(2) grinding. Run after a certain period of time between the spool and the valve seat causing leakage can also cause internal leakage in the cylinder between the piston and the cylinder block, then grinding. The emery abrasive particle size should be appropriate grinding force should be uniform and the right hand-grinding, mechanical grinding, plating and casement. After grinding, polishing, and meet the required finish and accuracy requirements, meet the spool and the valve seat on the requirements, the need for sealing test after final assembly.
3 stuffing replace. Stuffing box should be replaced with the same type of stuffing, care should be taken to replace the filler tick, remove the filler properly to prevent damage to the valve stem. New stuffing box should be installed in accordance with the specification requirements, the incision should be dislocation, to prevent the valve stem threads scratch filler, filler pressing force should be uniform and appropriate, to prevent the cause of stress and increase the friction.electric solenoid valve
4 the replacement of the drive member. Control valve transmission parts and accessories if some of the wear parts replacement, repair. After the replacement and rehabilitation should be flexible transmission, the transmission gap as small as possible.
Pneumatic amplifier cleaning. Orifice is clogged due to the instrument with the compressed air in the dirt caused by the pneumatic amplifier response orifice cleaning, the appropriate wire can be used to dredge and cleaning. Back mounted amplifier diaphragm should even by force, to prevent the cause of blocked or leaking. Can adjust the gain of the amplifier by adjusting the pressing force of the steel ball to prevent resonance.
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