In water supply systems, the ‘Reflux Valves' allow water

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In water supply systems, the ‘Reflux Valves' allow water to flow

1. In one direction only
2. In both directions
3. Through air locked joints
4. Only under low pressure

Correct Option: A

Reflux Valve is also called as NRV (Non-Return Valve) and Check valve. This is a valve where flow can proceed in one direction only. Reflux valves are generally used on gravity and rising mains as they permit water to flow in one direction only and check all the return flow.