1. Definition: Compound universal hinge expansion joint double gimbal expansion joint
A compound universal hinged expansion joint is composed of two bellows, a cross pin, a hinge plate, and a vertical plate connected by the middle pipe, which absorbs the lateral displacement in any plane and can bear the expansion joint of the bellows pressure thrust.
Two, connection form: there are two types of connection: welding connection and flange connection.
Three. Model identification:
Four. Materials for corrugated pipes should be selected according to working conditions, external environment and working temperature. The commonly used bellows are given in the lower table.
The materials listed in the above table should be solid solution treatment states. For austenitic stainless steel plates selected according to GB/T4237, the surface quality should meet the requirements of the above table group. For austenitic stainless steel plates selected according to GB/T3280, the surface processing should conform to No.2D or No.2B surface processing requirements.
Five. Compression tube joint
The material used for the pressure vessel of the expansion joint, such as the end pipe, the middle pipe, the flange pipe and so on, should be the same as or similar to the pipe material in the pipe with the expansion joint.
The material used to bear the pressure and thrust of the bellows, such as the pull rod, the hinge plate, the Wan Xianghuan, the pin shaft and the attachment accessories, should be properly selected according to the working conditions.