According to the American standard EJMA and national standard GB/T12777/99,the wave height,distance,thickness,layer number of bellows are designed and optimized by computer.Its profile has " U " type," S " type," C " type," CU " type, " V "  type and so on.We can design and manufacture different bellows  expansion joint in the light of different application condition.

The characteristic of the circular metal bellows which is manufactured by hydraulic pressure,is precision of geometry size,uniformity of the material forming,small attenuation, no damage and good surface quality,so its life is enhanced greatly.

According to the use conditions,we can design and manufacture the monolayer and the multilayer bellows whose characteristic is low rigidity value,small elastic reaction and long life.

The material of bellows is different for the different medium,which is the characteristic of company.The characteristic of the main material ,including  carbon steel,SUS304,SUS321,SUS316L,SUS316,SUS310S,
SUS317J1,Incoloy800,Inconel625, B315,FN-2,C-276,alloy Cu,alloy Ti, alloy aluminum and  compound material and so on, is strong antisepsis and long life.
In order to guarantee the product quality we checking up the material of expansion joint, including analysing the chemical composition,examining the mechanics characteristic and the microstructure, 100% X - ray detecting the welded joint.