Check valves are used to control the direction of system products flow.
The system product flow is in one direction only. Figure below shows cutaway view of a check valve.
When the system product is flowing, the disc inside the valve is forced upward allowing flow.
If the flow direction changes (backflow occurs), the disc swings down onto a seat and the valve closes.
Check valves are classed as self-actuated, straight line valves.
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Check Valve How it works?
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