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  2. Double check valve - Wikipedia

    en.wikipedia.org/wiki/Double_check_valve

    A double check valve or double check assembly (DCA) is a backflow prevention device designed to protect water supplies from contamination. [1] It is different from the two-way check valves (sometimes erroneously referred to as double check valves) used in air brake systems on heavy trucks which select from the highest pressure source.

  3. Check valve - Wikipedia

    en.wikipedia.org/wiki/Check_valve

    Tilting-disc inconel check valve Check valve symbol on piping and instrumentation diagrams.The arrow shows the flow direction. Vertical lift check valve. A check valve, non-return valve, reflux valve, retention valve, foot valve, or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction.

  4. Reduced pressure zone device - Wikipedia

    en.wikipedia.org/wiki/Reduced_pressure_zone_device

    In the case of the downstream check valve passing, the differential pressure relief valve prevents the possibility of the chamber pressure from exceeding the supply pressure. It is theoretically possible that, when both valves are faulty, backflow could occur, should the reverse flow rate exceed the capacity of the relief valve.

  5. List of valves - Wikipedia

    en.wikipedia.org/wiki/List_of_valves

    Foot valve: a check valve on the foot of a suction line to prevent backflow; Four-way valve: was used to control the flow of steam to the cylinder of early double-acting steam engines; Freeze seal or Freeze plug: in which freezing and melting the fluid creates and removes a plug of frozen material acting as the valve

  6. Blowout preventer - Wikipedia

    en.wikipedia.org/wiki/Blowout_preventer

    A typical subsea deepwater blowout preventer system includes components such as electrical and hydraulic lines, control pods, hydraulic accumulators, test valve, kill and choke lines and valves, riser joint, hydraulic connectors, and a support frame. Two categories of blowout preventer are most prevalent: ram and annular. BOP stacks frequently ...

  7. Backflow prevention device - Wikipedia

    en.wikipedia.org/wiki/Backflow_prevention_device

    Check valve (usually not a legally approved method of backflow prevention.) Chemigation valve (primarily used in agriculture) Double check valve assembly (DCVA) Dual check valve (A dual check is not a testable device and is mainly used on residential customers) Pressure vacuum breaker assembly (PVB) Reduced pressure zone device (RPZ)

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