Solenoid valve common fault introduction

The solenoid valve is composed of a solenoid and a magnetic core and is a valve body containing one or several holes. When the coil is energized or de-energized, the operation of the core will cause fluid to pass through the valve body or be severed to achieve the purpose of changing the direction of the fluid. The electromagnetic component of the solenoid valve is composed of a fixed iron core, a moving iron core, a coil and the like; the valve body portion is composed of a sliding valve core, a sliding valve sleeve, a spring base and the like. The solenoid is mounted directly on the valve body and the valve body is enclosed in a sealed tube to form a compact, compact combination. The solenoid valves we commonly use in production include two-position three-way, two-position four-way, and two-position five-way. Let me talk about the meaning of the two places: for the solenoid valve, it is charged and de-energized, and it is on and off for the valve to be controlled.
The failure of the solenoid valve will directly affect the action of the switching valve and the regulating valve. If the common fault has a solenoid valve that does not operate, it should be checked from the following aspects:
1. The solenoid valve terminal is loose or the wire ends are off. The solenoid valve is not allowed to be energized and the wire ends can be tightened.
2. The solenoid valve coil is burnt out. The wiring of the solenoid valve can be removed and measured with a multimeter. If the circuit is open, the solenoid valve coil is burnt out. The reason is that the coil is damp, causing poor insulation and magnetic leakage, causing the current in the coil to be too large and burning, so it is necessary to 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 force is insufficient to cause the coil to burn. For emergency handling, the manual button on the coil can be turned from the “0” position to the “1” position during normal operation, causing the valve to open.
3. The solenoid valve is stuck: the clearance between the sliding valve sleeve of the solenoid valve and the valve core is very small (less than 0.008 mm), and it is generally assembled in one piece. When mechanical impurities are brought in or the lubricating oil is too small, it is easy to get stuck. . The treatment method can use a steel wire to break in from the small hole of the head to make it bounce back. The fundamental solution is to remove the solenoid valve, take out the valve plug and the valve core sleeve, and clean it with CCI4, so that the valve core can move flexibly in the valve sleeve. When disassembling, pay attention to the assembly sequence of each component and the external wiring position, so as to reassemble and wire correctly, and check whether the oil mist injection hole is blocked and the lubricating oil is sufficient.
4. Air leakage: Air leakage will cause insufficient air pressure, which makes the forced valve open and close difficult. The reason is that the gasket is damaged or the spool is worn out, causing several cavity helium. When dealing with the solenoid valve failure of the switching system, the appropriate timing should be selected, and the solenoid valve should be processed when the power is lost. If the processing is not completed within one switching gap, the switching system can be suspended and taken care of.