BACKFLOW TROUBLESHOOTING
EXAMINATION TEST QUESTIONS ANSWERS
ACCURATE REVIEW SHEET GRADED A+
●● When testing the inlet pressure of a PVB you have opened the high
side needle valve 1/4 turn. The indicated differential pressure is 0.0 but
the air inlet has not opened. What does this indicate?
Answer: The air inlet is stuck closed
●● The CV's in a DC Assembly shall be drip tight in the direction of
flow and hold:
Answer: 1.0 PSI in direction of flow
●● When testing the CV of a SVB you are attempting to lower the
pressure in the valve body. As you attempt to lower the pressure water
continues to discharge from the assembly with no decrease in pressure.
What does this indicate?
Answer: The #1 SOV is leaking
●● When testing the #1 CV of a DC water continues to discharge from
the sight tube on the #3 testcock. How do you proceed?
Answer: Observe the reading on the test kit, open the bleed valve
arrangement on the #2 testcock to compensate for the leaking #1 SOV
, ●● As you approach a RP to perform a field test you observe the relief
valve continuously discharging water. What does this indicate?
Answer: The #1 CV is fouled
●● when testing the #2 CV of a DC you open #4 testcock and the water
recedes from the sight tube. What does this indicate?
Answer: The #2 SOV is leaking with demand
●● When testing the #2 CV of a RP you apply pressure to the low side
of the #2 CV and the indicator on your test kit drops to the relief valve
opening point with water discharging from the relief valve. How do you
proceed?
Answer: Open the low side bleed needle valve
●● The air inlet of a PVB fails to open when the high side needle valve
is opened 1/4 turn. The test kit remains at the high end of the scale. How
do you proceed?
Answer: Close the high side needle valve
●● as you start testing #1 CV of a DC you open #3 testcock and water
recedes from the site tube. What does this indicate?
Answer: The #2 CV is leaking and the #2 SOV is leaking with demand
(lower test kit down to get gauge read and record read for leaking #2
CV)
EXAMINATION TEST QUESTIONS ANSWERS
ACCURATE REVIEW SHEET GRADED A+
●● When testing the inlet pressure of a PVB you have opened the high
side needle valve 1/4 turn. The indicated differential pressure is 0.0 but
the air inlet has not opened. What does this indicate?
Answer: The air inlet is stuck closed
●● The CV's in a DC Assembly shall be drip tight in the direction of
flow and hold:
Answer: 1.0 PSI in direction of flow
●● When testing the CV of a SVB you are attempting to lower the
pressure in the valve body. As you attempt to lower the pressure water
continues to discharge from the assembly with no decrease in pressure.
What does this indicate?
Answer: The #1 SOV is leaking
●● When testing the #1 CV of a DC water continues to discharge from
the sight tube on the #3 testcock. How do you proceed?
Answer: Observe the reading on the test kit, open the bleed valve
arrangement on the #2 testcock to compensate for the leaking #1 SOV
, ●● As you approach a RP to perform a field test you observe the relief
valve continuously discharging water. What does this indicate?
Answer: The #1 CV is fouled
●● when testing the #2 CV of a DC you open #4 testcock and the water
recedes from the sight tube. What does this indicate?
Answer: The #2 SOV is leaking with demand
●● When testing the #2 CV of a RP you apply pressure to the low side
of the #2 CV and the indicator on your test kit drops to the relief valve
opening point with water discharging from the relief valve. How do you
proceed?
Answer: Open the low side bleed needle valve
●● The air inlet of a PVB fails to open when the high side needle valve
is opened 1/4 turn. The test kit remains at the high end of the scale. How
do you proceed?
Answer: Close the high side needle valve
●● as you start testing #1 CV of a DC you open #3 testcock and water
recedes from the site tube. What does this indicate?
Answer: The #2 CV is leaking and the #2 SOV is leaking with demand
(lower test kit down to get gauge read and record read for leaking #2
CV)
