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Vacuum Breaker - An anti-siphon device that prevents the backflow of contaminated water into the water supply system.
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.
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.
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.
Viscosity - The resistance of fluids to flow, due to internal forces and friction between molecules, which increases as its temperature decreases.
Vitreous China - Ceramic materials fired at high temperature to form a non-porous body, having exposed surfaces coated with ceramic glaze fused to the body. This is used to form bathroom fixtures such as toilets, bidets, and lavs.
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