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TERM
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EXPLANATION
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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. |
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Vacuum Breaker |
An anti-siphon device that prevents the backflow
of contaminated water into the water supply system. |
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Valve |
A device that regulates the flow of fluid. |
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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. |
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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. |
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Valve Seat Wrench |
Hexagonal end wrench inserted into the hexagonal
opening in a valve seat for installing or removal. |
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Vanity |
A bathroom storage cabinet under the wash
basin. |
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Velocity Head |
The amount of energy required to accelerate
water to a given velocity; expressed in feet per head. |
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Vent |
A pipe that allows air into a drain system
to balance the air pressure, preventing water in the traps from being
siphoned off. |
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Vent Header |
A vent pipe into which several vents connect.
The vent pipe leads to the vent stack and out of the building.
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Vent Stack |
Upper portion of the soil stack above the
topmost fixture through which gases and odors escape. |
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Venting Materials |
Materials used for venting, i.e. PVC, CPVC,
ABS, metal. |
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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. |
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Viscosity |
The resistance of fluids to flow, due to internal
forces and friction between molecules, which increases as its temperature
decreases. |
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Vitreous Surface |
Material on some plumbing fixtures derived
from or consisting of glass, translucent, and low on porosity.
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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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Volatile |
Capable of vaporization at a relatively low
temperature. |
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Volumetric |
Refers to measurement by volume rather than
weight. |
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Volute Casing |
Derives is name from a spiral shaped casing
surrounding the pump impeller. It converts velocity energy to pressure
energy. |
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Voral Tube |
Flexible steel hose used for hand-held shower
sprays. |
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