Pneumatic diaphragm regulating pneumatic valve leakage of the two main reasons

and packing parts and pneumatic valve seal leakage
( ） Packing cover didn't pressure, pressing; Ptfe packing has been aging, deterioration.
（ ） Graphite asbestos packing oil stem node.
（ ） Gasket corrosion cause deformation or damage. Parts cleaning need to pay attention to matters of the parts cleaning needs attention
pneumatic diaphragm regulating pneumatic valve full close leak when major
( ） Pneumatic valve core corrosion, wear and tear.
（ ） Pneumatic valve seat of the outer ring threaded corrosion.