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a check valve permits fluid flow in one direction, but blocks flow in the opposite direction. works as a vent, as overpressure or backpressure protection, or as an aid to a reprocationg pump or a cycling pump or servo-driven pistol. The pressure valve on a water heater allows excess hot water to escape to an outside location instead of in the house where it is located.

Simplified, it lets gas (air) or liquid go one way, but not the other. The valves of your heart are a good example of this.

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โˆ™ 2015-07-17 17:53:01
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Q: What are check valves and what are they primarily for?
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