Cause Analysis of a One-Way Solenoid Valve Being Unusable After Power-On

After a one-way solenoid valve is powered on, a fault may occur, especially after being used for a period of time; a normally open solenoid valve often shows similar situations, because the gap between the spool sleeve and the valve core of the solenoid valve is not large (0.008 mm), so it is usually assembled piece by piece. If debris from industrial equipment enters, or the grease content is too low, clogging easily occurs. The solution is to pierce the small round hole at the top with a stainless steel wire and bounce it back. The basic method is to remove the solenoid, remove the valve core and valve core sleeve, and clean them with CCl4, so that the valve core operates flexibly in the valve sleeve.

When a pneumatic one-way solenoid valve has a problem, it is closely related to the operation of the directional valve and the control valve. A common fault is that a solenoid valve with signal feedback does not work normally, which should be checked from the following aspects:

(1) The solenoid connector has fallen off or the wire connection has come loose, so the solenoid valve cannot be energized; the wire connection can be fixed.

(2) The coil is burned out (e.g., a household water pipe); the wires of the stainless steel solenoid valve can be removed and measured with a multimeter; if the wire is broken, the solenoid valve coil will be burned out.

The reason is that moisture in the coil causes poor insulation and magnetic leakage, making the current in the coil too large and damaging it; therefore, rainwater must be prevented from entering the solenoid valve. In addition, a firm torsion spring, an excessive recoil force, too few turns of the coil winding, and poor suction capacity will also cause the coil to be damaged. In an emergency, during normal operation, the manual button inside the coil can be switched from the '0' position to the '1' position to open the valve.

(3) If too many one-way solenoid valves are supplied, they may become stuck; the fitting clearance between the spool sleeve and the valve core of the solenoid valve is not large (0.008 mm), and single-piece assembly is usually used. If oil stains from industrial equipment are brought in or there is too little grease, clogging easily occurs. The solution is to pierce the small round hole at the top with a stainless steel wire and bounce it back. The basic method is to remove the solenoid, remove the valve core and valve core sleeve, and clean them with CCl4 so that the valve core operates flexibly in the valve sleeve. When disassembling and assembling, pay attention to the assembly order of each part and the position of the external wiring; assemble and connect correctly, and at the same time check whether the oil pump hole of the triplet is blocked and whether the grease is sufficient.

(4) Steam leakage from a solar one-way solenoid valve will cause insufficient air pressure, forcing the high-pressure solenoid valve to be difficult to open, because the gasket or spool is damaged, causing air leakage on multiple inner walls.

When dealing with common solenoid valve faults in a switching system, choose the right timing and handle it when the solenoid valve trips. If it cannot be completed within one switching interval, the switching system can be cut off and dealt with calmly.