Why Does the Solenoid on the Hydraulic Valve Burn Out?


The hydraulic solenoid valve has two parts: a solenoid coil and a magnetic core. It is a valve body containing one or more holes. When the coil in the hydraulic solenoid valve is energized or de-energized, the operation of the magnetic core will cause the fluid to pass through the valve body or be cut off to change the direction of the fluid. Because the current passes through the coil, the solenoid valve coil may be burnt out. Of course, there are other reasons for burnout. Let's take a look at the reasons for the burnout of the hydraulic solenoid valve coil.

External Cause

The stable operation of the hydraulic solenoid valve is inseparable from the cleanliness of the fluid medium. There are some fine particles in many mediums, and these fine substances will slowly adhere to the valve core and gradually harden. The operation was normal, and the solenoid valve could not be opened the next morning. When it was disassembled, it turned out that there was a thick layer of calcification deposit on the valve core. This is the most common situation, and it is also the main factor that causes the solenoid valve to burn out, because when the spool is stuck, FS=0, at this time I=6i, the current will surge six times, and ordinary coils are easy to burn.

Internal Reason

The fitting clearance between the slide valve sleeve and the valve core of the hydraulic solenoid valve is very small (less than 0.008mm), and it is generally a single-piece assembly. When mechanical impurities are brought in or there is too little lubricant, it is easy to jam. The treatment method can be made by inserting a steel wire through a small hole in the head to make it rebound. The fundamental solution is to remove the solenoid valve, take out the valve core and valve core sleeve, and clean it with CCI4 to make the valve core move flexibly in the valve sleeve. When disassembling, pay attention to the assembly sequence of the components and the position of the external wiring, so that the reassembly and wiring are correct, and check whether the oil spray hole of the lubricator is blocked and whether the lubricating oil is sufficient.

If the solenoid valve coil is burned out, the wiring of the solenoid valve can be removed and measured with a multimeter. If it is open, the solenoid valve coil will burn out. The reason is that the coil is damp, causing poor insulation and magnetic leakage, causing excessive current in the coil and burning. Therefore, it is necessary to prevent rainwater from entering the solenoid valve. In addition, if the spring is too hard, the reaction force is too large, the number of turns of the coil is too few, and the suction force is not enough to cause the coil to burn. For emergency treatment, you can turn the manual button on the coil from the "0" position to the "1" position during normal operation to open the valve.

Hydraulic Solenoid Valve Coil Detection

The detection method of hydraulic solenoid valve coil short circuit or open circuit is to first measure its on-off with a multimeter. The resistance value approaches zero or infinity, which means the coil is short-circuited or open circuit. If the measured resistance is normal, it still does not mean that the coil must be good. You should also find a small screwdriver and place it near the metal rod that passes through the solenoid valve coil, and then energize the solenoid valve. If you feel magnetism, then the solenoid The valve coil is good, otherwise it is bad.

The above is the introduction of the solenoid valve coil burnout, whether it is caused by external or internal reasons, this should arouse our attention. In normal use, avoid letting water enter the solenoid valve, and check the solenoid valve from time to time to ensure that the solenoid valve can be used for a longer time.If you need to buy hydraulic solenoid valve coils, please click here.

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