Pneumatic valve closed off cause leakage

causes:
and bad operation, make close a jammed or over top dead center, joint damage fracture;
, closing a connection is not strong, slow down and fall off;
, choose fitting material is wrong, can't afford to medium corrosion and mechanical wear and tear. Prevention and elimination method:

and correct operation, close the pneumatic valve don't too hard, cannot exceed top dead center, open the pneumatic valve pneumatic valve is fully open, the handwheel should reverse a little;
and shut down parts and pneumatic valve stem connection should be solid, threaded joints should be check the product;
and shut down parts and pneumatic valve rod connected with fasteners should withstand the corrosion of medium, and has certain mechanical strength and wear resistance.