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  2. 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. [1]

  3. North American Fire Hose Coupler Incompatibilities - Wikipedia

    en.wikipedia.org/wiki/North_American_Fire_Hose...

    Fire Department Supply and Linen Hose Section of the War Industries Board recommended that for the duration of the war "hydrants, hose valves, hose couplings, nipples, and nozzles 1 + 14-inch to 2-inch, inclusive, to be iron pipe thread for new work, hose gauge or special threads only to be used for replacement or extension of existing ...

  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. Valve leakage - Wikipedia

    en.wikipedia.org/wiki/Valve_leakage

    Class III valves have no more than 0.1% leakage under those conditions; this may require soft valve seats, or lapped metal surfaces; Class IV valves have no more than 0.01% leakage under those conditions; this tends to require multiple graphite piston rings or a single Teflon piston ring, and lapped metal seats.

  6. Reed valve - Wikipedia

    en.wikipedia.org/wiki/Reed_valve

    Reed valves are used in the cheap but inefficient pulse jet engine, such as the one used by the Argus As 014 engine in the German V-1 (flying bomb). The valves at the front of the cylindrical engine are opened by the low pressure in the combustion chamber caused by the resonance of the air column in the engine, fuel is squirted into the ...

  7. 'Heartbreaking:' Wildfires leave Los Angeles communities in ...

    www.aol.com/heartbreaking-wildfires-leave-los...

    Stark images show the "heartbreaking" aftermath of the Los Angeles County wildfires, which continue to burn.

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