The main reason for the pneumatic valve leakage and the solution ( 3)

do not allow the hammer impact pneumatic valve, cast iron and non-metallic. Pneumatic valve push put heavy is prohibited. Large diameter pneumatic valve device should be stand.
a pneumatic valve, pneumatic valve body and cover the leak reason:
pneumatic valve body and valve cover on the body has the defects such as sand holes, loose organization and slag. The cast iron casting quality is not high.
。 Days freezing crack;
there is a slag, not welding,. Bad welding. Stress crack defects such as;
。 Pneumatic valves are heavy cast iron after a crash damage.
2, maintenance methods of pneumatic valve body and bonnet:
the machine in accordance with the provisions of strength test; 。 Improve the quality of casting.
should be insulation or hot,. To temperature under ° and ° pneumatic valves. Stop using the pneumatic valves should be ruled out water.
should be performed in accordance with relevant welding procedures,. Pneumatic valve body composed of welding and weld pneumatic valve cover. Also should carry on the inspection and after welding strength test;