Definitions. As used in this Part 3, the following terms shall have
the meanings indicated.
AIR GAP SEPARATION
A physical break between a supply pipe and a receiving vessel.
The air gap shall be at least double the diameter of the supply pipe,
measured vertically above the top rim of the vessel, in no case less
than an inch. Air gaps must be rigidly mounted and the discharge end
of the supply pipe must not be threaded or provided with a means for
making connections. Use of an air gap means that there will be clear
vertical separation between the pressurized supply pipe and a nonpressurized
receiving vessel. This assembly may be installed on either low or
high hazard conditions.
APPROVED CHECK VALVE
A check valve that seats readily and completely. It must
be carefully machined to have free moving parts and assured water
tightness. The face of the closure element and valve seat must be
bronze, composition, or other noncorrodible material which will seat
tightly under all prevailing conditions of field use. Pins and bushings
shall be of bronze and other noncorrodible, nonsticking material,
machined for easily dependable operation. The closure element shall
be internally weighted or otherwise internally equipped to promote
rapid and positive closure in all sizes where this feature is obtainable.
This valve may only be used to protect against low hazard installations.
APPROVED DOUBLE CHECK VALVE ASSEMBLY
Two single independently acting check valves, including tightly
closing shut off valves located at each end of the assembly and suitable
test connections. This device must be approved as a complete assembly.
Double check valves are commonly used to protect against low to medium
hazard installations, such as food processing equipment or lawn sprinkler
systems. They may be used under continuous pressure and protect against
both backsiphonage and backpressure conditions.
APPROVED REDUCED PRESSURE ZONE BACKFLOW PREVENTER DEVICE
A minimum of two independently acting check valves together
with automatically operated pressure differential relief valve located
between the two check valves. In case of leakage of either check valve,
the differential relief valve, by discharging to the atmosphere, shall
operate to maintain the pressure between the checks at less than the
supply pressure. The unit must include tightly closing shut-off valves
located at each end of the device, and each device shall be fitted
with properly located test cocks. This device must also be approved
as a complete assembly. This assembly may be installed on either low
or high hazard conditions.
AUXILIARY SUPPLY
Any water supply on or available to the premises other than
the approved public water supply.
BACKFLOW PREVENTION DEVICE
Backflow devices prevent contaminated water or chemicals
from flowing back into the drinking water supply if there is a sudden
or unexpected change in water pressure. If a property requires a backflow
prevention device, it must be installed on water service lines to
the property.
CERTIFIED BACKFLOW PREVENTION DEVICE TESTER
An individual who has successfully completed a New York State
Department of Health-approved course in the testing of backflow prevention
devices and has been issued a certificate by the New York State Department
of Health.
CROSS-CONNECTION
Any unprotected connection between any part of a water system
used or intended to be used as a supply of water for drinking purposes
in a source or systems containing water or substance that is not or
cannot be approved as equally safe, wholesome and potable for human
consumption.
PUBLIC WATER SUPPLY
The Village of Red Hook's water supply approved by the New
York State Department of Health.
VACUUM BREAKER
Pressure type and non-pressure type. A vacuum breaker which
can only be used for internal plumbing control and, therefore, not
acceptable as a containment device.
VILLAGE
The Village of Red Hook, Dutchess County, New York.