The fault of the solenoid valve will directly affect the action of the switching valve and the regulating valve. Common faults are that the solenoid valve does not move and should be investigated from the following aspects:
(1) The solenoid valve lug looses or the wire end falls off. The solenoid valve must not be electrically charged. The lug can be tightened.
(2) The solenoid coil is burned out. The solenoid valve connection can be removed and measured with a multimeter. If the circuit is opened, the solenoid valve coil is burned out. The reason is that the coil is damp, causing poor insulation and magnetic flux leakage, resulting in excessive current in the coil and burning, so prevent rainwater from entering the solenoid valve . In addition, the spring is too hard, the reaction force is too large, the number of turns of the coil is too small, and the suction is insufficient to make the coil burn out. In emergency handling, the manual button on the coil can be switched from the “0†position to the “1†position during normal operation so that the valve opens.
(3) The solenoid valve is stuck. The clearance between the sliding valve sleeve and the valve core of the electromagnetic valve is very small (less than 0.008mm). It is generally a one-piece assembly. When there are mechanical impurities or too little lubricant, it is easy to get stuck. The treatment method can use steel wire to invade from the head hole to make it rebound. The fundamental solution is to remove the solenoid valve , remove the valve plug and the valve plug sleeve, and clean it with CCI4 to make the valve plug flexible in the valve sleeve. When disassembling, attention should be paid to the assembly sequence of the components and the external wiring positions so that the assembly and wiring can be performed correctly. In addition, the oil spray hole of the oil sprayer should be checked to see if the oil is sufficient.
(4) leak. Leakage can cause insufficient air pressure, making it difficult to open and close a forced valve due to damage to the gasket or sliding valve wear resulting in several cavities.
When dealing with the malfunction of the electro- magnetic valve of the switching system, an appropriate timing should be selected. When the solenoid valve is de -energized, it is processed. If the processing cannot be completed within a switching gap, the switching system can be suspended and handled with ease.
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