- Vacuum Breaker:
- An anti-siphon device that prevents the back flow of contaminated water into the water supply system in the event of a negative pressure condition.
- Valve:
- A device that regulates the flow of water.
- Valve Body:
- The rough-in part of a faucet that is concealed in a wall or undercounter.
- Valve Dressing:
- Resurfacing a worn valve seat with a special tool. Stops leaks by providing a smooth sealing surface. Applies only to older compression style faucets.
- Valve Seat:
- The non-moving part of a valve. Water flow is stopped when the moveable portion of the valve comes in contact with the valve seat.
- Valve Seat Wrench:
- Hexagonal end wrench inserted into the hexagonal opening in a valve seat for installing or removal.
- Vanity Top:
- Bathroom cabinet with a wash basin set in the top.
- V-Clip:
- A clip shaped like the letter "V" used on a lavatory drain lift linkage assembly to easily adjust connection of the drain to the lift rod.
- Velocity Head:
- The amount of energy required to accelerate water to a given velocity; expressed in feet per head.
- Vent:
- A pipe that allows air into a drain system to balance the air pressure, preventing water in the traps from being siphoned off.
- Vent Header:
- A vent pipe into which several vents connect. The vent pipe leads to the vent stack and out of the building.
- Vent Stack:
- Upper portion of the soil stack above the topmost fixture through which gases and odors escape.
- Venting Materials:
- Materials used for venting, i.e. PVC, CPVC, ABS, metal.
- Venturi:
- A short tube with a tapered constriction in the middle that causes an increase in the velocity of flow of a fluid and a corresponding decrease in fluid
pressure and that is used for creating a suction in a vacuum pump.
- Vessel Sink:
- A lavatory, reminiscent of china washbasins with finished inside and outside walls, that is designed to sit on the countertop.
- Viscosity:
- The resistance of fluids to flow, due to internal forces and friction between molecules, which increases as its temperature decreases.
- Vitreous:
- Surface material on some plumbing fixtures derived from or consisting of glass, translucent, and low on porosity.
- Vitreous China:
- Ceramic materials fired at high temperature to form a non-porous body, having exposed surface coated with ceramic glaze fused to the body. This is used to form
bathroom fixtures such as toilets, bidets, and lavs.
- VOCs:
- Volatile Organic Compounds - Chemicals that can be found in drinking water and can cause cancer and many other dangerous health effects.
- Volatile:
- Capable of vaporization at a relatively low temperature.
- Volt:
- Unit of measure of electromotive force.
- Volumetric:
- Referring to measurement by volume rather than weight.
- Volute Casing:
- Derives its name from a spiral shaped casing surrounding the pump impeller. It converts velocity energy to pressure energy.
- Voral Tube:
- Flexible steel hose used for hand-held shower sprays.
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