An electromagnetic valve has two parts: an electromagnetic coil and a magnetic core. When the coil in the electromagnetic valve is powered on or off, the operation of the magnetic core will cause the fluid to pass through the valve body or be cut off, thereby changing the direction of the fluid. Because current needs to pass through the coil, the electromagnetic valve coil may be burned out. Of course, the reasons for the burn out may be different. Now let's take a look at the reasons for the burn out of the electromagnetic valve coil? In summary, the causes of burnt solenoid valve coils are generally:
1. Coil quality issue, working too frequently can burn out
2. Instantaneous breakdown of surge overvoltage during shutdown;
3. If the power supply voltage is too high, it will burn out directly
4. Repeated impact, frequent on/off, resulting in overcurrent or overheating;
Unstable installation and excessive mechanical vibration can cause coil wear, wire breakage, and short circuit
So how to perform electromagnetic valve coil detection?
The simplest way is to measure the resistance of the solenoid valve with a multimeter, and the resistance of the coil should be around 100 ohms! If the resistance of the coil is infinite, it indicates that it is broken. If the resistance value is measured to be normal, it does not necessarily mean that the coil is good. A small screwdriver should be placed near the metal rod that runs through the solenoid valve coil, and then the solenoid valve should be energized. If magnetism is felt, then the solenoid valve coil is good, otherwise it is bad.
The above is an introduction to the causes of solenoid valve coil burnout, whether it is caused by external or internal reasons, which should be taken seriously. In normal use, water should be avoided from entering the interior of the solenoid valve, and the solenoid valve should be checked regularly to ensure that it can be used for a longer period of time.