| During Installation and Commissioning |
None of the valves can open, but the pilot/armature operates normally. |
Air supply pressure is too low, or the input voltage is insufficient. |
Check the air supply pressure. Check the input voltage and restore it to the rated value if necessary. |
| During Installation and Commissioning |
Some valves do not operate, while the others work normally. |
Loose wiring connection or faulty solenoid coil. Electromagnetic interference from nearby high-voltage or high-frequency equipment may also affect operation. |
Check the wiring and solenoid coil. Keep the valve away from high-voltage/high-frequency equipment or add suitable shielding. Replace faulty components if necessary. |
| During Installation and Commissioning |
None of the valves can close. Air leakage is present and the air tank cannot build pressure. |
For submerged/Y-type valves, one or more valves connected to the same air tank may be leaking, causing all valves to lose pressure. |
Identify and repair the leaking valve. |
| During Installation and Commissioning |
None of the valves can close. Air leakage is present and the air tank cannot build pressure. |
For right-angle/Z-type valves, the inlet and outlet may have been installed in the wrong direction. |
Reinstall the valve with the inlet and outlet in the correct direction. |
| During Installation and Commissioning |
Some valves cannot close completely and air leakage occurs. |
Dirt or debris is trapped on the diaphragm, or the armature/moving core is stuck. |
Clean the diaphragm. Check that the diaphragm is intact. Inspect and clean the armature and pilot air passage. |
| During Installation and Commissioning |
The valve closes slowly. |
The diaphragm bleed/orifice hole is blocked. |
Clean the diaphragm bleed/orifice hole. |
| During Operation |
Some valves leak, the diaphragm cannot close completely, or the valve remains partially open. |
Debris is trapped on the diaphragm, the pilot assembly is damaged, or the moving core is blocked. |
Clean the diaphragm and pilot assembly. Check that the diaphragm is intact. Inspect the armature and air passage, and replace damaged parts if necessary. |
| During Operation |
The solenoid coil becomes hot or burns out. |
The coil has been energized continuously for too long. |
Check the controller operation and make sure the valve is not energized for longer than the specified pulse duration. |
| During Operation |
Voltage is present, but the valve does not operate. |
The diaphragm is damaged or the bleed/orifice hole is blocked. |
Replace the damaged diaphragm or related parts, and clean the blocked orifice. |
| During Operation |
At ambient temperatures below -20°C, the valve leaks and cannot open properly. |
Low temperature causes frost or icing inside the valve. |
Provide suitable insulation or heating and maintain the valve within the recommended operating temperature range. |
