Plumber Red Seal · Question
A plumbing apprentice is observing the installation of a backflow prevention assembly in a new industrial facility. The plumber explains that the assembly has two independently operating check valves and a relief valve that opens to atmosphere when the pressure between the check valves drops below atmospheric pressure. Which type of backflow preventer is being described?
The description of two independently operating check valves and a relief valve that opens to atmosphere when the pressure in the zone between the check valves d
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Question: A plumbing apprentice is observing the installation of a backflow prevention assembly in a new industrial facility. The plumber explains that the assembly has two independently operating check valves and a relief valve that opens to atmosphere when the pressure between the check valves drops below atmospheric pressure. Which type of backflow preventer is being described?
Answer options:
- Pressure vacuum breaker (PVB)
- Atmospheric vacuum breaker (AVB)
- Double check valve assembly (DCVA) ✅ Reduced pressure principle backflow preventer (RP)
Correct answer: Reduced pressure principle backflow preventer (RP)
Explanation: The description of two independently operating check valves and a relief valve that opens to atmosphere when the pressure in the zone between the check valves drops below the supply pressure identifies a Reduced Pressure Principle Backflow Preventer (RP). This device offers superior protection against both backpressure and backsiphonage.
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