First, the product structure characteristics: 
 Such expansion joint bellows by a series of two or more together, the outside bellows bellows can guarantee not to move in the axial instability of the housing. This expansion joint can absorb large axial displacement. For a few more of these wave expansion joint, the cover is a protective device to ensure the expansion joints in the transportation or installation process does not damage the bellows. Moreover, they ensure the stability of the expansion joint work, but also because the presence of housing, the insulation for the expansion joint operation becomes easy. 
 Second, model: factory production DN32-800mm, the pressure level of 0.1 ~ 2.5MPa. 
 Third, the connection: 1, flanged type 2, take over the connection type 
 Fourth, the product of axial compensation: 30 to 450mm