Backflow Prevention & Cross-Connection Control | Questions and Correct Answers | Latest 2025/2026 | Graded A+

Backflow Prevention and Cross
Connection Control Questions
and Answers Latest 2025/2026
GRADED A+
Relief valve discharges continuously. Problem May be caused by what 5
faults?
- ANS - 1. Faulty No. 1 check valve (F1CV)

2. Faulty No. 2 check valve with backpressure (F2CVwB)

3. Faulty relief valve (FRV)

4. Relief valve plugged sensing |ine(s) (RVPSL)

5. Relief Valve leaking diaphragm (RVLD)



Relief valve discharges intermittently. Problem May be caused by what 4
faults?
- ANS - 1. Properly working assembly with large pressure fluctuations

2. No.1 check valve reading is close to RV opening point, with small line
pressure fluctuation.

3. Water hammer

4. No. 1 check valve leak with intermittent flow through assembly.

, During RP Test 1, Relief Valve discharges after No. 2 shutoff valve is
closed. What does this indicate?
- ANS - 1. Normally indicates faulty No. 1 check valve

• Dirty or damaged disc

• Dirty or damaged seat: or,

2. Leak through relief valve diaphragm



During RP Test 1, Relief valve would not open; differential on the field
test kit would not drop. What does this indicate?
- ANS - 1. Leaky No. 2 shutoff valve with flow through the assembly
(L2SVwF)



During RP Test 1, Relief valve would not open, differential drops to zero.
What does this indicate?
- ANS - 1. Relief valve stuck closed due to corrosion or scale (RVSC).

2. Relief valve sensing line(s) plugged.



During RP Test 1, Relief valve opens too high (with sufficiently high No. 1
check reading). What does this indicate?
- ANS - 1. Faulty relief valve

• Dirty or damaged disc

• Dirty or damaged seat



During RP Test 1 or 3, Check Valve No. 1 check reading too low (less than
5.0). What does this indicate?
- ANS - 1. Dirty or damaged disc

2. Dirty or damaged seat