Common faults of solenoid valves

The fault of the solenoid valve will directly affect the action of the switching valve and the regulating valve. The common fault is that the solenoid valve does not operate, which should be investigated from the following aspects:

1. The solenoid valve terminal is loose or the thread is off, the solenoid valve must not be energized, and the thread can be tightened.

2. The solenoid valve coil is burnt out. You can remove the solenoid valve's wiring and measure with a multimeter. If it is open, the solenoid valve coil will burn out. The reason is that the coil is damp, causing 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 number of turns of the coil is too few, and the suction force is not enough to cause the coil to burn out. For emergency treatment, the manual button on the coil can be turned from the "0" position to the "1" position during normal operation to open the valve.

3. Solenoid valve jam: the matching clearance between the solenoid valve slide valve sleeve and the valve core is very small (less than 0.008mm), generally a single-piece assembly, when mechanical impurities are brought in or there is too little lubricating oil, it is easy to jam . The treatment method can be made by inserting a steel wire through a small hole in the head to make it spring back. The fundamental solution is to remove the solenoid valve, take out the valve core and valve core sleeve, and clean it with CCI4 to make the valve core move flexibly in the valve sleeve. When disassembling, pay attention to the assembly sequence of the components and the position of the external wiring, so that the reassembly and wiring are correct, and check whether the oil spray hole of the lubricator is blocked and whether the lubricant is sufficient.

4. Air leakage: Air leakage will cause insufficient air pressure, which makes it difficult to open and close the forced valve. The reason is that the sealing gasket is damaged or the slide valve is worn, which causes blow-by in several cavities. When dealing with the fault of the solenoid valve of the switching system, the appropriate time should be selected, and the solenoid valve should be dealt with when the solenoid valve is de-energized. If the processing cannot be completed within a switching gap, the switching system can be suspended and handled calmly.