Reasons for Solenoid Valve Malfunction

A malfunction of the solenoid valve will directly affect the operation of the switching valve and the regulating valve. A common malfunction of steam solenoid valves is that the solenoid valve does not operate. The following aspects should be checked:

(1) Loose or disconnected wiring of the solenoid valve. The solenoid valve will not receive power. Tighten the wiring.

(2) Burned-out solenoid valve coil. Disconnect the solenoid valve wiring and measure with a multimeter. If the circuit is open, the solenoid valve coil is burnt out.

The reasons include moisture in the coil causing poor insulation and magnetic leakage, resulting in excessive current and burnout. Therefore, prevent rainwater from entering the solenoid valve. In addition, an overly stiff spring, excessive reaction force, or too few coil turns and insufficient suction can also cause the coil to burn out. In an emergency, the manual button on the coil of the valve actuator can be switched from the normal "0" position to the "1" position to open the valve.

(3) The solenoid valve is stuck. The clearance between the spool sleeve and the valve core of the solenoid valve is very small (less than 0.008mm), and they are generally assembled as a single piece. When mechanical impurities are introduced or the lubricating oil is insufficient, it is easy for the valve to become stuck. One solution is to insert a steel wire through the small hole at the head to make it spring back. The fundamental solution is to disassemble the solenoid valve, remove the valve core and valve core sleeve, and clean them to ensure the valve core moves freely within the valve sleeve. During disassembly, pay attention to the assembly sequence of each component and the location of external wiring to ensure correct reassembly and wiring. Also check if the oil mist lubricator nozzle is blocked and if the lubricating oil is sufficient.

(4) Air leakage. Air leakage will cause insufficient air pressure, making it difficult to open and close the forced valve. This is caused by damage to the high-temperature solenoid valve sealing gasket or wear of the spool sleeve, resulting in air leakage between several cavities.