General procedure of pneumatic pneumatic valve repair

the pneumatic valve overhaul of general procedure:
dismantled, pneumatic valve, steel word for pneumatic valves are connected to the pneumatic valve and flange, good repair number, and record the working medium of the pneumatic valve, working pressure and working temperature, choose corresponding material to repair.
the pneumatic valve, overhaul, asked in a clean environment. First clear the external surface of the pneumatic valve, or with compressed air or clean with kerosene. But to recognize nameplate and other marks. Check the appearance of damage and record. Each other and then remove the pneumatic valve parts, clean with kerosene ( Don't use gasoline cleansing, lest cause fire) , check the other parts of damage, and record.
and strength test of pneumatic valve pneumatic valve cover. Such as high pressure pneumatic valve, but also for nondestructive flaw detection, such as ultrasonic testing, X-ray flaw detection.
and the sealing ring can examine the red lead powder, pneumatic valve seat, disc, Pneumatic valve handle) The alignment. Check whether pneumatic valve rod bending, ever corrosion, thread wear. Check the pneumatic valve stem nut wear degree.
and problems to the inspection for processing. Pneumatic valve repair welding defects. Welding or update the sealing ring. Alignment or replace the pneumatic valve stem. Everything should be for the other parts of the repair; Can't repair the replacement.
, reassemble the pneumatic valve. Assembly, gasket, packing to replace all.
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