Metal corrugated pipe pneumatic valve need to pay attention to the problem

the clearance between the pneumatic valve rod and a corrugated pipe, generally take to mm. B bellows can't bear the torque, the design should guarantee the bellows only tensile and compression. C corrugated pipe pneumatic valve is in open or closed, the bellows in the compression and tensile state respectively. D corrugated pipe should be under pressure to the minimum thickness of laminated, and test requirements. E attention to material compatible, practice proved inconel alloy bellows better material resistant to high temperature and high pressure. F corrugated pipe welding procedure qualification and welding quality records. G as corrugated pipe pneumatic valve of throttle velocity influence on corrugated pipe should be considered. H corrugated pipe has certain rigidity, should consider bellows stretching or compression caused by the increase of operating torque.