What is the purpose of the plug on the valve cover of larger valves?
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The unit’s circulating water valve is quite large; there is a hole on its valve cover covered with a plug. What is the purpose of this hole?
It is due to the large valves: when the valve is shut down and before maintenance, after the valve disc is closed, the water in the valve and its connected pipelines must first be drained. At this point, there is still some water inside the valve body that is at a higher level than the drainage level of the pipelines, and this water cannot be drained. Therefore, a plug at the bottom of the valve is needed, which can be removed to allow water to be drained, thereby ensuring that all the water inside the valve assembly, pipelines, and the valve body itself is completely removed. What do you think, LZ? Hehe
I see, is that so? I really didn’t expect it to have such an effect. It was indeed very inspiring. I’m asking out of curiosity: is what’s above the correct answer or just a guess?
3# duchaowin is probably the correct answer. Hehe, I encountered this situation once while working with my master; usually, it’s the construction team that handles such tasks, but that time I acted as an assistant, hehe
1. Unscrew the plug to release the air inside. 2. To prevent freezing, open the plug at the bottom of the valve in a timely manner to drain any condensed water.
It is used for pressure testing before the valve leaves the factory
What is the screw plug on the upper part of that ball valve for?