When disassembling a solenoid valve, first loosen the elastic cylindrical pin and remove the solenoid from the air system. This creates a passage in the air system, facilitating the removal of the core cone, seat cone, and solenoid shaft. After removing the pipe fitting, the spring can be removed. Remove the solenoid without damaging the sealing cap; other parts are connected by flanges or adhesive.
The valve installation method is the reverse of its disassembly. The valve seat cone stroke should have a 0.6–0.8 mm gap between the valve and the base, and a minimum closing voltage should be achieved to press the core cone onto the base. Different shaft lengths must be used for the valve seat cone, and all threaded connections must be reliable. Troubleshooting methods for solenoid air valves are as follows: Malfunction when the circuit is connected: Malfunction when the circuit is connected is generally caused by a cut or blocked power supply wire; interruption of the solenoid coil; insufficient voltage in the main circuit; excessive pressure in the air distribution system; excessive shaft length; excessive dust in the air system; and corrosion of the iron core due to seal damage. The main solutions include: tightening connections (wires), replacing the electromagnet coil to increase voltage, checking for high voltage loss in the power supply, and checking the medium voltage of the power supply; ensuring the specified pressure of the valve train system. Disassemble the valve and replace it with a suitable shaft; disassemble the air system, clean all components, and replace the electromagnet.
Air escapes when the valve is in the stationary position (i.e., the circuit is broken). The common cause of a broken circuit is that the exhaust pipe connector is not tightened, or there is dust or wear on the rubber seal of the valve cone. The usual solution is to tighten the exhaust pipe connector, clean, or replace the rubber seal on the valve cone.
Air escapes when in the working position. This can occur through the air hole or through the threaded connection. Air escape should be investigated for causes such as dust or wear on the rubber seal of the valve cone; a shaft that is too short; or a loose threaded connection. The solutions for these situations are to replace the valve cone, clean or replace the valve cone rubber seal; replace with a suitable shaft; and tighten the threaded connection.