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  2. Air lock - Wikipedia

    en.wikipedia.org/wiki/Air_lock

    'S' trap inlet to drain [further explanation needed]. The air lock phenomenon can be used in a number of useful ways. An 'S' trap (a pipe that descends from a reservoir, then curves back up, then down again) allows liquid to flow from top to bottom unhindered, and gas cannot flow through the trap unless it has enough extra pressure to overcome the liquid head of the trap.

  3. Flushometer - Wikipedia

    en.wikipedia.org/wiki/Flushometer

    The topmost pressure chamber slowly refills through its narrow passageway, pushing the valve cylinder back down gradually. A flush occurs while it is in its open mid positions. Because the water is gradually shut off, slower water at the end of the cycle that will not activate the siphon serves to refill the bowl.

  4. Flush toilet - Wikipedia

    en.wikipedia.org/wiki/Flush_toilet

    If not, then it is either a double trap siphonic or a non-siphonic toilet. If water is poured slowly into the bowl it simply flows over the rim of the waterway and pours slowly down the drain—thus the toilet does not flush properly. After flushing, the flapper valve in the water tank closes or the flush valve shuts; water lines and valves ...

  5. Siphon - Wikipedia

    en.wikipedia.org/wiki/Siphon

    Another possible contamination point is the water intake in the toilet tank. An anti-siphon valve is also required here to prevent pressure drops in the water supply line from suctioning water out of the toilet tank (which may contain additives such as "toilet blue" [53]) and contaminating the water system.

  6. Water hammer - Wikipedia

    en.wikipedia.org/wiki/Water_hammer

    Reduce the pressure of the water supply to the building by fitting a regulator. Lower fluid velocities. To keep water hammer low, pipe-sizing charts for some applications recommend flow velocity at or below 1.5 m/s (4.9 ft/s). Fit slowly closing valves. Toilet fill valves are available in a quiet fill type that closes quietly.

  7. Plumber's snake - Wikipedia

    en.wikipedia.org/wiki/Plumber's_snake

    A plumber's snake or drain snake or drain auger is a slender, flexible auger used to dislodge clogs in plumbing. The plumber's snake is often reserved for difficult clogs that cannot be loosened with a plunger. It is also sometimes called a toilet jack. A plumbers snake is often used by plumbers to clear a clogged drain pipe or sanitary sewer.

  8. 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.

  9. Trap (plumbing) - Wikipedia

    en.wikipedia.org/wiki/Trap_(plumbing)

    These devices avoid negative pressure in the drain pipe by venting room air into the drain pipe (behind the trap). A "Chicago Loop" is another alternative. When a trap is installed on a fixture that is not routinely used—such as a floor drain—the eventual evaporation of the water in the trap must be considered.

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