The operating torque of pneumatic butterfly valve varies with the opening and closing direction of the valve. For horizontal pneumatic butterfly valves, especially those with large diameters, the torque caused by the water depth and the head difference between the upper and lower parts of the valve shaft cannot be ignored.

The compensator has the following advantages:
1. Compensate the axial, transverse and angular thermal deformation of absorption pipe.
2. The expansion and contraction amount of the corrugated compensator is convenient for the installation and disassembly of the valve pipeline.
3. Absorb equipment vibration, and tetrafluoro compensator reduces the impact of equipment vibration on pipeline.
4. Absorb the deformation of pipeline caused by earthquake and ground subsidence.