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2. Check valve - Wikipedia

   en.wikipedia.org/wiki/Check_valve

   A butterfly check valve is a variant on the swing check valve, having two hinged flaps which act as check valves to prevent backwards flow. It should not be confused with the similarly named butterfly valve, which is used for flow regulation and does not have a one-way flow function.

3. File:Swing Check Valve Opening and Closing.webm - Wikipedia

   en.wikipedia.org/wiki/File:Swing_Check_Valve...

   You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.

4. 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.

5. Glossary of boiler terms - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_boiler_terms

   See also priming. Check valve Clack valve Clack from the noise it makes. A non-return valve where the feedwater enters the boiler drum. They are usually mounted halfway along the boiler drum, or else as a top feed, but away from the firebox, so as to avoid stressing it with the shock of cold water.

6. Hydraulic machinery - Wikipedia

   en.wikipedia.org/wiki/Hydraulic_machinery

   Shuttle valves provide a logical or function. Check valves are one-way valves, allowing an accumulator to charge and maintain its pressure after the machine is turned off, for example. Pilot controlled check valves are one-way valve that can be opened (for both directions) by a foreign pressure signal.

7. Valve - Wikipedia

   en.wikipedia.org/wiki/Valve

   These water valves are operated by rotary handles. A valve is a device or natural object that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways. Valves are technically fittings, but are usually discussed as a separate category. In ...