About Backflow-Prevention Valves
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Easy-Maintenance Threaded Two-Stage
Backflow-Prevention Valves for Drinking Water
- For Use With: Drinking Water
- Seal Material: Buna-N Rubber
Integral shutoff valves isolate flow for inline maintenance, and a top-entry cover provides easy access to internal components. These valves meet NSF/ANSI 61 for use with drinking water. For maximum protection from system contamination, they consist of a primary check valve and a secondary check valve. If the first check fails to close when flow stops or reverses, the secondary check valve engages to prevent backflow. A strainer prevents debris from blocking the check valves.
Reduced-pressure-zone valves have a relief valve that discharges backflow if both check valves fail. Valves with an air inlet provide high-capacity relief in emergency conditions. If both check valves fail, the inlet introduces air to quickly displace liquid for faster discharge through the relief valve.
| Pipe Size  | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | End-to-End Lg. | Features | Specifications Met | Each | |
Bronze Body—Reduced-Pressure-Zone Valve | ||||||||
|---|---|---|---|---|---|---|---|---|
NPT Female × NPT Female | ||||||||
| 1/2 | 175 psi @ 180° F | 30 | 35° to 180° | 12 3/4" | Relief Valve, Strainer | ASSE 1013, NSF/ANSI 61, USC Foundation Approved | 00000000 | 0000000 |
| 3/4 | 175 psi @ 140° F | 30 | 35° to 140° | 18 1/16" | Air Inlet, Relief Valve, Strainer | ASSE 1013, NSF/ANSI 61, USC Foundation Approved | 0000000 | 00000000 |
| 3/4 | 175 psi @ 180° F | 30 | 35° to 180° | 16 15/16" | Relief Valve, Strainer | ASSE 1013, NSF/ANSI 61, USC Foundation Approved | 00000000 | 000000 |
| 1 | 175 psi @ 140° F | 30 | 35° to 140° | 19 5/8" | Air Inlet, Relief Valve, Strainer | ASSE 1013, NSF/ANSI 61, USC Foundation Approved | 0000000 | 00000000 |
| 1 | 175 psi @ 180° F | 30 | 35° to 180° | 18 1/4" | Relief Valve, Strainer | ASSE 1013, NSF/ANSI 61, USC Foundation Approved | 00000000 | 000000 |
| 1 1/4 | 175 psi @ 180° F | 30 | 35° to 180° | 21 13/16" | Relief Valve, Strainer | ASSE 1013, NSF/ANSI 61, USC Foundation Approved | 00000000 | 00000000 |
| 1 1/2 | 175 psi @ 180° F | 30 | 35° to 180° | 22 3/4" | Relief Valve, Strainer | ASSE 1013, NSF/ANSI 61, USC Foundation Approved | 00000000 | 00000000 |
| 2 | 175 psi @ 180° F | 30 | 35° to 180° | 26 11/16" | Relief Valve, Strainer | ASSE 1013, NSF/ANSI 61, USC Foundation Approved | 00000000 | 00000000 |
NPT Male × NPT Male | ||||||||
| 1 1/2 | 175 psi @ 140° F | 30 | 35° to 140° | 24 3/8" | Air Inlet, Relief Valve, Strainer | ASSE 1013, NSF/ANSI 61, USC Foundation Approved | 0000000 | 00000000 |
| 2 | 175 psi @ 140° F | 30 | 35° to 140° | 25 15/16" | Air Inlet, Relief Valve, Strainer | ASSE 1013, NSF/ANSI 61, USC Foundation Approved | 0000000 | 00000000 |