Pneumatic valve leakage causes and maintenance

the cause of the pneumatic valve leakage and maintenance methods:
a pneumatic valve, pneumatic valve body and cover the leak reason:
: bad welding, there is a slag, no welding, stress crack defects, etc.
: cast iron casting quality is not high, pneumatic valve body and valve cover on the body has the defects such as sand holes, loose organization and slag.
. Pneumatic valves are heavy cast iron after a crash damage.
. Days freezing.
2, pneumatic valve body and valve cover maintenance methods:
. Pneumatic valve body and valve cover of welding the weld, shall be carried out according to relevant welding procedures, also should carry on the inspection after welding and strength test.
. Improve the quality of casting, in strict accordance with the provisions of strength test before installation.
. Pneumatic valves on push heavy objects, do not allow the hammer impact non-metallic pneumatic valve, cast iron and the installation of large diameter pneumatic valve should have support.
. To temperature under ° and ° pneumatic valve, should be insulated or hot, stop using the pneumatic valves should be ruled out water.