Common failures of solenoid valves

(1) The terminal of the solenoid valve is loose or the thread is loose, the solenoid valve must not be powered, and the thread can be tightened.


(2) The solenoid valve coil is burnt out. The wiring of the solenoid valve can be removed and measured with a multimeter. If it is open, the solenoid valve coil is burnt out.


The reason is that the coil is damp, causing poor insulation and magnetic leakage, causing the current in the coil to be too large and burning, so it is necessary to prevent rain from entering the solenoid valve.


During emergency treatment, the manual button on the coil can be turned from 0 to 1 in normal operation, so that the valve opens. In addition, the spring is too hard, the reaction force is too large, the coil turns are too few, and the coil can be burned if the suction force is insufficient. .


(3) The solenoid valve is stuck. The matching clearance of the spool of the solenoid valve to the spool is very small, and it is generally assembled in one piece. When mechanical impurities enter or the lubricant is too little, it is easy to get stuck. The basic solution of the treatment method with steel wire is to remove the solenoid valve, take out the valve core and valve core sleeve, and clean it with CC14 to make the valve core move flexibly in the valve sleeve. When disassembling, pay attention to the assembly sequence and external wiring position of the components, the brake is reassembled and the wiring is correct, and also check whether the oil spray hole of the lubricator can be replaced and whether the lubricating oil is sufficient.


(4) Air leakage. Air leakage will cause insufficient air pressure, making it difficult to open and close the forced valve. The reason is that the sealing gasket is damaged or the slide valve is worn, causing several blow-by gases.