Answer:
(1) Cause analysis.
1) The program controller fails and the solenoid valve does not work (there is no attraction when the solenoid head is touched with an iron object).
2) The muffler is blocked. When the solenoid valve is opened, the airflow is blocked when the high-pressure tank is depressurized, causing the shuttle valve driven by the pressure difference to fail to switch in time and become a three-way valve, which is discharged into the atmosphere through the muffler, causing the pressure of the two tanks to drop at the same time.
3) The solenoid valve does not work (normally closed). The solenoid valve coil is damaged or the wiring is loose or the throttling hole is blocked. This causes the tank body on one side of the faulty valve to always be in a high-pressure state.
4) The shuttle valve is stuck or leaking seriously. The main airflow leaks out and the pressure drops.
5) The solenoid valve diaphragm is broken, and the tank body on one side of the valve cannot maintain pressure (when the pressure is equalized, the pressure does not rise, and when working, the main airflow short-circuits and leaks out, and the pressure drops).
6) The throttle valve is not opened in place. At the end of the pressure equalization procedure, the pressure of the low-pressure tank did not rise to the equilibrium pressure, the shuttle valve could not switch normally, and the main air flow leakage pressure dropped suddenly.
(2) Troubleshooting method.
1) Check the joints and wearing parts according to the instructions of the electrical control part, and replace the components or circuit boards.
2) Remove the muffler. If the equipment resumes normal switching, the muffler should be replaced or backwashed before installation.
3) Check the wiring and suction of the solenoid valve, and remove foreign matter in the small hole channel.
4) Check whether there is any foreign matter in the shuttle valve cavity. Aluminum glue is prone to stagnation and valve corrosion in the case of long-term shutdown or oversaturation.
5) Remove the solenoid valve cover and replace the diaphragm.
6) Rotate the throttle valve counterclockwise to increase the regeneration gas volume until the pressure of the two tanks is equal.
