3 LF757DCDA-BFG-GPM

Item Number: 0122735
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$8,312.73
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 3 inch
  • Weight: 225.0 lb
  • Lead Free* construction
  • Housing Material: 304 Stainless Steel
  • Maximum Working Pressure: 175 PSI
  • Grooved butterfly valve shutoffs with tamper switches
  • Compact design, 70% lighter than traditional models
  • Monitors unauthorized water use for fire lines
  • Installation: Horizontal, vertical, or N pattern

Description

This 3 inch Watts LF757DCDA Series lead free double check detector backflow preventer assembly is designed to prevent non-health hazard pollutants from entering potable water supply systems. Ideal for fire sprinkler lines, it monitors unauthorized water use and protects against backpressure and backsiphonage. Featuring 304 Schedule 40 stainless steel housing, grooved end connections, and UL/FM approved butterfly valve shutoffs, it offers a compact, lightweight design with a maximum working pressure of 175 PSI. Its tri-link checks ensure low pressure loss and ease of serviceability.

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Connections

This Watts LF757DCDA/LF757NDCDA Double Check Detector Assembly features grooved end connections for easy and integral pipeline adjustment. It is equipped with grooved butterfly valve shutoffs that include tamper switches. The versatile design allows for installation in horizontal, vertical, or N pattern orientations, providing flexibility for various system configurations.

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Additional Details

This 3 inch Watts LF757DCDA Series lead free double check detector backflow preventer assembly prevents the backflow of non-health hazard pollutants from entering the potable water supply system. It is suitable for continuous pressure service against backpressure and backsiphonage, primarily used on fire sprinkler systems to monitor unauthorized water use.

Its compact housing features two independently operating tri-link check valves, two shutoff valves, and four test cocks, designed for robust performance.

Features

  • Lead Free* construction
  • Extremely compact design, 70% lighter than traditional designs
  • Housing and sleeve constructed from 304 Schedule 40 stainless steel
  • Groove fittings allow integral pipeline adjustment
  • Unique tri-link spring check provides lowest pressure loss
  • Unmatched ease of serviceability
  • Available with grooved butterfly valve shutoffs with tamper switches
  • May be used for horizontal, vertical or N pattern installations
  • Replaceable check disc rubber

Construction Materials

  • Housing & Sleeve: 304 (Schedule 40) Stainless Steel
  • Elastomers: EPDM, Silicone and Buna-N
  • Tri-link Checks: Noryl®, Stainless Steel
  • Check Discs: Reversible Silicone or EPDM
  • Test Cocks: Lead Free* Bronze Body
  • Pins & Fasteners: 300 Series Stainless Steel
  • Springs: Stainless Steel

Specifications

  • Nominal Size: 3 inch
  • Construction: Lead Free*
  • Housing & Sleeve Material: 304 (Schedule 40) Stainless Steel
  • Check Mechanism: Two independent tri-link check modules
  • Shutoff Valves: Two drip tight shutoff valves
  • Test Cocks: Four
  • Bypass Assembly: Meter (gallon or cubic measurement), double check backflow assembly, test cocks
  • Tri-link Checks Material: Noryl®, Stainless Steel
  • Check Discs Material: Reversible Silicone or EPDM
  • Elastomers: EPDM, Silicone, Buna-N
  • Test Cocks Body Material: Lead Free* Bronze
  • Pins & Fasteners Material: 300 Series Stainless Steel
  • Springs Material: Stainless Steel
  • Maximum Working Pressure: 175 PSI (12.1 bar)
  • Temperature Range: 33°F - 140°F (0.5°C - 60°C)

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 Classified
  • FM Approved
  • NSF Certified to NSF/ANSI 372

FAQs

What is the primary purpose of this 3-inch backflow preventer?

This 3-inch lead free double check detector backflow preventer assembly is primarily used to prevent non-health hazard pollutants from contaminating the potable water supply system. It is often installed on fire sprinkler lines where monitoring unauthorized water use is necessary.

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

The Watts LF757DCDA/LF757NDCDA assembly has a maximum working pressure of 175 PSI (12.1 bar). It can operate within a temperature range of 33°F to 140°F (0.5°C to 60°C).

What materials are used in the construction of this backflow preventer?

The housing and sleeve are constructed from 304 Schedule 40 stainless steel. Elastomers include EPDM, Silicone, and Buna-N. The tri-link checks are Noryl® and stainless steel, with reversible Silicone or EPDM check discs.

What types of shutoff valves are included and how does the bypass assembly work?

This assembly includes UL/FM approved grooved butterfly valve shutoffs with tamper switches. The bypass assembly features a meter that registers water usage in either gallons or cubic feet, along with a double check backflow assembly and required test cocks.

What installation orientations are supported for this backflow preventer?

This Watts backflow preventer can be installed in horizontal, vertical, or N pattern orientations, offering flexibility to suit various piping configurations and space requirements.

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