This 4 inch Lead Free Double Check Valve Backflow Preventer Assembly is designed to prevent the reverse flow of polluted water into potable water systems. Ideal for non-health hazard installations and continuous pressure piping applications, it features an epoxy coated cast iron body with ArmorTek technology for superior corrosion resistance. Equipped with domestic outside stem and yoke (OSY) shutoff valves, this assembly offers a modular design for simplified maintenance and replaceable internal components. It provides maximum flow at a low pressure drop and is approved for vertical flow up installation. The maximum working pressure is 175 psi.
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Installation & Use
This 4 inch double check valve assembly is designed for installation in continuous pressure piping applications.
It is used at cross-connections identified as non-health hazards to prevent the backflow of polluted water into the potable water supply.
Can be installed with vertical flow up orientation.
Requires approval by the local authority having jurisdiction for specific applications.
This 4 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.
It is ideal for protection in continuous pressure piping applications and at cross-connections identified as non-health hazards, where approved by the local authority having jurisdiction.
Key Features
Compact modular design facilitates easy maintenance with a single access cover for in-line repairs.
Provides maximum flow at low pressure drop.
Features replaceable check discs and seats.
No special tools are required for servicing.
Includes captured spring assemblies for safety.
Approved for vertical flow up installation.
Construction & Materials
Constructed with an epoxy coated cast iron body.
Utilizes ArmorTek® coating technology, a patented 3-part advanced epoxy system engineered to resist both microbial induced (MIC) and exposed metal substrate corrosion.
Equipped with domestic outside stem and yoke (OSY) resilient seated gate valves.
Contains two in-line independent positive seating check modules and top mounted test cocks.
The product is lead free, meaning the wetted surface contacted by consumable water contains less than 0.25% lead by weight.
Shutoff Type: Domestic Outside Stem and Yoke (OSY)
Body Material: Epoxy Coated Cast Iron
Coating: ArmorTek Powder Coating
Seat Material: Stainless Steel
Lead Content: Less than 0.25% by weight (Lead Free)
Maximum Working Pressure: 175 psi (12.1 bar)
Continuous Temperature Range: 33°F - 110°F (0.5°C - 43°C)
Intermittent Temperature Range: 140°F (60°C)
Certificates & Approvals
ASSE 1015
AWWA C510-92
CSA B64.5
UL Classified File No. EX3185
FM Approved
NSF Certified to NSF/ANSI 61-G
IAPMO PA 31
Approved by the Foundation for Cross-Connection Control and Hydraulic Research at the University of Southern California
USC Manual for Cross-Connection Control, 8th Edition
FAQs
What type of backflow prevention does this assembly provide?
This is a Double Check Valve Backflow Preventer Assembly, designed to protect against the backflow of polluted water.
What kind of installations is this backflow preventer suitable for?
It is ideal for non-health hazard installations, continuous pressure piping applications, and cross-connections where approved by the local authority.
Is the 4 inch LF709-DOSY backflow preventer lead-free?
Yes, this product is Lead Free. The wetted surface contacted by consumable water contains less than 0.25% lead by weight.
What is the maximum working pressure for this device?
The maximum working pressure for this 4 inch assembly is 175 psi (12.1 bar).
What are the primary materials used in the construction of this backflow preventer?
The check valve body is made from epoxy coated cast iron with ArmorTek powder coating, and the seats are stainless steel. It also features domestic OSY resilient seated gate valves.
