What to do if there’s a leak

The valve body is leaking; the valve needs to be replaced. The flange is leaking; the gasket or the flange itself needs to be replaced

For internal leakage, grind the valve seat and valve core; for external leakage, replace the gasket

The original poster’s question is rather confusing; they don’t even specify which part is leaking, so how can anyone answer it!

Firstly, there are two types of leakage in valves: 1. External leakage and 2. Internal leakage. External leakage refers to the leakage of the medium from around the valve stem; this is caused by poor-quality packing that isn’t wear-resistant, so replacing the packing will solve the problem. Internal leakage occurs when there is a leak between the valve and the pipeline flanges; this might be due to an insufficiently elastic gasket that has deformed, or perhaps the bolts connecting them aren’t tightened properly. Internal leakage can also occur if the valve isn’t closed fully or is opened too far. If it’s a manual valve, it’s recommended to move it back and forth to see if there’s still leakage. If leakage persists, the seal ring may be damaged, in which case it needs to be replaced. For pneumatic valves, it’s advisable to adjust the travel bolts of the pneumatic actuator; if leakage continues, disassemble the actuator, align the valve properly, and then reinstall the actuator. For electric valves, try adjusting them manually to see if the issue is resolved; if leakage remains, the seal ring is definitely damaged! :) I’m not sure if this answer satisfies the original poster. If the problem isn’t solved, feel free to contact me: QQ: 928976489 (Italy LAPAR), 13764138562, Guo Zhiwei