I would like to ask where the pressure relief hole of a safety valve is located
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I would like to ask the experts: is it only at the location I marked in the first image that there is a pressure relief hole, while there are no such holes in the other two images?
Do you mean the pressure relief hole as the discharge port? The discharge port is the outlet flange on the right side. In your picture, that is a bellows safety valve; it requires an opening in the valve cover to allow air to pass through, not a pressure relief hole
For manual venting, the handle can be lifted to release pressure.
Thank you for your answer! I feel that the pressure relief hole does not refer to an exhaust port; what needs to be checked here is that the pressure relief holes provided for the bellows should be open and clean. :)
The bellows are inside; how can it be opened and cleaned?