Electromagnetic valve coil heating hot reason

There are many reasons for the solenoid coil burned, the spool is stuck, the voltage is too high, the ambient temperature is too high or too low, the pipeline or equipment continuous unstable vibration will cause the solenoid valve coil heating or burned, the solenoid valve spool is stuck is the main factor causing the solenoid valve coil heating or even the solenoid valve coil burned, generally divided into two situations.
1. External factors
The stable operation of the solenoid valve is closely related to the cleanliness of the fluid medium, we have a lot of customers used in pure water on the solenoid valve, with more than five years is still normal operation, many media inside there will be some fine particles or medium calcification, these fine substances will slowly adhere to the valve core, gradually hardened, many customers said that the first night is still running normally, In the morning of the next day, the solenoid valve could not be opened, and it turned out to be a thick layer of calcium deposits on the spool. It's like a bottle warmer at home.
This is the most common case, and also the main cause of solenoid valve burn, because when the spool is stuck, FS=0, at this time I=6i, the current will surge six times, ordinary coil is very easy to burn.
Solenoid valve
2. Internal factors
Solenoid valve slide valve sleeve and spool with a small clearance (less than 0.008mm), is generally single 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.
If the solenoid coil is burned out, remove the connection of the solenoid valve and measure with a multimeter. If the circuit is open, the solenoid coil is 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.