The function of the solenoid valve or magnetic valve is to regulate the compressed air pressure, flow rate and flow direction. Using the electromagnetic valve can form all kinds of pneumatic circuit, to enable pneumatic actuators work properly according to the design of the program. Electromagnetic valve Common fault is air leak , that is on the inlet side of the two exhaust have air leakage phenomenon, when the magnetic valve doesn’t doesn’t work (within standard pressure). Repair method is to the disintegration of solenoid valve, use clean diesel to wash all the parts, then dry the parts with a clean cotton yarn and make a small amount engine oil on the surface; You should make replacement if the piston rod badly worn or sealing ring damaged in the valve.