The Watts LF957-RPDA-OSY-CFM 2 1/2 is a 2-1/2" lead-free reduced pressure detector assembly (RPDA) with Flanged connections, approved for high health hazard protection. It features a stainless body and a silicone seat. Rated to 175 psi and 33°F to 110°F. This model is certified lead-free for potable-water installations.
This 2 1/2 inch lead free testable reduced pressure detector backflow preventer assembly prevents the reverse flow of fire protection system substances from being pumped or siphoned into the potable water supply. It incorporates a meter to detect ground leaks and unauthorized illegal taps, greatly reducing annual water expenses. It consists of a compact, stainless steel body with stainless steel internal parts, two check valves, a pressure-differential relief valve, shutoff valves, torsion spring checks and relief valve, and bronze nickel plated test cocks. It is 70 percent lighter than traditional designs and is ideal for health hazard cross-connection, such as on fire sprinkler systems. Maximum working pressure is 175 psi (12.06 bar).
Features
- Stainless steel for corrosion resistance
- UL and FM outside stem and yoke resilient seated gate valves
- 150 pound ANSI/AWWA CL D flanged
- Outside screw and yoke shutoffs
- Includes: Test Cocks
Common Questions
- What hazard level is this RPDA approved for?
- It is rated for high health hazard (toxic) cross-connections, but only against backpressure. The assembly is listed to ASSE 1047.
- Is this model legal for potable water?
- Yes. It is certified lead-free to NSF/ANSI 372, which is what state plumbing codes require for any device in a drinking-water line.
- Does this assembly have to be tested every year?
- Yes. This is a field-testable assembly. Most water authorities require it to be tested and certified by a licensed backflow tester at installation and annually thereafter. It carries USC FCCCHR approval, which many jurisdictions accept as their sole approval list.
- What shutoff valves are included?
- It is supplied with outside screw and yoke (OS&Y) gate valves on the inlet and outlet. OS&Y gates give the visible open/shut indication that fire-line and many water-authority specs require.
- Is this suitable for a fire sprinkler line?
- Yes. Detector assemblies are built for fire sprinkler service: the metered bypass registers the low flows that reveal a leak or an unauthorized tap on the fire line. This model is UL Classified and FM Approved. The bypass meter reads in CFM.
- Does the relief valve need a drain?
- Yes. An RPZ relief valve is designed to discharge, and it can dump a large volume of water, so it must never be installed in a pit or below grade and the discharge must be piped to an adequate drain through an air gap. The air gap fitting is not included with this model and is ordered separately.
Specifications
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Type: RPZ
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Size: 2-1/2"
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Inlet Size: 2-1/2"
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Outlet Size: 2-1/2"
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Connection: Flanged
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Body Material: Stainless
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Seat / Seal Material: Silicone
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Max Pressure (psi): 175
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Application: Fire Protection
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Backflow Protection: Backpressure
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Operation: Continuous
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Country of Origin: United States
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Warranty: 1 Year Limited
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MPN: LF957-RPDA-OSY-CFM 2 1/2
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Temperature: 33°F to 110°F
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Certifications: UL, FM, USC
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Lead-Free: Yes
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Assembly Type: RPDA
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Hazard Protection Level: High Health Hazard
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ASSE Standard: ASSE 1047
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USC FCCCHR Approved: Yes
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Fire Protection Listing: UL Classified;FM Approved
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Field Testable: Yes
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Shutoff Valves: OSY Gate
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Flood Sensor (SentryPlus Alert): No
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Strainer Included: No
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Air Gap Fitting Included: No
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Bypass Meter: CFM
