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Backflow Prevention and Cross Connection Control QUESTIONS AND CORRECT ANSWERS GRADED A+ 2024/2025
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Backflow Prevention and Cross Connection Control QUESTIONS AND CORRECT ANSWERS GRADED A+ 2024/2025
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Backflow Prevention and CrossConnection Control
Relief valve discharges constantly. Problem May be caused by what 5 faults? - ANS1. Faulty
No. 1 check valve (F1CV)
2. Faulty No. 2 test valve with backpressure (F2CVwB)
three. Faulty relief valve (FRV)
4. Relief valve plugged sensing five. Relief Valve leaking diaphragm (RVLD)
Relief valve discharges intermittently. Problem May be caused by what four faults? - ANS1.
Properly running assembly with massive stress fluctuations
2. No.1 test valve analyzing is near RV establishing point, with small line strain fluctuation.
3. Water hammer
four. No. 1 check valve leak with intermittent glide via assembly.
During RP Test 1, Relief Valve discharges after No. 2 shutoff valve is closed. What does this
suggest? - ANS1. Normally shows faulty No. 1 test valve
• Dirty or damaged disc
• Dirty or damaged seat: or,
2. Leak via comfort valve diaphragm
During RP Test 1, Relief valve might now not open; differential on the sphere test kit would
not drop. What does this indicate? - ANS1. Leaky No. 2 shutoff valve with go with the flow
via the assembly (L2SVwF)
During RP Test 1, Relief valve might not open, differential drops to zero. What does this
indicate? - ANS1. Relief valve caught closed because of corrosion or scale (RVSC).
2. Relief valve sensing line(s) plugged.
During RP Test 1, Relief valve opens too excessive (with sufficiently excessive No. 1 check
studying). What does this indicate? - ANS1. Faulty relief valve
• Dirty or damaged disc
• Dirty or broken seat
During RP Test 1 or 3, Check Valve No. 1 take a look at analyzing too low (less than five.0).
What does this imply? - ANS1. Dirty or damaged disc
2. Dirty or broken seat
3. Guide members hanging up
4. Damaged spring
During RP Test 2, Check Valve No. 2 is Leaking. What does this imply? - ANS1. Dirty or
damaged CV 2 disc
2. Dirty or broken CV 2 seat
3. CV2 guide contributors putting up
, NOTE: Lubricants have to simplest be used to assist with the reassembly of additives, and
must be non-poisonous.
During DC Test for either take a look at valve, the Check valve is analyzing below 1.Zero
psid. What does this imply? - ANS1. Dirty or broken check disc
2. Dirty or damaged take a look at seat
three. Damaged spring
During DC Test for either check valve, the Check valve studying above five.Zero psid psid.
What does this indicate? - ANS1. Incorrect CV spring, feasible RP spring.
During PVB Air Inlet Test, Air inlet valve does not open, as field check kit drops to zero.Zero
psid. What does this imply? - ANS1. Air inlet disc stuck to seat
2. Broken or missing air inlet spring
three."Ostyle" strain vacuum breaker (non- loaded air inlet valve)
four. It is an SVB (See Book nine.5)
During PVB Air Inlet Test, Air inlet valve does no longer open, and studying on subject check
package will now not drop. What does this imply? - ANS1. Leaky No. 1 shutoff valve
2. Parallel set up with leaky No. 2 shutoff valve
During PVB Air Inlet Test, Air inlet valve opens under 1.0 psid, and studying on field check
package will not drop. What does this indicate? - ANS1. Dirty or damaged air inlet valve disc
2. Scale buildup on seat
three. Damaged spring
During PVB Check Valve Test, Check valve studying under 1.0 psid. What does this
suggest? - ANS1. Dirty or broken test valve disc
2. Dirty or damaged seat
three. Damaged spring
During PVB Check Valve Closing Point Test (Test No. 2), water runs continuously from take
a look at cock No. 2. What does this indicate? - ANS1. Leaky No. 1 shutoff valve
During SVB (Either) Test, air inlet valve does not open, as field take a look at package drops
to zero.0 psid. What does this imply? - ANS1. Air inlet disc caught to seat
2. Broken or lacking air inlet spring
three. Parallel set up with leaky No.2 shutoff valve
4. PVB not SVB
During SVB (Either) Test, Air inlet valve does now not open, and studying on discipline take
a look at kit will no longer drop. What does this indicate? - ANS1. Leaky No. 1 shutoff valve
During SVB (Either) Test, Air inlet opens underneath 1.0 psid. What does this imply? - ANS1.
Dirty or broken air inlet disc
During SVB (Check Valve Closing Point) Test 1, Check valve reading beneath 1.Zero psid.
What does this suggest? - ANS1. Dirty or damaged check disc
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