8 LF957NRPDA-OSY-GPM
Item Number: 0124747
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$30,218.25
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Brand - Watts
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- 8 inch Lead Free* Reduced Pressure Detector Assembly
- Weight: 523.0 lb
- UL Classified and FM Approved OSY Shutoff Valves
- 304 (Schedule 40) Stainless Steel Housing & Sleeve
- Gallons Per Minute Meter for Leak Detection
- Maximum Working Pressure: 175 psi
- Temperature Range: 33°F - 110°F
- Extremely compact and 70% lighter design
- Approved for horizontal N-pattern installation
Description
Description
This 8 inch Watts Lead Free* Reduced Pressure Detector Backflow Preventer Assembly, Model LF957NRPDA-OSY-GPM, prevents contamination of potable water systems from backsiphonage or backpressure, particularly for health hazard cross-connections like fire sprinkler systems. It features a compact, lightweight 304 stainless steel housing, UL Classified and FM Approved OSY shutoff valves, and an N-pattern configuration for horizontal installation. A built-in gallons per minute meter detects leaks and unauthorized water use, while a relief valve flood sensor enhances system monitoring. This assembly operates up to 175 psi and is constructed with lead-free* materials. Item number 0124747.
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Connections
- This 8 inch reduced pressure detector backflow preventer assembly is designed with **groove end connections** for secure installation and integral pipeline adjustment.

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Additional Details
This 8 inch Lead Free* Reduced Pressure Detector Backflow Preventer Assembly protects potable water systems from contamination in accordance with national plumbing codes.
It is designed to prevent the reverse flow of fire protection substances and water of non-potable quality from being pumped or siphoned into the supply due to backsiphonage and/or backpressure in health hazard applications, such as on fire sprinkler systems.
Key Features
- Lead Free* construction with wetted surfaces containing less than 0.25% lead by weight.
- Extremely compact design and 70% lighter than traditional models for easier installation.
- Constructed with a 304 (Schedule 40) stainless steel housing and sleeve for durability.
- Features UL Classified and FM Approved outside stem and yoke (OSY) resilient seated gate valves.
- Patented torsion spring checks provide the lowest pressure loss and feature reversible elastomer discs and replaceable check disc rubber.
- Groove fittings allow for integral pipeline adjustment.
- Includes a gallons per minute meter in the bypass assembly to detect underground leaks and unauthorized water usage from the fire sprinkler system.
- A flood sensor is integrated into the relief valve to detect excessive water discharges. An add-on connection kit is required to activate the flood sensor and enable flood alerts with BMS and cellular network communication. Without the connection kit, the sensor is a passive component.
Specifications
- Product Type: Reduced Pressure Detector Backflow Preventer Assembly
- Size: 8 inch
- Pattern: N-Pattern (Horizontal Installation)
- Shutoff Valves: Outside Stem and Yoke (OSY) Resilient Seated Gate Valves
- Meter: Gallons Per Minute (GPM)
- Housing & Sleeve Material: 304 (Schedule 40) Stainless Steel
- Elastomer Material: EPDM, Silicone, and Buna 'N'
- Torsion Spring Check Material: Noryl®, Stainless Steel
- Check Disc Material: Reversible Silicone or EPDM
- Test Cock Material: Lead Free* Bronze Body
- Pins & Fasteners Material: 300 Series Stainless Steel
- Spring Material: Stainless Steel
- Relief Valve Type: Corrosive Resistant Bottom Mounted Differential Pressure
- Maximum Working Pressure: 175 psi (12.1 bar)
- Temperature Range: 33°F - 110°F (0.5°C - 43°C)
- Weight: Approximately 362 lbs
Certificates & Approvals
- AWWA C511-97
- ASSE 1047
- CSA B64.4
- UL Classified (for OSY)
- FM Approved (for OSY)
- NSF Certified to NSF/ANSI 372
FAQs
What is the primary purpose of this backflow preventer assembly?
This assembly is designed to protect potable water systems from contamination by preventing the reverse flow of non-potable water or fire protection substances due to backsiphonage or backpressure, especially in health hazard applications like fire sprinkler systems.
Is this backflow preventer compliant with lead-free requirements?
Yes, it features Lead Free* construction, meaning all wetted surfaces that come into contact with consumable water contain less than 0.25% lead by weight, complying with Lead Free* installation requirements.
What type of shutoff valves does this model use?
This model is equipped with UL Classified and FM Approved outside stem and yoke (OSY) resilient seated gate valves, which are crucial for isolation during maintenance and testing.
How does the integrated flood sensor function?
The flood sensor is installed on the relief valve to detect excessive water discharges. To activate its flood alert feature, an add-on connection kit is required, enabling compatibility with BMS and cellular network communication.
What is the maximum operating pressure and temperature range for this assembly?
This assembly has a maximum working pressure of 175 psi (12.1 bar) and operates efficiently within a temperature range of 33°F to 110°F (0.5°C to 43°C).
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