Select the first letter of the word from the list above to
jump to appropriate section of the Hydrants Glossary.
Actuator Shaft
The mechanism which, through use of key,
regulates movement of the operating rod to open and close valve. Also referred to as the
Operating Mechanism.
Back Pressure
A pressure applying a force in a direction
opposite the normal flow direction.
Back Pressure Backflow
A reversal of the normal and intended
direction of flow caused by back pressure.
Back-Siphonage
The application of the siphon principle in
a water supply line which produces a flow of water in the direction opposite that normally
produced by the force of gravity.
Back-Siphonage Preventer
See VACUUM BREAKER
Backflow
A reversal of the normal and intended
direction of flow of water in a pipe line.
Backflow Preventer
A device or means to prevent backflow of
water in pipe lines.
Box (for Concealed Heads)
A function box to enclose the hydrant head,
concealing the nozzle for a flush fully-encased installation.
Casing
The sleeve which provides the conduit for
water between the head and valve housing.
Cross-Connection
Any connection to a portable water supply
system through which potable water is supplied to a service outlet and through which
contaminants unfit for human consumption can enter the potable water lines by back
pressure or back-siphonage backflow.
- (empty)
- (empty)
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- (empty)
Head
That part of hydrant having threaded nozzle
connection for attaching hose.
Hose Thread Outlet
The connector that permits the hose to be
attached to the hydrant.
Hot and Cold Non-Freeze W
A device, having hot and cold water inlet
connections, for installation in building walls with outlet concealed, in which the valves
are operable at temperatures below 32 O F
Hot and Cold Wall Hydrant
A device having hot and cold water inlet
connections for installation in building walls with outlet concealed, in which the valves
are not operable at valve body temperatures below 32O
F (0OC).
Hydrants
Manufactured device which conveys water
from supply pipe to a hose thread outlet, incorporating a valve(s) with opening and
closing means at point of use, with all working parts accessible for maintenance. Said means to be a removable (loose set) operating
key engaging a recessed operating stem.
Inlet
That part of hydrant having a connection to
supply water to the unit.
Inlet Connection
The connector that varies depending on size
and type of water supply pipe.
- (empty)
Key
A device to manually open and close off
flow of water from hydrant.
- (empty)
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Non-Freeze Ground (Yard)
A device for installation in ground with
outlet concealed at grade and inlet below frost line, in which the valve is operable at
temperatures below 32OF (0OC).
Non-Freeze Wall Hydrant,
A device for installation in building walls
with outlet exposed or concealed, in which the valve is operable at temperatures below 32OF
(OOC), for the protection of the portable water
supply against pollution by backflow through the hose threaded outlet.
Operating Rod (Stem)
The rod that connects operating mechanism
to valve.
- (empty)
- (empty)
- (empty)
- (empty)
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Vacuum Breaker
A device or means in a water supply line
which opens when there is loss of pressure allowing air to enter the pipe line at
atmospheric pressure and prevent back-siphonage should the supply pressure tend to fall to
sub-atmospheric, and which has the added capabilities for preventing back pressure
backflow should a pressure in the hose develop in excess of the supply pressu
Valve
That part of the hydrant which opens or
closes the water way.
Valve Housing
That part of the hydrant near the inlet
which contains the valve.
Valve Seal
That part of the valve which provides the
seal on closure.
Wall Clamp
An adjustable part to secure hydrant in
wall and meet various wall thickness by adjustment on casing.
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- (empty)
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- (empty)
Copyright © 2000-2007 by Jay R. Smith Mfg. Co.®
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