Cause of solenoid valve coil burn out

Solenoid valve has electromagnetic coil and magnetic core of these two parts, including one or more holes in the valve body. When the coil in the solenoid valve is energized or disconnected, the magnetic core operation will make the fluid through the valve body or be blocked, and to change the direction of the fluid. Because the current is to pass through the coil, so the solenoid valve coil may be burned out, of course, the reasons may be different, let's take a look at the solenoid valve coil burned out what are the reasons.

External causes:

The stable operation of the solenoid valve is closely related to the cleanliness of the fluid medium, many media will have some fine particles or medium calcification, these fine substances will slowly adhere to the spore, gradually hardened, many people found that the first night is still running normally, to the next morning the solenoid valve can not be opened, It turns out that there is a thick layer of calcium deposits on the spool. This situation is the most common and is the main factor that causes the solenoid valve to burn, because when the spool is stuck, FS=0, at the moment I=6i, the current will surge six times, ordinary coil is very simple to burn.

Internal reasons:

Solenoid valve slide valve sleeve and spool cooperation gap is very small (less than 0.008mm), generally is a single piece assembly, when there is mechanical impurities into or too little oil, it is very simple stuck. The treatment method can be wire from the head hole into, 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 connection orientation of each part, so as to reassemble and connect correctly. It is also necessary to check whether the spray hole of the oil mist is blocked and whether the lubricating oil is enough. Solenoid valve coil burned out, can remove the solenoid valve wiring, with a multimeter measurement, if open, the solenoid valve coil burned. The reason is that the coil is damp, resulting in poor insulation and magnetic leakage, the formation of excessive current in the coil and incineration, 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 burn. Urgent treatment, can be the manual button on the coil from the normal operation of the "0" to "1" position, so that the valve open.

Solenoid valve coil detection

Use a multimeter to measure the resistance of the solenoid valve, the resistance of the coil should be about 100 ohm, if the resistance of the coil is infinite, it can also be used to power the solenoid valve coil with iron products on the solenoid valve, because the solenoid valve with magnetic can absorb iron products after the solenoid valve coil is energized. If you can absorb iron products to clarify the coil is good, but know that the coil is broken. Solenoid valve coil short circuit or break detection method is the first multimeter measurement of its on and off, the resistance value tends to zero or infinity, that describes the coil short circuit or break. If the resistance value is normal, can not clarify the coil must be good, should also find a small screwdriver to wear in the solenoid valve coil near the metal rod, and then to the solenoid valve energized, if you feel magnetic, then the solenoid valve coil is good, otherwise it is bad.

Above is the introduction of the reasons for the solenoid valve coil burn out, whether it is external or internal reasons caused by the solenoid valve coil burn out, which should cause our attention. In the usual use to prevent the water into the solenoid valve, but also should often check the solenoid valve, to ensure that the solenoid valve can be used for a longer time.