Causes of Solenoid Valve Failure

The failure of the solenoid valve will directly affect the action of the switching valve and the regulating valve. Common failures include the failure of the solenoid valve, which should be checked from the following aspects:

(1) If the solenoid valve connector is loose or the connector falls off, the solenoid valve shall not be energized and the connector can be fastened.

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

The reason is that the coil is damped, which causes poor insulation and magnetic leakage, causing excessive current in the coil and burning. Therefore, it is necessary to prevent rainwater from entering the solenoid valve. In addition, if the spring is too hard, the reaction force is too large, the coil turns are too few, and the suction is not enough, the coil can also be burned. During emergency treatment, the manual button on the coil can be turned from the "0" position to "1" position during normal operation to open the valve.

(3) The solenoid valve is stuck. The fit clearance between the slide valve sleeve and the valve core of the solenoid valve is very small (less than 0.008mm), which is usually assembled in a single piece. When mechanical impurities are brought in or lubricating oil is too little, it is easy to get stuck. The steel wire can be poked into the small hole of the head to make it bounce back. The fundamental solution is to remove the solenoid valve, take out the valve core and valve core sleeve, and clean them with CCI4 to make the valve core move flexibly in the valve sleeve. During disassembly, attention shall be paid to the assembly sequence and external wiring position of each component to facilitate correct reassembly and wiring. Also, check whether the oil atomizer injection hole is blocked 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 air blowby in several cavities.

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