Which statement about a double check valve backflow assembly is true?

Which statement about a double check valve backflow assembly is true?

• A. A double check valve is designed to stop backsiphonage of a health hazard
• B. It provides no protection against backflow
• C. It is the same as a reduced pressure principle backflow assembly
• D. A double check valve is not designed to stop backsiphonage of a health hazard

Answer: (D)

Backflow prevention devices are matched to how severe a contaminant risk they must stop. A double check valve assembly uses two check valves in series to prevent reverse flow and protect against backflow caused by backsiphonage or backpressure, but its protection is limited to non-health-hazard situations. It is not designed to stop backsiphonage of a health hazard; for substances that could cause illness, a more protective device is required, such as a reduced pressure principle backflow assembly. The other statements overstate or misstate its capabilities: it does provide protection against backflow (just not for health hazards), it’s not the same as an RPZ, and it isn’t designed to stop backsiphonage of health hazards.

Backflow prevention devices are matched to how severe a contaminant risk they must stop. A double check valve assembly uses two check valves in series to prevent reverse flow and protect against backflow caused by backsiphonage or backpressure, but its protection is limited to non-health-hazard situations. It is not designed to stop backsiphonage of a health hazard; for substances that could cause illness, a more protective device is required, such as a reduced pressure principle backflow assembly. The other statements overstate or misstate its capabilities: it does provide protection against backflow (just not for health hazards), it’s not the same as an RPZ, and it isn’t designed to stop backsiphonage of health hazards.