A float detects changes of elevation in the liquid free surface and opens or closes a valve accordingly. Large numbers of small float valves are used in domestic water systems. A float valve maintains the level in the cold water header tank which regulates the pressure of the hot water system.
![Brass None Return Valve[Spring Type]](https://shop.ptauganda.com/wp-content/uploads/2021/02/100182104_non_return_valve_1_inch_1_1-300x300.jpg)
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