6 LF757NDCDA-OSY-GPM

Item Number: 0124701
1 1
$20,070.80
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 6 inch
  • Weight: 460.0 lb
  • Lead Free construction
  • Maximum Working Pressure: 175 psi
  • Temperature Range: 33°F – 140°F
  • Housing & Sleeve Material: 304 Stainless Steel
  • Includes Gallons Per Minute (GPM) Meter
  • Approved for N pattern installation
  • Certified to AWWA C510-97, ASSE 1048, CSA B64.4

Description

This 6 inch Watts LF757NDCDA-OSY-GPM is a lead-free double check detector backflow preventer assembly. It is designed for non-health hazard applications, preventing non-toxic pollutants from entering potable water systems, and is ideal for fire sprinkler lines requiring water usage monitoring. The assembly features a compact, 304 stainless steel housing that is 70% lighter than traditional designs, along with UL/FM outside stem and yoke (OSY) resilient seated gate shutoff valves and a gallons per minute meter. It has a maximum working pressure of 175 psi and is approved for N pattern installation. Certified by AWWA C510-97, ASSE 1048, CSA B64.4, UL, FM, and NSF.

Help Me Connect

Connections

  • This assembly features 150 pound ANSI/AWWA CL D flanged connections for secure installation.

Installation Guidance

This assembly is approved for N pattern installation. Always inquire with local governing authorities for specific installation requirements.

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Additional Details

This 6 inch lead free double check detector backflow preventer assembly is designed to prevent the backflow of objectionable but non-toxic pollutants from entering into potable water supply systems. It is primarily used on fire sprinkler lines when monitoring for unauthorized water use is necessary.

Features

  • Lead Free construction
  • Extremely compact design, 70% lighter than traditional designs
  • Housing & sleeve made from 304 (Schedule 40) stainless steel
  • Groove fittings allow integral pipeline adjustment
  • Unique tri-link spring check provides lowest pressure loss
  • Unopposed ease of serviceability
  • Approved for N pattern installation
  • Replaceable check disc rubber
  • Includes a gallons per minute meter

Components

  • Two independently operating tri-link check valves
  • Two UL/FM outside stem and yoke (OSY) resilient seated gate shutoff valves
  • Four test cocks

Specifications

General

  • Size: 6 inch
  • Installation Pattern: N Pattern
  • Wetted Surface Lead Content: Less than 0.25% by weight
  • Maximum Working Pressure: 175 psi (12.1 bar)
  • Temperature Range: 33°F – 140°F (0.5°C – 60°C)

Materials

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

Dimensions (Approximate)

  • Overall Length (A, with OSY): 37 3/4 inches (959 mm)
  • Width (C, valve open): 10 1/4 inches (260 mm)
  • Centerline to Bottom (D): 8 1/8 inches (206 mm)
  • Assembly Length (G): 43 3/4 inches (1111 mm)
  • Assembly Height (H): 27 3/4 inches (705 mm)
  • Valve Height from Centerline (J): 20 1/8 inches (511 mm)

Weight

  • Product Weight: 350 lbs (159 kgs)

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 B64.4
  • UL Listed
  • FM Approved
  • NSF

FAQs

What is the primary use of this backflow preventer?

This backflow preventer is primarily used on fire sprinkler lines to prevent objectionable but non-toxic pollutants from entering the potable water supply, especially when monitoring for unauthorized water use is necessary.

What does "Lead Free" construction mean?

"Lead Free" construction indicates that the wetted surface of the product contacted by consumable water contains less than 0.25% of lead by weight, complying with safety standards for potable water systems.

What type of shutoff valves are included with this assembly?

This assembly includes two UL/FM outside stem and yoke (OSY) resilient seated gate shutoff valves, which provide reliable control and isolation.

Can this backflow preventer be installed in any orientation?

This specific Watts LF757NDCDA-OSY-GPM model is approved for N pattern installation. Always consult the product manual and local codes for specific installation requirements.

What is the maximum working pressure and temperature range?

The maximum working pressure for this assembly is 175 psi (12.1 bar). It can operate within a temperature range of 33°F – 140°F (0.5°C – 60°C).

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