Enter the electrical signal, the pilot head does not move, the diaphragm does not move, the valve does not work. Unacceptable line; voltage is too low; due to improper installation on the site, so that the first column stuck stuck. Input electrical signals, the pilot head column beating in place, the electromagnetic pulse valve can not be injected. Unloading hole blocking the exhaust is poor, the first column moving the first card phenomenon. Enter the electrical signal, the diaphragm beating in place, the pulse valve can not be injected. Pilot column moving beating, large diaphragm damping hole wear becomes larger, the damping effect becomes smaller; small diaphragm damping hole is blocked, unloading exhaust poor. The signal disappears, the pilot head can not be reset column. Burr or impurities, so moving column stuck; spring fatigue, lack of elasticity; damping hole is blocked, the pressure of the gas too hard or low pressure. The signal disappears, the diaphragm can not be reset off. Damping holes are blocked, the damping effect is too large, the pressure gas can not be in place in time; low static pressure; unloading hole closed not timely. The signal disappears, the diaphragm can not be reset and closed. Damping hole blocked; unloading hole is not blocked. Pilot valve coil fever, burn. High voltage; Determine DC24V voltage, input AC220V voltage so that the current is too large. Pressure above 0.5MPa, the diaphragm can not be opened. Damping hole wear becomes larger. Pressure below 0.4MPa, the diaphragm off. Damping holes are blocked; static pressure becomes smaller. Enter the electrical signal, the diaphragm can not open, the valve can not blow. Pilot valve does not work; small diaphragm damping hole, unloading hole blocked. In any state, the electromagnetic pulse valve can not shut down, a longitudinal gas. Valve may import and export direction reversed