The Watts LF957RPDA-OSY-CFM-FS 4 is a 4" 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 4 inch lead free reduced pressure detector backflow preventer assembly help stop the reverse flow of liquids due to backpressure or backsiphonage, where potential health hazard exists. Extremely compact and lighter than traditional designs it is approved for horizontal pattern installation. This assembly consists of a stainless steel body with a quick access sleeve, torsion spring check valves, outside stem and yoke resilient seated gate valves, test cocks, corrosive resistant bottom mounted pressure relief valve, and comes furnished with a cubic per minute meter to detect underground leaks and unauthorized water use. This backflow assembly contains a flood sensor with SentryPlus Alert® technology to detect excessive water discharges from the relief valve. When paired with an add on connection kit, the sensor is activated to relay alerts for potential flooding events. Connection kit options include BMS, cellular communication, and the Sensor Control Monitor which enables integration with BAS via RS-485 Modbus or the Nexa® platform through Wi-Fi.
Features
- Features a flood sensor with SentryPlus Alert technology to detect continuous discharge from the relief valve
- Add-on sensor connection kit to extend flood monitoring on compatible assemblies
- Integrates with the Sensor Control Monitor to deliver maintenance alerts to BAS via RS-485 Modbus or the Nexa platform by Wi-Fi connectivity
- 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
- Compact construction for smaller enclosures
- Bottom mounted relief valve reduces clearance requirements when installed against an outside wall
- Includes: Test Cocks
- Includes: Flood Sensor
Common Questions
- What hazard level is this RPDA approved for?
- It is rated for high health hazard (toxic) cross-connections, so it may be used on either high or low hazard service. 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.
- How does this have to be installed?
- It is approved for horizontal installation only, with the flow arrow on the body pointing in the direction of flow.
- 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. This model includes the SentryPlus Alert flood sensor, which signals a relief-valve discharge before it becomes a flood.
Specifications
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Type: RPZ
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Size: 4"
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Inlet Size: 4"
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Outlet Size: 4"
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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: Both
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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: LF957RPDA-OSY-CFM-FS 4
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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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Approved Orientation: Horizontal
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Flood Sensor (SentryPlus Alert): Yes
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Strainer Included: No
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Air Gap Fitting Included: No
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Bypass Meter: CFM
