The solenoid valve is composed of an electromagnetic coil and a magnetic core. It is a valve body containing one or several holes. When the coil is energized or disconnected, the movement of the magnetic core will cause fluid to pass through the body or be cut off to change the direction of the fluid. The electromagnetic parts of the solenoid valve are composed of fixed iron core, moving iron core, coil and other components; The valve body part is composed of spool, spool sleeve, spring base, etc. The solenoid is mounted directly to the body, which is enclosed in a sealed tube, creating a concise, compact package. We commonly used in the production of solenoid valves have two three-way, two four-way, two five-way and so on. Here to talk about the meaning of two: for the solenoid valve is live and lose power, for the control of the valve is open and close.
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 work, which should be investigated from the following aspects:
1. The solenoid valve connector is loose or the wire falls off. The solenoid valve shall not be electric, and the wire can be fastened.
2, solenoid valve coil burned out, can remove the solenoid valve wiring, with a multimeter measurement, if open, the solenoid valve coil burned out. The reason is that the coil is damp, causing bad insulation and magnetic leakage, resulting in excessive current in the coil and burned, so to prevent rain into the solenoid valve. In addition, the spring is too strong, the reaction force is too large, the coil turns too few, suction is not enough can also make the coil burned. In case of emergency, the manual button on the coil can be pressed from the "0" position to the "1" position to make the valve open.
3, solenoid valve stuck: solenoid valve sleeve and spool with a small gap (less than 0.008mm), generally is a single piece assembly, when there are mechanical impurities into or too little oil, it is easy to get stuck. The treatment method can be steel wire from the head hole inserted, so that it springs back. The fundamental solution is to remove the solenoid valve, take out the spool and spool sleeve, clean with CCI4, so that the spool is flexible in the valve sleeve. When disassembling, attention should be paid to the assembly sequence and external wiring position of each component, so as to reassemble and wire correctly. It is also necessary to check whether the spray hole of the oil mist is blocked and whether the lubricating oil is enough.
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 spool valve is worn and several cavities are channeling. When dealing with the solenoid valve failure of the switching system, the appropriate time should be selected to deal with the solenoid valve when it is out of power. If it cannot be handled within a switching gap, the switching system can be suspended and handled calmly.
