4 LF957NRPDA-OSY-GPM

Item Number: 0124745
  • 4 LF957NRPDA-OSY-GPM
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$13,917.28
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 4 inch
  • Weight: 266.0 lb
  • Construction: Lead Free
  • Housing Material: 304 Stainless Steel
  • Shutoff Valves: OSY Resilient Seated Gate Valves
  • Installation Pattern: Horizontal N-Pattern
  • Maximum Working Pressure: 175 PSI
  • Includes: Gallons/Minute Meter for Leak Detection
  • Approvals: ASSE 1047, CSA B64.4, UL Classified, FM Approved

Description

This Watts 4-inch Lead Free Reduced Pressure Detector Backflow Preventer Assembly (Series LF957RPDA) provides critical protection for potable water systems. It prevents contamination from backsiphonage and backpressure in health hazard applications like fire sprinkler systems, complying with national plumbing codes. The assembly features durable 304 stainless steel housing, UL and FM approved OSY shutoff valves, and a compact, lighter design. A built-in gallons/minute meter helps detect leaks and unauthorized water use, enhancing system integrity and reducing potential damage. Rated for 175 PSI and suitable for horizontal N-pattern installation. Item number 0124745.

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Connections

  • This assembly features groove end connections for integral pipeline adjustment.
  • Equipped with Outside Stem and Yoke (OSY) resilient seated gate valves for secure shutoff.
  • Designed for horizontal N pattern installation to align with specific piping layouts.
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Additional Details

This 4 inch Lead Free Reduced Pressure Detector Backflow Preventer Assembly safeguards potable water systems from contamination caused by backsiphonage and backpressure, in accordance with national plumbing codes and water authority requirements. It is commonly used in health hazard applications, such as on fire sprinkler systems, and monitors for unauthorized water use. This assembly is approved for horizontal N pattern installation and includes OSY shutoff valves and a gallons per minute meter.

Construction & Design

  • Features Lead Free construction, ensuring the wetted surface contains less than 0.25% lead by weight
  • Extremely compact design, approximately 70% lighter than traditional designs
  • Housing and sleeve are constructed from 304 (Schedule 40) stainless steel for durability
  • Groove fittings allow for integral pipeline adjustment
  • Patented torsion spring check provides the lowest pressure loss
  • Designed for unmatched ease of serviceability
  • Equipped with replaceable check disc rubber
  • Includes a bottom-mounted cast stainless steel relief valve
  • Metered bypass with a gallons per minute meter detects leakage or theft of water from the fire sprinkler system
  • Features a sensor on the relief valve for flood detection, signaling excessive water discharges

Specifications

  • Size: 4 inch
  • Construction: Lead Free
  • Housing & Sleeve Material: 304 (Schedule 40) Stainless Steel
  • Elastomers: EPDM, Silicone, Buna 'N'
  • Torsion Spring Checks Material: Noryl®, Stainless Steel
  • Check Discs Material: Reversible Silicone or EPDM
  • Test Cocks Material: Lead Free* Bronze Body
  • Pins & Fasteners Material: 300 Series Stainless Steel
  • Springs Material: Stainless Steel
  • Shutoff Valves: OSY (Outside Stem and Yoke) Resilient Seated Gate Valves
  • Installation Pattern: N-Pattern
  • Meter Type: Gallons/Minute
  • Temperature Range: 33°F-110°F (0.5°C-43°C)
  • Maximum Working Pressure: 175 PSI (12.1 bar)

Certificates & Approvals

  • Approved by: Foundation for Cross-Connection Control and Hydraulic Research at The University of Southern California (FCCCHR-USC)
  • Standard: AWWA C511-97
  • Certified to: ASSE 1047
  • Certified to: CSA B64.4
  • Approved: UL Classified (BFG & OSY Only)
  • Approved: FM Approved (BFG & OSY Only)
  • Certified to: NSF/ANSI 372

FAQs

What is the primary purpose of this backflow preventer?

This 4-inch Lead Free Reduced Pressure Detector Backflow Preventer Assembly is designed to protect potable water systems from contamination caused by backsiphonage and backpressure, especially in health hazard applications like fire sprinkler systems.

What does "Lead Free" construction mean for this product?

"Lead Free" construction indicates that the wetted surface of this product, which comes into contact with consumable water, contains less than 0.25% of lead by weight, meeting current lead-free installation requirements.

What are the maximum operating pressure and temperature limits for this assembly?

This backflow preventer has a maximum working pressure of 175 PSI (12.1 bar) and an operating temperature range of 33°F-110°F (0.5°C-43°C).

What type of shutoff valves are included with this backflow preventer?

The assembly is equipped with UL Classified and FM Approved Outside Stem and Yoke (OSY) resilient seated gate valves, which are designed for secure and reliable shutoff.

How does the included gallons per minute meter function?

The integral gallons per minute meter in the metered bypass assembly is designed to detect small leaks or unauthorized water usage from the fire sprinkler system, helping to prevent water loss and potential damage.

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