8 709DCDA-OSY-GPM 3/4

Item Number: 0389181
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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: 1439.0 lb
  • Body Material: Fused Epoxy Coated Cast Iron
  • Coating: ArmorTek® Technology for corrosion resistance
  • Bypass: 3/4 inch with Gallons per Minute meter
  • Maximum Working Pressure: 175 psi
  • Shutoff Valves: OSY Resilient Seated
  • Application: Non-health hazard fire protection
  • Approvals: UL Listed, FM Approved, ASSE 1048, AWWA C510

Description

This 8 inch Watts 709DCDA Series Double Check Detector Assembly backflow preventer is engineered for non-health hazard fire protection system containment. It stops the reverse flow of non-potable substances into potable water lines. Key features include a fused epoxy coated cast iron body with ArmorTek® corrosion-resistant coating, resilient seated OSY shutoff valves, and a 3/4 inch metered bypass for leak detection. Approved by UL, FM, ASSE 1048, and AWWA C510, it ensures reliable performance up to 175 psi. The modular design simplifies maintenance.

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Primary Use

This Watts 709DCDA Series Double Check Detector Assembly is specifically designed for installation on fire protection systems that are connected to a potable water supply. It prevents the backflow of non-health hazard substances (like glycerin wetting agents or stagnant water) from entering the potable water line.

Connections

  • The main assembly connects into the fire protection system piping.
  • The 3/4 inch metered bypass is integral for detecting system leaks and unauthorized water usage.
  • The unit includes Outside Stem and Yoke (OSY) shutoff valves for isolation.

Orientation

  • For 8 inch sizes, this assembly is approved for both horizontal and vertical "flow up" installations.
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Additional Details

This 8 inch Watts 709DCDA Series Double Check Detector Assembly backflow preventer is designed for water authority containment requirements, preventing the reverse flow of non-health hazard fire protection system substances into potable water lines.

It features a 3/4 inch metered bypass to detect leaks and unauthorized use, helping to reduce unaccountable water expenses.

Key Features

  • Fused epoxy coated cast iron body construction.
  • ArmorTek® coating technology on iron components resists microbial-induced corrosion (MIC) and protects exposed metal.
  • Equipped with resilient seated OSY shutoff valves.
  • Includes a gallons per minute meter.
  • Modular check design for simple maintenance and assembly access.
  • Replaceable bronze seats and bronze test cocks.
  • Provides maximum flow at low pressure drop.
  • Compact design combining economy with performance.
  • No special tools required for servicing.

Specifications

General

  • Series: 709DCDA
  • Size: 8 inch
  • Application: Non-health hazard fire protection systems

Materials

  • Body Material: Cast Iron (Fused Epoxy Coated)
  • Coating: ArmorTek® Powder Coating (Internal and External)
  • Seat Material: Bronze
  • Disc Holder Material: Bronze
  • Trim Material: Stainless Steel
  • Check Valve Discs: Rubber
  • Test Cock Material: Bronze
  • Shutoff Valves: Outside Stem and Yoke (OSY), Resilient Seated

Performance

  • Maximum Working Pressure: 175 psi (12.1 bar)
  • Temperature Range (Continuous): 33°F - 110°F (0.5°C – 43°C)
  • Temperature Range (Intermittent): 140°F (60°C)
  • Bypass: 3/4 inch with Gallons per Minute Meter

Dimensions & Weight

  • Overall Length (A): 75 in (1905 mm)
  • Approximate Weight (with OSY gates): 1327 lb (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

FAQs

What is the primary purpose of the Watts 709DCDA 8 inch Double Check Detector Assembly?

Its primary purpose is to prevent the backflow of non-health hazard fire protection system substances, such as glycerin wetting agents or stagnant water, from entering the potable water supply in accordance with water authority containment requirements.

What is the function of the 3/4 inch metered bypass?

The 3/4 inch metered bypass is designed to detect underground leaks and unauthorized water usage, helping to identify unaccountable water and reduce annual expenses for the water utility.

What material is the body of this backflow preventer made from, and how is it protected against corrosion?

The body is constructed from fused epoxy coated cast iron. It is protected against corrosion by ArmorTek® coating technology, a patented three-part advanced epoxy system that reduces microbial-induced corrosion (MIC) and protects exposed metal substrates.

What are the maximum operating pressure and temperature limits for this assembly?

The maximum working pressure for this assembly is 175 psi (12.1 bar). It can operate continuously in temperatures from 33°F to 110°F (0.5°C – 43°C) and intermittently up to 140°F (60°C).

What certifications and approvals does the Watts 709DCDA assembly hold?

This assembly is UL Listed, UL Classified, FM Approved, meets ASSE 1048, and AWWA Standard C510. It is also approved by the Foundation for Cross-Connection Control and Hydraulic Research at the University of Southern California.

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