Does anyone know what this hole on the valve cover is for?
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As shown in the picture, it is said to be for exhaust; how is exhaust handled?
First, a full-image view, and then a partial view. I can’t tell what kind of valve it is, let alone what its functions are
Is this for connectivity purposes? As the valve stem rises, the space becomes smaller, and the gas or liquid inside needs to be expelled; it would be better to introduce some resistance so that it’s harder to open ； The same should be true in reverse. It feels that way; I’m not sure if it’s correct.
Holding the pipa and covering half of her face, it looks like a stop valve