4 LF757DCDA-BFG-GPM

Item Number: 0122736
1 1
$9,229.29
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When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Product Type: Double Check Detector Backflow Preventer Assembly
  • Weight: 65.0 lb
  • Nominal Pipe Size: 4 inch
  • Housing Material: 304 Stainless Steel
  • Maximum Working Pressure: 175 PSI
  • Shutoff Valves: UL/FM Grooved Gear Operated Butterfly
  • Bypass Meter: Gallons/Cubic Measurement
  • Lead Free* Construction
  • Approved by ASSE 1048, AWWA C510-97, CSA B64.5, cULus, FM, NSF/ANSI 372

Description

This 4 inch Lead Free Double Check Detector Backflow Preventer Assembly (LF757DCDA-BFG) is engineered to protect potable water supplies from non-health hazard pollutants. Designed primarily for fire sprinkler systems, it features a durable 304 stainless steel housing and sleeve, making it 70% lighter than traditional designs. It includes UL/FM grooved gear operated butterfly valve shutoffs with tamper switches and a bypass meter for monitoring unauthorized water use in gallons or cubic measurement. With a maximum working pressure of 175 PSI, this compact unit offers unmatched serviceability and can be installed horizontally, vertically, or in an N pattern. Item number 0122736.

Help Me Connect

Connections

  • This assembly features grooved end connections, designed for integral pipeline adjustment and secure installation into your piping system.
  • The gear operated butterfly valve shutoffs are UL/FM approved for reliable operation.
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Additional Details

This 4 inch Lead Free Double Check Detector Backflow Preventer Assembly is designed to prevent the backflow of non-health hazard pollutants from entering the potable water supply system.

It is primarily used in fire line sprinkler systems where monitoring unauthorized water use is necessary, protecting against backpressure and backsiphonage under continuous pressure service.

Features

  • Lead Free* construction, with wetted surfaces containing less than 0.25% lead by weight
  • 304 (Schedule 40) stainless steel housing and sleeve for corrosion resistance
  • Extremely compact design, 70% lighter than traditional assemblies
  • Grooved end connections for integral pipeline adjustment
  • Equipped with UL/FM grooved gear operated butterfly valve shutoffs with tamper switches
  • Unique tri-link spring check design provides lowest pressure loss
  • Unmatched ease of serviceability with removable and serviceable check modules
  • Bypass assembly includes a meter which registers in gallons or cubic measurement
  • May be used for horizontal, vertical, or N pattern installations
  • Replaceable check disc rubber

Specifications

General

  • Product Type: Double Check Detector Backflow Preventer Assembly
  • Series: LF757DCDA
  • Nominal Pipe Size: 4 inch
  • Application: Non-health hazard backflow prevention for potable water
  • Usage: Fire line sprinkler systems, continuous pressure service, backpressure and backsiphonage protection

Materials

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

Performance

  • Maximum Working Pressure: 175 PSI (12.1 bar)
  • Temperature Range: 33°F – 140°F (0.5°C – 60°C)

Connections & Shutoffs

  • End Connections: Grooved
  • Shutoff Valves: UL/FM Grooved Gear Operated Butterfly Valve Shutoffs with Tamper Switches

Bypass Assembly

  • Meter: Gallons or Cubic Measurement
  • Backflow Assembly: Double Check

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 (for BFG and OSY configurations)
  • FM Approved (for BFG and OSY configurations)
  • NSF Certified to NSF/ANSI 372

Dimensions (Approximate for 4 inch LF757DCDABFG)

  • Overall Length (A): 29 inches (737 mm)
  • Height (C, BFG): 8 15/16 inches (227 mm)
  • Width (D): 3 11/16 inches (94 mm)
  • Overall Length (G): 31 15/16 inches (811 mm)
  • Height (H): 23 1/2 inches (597 mm)
  • Depth (J): 16 1/4 inches (412 mm)
  • Centerline to Bottom (P): 14 inches (356 mm)
  • Weight: 75 lbs (34 kgs)

FAQs

What is the primary application of this backflow preventer assembly?

This assembly is primarily used on fire line sprinkler systems to prevent the backflow of non-health hazard pollutants into the potable water supply. It also monitors unauthorized water usage.

What is the maximum operating pressure and temperature range for this device?

The maximum working pressure for this backflow preventer is 175 PSI (12.1 bar). It operates effectively within a temperature range of 33°F to 140°F (0.5°C to 60°C).

Is this backflow preventer assembly compliant with "Lead Free" requirements?

Yes, this assembly features Lead Free* construction, meaning the wetted surface contacted by consumable water contains less than 0.25% of lead by weight, meeting regulatory standards.

What type of shutoff valves are included with this assembly?

This assembly comes with UL/FM approved grooved gear operated butterfly valve shutoffs, which also include tamper switches for enhanced security and monitoring.

Can this backflow preventer be installed in different orientations?

Yes, the LF757DCDA series is designed for versatile installation and may be used for horizontal, vertical, or N pattern installations.

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