Non-return valve

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Non-Return Valve

A non-return valve (or check valve) is a valve which allows for flow in only one direction. These valves are common on-board ships, for example as a safety device to prevent back-flooding of sea-facing discharges.

Non-return valves can also be specified to have rather high cracking pressures (the lowest pressure which the valve allows for any flow), for example to prevent overpressure in a line or system.

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