The causes of pneumatic valve leakage

pneumatic valve leakage reasons:
one is pneumatic valve and pipe flange connection with the payment, due to the connection pad material, connecting bolts, and fitting materials under low temperature shrinkage of sync between relaxation and lead to leakage. So we put the pneumatic valve and pipeline connection from flange connection to the welding structure, to avoid the leakage in low temperature.

the other is the pneumatic valve stem and packing leakage. Generally most of the pneumatic valve packing using F, because it from sliding performance is good, small friction coefficient, F = friction coefficient of steel. ~。 ） , but also has the unique chemical stability, so widely used. But also have shortcomings, F is a cold flow tendency; Second, linear expansion coefficient is big, produce in the low temperature cold cause leakage, in a large number of ice, pneumatic valve stem failure to make the pneumatic valve is opened. Developed by low temperature adjustment for this pneumatic valve adopts the seal structure of the advantage of the characteristics of F large expansion coefficient, through to stay on the sidelines of achieve the goal of normal temperature, low temperature can be sealed.