A check valve is a mechanical device, a valve, that normally only allows fluid to flow through it in one direction. A double check valve is often used as a backflow prevention device to keep potentially contaminated water from siphoning back into municipal water supply lines. A clapper valve is a type of check valve used in or with firefighting, and has a hinged gate (often with a spring urging it shut) that will only remain open in the outflowing direction. Some types of irrigation sprinklers and drip irrigation emitters have small check valves built into them to keep the lines from draining when the system is shut off.
Pressure relief valves
A pressure relief valve opens to release excess pressure when the pressure is too high to protect the vessel or other equipment from overpressurization. A relief valve is like a safety valve in that it is for liquids only. A safety valve is for gases only
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