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The main failure of the control valve components: ①valve body: to always check the valve body wall corrosion and wear, especially for corrosive media and high pressure differential, cavitation and other adverse conditions of the valve, you must ensure that the pressure Strength and corrosion resistance, wear resistance. ② spool: Because the valve spool to play the role of regulation and cut off the fluid is the closure of the activities of the device, so by the media erosion, corrosion, particle collision is the most serious, high pressure differential, cavitation more vulnerable to damage, so to check Whether its various parts damage, wear, corrosion, whether to repair or replacement. ③ seat: valve seat to ensure the closure of the valve is the key to closure, it is rotten by the rotten situation is more serious. And because of the media infiltration, so that the fixed valve seat thread surface often corroded and loose, to be a special inspection of this site. ④ Stem: To check the valve stem and spool, push rod connection loose, whether excessive deformation, cracks and corrosion. ⑤ packing: Check PTFE or other packing is aging, lack of oil, deterioration, packing is compressed. ⑥ gasket and O-ring: these fragile parts can not be cracked, aging.