4 709DCDA-DOSY-GPM3/4

Item Number: 0389191
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$15,038.24
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When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 4 inch
  • Weight: 522.0 lb
  • Body Material: Fused Epoxy Coated Cast Iron
  • Coating: ArmorTek® advanced epoxy system for corrosion resistance
  • Maximum Working Pressure: 175 psi
  • Temperature Range: 33°F - 110°F (continuous)
  • Bypass Meter: 3/4 inch, Gallons per minute
  • Shutoff Valves: Domestic OSY resilient seated gate valves
  • Approvals: UL Classified, FM Approved, ASSE 1048, CSA B64.4

Description

The 4 inch Watts 709DCDA Double Check Detector Backflow Preventer is engineered to protect potable water supplies from contaminants in fire protection systems. This assembly features a fused epoxy coated cast iron body with ArmorTek® advanced coating for superior corrosion resistance. It includes domestic OSY shutoff valves and a 3/4 inch bypass with a gallons per minute meter for leak detection. Approved for non-health hazard cross-connections, this unit is UL Classified, FM Approved, and meets ASSE 1048 and CSA B64.4 standards. Item number 0389191.

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Installation & Compatibility

  • This 4 inch Double Check Detector Assembly is specifically designed for installation on fire protection systems to prevent the reverse flow of fire protection substances and non-potable water into the potable water supply.
  • It is suitable for cross-connections identified as non-health hazards.
  • The assembly includes integrated domestic outside stem and yoke (OSY) resilient seated gate valves for convenient shutoff.
  • A 3/4 inch bypass line with a gallons per minute meter is provided for leak detection and monitoring of water usage.
  • The 4 inch model is approved for both horizontal and vertical "flow up" installations.
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Additional Details

This 4 inch 709DCDA Double Check Detector Backflow Preventer assembly is designed to prevent the reverse flow of fire protection substances and non-potable water into the potable water supply, protecting against back-siphonage and backpressure. It is ideal for non-health hazard cross-connections on fire protection systems and other service line entrances where contaminants may be present.

Construction & Design

  • Features a fused epoxy coated cast iron body for durability.
  • Utilizes ArmorTek® coating technology, a patented 3-part advanced epoxy system, to resist microbial-induced corrosion (MIC) and protect exposed metal substrate.
  • Designed for maximum flow at low pressure drop and compact for economy and performance.
  • Modular check design facilitates maintenance and assembly access, with no special tools required for servicing.

Components

  • Includes domestic outside stem and yoke (OSY) resilient seated gate valves for shutoff.
  • Equipped with captured spring check valves.
  • Features a 3/4 inch bypass with a gallons per minute meter to detect underground leaks and unauthorized water use.
  • Furnished with four bronze test cocks.

Specifications

  • Size: 4 inch
  • Body Material: Cast Iron
  • Coating: ArmorTek® powder coating, applied to internal and external surfaces
  • Seat Material: Bronze
  • Disc Holder Material: Bronze
  • Trim Material: Stainless steel
  • Check Valve Discs: Rubber
  • Test Cocks Material: Bronze

Pressure & Temperature

  • 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)

Certificates & Approvals

  • AWWA Standard C510
  • ASSE 1048
  • UL Classified
  • FM Approved
  • CSA B64.4
  • Approved by the Foundation for Cross-Connection Control and Hydraulic Research at the University of Southern California
  • UL Classified and FM Approved OSY shutoff valves

FAQs

What is the primary application of the Watts 709DCDA 4 inch Double Check Detector Assembly?

This assembly is designed for installation on fire protection systems to prevent the reverse flow of non-potable water and fire protection substances into the potable water supply. It is used in cross-connections identified as non-health hazards.

What is ArmorTek® coating and what are its benefits?

ArmorTek® is a patented three-part advanced epoxy coating system applied to the internal and external surfaces of the cast iron components. It is engineered to reduce microbial-induced corrosion (MIC) and protect against electrochemical corrosion and exposed metal substrate damage.

What certifications and approvals does this backflow preventer hold?

This 4 inch Watts 709DCDA assembly is UL Classified, FM Approved, and meets AWWA Standard C510, ASSE 1048, and CSA B64.4 requirements. It is also approved by the Foundation for Cross-Connection Control and Hydraulic Research.

What type of shutoff valves are included with this assembly?

The backflow preventer is furnished with domestic outside stem and yoke (OSY) resilient seated gate valves. These shutoff valves are also UL Classified and FM Approved.

What is the purpose of the 3/4 inch bypass with a meter?

The 3/4 inch bypass includes a gallons per minute meter. This feature allows for the detection of underground leaks that would otherwise be unaccountable water loss, and it can also identify unauthorized water use or illegal taps.

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