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Easy-Maintenance Threaded Two-Stage Backflow-Prevention Valves for Drinking Water
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Reduced Pressure Zone |
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—Reduced-pressure-zone valves have a relief valve that discharges backflow if both check valves fail.
Air Inlet—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 @ Temp. | Min. Opening Pressure, psi | Temp. Range, ° F | End-to-End Lg. | Features | Specs. Met | Food Industry Std. | Certification | For Use With | Seal Material | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Bronze Body—Reduced Pressure Zone | ||||||||||||||
NPT Female Inlet × NPT Female Outlet | ||||||||||||||
| 1/2 | 175 psi @ 180° F | 30 | 35 to 180 | 12 3/4" | Relief Valve, Strainer | ASSE 1013 | NSF/ANSI 61 | USC Foundation Approved | Drinking Water | Buna-N | 47845K25 | 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 | Drinking Water | Buna-N | 4777K81 | 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 | Drinking Water | Buna-N | 45265K41 | 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 | Drinking Water | Buna-N | 4777K82 | 00000000 | ||
| 1 | 175 psi @ 180° F | 30 | 35 to 180 | 18 1/4" | Relief Valve, Strainer | ASSE 1013 | NSF/ANSI 61 | USC Foundation Approved | Drinking Water | Buna-N | 45265K42 | 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 | Drinking Water | Buna-N | 45265K43 | 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 | Drinking Water | Buna-N | 45265K44 | 00000000 | ||
| 2 | 175 psi @ 180° F | 30 | 35 to 180 | 26 11/16" | Relief Valve, Strainer | ASSE 1013 | NSF/ANSI 61 | USC Foundation Approved | Drinking Water | Buna-N | 45265K45 | 00000000 | ||
NPT Male Inlet × NPT Male Outlet | ||||||||||||||
| 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 | Drinking Water | Buna-N | 4777K83 | 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 | Drinking Water | Buna-N | 4777K84 | 00000000 | ||
