Common malfunctions solenoid valve

Common malfunctions
The solenoid valve is composed of a solenoid coil and a magnetic core. It is a valve body containing one or several holes. When the coil is energized or de-energized, the operation of the magnetic core will cause the fluid to pass through the valve body or be cut off to achieve the purpose of changing the direction of the fluid. The electromagnetic components of the solenoid valve are composed of fixed iron core, moving iron core, coil and other components; the valve body part is composed of slide valve core, slide valve sleeve, spring base, etc. The solenoid coil is installed directly on the valve body, which is enclosed in a sealed tube, forming a simple and compact combination. The solenoid valves we commonly use in production include two-position three-way, two-position four-way, two-position five-way, etc. Let's first talk about the meaning of the two bits: for the solenoid valve, it means electrification and de-energization, and for the controlled valve, it means on and off. The failure of the solenoid valve will directly affect the action of the switching valve and the regulating valve. A common failure is that the solenoid valve does not operate. It should be checked from the following aspects: 1. The solenoid valve terminal is loose or the thread has fallen off. The solenoid valve cannot be powered and can be tightened. Threads. 2. If the solenoid valve coil is burned out, you can remove the wiring of the solenoid valve and measure it with a multimeter. If it is open circuit, the solenoid valve coil is burned out. The reason is that the coil is damp, causing poor insulation and magnetic leakage, causing excessive current in the coil and burning. Therefore, rainwater must be prevented from entering the solenoid valve. In addition, if the spring is too hard, the reaction force is too large, the number of coil turns is too few, and the suction force is not enough, the coil may be burned. During emergency treatment, the manual button on the coil can be moved from the "0" position during normal operation to the "1" position to open the valve. 3. Solenoid valve stuck: The matching gap between the slide valve sleeve and the valve core of the solenoid valve is very small (less than 0.008mm). It is usually assembled in a single piece. When mechanical impurities are brought in or there is too little lubricating oil, it is easy to get stuck. . The treatment method can be to insert a steel wire through the small hole in the head to make it bounce back. The fundamental solution is to disassemble 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, attention should be paid to the assembly sequence of each component and the position of external wiring to ensure correct reassembly and wiring. Also 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, causing air leakage in several cavities. When dealing with the solenoid valve failure of the switching system, you should choose an appropriate time to deal with it when the solenoid valve is out of power. If the solution cannot be completed within a switching gap, the switching system can be suspended and the problem can be dealt with calmly.