4 LF757NDCDA-OSY-GPM

Item Number: 0124700
1 1
$14,448.37
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When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Nominal Size: 4 inch
  • Weight: 263.0 lb
  • Assembly Type: Double Check Detector Backflow Preventer
  • Shutoff Valves: UL/FM OSY Resilient Seated Gate Valves
  • Meter Type: Gallons per minute (GPM)
  • Body Material: 304 Schedule 40 Stainless Steel
  • Maximum Working Pressure: 175 PSI
  • Lead Free: Yes (wetted surface less than 0.25% lead)
  • Installation: Horizontal, Vertical, N-Pattern

Description

The Watts 4 inch Lead Free Double Check Detector Backflow Preventer Assembly, SKU 0124700, prevents non-health hazard pollutants from entering potable water supply systems. This unit is ideal for fire sprinkler lines, where it also monitors unauthorized water use with its integrated gallons per minute meter. Constructed from durable 304 Schedule 40 stainless steel, it is 70% lighter and features a compact design. It offers a maximum working pressure of 175 PSI and is approved for horizontal, vertical, or N pattern installations. This assembly includes UL/FM OSY shutoff valves and tri-link spring checks for low pressure loss and easy service.

Help Me Connect

Connection Type

  • This assembly features groove end connections for integral pipeline adjustment and simplified installation into 304 Schedule 40 stainless steel pipe systems.

Installation Orientation

  • The unit is approved for installation in horizontal, vertical, or N pattern configurations, providing flexibility for various piping layouts.

Shutoff Valves

  • Includes UL/FM outside stem and yoke (OSY) resilient seated gate valves for secure and reliable system isolation.
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Additional Details

This 4 inch Lead Free Double Check Detector Backflow Preventer Assembly, featuring OSY shutoff valves and a gallons per minute meter, is designed to prevent the backflow of non-health hazard pollutants into potable water supply systems. It is primarily used on fire sprinkler lines to monitor unauthorized water usage and is suitable for continuous pressure service against backpressure and backsiphonage.

Features & Construction

  • Lead Free construction ensures the wetted surface contains less than 0.25% lead by weight.
  • Extremely compact design, up to 70% lighter than traditional backflow preventers.
  • Durable 304 Schedule 40 stainless steel housing and sleeve.
  • Equipped with UL/FM outside stem and yoke (OSY) resilient seated gate valves.
  • Includes a gallons per minute meter for monitoring water flow.
  • Groove fittings allow for integral pipeline adjustment.
  • Unique tri-link spring checks offer lowest pressure loss and unmatched ease of serviceability.
  • Approved for horizontal, vertical, or N pattern installations.
  • Features reversible elastomer discs for drip-tight closure.

Specifications

  • Nominal Size: 4 inch
  • Assembly Type: Double Check Detector Backflow Preventer
  • Shutoff Valves: UL/FM OSY Resilient Seated Gate Valves
  • Meter Type: Gallons per minute (GPM)
  • Body Material: 304 Schedule 40 Stainless Steel
  • Sleeve Material: 304 Schedule 40 Stainless Steel
  • Check Module Material: Noryl®, Stainless Steel
  • Check Disc Material: Reversible Silicone or EPDM
  • Elastomers: EPDM, Silicone, Buna-N
  • Test Cocks: Lead Free Bronze Body
  • Pins & Fasteners: 300 Series Stainless Steel
  • Spring Material: Stainless Steel
  • Maximum Working Pressure: 175 PSI (12.1 bar)
  • Temperature Range: 33°F – 140°F (0.5°C – 60°C)
  • Lead Free: Yes (wetted surface less than 0.25% lead)
  • Installation Pattern: Horizontal, Vertical, N-Pattern

Certificates & Approvals

  • Approved by the Foundation for Cross-Connection Control and Hydraulic Research at The University of Southern California (FCCCHR-USC)
  • AWWA C510-97
  • ASSE 1048
  • CSA B64.5
  • CULUS
  • FM Approved
  • NSF Certified to NSF/ANSI 372

FAQs

What type of backflow does this assembly prevent?

This assembly prevents the backflow of non-health hazard pollutants, which are objectionable but not toxic, from entering potable water supply systems. It protects against both backpressure and backsiphonage.

What is the primary use of this backflow preventer?

It is primarily used on fire sprinkler lines where it is necessary to monitor unauthorized water use. The assembly includes a gallons per minute meter for this purpose.

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% lead by weight.

Can this backflow preventer be installed in different orientations?

Yes, this backflow preventer is approved for installation in horizontal, vertical, or N pattern configurations, offering flexibility for various piping layouts.

What kind of shutoff valves are included with this assembly?

The assembly includes UL/FM outside stem and yoke (OSY) resilient seated gate valves, which are designed for secure and reliable system isolation.

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