3 LF757DCDA-OSY-GPM

Item Number: 0122715
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$9,591.87
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Nominal Size: 3 inch
  • Weight: 210.0 lb
  • Lead Free* construction
  • Housing & Sleeve: 304 Schedule 40 Stainless Steel
  • Maximum Working Pressure: 175 PSI
  • Shutoff Valves: OSY (Outside Stem and Yoke)
  • Bypass Meter: Gallons per Minute
  • Installation: Horizontal, Vertical, or N pattern
  • 70% lighter than traditional designs

Description

This 3 inch Watts LF757DCDA Lead Free Double Check Detector Backflow Preventer Assembly is designed to safeguard potable water systems from non-health hazard pollutants. Primarily utilized in fire sprinkler lines to monitor unauthorized water use, it features a durable 304 Schedule 40 stainless steel housing and sleeve. The assembly is 70% lighter and more compact than traditional designs, making installation easier. It includes OSY shutoff valves, four test cocks, and a bypass meter for monitoring water flow. Approved by AWWA C510-97 and NSF Certified to NSF/ANSI 372, it offers a maximum working pressure of 175 PSI and is suitable for various installation patterns.

Help Me Connect

Connections

  • This assembly features groove end connections for integral pipeline adjustment.
  • The OSY (Outside Stem and Yoke) shutoff valves are UL/FM resilient seated gate valves.
  • Can be installed in horizontal, vertical, or N pattern orientations to suit various piping layouts.
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Additional Details

The 3 inch Watts LF757DCDA Lead Free Double Check Detector Backflow Preventer Assembly is designed to prevent the backflow of non-health hazard pollutants into potable water supply systems. This assembly is primarily used on fire line sprinkler systems where monitoring unauthorized water use is necessary.

It is suitable for continuous pressure service and protects against both backpressure and backsiphonage, featuring a compact design that is significantly lighter than traditional assemblies.

Key Features

  • Lead Free* construction ensures safety for consumable water applications.
  • Extremely compact design, 70% lighter than traditional backflow preventers.
  • Housing and sleeve constructed from 304 Schedule 40 stainless steel for durability and corrosion resistance.
  • Features a unique tri-link spring check design for lowest pressure loss and unmatched ease of serviceability.
  • Includes OSY (Outside Stem and Yoke) shutoff valves and four test cocks.
  • Equipped with a bypass assembly that includes a gallons per minute meter to monitor water usage.
  • May be installed in horizontal, vertical, or N pattern configurations.
  • *The wetted surface of this product contacted by consumable water contains less than 0.25% of lead by weight.

Specifications

  • Nominal Size: 3 inch
  • Model Series: LF757DCDA
  • Housing & Sleeve Material: 304 Schedule 40 Stainless Steel
  • Check Assembly: Two independent tri-link check modules
  • Check Discs: Reversible Silicone or EPDM
  • Tri-link Checks Material: Noryl®, Stainless Steel
  • Elastomers: EPDM, Silicone, Buna-N
  • Test Cocks: Lead Free* Bronze Body
  • Pins & Fasteners: 300 Series Stainless Steel
  • Springs: Stainless Steel
  • Shutoff Valves: OSY (Outside Stem and Yoke) resilient seated gate valves
  • Bypass Assembly: Meter (Gallons/Minute), Double Check, Test Cocks

Pressure & Temperature

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

Certificates & Approvals

  • Approved by 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

Dimensions & Weight (Approximate)

  • Length (A): 31 3/4 inches (806 mm)
  • Height (C OSY): 18 7/8 inches (479 mm)
  • Weight: 159 lbs (72 kgs)

FAQs

What is the primary function of the Watts LF757DCDA backflow preventer?

Its primary function is to prevent the backflow of non-health hazard pollutants into the potable water supply system. It's often used in fire line sprinkler systems to monitor unauthorized water use.

What materials are used for the housing and sleeve of this assembly?

The housing and sleeve are constructed from durable 304 Schedule 40 stainless steel, providing excellent corrosion resistance and longevity.

Can this backflow preventer be installed in different orientations?

Yes, the Watts LF757DCDA assembly is designed for versatile installation and can be used in horizontal, vertical, or N pattern configurations.

What is the maximum operating pressure for this 3 inch unit?

This backflow preventer has a maximum working pressure of 175 PSI (12.1 bar), making it suitable for continuous pressure service.

Does this assembly include a way to monitor water usage?

Yes, it features a bypass assembly with a meter that registers in gallons per minute, allowing for monitoring of water usage.

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