| Fault phenomenon | Cause diagnosis | Troubleshooting methods |
| Flange connection is not sealed (leakage) | Is the working surface of the valve intact | Repair flange working surface/replace flange |
| Is the valve deformed | Replace and add flange gasket | |
| Is the bolt tight and even | Evenly adjust bolts to loosen | |
| The valve is not sealed (internal leakage) | Is the valve in place | Remove stuck foreign matter |
| Is the valve seal intact | Clean and replace seal pair | |
| The valve does not open or close smoothly | Is the cylinder bumped | Replace cylinder |
| Is the air pressure insufficient or full | Inspect air supply pipeline | |
| Is the valve body transmission component abnormal | Adjust and replace parts |
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