What is inside the red circle of this control valve, and what is its purpose?

2021-10-06View Original

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What is inside the red circle of this control valve, and what is its purpose?

Reply #22021-10-06

As the name implies, it is used to prevent rainwater from entering. In cold winter conditions, if there is water inside the diaphragm head, it will freeze, preventing the valve from functioning properly ； In this type of diaphragm head, there is usually a spring in the upper part; if water accumulates, the spring and other metal components can also corrode, etc

Reply #32021-10-06

In other words, is it connected to the outside world?

Reply #42021-10-06

:L can be called a breathing hat or a rainproof hat, allowing communication with the outside world

Reply #52021-10-06

Used for exhaust that is connected to the atmosphere. Cover it with a rain cover to prevent water from getting in.

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