BACKFLOW ASSEMBLY DIAGNOSTIC
EXAM QUESTIONS AND ANSWERS
Reduced Pressure Principle assembly (RP) Test no.1 Purpose - Correct Answers -To
test the operation of the differential pressure relief valve. The differential pressure relief
valve must operate to maintain the zone between the two check valves at least 2 psi.
Reduced Pressure Principle assembly (RP) Test No.2 Purpose - Correct Answers -
Tightness of No.2 Check valve
While field testing the reduced pressure principle assembly, an apparent first check
valve reading of 6.5 PSID was observed, and the relief valve opened at 2.5 PSID.
During the next step, the bypass hose is bled and attached to no.4 test cock. The No.4
test cock is opened. The low side of the field test kit is bled. And the bypass control
needed valve is opened. When the bypass control needle valve is opened the reading
on the field kit drop from 6.5 PSID to 4.2 PSID and hold steady. - Correct Answers -A.
Why does this Occur?
-This may be due to disc compression of the second check valve
B.What is the next step?
Record the no.2 check valve as closed tight
While Field testing the air inlet valve of the pressure vacuum Breaker Backsiphonage
prevention assembly, you record a reading of 1.9 PSID when the air inlet valve opens. -
Correct Answers -A. What is the condition of the air inlet valve?
-The air inlet valve is working properly
B.What is the next step?
-Remove hose from no.2 test cock, and drain water from the body to determine if the air
inlet valve fully opens
While field testing the check valve of the pressure vacuum breaker backsiphonage
prevention assembly, water continues to flow from the No.2 test cock once the NO.2
test cock is opened. - Correct Answers -A. What is the condition?
-The no.1 SOV is leaking
B.What is the next step?
-Compensate for the leak by opening the bleed valve on the no.1 test cock
While field testing the Pressure Vacuum breaker Backsiphonage Prevention Assembly
the air inlet valve opens after the No.2 and No.1 shutoff valve are closed. - Correct
Answers -A. What is the condition of the assembly?
- There is a leaking No.2 shutoff valve
EXAM QUESTIONS AND ANSWERS
Reduced Pressure Principle assembly (RP) Test no.1 Purpose - Correct Answers -To
test the operation of the differential pressure relief valve. The differential pressure relief
valve must operate to maintain the zone between the two check valves at least 2 psi.
Reduced Pressure Principle assembly (RP) Test No.2 Purpose - Correct Answers -
Tightness of No.2 Check valve
While field testing the reduced pressure principle assembly, an apparent first check
valve reading of 6.5 PSID was observed, and the relief valve opened at 2.5 PSID.
During the next step, the bypass hose is bled and attached to no.4 test cock. The No.4
test cock is opened. The low side of the field test kit is bled. And the bypass control
needed valve is opened. When the bypass control needle valve is opened the reading
on the field kit drop from 6.5 PSID to 4.2 PSID and hold steady. - Correct Answers -A.
Why does this Occur?
-This may be due to disc compression of the second check valve
B.What is the next step?
Record the no.2 check valve as closed tight
While Field testing the air inlet valve of the pressure vacuum Breaker Backsiphonage
prevention assembly, you record a reading of 1.9 PSID when the air inlet valve opens. -
Correct Answers -A. What is the condition of the air inlet valve?
-The air inlet valve is working properly
B.What is the next step?
-Remove hose from no.2 test cock, and drain water from the body to determine if the air
inlet valve fully opens
While field testing the check valve of the pressure vacuum breaker backsiphonage
prevention assembly, water continues to flow from the No.2 test cock once the NO.2
test cock is opened. - Correct Answers -A. What is the condition?
-The no.1 SOV is leaking
B.What is the next step?
-Compensate for the leak by opening the bleed valve on the no.1 test cock
While field testing the Pressure Vacuum breaker Backsiphonage Prevention Assembly
the air inlet valve opens after the No.2 and No.1 shutoff valve are closed. - Correct
Answers -A. What is the condition of the assembly?
- There is a leaking No.2 shutoff valve
