What are the common faults of solenoid valve? How to exclude?

- Apr 24, 2018-

Solenoid valve (Electromagnetic valve) is an electromagnetic control of industrial equipment, is used to control the flow of the automation of the basic components, belong to the actuator, not limited to hydraulic, pneumatic. The direction, flow rate, speed and other parameters of the media are adjusted in the industrial control system.

Solenoid valve fault will directly affect the switching valve and control valve action, the common fault has solenoid valve does not act, should be the following 4 aspects of the investigation: What are the common faults of solenoid valve?

How to exclude? (1) Air leakage. Leakage will cause air pressure is not enough, make forced valve opening and closing difficult, because the seal gasket damaged or slip valve wear and caused several cavity channeling gas.

In the process of switching system solenoid valve fault, should choose the appropriate time, such as the solenoid valve in the loss of power processing, if in a switch gap within the processing, you can suspend the switching system, calmly handle. (2) Solenoid valve jammed. Solenoid valve sleeve and spool of the matching gap is very small (less than 0.008mm), is generally a single assembly, when there are mechanical impurities or lubricants too young, it is easy to get stuck. The treatment method can be used to poke the steel wire from the small hole in the head to bounce back. The fundamental solution is to remove the solenoid valve, remove the spool and spool sleeve, with CCI4 cleaning, so that the spool in the valve sleeve action flexible.

Disassembly should pay attention to the assembly sequence and the external wiring position, so that the assembly and wiring is correct, but also to check the oil spray hole plug, whether the lubricant is sufficient.

(3) Solenoid valve connector loose or off the head, solenoid valve can not be electrically, fastening the thread. (4) Solenoid valve coil burnt out, can remove the solenoid valve wiring, measuring with a multimeter, if open, then solenoid valve coil burnt out. Reason wire coil damp, cause insulation is not good and magnetic leakage, resulting in the coil current too large and burned, so to prevent rainwater into the solenoid valve. In addition, the spring is strong, the reaction is too large, coil turns too few, suction is not enough can make coil burn. Emergency handling, can be the manual button on the coil from the normal operation of the "0" bit to "1" bit, so that the valve open.