This 4 inch Lead Free Double Check Detector Backflow Preventer Assembly safeguards potable water supplies from non-health hazard pollutants. Featuring a compact 304 Schedule 40 stainless steel housing and OSY shutoff valves, it's 70% lighter than traditional designs. It includes a gallons per minute meter for monitoring water use, making it ideal for fire sprinkler systems. Rated for continuous pressure service up to 175 psi, it protects against backpressure and backsiphonage. This assembly ensures easy serviceability with its unique tri-link check design and is approved by ASSE, AWWA, CSA, FM, and NSF. Item number 0122716.
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Connections
This 4 inch backflow preventer assembly features groove end connections, allowing for integral pipeline adjustment.
The assembly is equipped with Outside Stem and Yoke (OSY) shutoff valves, which facilitate isolation for maintenance or system control.
It is designed for versatile installation in horizontal, vertical, or N pattern configurations to suit various piping layouts.
This 4 inch Lead Free Double Check Detector Backflow Preventer Assembly with OSY shutoff valves and a gallons per minute meter is designed to prevent backflow of non-health hazard pollutants into potable water supply systems. It is primarily used on fire line sprinkler systems where monitoring unauthorized water use is necessary.
The assembly may be installed under continuous pressure service to protect against both backpressure and backsiphonage in non-health hazard applications.
Features
Lead Free* construction
Extremely compact design and 70% lighter than traditional designs
Housing and sleeve constructed of 304 Schedule 40 stainless steel
Groove fittings allow integral pipeline adjustment
Unique tri-link spring checks provide lowest pressure loss
Unmatched ease of serviceability with removable and serviceable tri-link checks without special tools
May be used for horizontal, vertical, or N pattern installations
Replaceable check disc rubber
Includes a gallons per minute meter for monitoring water usage
Equipped with Outside Stem and Yoke (OSY) shutoff valves and four test cocks
*The wetted surface of this product contacted by consumable water contains less than 0.25% of lead by weight.
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
FAQs
What is the primary purpose of this backflow preventer assembly?
This assembly is primarily used to prevent the backflow of non-health hazard pollutants, such as those that are objectionable but not toxic, from entering a potable water supply system. It's often used in fire sprinkler systems to monitor water usage.
What types of shutoff valves are included with this assembly?
This 4 inch backflow preventer assembly comes equipped with Outside Stem and Yoke (OSY) shutoff valves, which allow for visual confirmation of the valve's open or closed position.
Is this product suitable for potable water applications?
Yes, this product features "Lead Free*" construction, meaning the wetted surface contains less than 0.25% lead by weight, making it suitable for contact with consumable water and certified to NSF/ANSI 372.
What is the maximum operating pressure and temperature for this device?
The maximum working pressure for this assembly is 175 psi (12.1 bar). It operates within a temperature range of 33°F to 140°F (0.5°C to 60°C).
Can this backflow preventer be installed in different orientations?
Yes, this Watts LF757DCDA series assembly is designed for versatile installation and may be used in horizontal, vertical, or N pattern configurations, depending on the specific piping layout requirements.
