Lead Free construction (<0.25% wetted lead content)
Housing & Sleeve: 304 Schedule 40 Stainless Steel
70% lighter than traditional designs
Maximum Working Pressure: 175 PSI
Temperature Range: 33°F – 140°F
Shutoff Valves: UL/FM OSY Gate Valves
Equipped with Gallons per Minute (GPM) meter
Description
This Watts 6 inch LF757DCDA Double Check Detector Backflow Preventer Assembly is designed to safeguard potable water systems from non-health hazard pollutants, making it ideal for fire line sprinkler systems that require water usage monitoring. Constructed from 304 Schedule 40 stainless steel, it is 70% lighter and more compact than conventional designs, featuring a robust, Lead Free* build. It incorporates UL/FM OSY shutoff valves and a gallons per minute meter for unauthorized water use detection. With a 175 PSI maximum working pressure and versatile installation options (horizontal, vertical, N-pattern), it ensures reliable protection against backpressure and backsiphonage. Item number 0122717.
Help Me Connect
Connections
The assembly features groove end connections for integral pipeline adjustment and simplified installation.
Equipped with UL/FM outside stem and yoke (OSY) resilient seated gate shutoff valves.
This Watts 6 inch Lead Free Double Check Detector Backflow Preventer Assembly is designed to prevent the backflow of non-health hazard pollutants into potable water supply systems.
It is primarily used in fire line sprinkler systems where monitoring unauthorized water use is necessary, operating effectively under continuous pressure and against backpressure or backsiphonage.
Features
Features Lead Free* construction with wetted surfaces containing less than 0.25% lead by weight.
Extremely compact design, making it 70% lighter than traditional backflow preventers.
Equipped with UL/FM outside stem and yoke resilient seated gate valves.
Includes a gallons per minute meter in the bypass assembly for monitoring unauthorized water use.
Groove fittings allow for integral pipeline adjustment.
Unique tri-link spring check design offers the lowest pressure loss.
Unmatched ease of serviceability with removable and serviceable tri-link checks without special tools.
Replaceable check disc rubber for extended service life.
Supports horizontal, vertical, or N pattern installations.
Construction
Housing and sleeve are constructed from 304 Schedule 40 stainless steel pipe for durability and corrosion resistance.
Consists of two independent tri-link check modules within a single housing, a sleeve access port, four test cocks, and two drip-tight shutoff valves.
Approved by: FCCCHR-USC (Foundation for Cross-Connection Control and Hydraulic Research at The University of Southern California)
Certified to: AWWA C510-97, ASSE 1048, CSA B64.5, NSF/ANSI 372
Classified by: cULus (for OSY)
Approved by: FM (for OSY)
Dimensions (Approximate)
Length (A): 43.5 inches (1105 mm)
Height (C OSY): 30.125 inches (765 mm)
Width (D): 5.5 inches (140 mm)
Weight (LF757DCDA): 309 lbs (140 kgs)
FAQs
What is the primary function of this backflow preventer assembly?
This backflow preventer is designed to prevent the backflow of non-health hazard pollutants into the potable water supply system. It ensures water safety by protecting against both backpressure and backsiphonage.
What does "Lead Free" construction mean for this product?
"Lead Free" construction indicates that the wetted surfaces of the product, which come into contact with consumable water, contain less than 0.25% lead by weight, meeting NSF/ANSI 372 standards.
What type of shutoff valves does this assembly use?
This assembly is equipped with UL/FM approved outside stem and yoke (OSY) resilient seated gate shutoff valves.
Can this backflow preventer be installed in different orientations?
Yes, the LF757DCDA series is versatile and can be installed in horizontal, vertical, or N pattern configurations to suit various system layouts.
What is the purpose of the meter in this assembly?
The bypass assembly includes a meter, which registers in either gallons or cubic measurement, to monitor unauthorized use of water in fire line sprinkler systems.
