compensate for the eccentric displacement between the pipelines.

Absorbed Stress