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  2. Siphon - Wikipedia

    en.wikipedia.org/wiki/Siphon

    So the liquid flows from the higher-pressure area of the upper reservoir up to the lower-pressure zone at the top of the siphon, over the top, and then, with the help of gravity and a taller column of liquid, down to the higher-pressure zone at the exit. [2] [18]

  3. Flush toilet - Wikipedia

    en.wikipedia.org/wiki/Flush_toilet

    A high-pressure valve located in the center of the vessel holds the air and water inside until the user flushes the toilet. [ 12 ] During flushing, the user activates the valve via a button or lever, which releases the pressurized water into the bowl at a flow rate much higher than a conventional gravity-flow toilet.

  4. Backflow prevention device - Wikipedia

    en.wikipedia.org/wiki/Backflow_prevention_device

    Back-siphonage occurs when higher pressure fluids, gases, or suspended solids move to an area of lower pressure fluids. For example, when a drinking straw is used to consume a beverage, suction reduces the pressure of fluid inside the straw, causing liquid to move from the cup to inside the straw and then into the drinker's mouth.

  5. Backflow - Wikipedia

    en.wikipedia.org/wiki/Backflow

    Backflow occurs for one of two reasons, either back pressure or back siphonage. [1] Back pressure is the result of a higher pressure in the system than in its supply, i.e. the system pressure has been increased by some means. This may occur in unvented heating systems, where thermal expansion increases the pressure.

  6. Atmospheric vacuum breaker - Wikipedia

    en.wikipedia.org/wiki/Atmospheric_vacuum_breaker

    Inside this elbow is a poppet valve that is held "up" by the water pressure found in the system, closing the air entrance to the device. If the pressure in the "upstream side" is reduced to atmospheric pressure or below, the poppet valve drops and allows air to enter the system, breaking the siphon. [1]

  7. Ballcock - Wikipedia

    en.wikipedia.org/wiki/Ballcock

    A later innovation, the floatless fill valve, designed for low-profile, low-flow toilet tanks, uses a pressure-sensing diaphragm mechanism instead of a float to control the inlet valve. [4] Delay valves, which delay the filling until the level has dropped to a low level, avert short-cycling of the water supply.