Question: What is the purpose of this hole on the safety valve body?
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The safety valve from Beijing Aerospace Petrochemical, model: 1.5G3HTBLM0210B-S, has a vent hole on its body; there is no plug in place. Once the valve behind the safety valve is opened, air leaks out through this hole. Could you tell me what’s going on here? This hole shouldn’t allow air to leak through, right? What is the purpose of this hole? Why is there air leakage?
Your photo is like trying to help a blind person touch an elephant; it’s difficult to determine exactly where that hole is on the valve. It is recommended to take a panoramic view of the location where this hole is situated; it should also be specified whether this opening has threads. Guess. There is a hole on the safety valve to perform online pressure testing of its setting point. I’m not sure if it’s this effect. For reference.
For those with back pressure, it should be blocked during calibration. This one must be old; the plug was thrown away. There should also be a threaded port, which is likely the adjustment screw. I wonder which opening you took a picture of.
These holes are designed to prevent back pressure
Lacrimal pore: prevents fluid accumulation from freezing and blocks the exit
You will find that the answers are conflicting; go to the manufacturer to confirm what type of safety valve it is. Whether to block or keep it open depends on the instructions. Don’t be the one who doesn’t know how to make decisions.
Drain the accumulated fluid to prevent it from freezing and causing blockages at the rear end
The problem is that once the safety valve is put into use, the manual valve on the pipeline starts to leak air; there are two valves in one set, and the other one is fine.
For the balance hole of safety valves, you can refer to this post: https://bbs.hcbbs.com/thread-1354870-1-1.html
First determine the type of safety valve, and then take pictures of everything before proceeding