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The reason why the solenoid valve coil is burned

- Nov 12, 2018 -

There are many reasons for the solenoid valve coil burning. The valve core is stuck, the voltage is too high, the ambient temperature is too high or too low, and the vibration of the pipeline or equipment is unstable. The solenoid valve coil will be heated or burned. The solenoid valve spool is Jamming is the main cause of the heating of the solenoid valve coil or even the solenoid valve coil, which is generally divided into two situations.

1. External factors

   The stable operation of the solenoid valve is inseparable from the cleanliness of the fluid medium. Many of our customers use solenoid valves on pure water. After more than five years, they still operate normally. Many media will have some fine particles or Calcification of the medium, these fine substances will slowly adhere to the valve core, and gradually become hard. Many customers report that the first night is still running normally. By the next morning, the solenoid valve will not open. There is a thick layer of calcification deposited on the spool. Just like the thermos of a household.

   This situation is the most common and is the main cause of the solenoid valve burnout, because when the spool is stuck, FS = 0, at this time I = 6i, the current will increase by six times, the ordinary coil is very easy to burn.

The electromagnetic valve

2, internal factors

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 a one-piece assembly. When mechanical impurities are introduced or the lubricating oil is too small, it is easy to get stuck. The treatment method can use the 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 core 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 and external wiring position of each component, so as to reassemble and wire correctly, and check whether the oil mist injection hole is blocked and the lubricating oil is sufficient.


If 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. 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. In emergency processing, the manual button on the coil can be turned from the “0” position to the “1” position during normal operation, so that the valve is opened.

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