UPDATE!!!!2025/2026|GUARANTEED
Absolute Pressure - ANSWER Pressure measured on a scale where a perfect vacuum is
zero . Absolute pressure is the sum of gage pressure and atmospheric pressure .
Accessible - ANSWER Capable of being reached for testing and maintenance it first
may require the removal of an access panel door or similar obstruction
Administrative Authority - ANSWER Individual Fishel or agency established by a state
county city created by law to administer and enforce provisions of the cross-connection
control program
Air Gap - ANSWER A physical separation between the free-flowing discharge end of a
potable water supply pipeline and an open or non-pressure receiving vessel. And approve
Air gap shall be at least twice the diameter of the supply pipe measured Vertically above The
overflow rim of the receiving vessel; In no case less than 1 inch.
Approved backflow prevention assembly - ANSWER And assembly that has been
investigated and Approved by the administrative authority having jurisdiction. The approval
of backflow prevention assemblies by the administrative authority shall be on the basis of a
favorable laboratory and field evaluation report by an approved testing laboratory
recommending such approval.
Approved check valve - ANSWER A check valve that is drip tight in the normal direction
of flow when the inlet pressure is at least 1.0 psi (pound per square inch) And the outlet
pressure is zero. The check valve shell permit no leakage In a direction reversed to the
normal flow. The closure element (eg: clapper or poppet) shall be internally loaded To
promote rapid and positive closure. And approve check valve is only one component of an
1
, approved backflow prevention assembly. (Ie: Pressure vacuum breaker {PVB and SVB},
Double check valve assembly {DC} or reduce pressure principal assembly {RP}.
Approved testing laboratory - ANSWER The foundation of Cross-Connection Control
and hydraulic research of the University of Southern California or other laboratory having
equivalent capabilities for both the laboratory and field evaluation of backflow prevention
assemblies
Approved water supply - ANSWER Any public potable water supply, which has been
investigated and Approved by the health agency having jurisdiction. The system must be
operating under a valid health permit. In determining what constitutes an approved water
supply, the health agency has final judgment as to its safety and portability.
Aspirator - ANSWER A device used for creating suction, specifically by flowing water
through a Venturi or restricted area of flow. At this restricted area of flow the pressure drops
to sub-atmospheric, thus suction is created. Usually a tube is attached at this location for
aspiration or suction purposes.
Aspirator effect - ANSWER The effect created by an aspirator, restricted area of flow or
undersized piping.
Atmospheric pressure - ANSWER The pressure (or weight per unit area) Exerted by the
atmosphere on a surface. At sea level the Atmospheric pressure is 14.7 psia (pounds per
square inch, absolute).
Atmospheric Vacuum Breaker Backsiphonage Prevention Assembly (AVB) -
ANSWER And assembly containing an air inlet valve, a check seat in an air inlet port(s).
(Also known as the non-pressure type vacuum breaker). The flow of water into the body
causes the air inlet valve to close the air inlet port(s). When the flow of water stops and the
air inlet valve falls and forms a check valve against backsiphonage. At the same time it opens
the air inlet port(s) Allowing air to enter and satisfy the vacuum. A shut off valve
immediately upstream may be a integral part of the assembly, but there shall Be no shutoff
valves or obstructions downstream. The assembly shall not be subjected to operating
pressure for more than 12 hours in any 24 hour period. An atmospheric vacuum breaker is
2
Absolute Pressure - ANSWER Pressure measured on a scale where a perfect vacuum is
zero . Absolute pressure is the sum of gage pressure and atmospheric pressure .
Accessible - ANSWER Capable of being reached for testing and maintenance it first
may require the removal of an access panel door or similar obstruction
Administrative Authority - ANSWER Individual Fishel or agency established by a state
county city created by law to administer and enforce provisions of the cross-connection
control program
Air Gap - ANSWER A physical separation between the free-flowing discharge end of a
potable water supply pipeline and an open or non-pressure receiving vessel. And approve
Air gap shall be at least twice the diameter of the supply pipe measured Vertically above The
overflow rim of the receiving vessel; In no case less than 1 inch.
Approved backflow prevention assembly - ANSWER And assembly that has been
investigated and Approved by the administrative authority having jurisdiction. The approval
of backflow prevention assemblies by the administrative authority shall be on the basis of a
favorable laboratory and field evaluation report by an approved testing laboratory
recommending such approval.
Approved check valve - ANSWER A check valve that is drip tight in the normal direction
of flow when the inlet pressure is at least 1.0 psi (pound per square inch) And the outlet
pressure is zero. The check valve shell permit no leakage In a direction reversed to the
normal flow. The closure element (eg: clapper or poppet) shall be internally loaded To
promote rapid and positive closure. And approve check valve is only one component of an
1
, approved backflow prevention assembly. (Ie: Pressure vacuum breaker {PVB and SVB},
Double check valve assembly {DC} or reduce pressure principal assembly {RP}.
Approved testing laboratory - ANSWER The foundation of Cross-Connection Control
and hydraulic research of the University of Southern California or other laboratory having
equivalent capabilities for both the laboratory and field evaluation of backflow prevention
assemblies
Approved water supply - ANSWER Any public potable water supply, which has been
investigated and Approved by the health agency having jurisdiction. The system must be
operating under a valid health permit. In determining what constitutes an approved water
supply, the health agency has final judgment as to its safety and portability.
Aspirator - ANSWER A device used for creating suction, specifically by flowing water
through a Venturi or restricted area of flow. At this restricted area of flow the pressure drops
to sub-atmospheric, thus suction is created. Usually a tube is attached at this location for
aspiration or suction purposes.
Aspirator effect - ANSWER The effect created by an aspirator, restricted area of flow or
undersized piping.
Atmospheric pressure - ANSWER The pressure (or weight per unit area) Exerted by the
atmosphere on a surface. At sea level the Atmospheric pressure is 14.7 psia (pounds per
square inch, absolute).
Atmospheric Vacuum Breaker Backsiphonage Prevention Assembly (AVB) -
ANSWER And assembly containing an air inlet valve, a check seat in an air inlet port(s).
(Also known as the non-pressure type vacuum breaker). The flow of water into the body
causes the air inlet valve to close the air inlet port(s). When the flow of water stops and the
air inlet valve falls and forms a check valve against backsiphonage. At the same time it opens
the air inlet port(s) Allowing air to enter and satisfy the vacuum. A shut off valve
immediately upstream may be a integral part of the assembly, but there shall Be no shutoff
valves or obstructions downstream. The assembly shall not be subjected to operating
pressure for more than 12 hours in any 24 hour period. An atmospheric vacuum breaker is
2
