BACKFLOW PREVENTION LATEST UPDATED
RECENT QUESTIONS AND ANSWERS SURE A+
✔✔What is the critical level of a pressure vacuum breaker measured from if not
marked? - ✔✔From the body inlet.
✔✔What may be found on a pressure vacuum breaker's assembly discharge piping? -
✔✔Irrigation sprinkler heads.
✔✔What is the minimum loading to open a pressure vacuum breaker's air-inlet valve? -
✔✔1 PSI (6.89 kPa).
✔✔When is the recorded value of a pressure vacuum breaker check valve determined?
- ✔✔When water stops flowing from test cock 2.
✔✔What type of valves must pressure vacuum breaker shut-off valves be? - ✔✔Tightly
closing.
✔✔What indicates that a pressure vacuum breaker is undersized for its application? -
✔✔Chatter of noise during flow.
, ✔✔What does continuous flow from a pressure vacuum breaker's test cock 2 indicate? -
✔✔Backpressure.
✔✔On what applications may pressure vacuum breakers not be used? - ✔✔Low hazard
/ backpressure.
✔✔How high should a double check valve assembly be installed above the floor? -
✔✔12 inches (30.5 cm).
✔✔What do double check valve assembly standards require for trapped air? -
✔✔Venting.
✔✔What is a non-health hazard only backflow preventer? - ✔✔A double check valve
assembly.
✔✔What must double check detector assembly flow indicators register? - ✔✔Low flows
up to 2 GPM (7.6 l/min).
✔✔What does a field test report for a double check valve assembly include? -
✔✔Manufacturer's name, model, size, and serial number.
✔✔What type of components do double check valve assembly components have? -
✔✔Independently acting.
✔✔What is required for the entire assembly after the repair of check valve two of a
double check valve assembly? - ✔✔A field test.
✔✔What does the installation of backflow prevention assemblies in a potable water
system do? - ✔✔Reduces water pressure downstream of the assembly.
✔✔When is a double check valve assembly allowed to be installed in a vertical flow
down orientation? - ✔✔If the assembly was tested and approved as such.
✔✔What does a field test reported value of 0.8 PSID (5.5 kPa) suggest for a double
check valve assembly? - ✔✔Disc softening or decay on the check valve.
✔✔What is the relief valve of a reduced pressure principle assembly mechanically
loaded to do? - ✔✔Push the disc away from its seat.
✔✔What must shut off valves on backflow assemblies be? - ✔✔Full port.
RECENT QUESTIONS AND ANSWERS SURE A+
✔✔What is the critical level of a pressure vacuum breaker measured from if not
marked? - ✔✔From the body inlet.
✔✔What may be found on a pressure vacuum breaker's assembly discharge piping? -
✔✔Irrigation sprinkler heads.
✔✔What is the minimum loading to open a pressure vacuum breaker's air-inlet valve? -
✔✔1 PSI (6.89 kPa).
✔✔When is the recorded value of a pressure vacuum breaker check valve determined?
- ✔✔When water stops flowing from test cock 2.
✔✔What type of valves must pressure vacuum breaker shut-off valves be? - ✔✔Tightly
closing.
✔✔What indicates that a pressure vacuum breaker is undersized for its application? -
✔✔Chatter of noise during flow.
, ✔✔What does continuous flow from a pressure vacuum breaker's test cock 2 indicate? -
✔✔Backpressure.
✔✔On what applications may pressure vacuum breakers not be used? - ✔✔Low hazard
/ backpressure.
✔✔How high should a double check valve assembly be installed above the floor? -
✔✔12 inches (30.5 cm).
✔✔What do double check valve assembly standards require for trapped air? -
✔✔Venting.
✔✔What is a non-health hazard only backflow preventer? - ✔✔A double check valve
assembly.
✔✔What must double check detector assembly flow indicators register? - ✔✔Low flows
up to 2 GPM (7.6 l/min).
✔✔What does a field test report for a double check valve assembly include? -
✔✔Manufacturer's name, model, size, and serial number.
✔✔What type of components do double check valve assembly components have? -
✔✔Independently acting.
✔✔What is required for the entire assembly after the repair of check valve two of a
double check valve assembly? - ✔✔A field test.
✔✔What does the installation of backflow prevention assemblies in a potable water
system do? - ✔✔Reduces water pressure downstream of the assembly.
✔✔When is a double check valve assembly allowed to be installed in a vertical flow
down orientation? - ✔✔If the assembly was tested and approved as such.
✔✔What does a field test reported value of 0.8 PSID (5.5 kPa) suggest for a double
check valve assembly? - ✔✔Disc softening or decay on the check valve.
✔✔What is the relief valve of a reduced pressure principle assembly mechanically
loaded to do? - ✔✔Push the disc away from its seat.
✔✔What must shut off valves on backflow assemblies be? - ✔✔Full port.
