8 709DCDA-DOSY-GPM

Item Number: 0389318
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$43,073.25
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When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 8 inch
  • Weight: 1360.0 lb
  • Body Material: Fused Epoxy Coated Cast Iron
  • Coating: ArmorTek® advanced epoxy system for corrosion resistance
  • Shutoff Valves: Resilient Seated OSY
  • Bypass Meter: 5/8" x 3/4" Bronze Gallons Per Minute
  • Maximum Working Pressure: 175 PSI
  • Approvals: UL Listed, FM Approved, ASSE 1048, AWWA C510
  • Application: Non-health hazard fire protection systems

Description

The Watts 8 inch 709DCDA Double Check Detector Assembly is engineered to prevent the reverse flow of non-potable fire protection system substances into a potable water supply. Featuring a fused epoxy coated cast iron body with patented ArmorTek® technology, it provides superior resistance to microbial-induced and electrochemical corrosion. This assembly includes UL Classified and FM Approved resilient seated OSY shutoff valves and a 5/8" x 3/4" bronze gallons per minute bypass meter for leak detection. Ideal for non-health hazard applications, this unit ensures water containment integrity and facilitates easy maintenance with its modular design. It meets ASSE 1048 and AWWA C510 standards.

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Application & Connection Guidance

  • This 8 inch Double Check Detector Assembly is designed for installation on fire protection systems when connected to a potable water supply.
  • It is specifically intended for cross-connections identified as non-health hazards, preventing the backflow of substances like stagnant water or glycerin wetting agents.
  • The unit includes domestic OSY (Outside Stem and Yoke) shutoff valves for isolation, and a gallons per minute meter for detecting bypass flow.
  • Installation must comply with local authority having jurisdiction. This 8-inch unit is approved for both horizontal and vertical "flow up" installations.
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Additional Details

The Watts Series 709DCDA 8 inch Double Check Detector Assembly backflow preventer is designed to protect potable water supplies from contamination by non-health hazard substances commonly found in fire protection systems.

This assembly prevents the reverse flow of substances like glycerin wetting agents and stagnant water from fire protection systems into the potable water line, making it ideal for cross-connection control in commercial and industrial applications.

Construction & Design

  • Features a fused epoxy coated cast iron body, utilizing ArmorTek® coating technology on all iron components to resist microbial-induced corrosion (MIC) and protect exposed metal surfaces.
  • Equipped with UL Classified and FM Approved resilient seated OSY shutoff valves for reliable isolation.
  • Includes a gallons per minute meter (5/8" x 3/4" bronze meter) in the bypass line to detect underground leaks and unauthorized water usage, helping to prevent unaccountable water loss.
  • The modular check design allows for easy maintenance and assembly access without special tools.
  • Designed for maximum flow at low pressure drop and compact for economical installation.

Specifications

General

  • Size: 8 inch
  • Series: 709DCDA
  • Application: Non-health hazard
  • Bypass Meter: 5/8" x 3/4" bronze, Gallons Per Minute (GPM)

Materials

  • Body Material: Cast Iron
  • Body Coating: ArmorTek powder coating (internal and external surfaces)
  • Seat Material: Bronze
  • Disc Holder Material: Bronze
  • Trim Material: Stainless steel
  • Check Valve Disc Material: Rubber
  • Test Cock Material: Bronze

Performance

  • 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)

Dimensions & Weight

  • Overall Length (A): 75 inches (1905 mm)
  • Face-to-Face (L): 52 inches (1321 mm)
  • Height with OSY Valves (C): 37 3/4 inches (959 mm)
  • Width (E): 26 inches (660 mm)
  • Approximate Weight (with OSY gates): 1327 lbs (602 kg)

Certificates & Approvals

  • UL Listed
  • UL Classified
  • FM Approved
  • ASSE 1048
  • AWWA Standard C510
  • Approved by Foundation for Cross-Connection Control and Hydraulic Research at the University of Southern California
  • Horizontal and Vertical "Flow Up" Approval: Sizes 4" - 10" (This 8" unit is approved)

FAQs

What is the primary purpose of the Watts 709DCDA Double Check Detector Assembly?

The primary purpose is to prevent the reverse flow of non-potable water and fire protection system substances, such as glycerin wetting agents, from entering a potable water supply. It is used in non-health hazard applications.

What is ArmorTek® coating and why is it important?

ArmorTek® is a patented three-part advanced epoxy coating system applied to the iron components of the backflow preventer. It is designed to reduce microbial-induced corrosion (MIC) and protect exposed metal substrates, enhancing the longevity and reliability of the unit.

Does this backflow preventer include shutoff valves and a meter?

Yes, this assembly comes standard with UL Classified and FM Approved resilient seated Outside Stem and Yoke (OSY) shutoff valves. It also includes a 5/8" x 3/4" bronze gallons per minute meter on the bypass line for detecting leaks and unauthorized water use.

What are the operating pressure and temperature limits for this device?

The maximum working pressure for this 8-inch unit is 175 PSI (12.1 bar). It can operate continuously in temperatures ranging from 33°F to 110°F (0.5°C to 43°C) and intermittently up to 140°F (60°C).

What certifications and approvals does this 8-inch model hold?

This 8-inch Watts 709DCDA model is UL Listed, UL Classified, FM Approved, ASSE 1048, and meets AWWA Standard C510. It is also approved by the Foundation for Cross-Connection Control and Hydraulic Research at USC.

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