PTFE compensator: 

1 connect the flange when there is no special requirement, according to HG45-91 PN1.0MPa standards. 2 large diameter compensator (DN>300mm), recommends the use of negative pressure-resistant. 

3 GM 3-wave, if you increase (lengthen) or non-standard products you can customize. 

4 compensator of length of structure, technical parameters table.