Modular Design: Easy maintenance, no special tools
Approved: ASSE 1015, AWWA C510-92, CSA B64.5, UL, FM
Description
The 3 inch Watts LF709-DOSY Lead Free Double Check Valve Backflow Preventer Assembly is designed to protect potable water systems from polluted water backflow. Featuring a durable cast iron body with ArmorTek® advanced epoxy coating, it resists corrosion and extends service life. This assembly includes domestic Outside Stem and Yoke (OSY) shutoff valves and a modular design for simplified maintenance without special tools. It's suitable for continuous pressure piping in non-health hazard applications, with approvals including ASSE 1015, AWWA C510-92, and UL Classified. Rated for 175 PSI maximum working pressure, ensuring reliable performance.
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Applications
Designed for installation at cross-connections to prevent the backflow of polluted water into the potable water supply.
Suitable for continuous pressure piping applications.
Intended for non-health hazard installations, where approved by local authority having jurisdiction.
This 3 inch lead free double check valve backflow preventer assembly is designed to prevent the reverse flow of polluted water from entering into the potable water supply due to backsiphonage and or backpressure.
Its compact modular design facilitates easy maintenance with a single access cover for in-line repairs and is ideal for protection in continuous pressure piping applications and at cross-connections identified as non-health hazards.
Features
Simplified modular design concept to facilitate complete maintenance and assembly by retaining the spring load
Replaceable stainless steel seats
Maximum flow at low pressure drop
ArmorTek® coating technology to resist corrosion of internals
No special tools required for servicing
Captured spring assemblies for safety
Components
Fused epoxy coated cast iron body
Domestic outside stem and yoke (OSY) resilient seated gate valves
Top mounted test cocks
Two in-line independent positive seating check modules
Captured springs
Replaceable check discs and seats
Coating Technology
ArmorTek®, a patented 3-part advanced epoxy coating system, designed to limit both microbial induced (MIC) and exposed metal substrate corrosion.
Specifications
Product Type: Double Check Valve Assembly
Nominal Size: 3 inch
Body Material: Cast Iron
Coating: ArmorTek® Patented 3-Part Advanced Epoxy System
Shutoff Valve Type: Domestic Outside Stem and Yoke (OSY)
Lead Content: Less than 0.25% by weight (Lead Free*)
Maximum Working Pressure: 175 PSI (12.1 bar)
Temperature Range: 33°F - 110°F (0.5°C - 43°C)
Seats: Replaceable Stainless Steel
Certificates & Approvals
ASSE No. 1015
AWWA C510-92
CSA B64.5
UL Classified File No. EX3185
Foundation for Cross-Connection Control and Hydraulic Research (University of Southern California)
FM Approved (Sizes 2 1/2" and 3" approved horizontal only)
FAQs
What is the primary function of the Watts LF709-DOSY Double Check Valve Assembly?
This assembly is designed to prevent the reverse flow of polluted water from entering into the potable water supply, protecting it from backsiphonage or backpressure in non-health hazard applications.
What type of shutoff valves are used on this assembly?
The Watts LF709-DOSY features domestic Outside Stem and Yoke (OSY) resilient seated gate valves for reliable shutoff.
What is the body material and coating of the LF709-DOSY?
The body is constructed from fused epoxy coated cast iron. It utilizes ArmorTek®, a patented 3-part advanced epoxy coating system designed to resist microbial induced corrosion (MIC) and protect exposed metal surfaces.
Is special tooling required to maintain this backflow preventer?
No, the LF709-DOSY features a modular check design and captured spring assemblies that facilitate maintenance and assembly without the need for special tools.
What certifications and approvals does this backflow preventer hold?
It meets requirements for ASSE No. 1015, AWWA C510-92, CSA B64.5, UL Classified File No. EX3185, and is FM Approved. It is also approved by the Foundation for Cross-Connection Control and Hydraulic Research.
