Troubleshooting and treatment of common faults of solenoid valve of air compressor

Troubleshooting and treatment of common faults of solenoid valve of air compressor

Solenoid valve is one of the common air compressor accessories, which can be used to connect or cut off the air source in production, thereby switching the pneumatic control membrane head air circuit. The solenoid valve failure is also one of the common air compressor parts failure, so we need to master the common air compressor solenoid valve troubleshooting and handling methods.

Troubleshooting and treatment of common faults of solenoid valve of air compressor

　　The electromagnetic part of the solenoid valve is composed of fixed iron core, moving iron core, coil and other parts. The valve body part is composed of spool valve core, spool valve sleeve, spring base and so on. The solenoid coil is directly installed on the valve body, and the valve body is enclosed in a sealed tube, forming a simple and compact combination. Its basic working principle is: when power is applied, the electromagnetic coil generates electromagnetic force to lift the closing part from the valve seat, and the valve opens; when the power is off, the electromagnetic force disappears, the spring presses the closing part on the valve seat, and the valve closes.

　　 Air compressor solenoid valve failure

　　Common air compressor solenoid valve troubleshooting and treatment

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

　　 (2) The solenoid valve coil is burnt out, you can remove the wiring of the solenoid valve 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. For emergency treatment, you can turn the manual button on the coil from "0 position" to "1 position" during normal operation to open the valve.

　　 (3) The solenoid valve is stuck. The matching gap between the solenoid valve slide valve sleeve and the valve core is very small (less than 0.008mm), and it is generally a single-piece assembly. When there are mechanical impurities or too little lubricating oil, it is easy to get stuck. The treatment method can be made by inserting a steel wire through a small hole in the head to make it rebound. 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 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, which causes blow-by in several cavities. When dealing with the solenoid valve fault of the switching system, the appropriate time should be selected, and the solenoid valve should be dealt with when the solenoid valve is out of power. If the processing cannot be completed within a switching gap, the switching system can be suspended and handled calmly