8 450 DCDA SS BODY N PATTERN BFLY GRV X GRV

Item Number: 8-450STDABG
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$39,658.94
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When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Wilkins
  • Size: 8 inch
  • Body Material: 304L Stainless Steel
  • Connection Type: Grooved Inlet x Grooved Outlet
  • Valve Type: Butterfly Valves with Integral Supervisory Switches
  • Maximum Working Pressure: 175 PSI
  • Application: Fire protection systems
  • Features: Metered by-pass for leak detection
  • Compliance: ASSE® Listed 1048, CSA® Certified B64.5, NSF/ANSI/CAN 61

Description

The Wilkins 450STDA Stainless Steel Double Check Detector Assembly is an 8-inch backflow preventer engineered for fire protection systems. This DCDA safeguards potable water from backsiphonage and backpressure of polluted water, featuring a metered by-pass for leak detection and monitoring unauthorized water usage. Its durable 304L stainless steel body, grooved inlet/outlet connections, and butterfly valves with supervisory switches ensure reliability. The patented AR spool allows for easy drop-in replacement, matching various lay-lengths while maintaining agency approvals. This assembly is ASSE 1048 and CSA B64.5 certified, making it ideal for new installations or retrofits where a potential health hazard does not exist.

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Installation & Compatibility

  • This 8-inch Wilkins 450STDA DCDA is designed for new installations and as a direct drop-in replacement for competitor valves in fire protection systems.
  • The patented AR spool is engineered to match the lay-lengths of common n-pattern valves, simplifying replacements while maintaining agency approvals.
  • Connections are 8-inch grooved inlet and outlet, compatible with grooved piping systems.
  • Installation must comply with local codes, manufacturer's instructions, and the latest edition of the Uniform Plumbing Code.
  • The assembly should be mounted above adequate drains with sufficient side clearance for testing and maintenance, and no part of the unit can be submerged.
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Additional Details

The Wilkins Model 450STDA Stainless Steel n-Pattern Double Check Detector Assembly is an 8-inch backflow prevention device designed for use in fire protection systems.

It provides robust protection against both backsiphonage and backpressure of polluted water into the potable water supply, and includes a metered by-pass to detect leaks and unauthorized water use.

Connections

  • Inlet Connection: 8 inch Grooved
  • Outlet Connection: 8 inch Grooved
  • Features grooved end butterfly valves with integral supervisory switches

Materials

  • Main Valve Body: 304L Stainless steel
  • Access Covers: 304L Stainless steel
  • Internals: Stainless steel, 300 Series, NORYL™ (NSF Listed)
  • Fasteners and Springs: Stainless Steel, 300 Series
  • Seal Ring: EPDM (FDA approved)
  • O-Ring: Buna Nitrile (FDA approved)
  • Stem: Stainless steel (ASTM A 276)
  • Seat Ring and Check Valve: Noryl™ (NSF Listed)
  • Seat Disc Elastomers: EPDM

Features

  • Superior stainless steel body resists corrosion and extends product life
  • Small, compact footprint allows for direct drop-in replacement
  • Time-tested check and relief valve components ensure easy maintenance and more water system uptime
  • Patented compound checks provide ultra-low pressure drop as documented by approval authorities, reducing the need for a booster pump
  • Patented AR spool for drop-in replacements, matching lay-lengths of common n-pattern valves and maintaining agency approvals when installed by the factory
  • First and second check valves are accessible for maintenance without removing the device from the line
  • Designed for new installation or drop-in replacement of competitor valves
  • Includes a metered by-pass for leak detection and monitoring unauthorized water use

Specifications

  • Model: 450STDA
  • Size: 8 inch
  • Valve Type: Double Check Detector Assembly (DCDA)
  • Body Material: 304L Stainless Steel
  • Inlet Connection Type: Grooved
  • Outlet Connection Type: Grooved
  • Valve Type (Main Line): Butterfly Valves with Integral Supervisory Switches
  • Main Valve Body Material: 304L Stainless Steel
  • Access Cover Material: 304L Stainless Steel
  • Internal Materials: Stainless steel, 300 Series, NORYL™ (NSF Listed)
  • Fasteners and Springs Material: Stainless Steel, 300 Series
  • Seal Ring Material: EPDM (FDA approved)
  • O-Ring Material: Buna Nitrile (FDA approved)
  • Stem Material: Stainless steel (ASTM A 276)
  • Seat Ring and Check Valve Material: Noryl™ (NSF Listed)
  • Seat Disc Elastomer Material: EPDM
  • Maximum Working Water Pressure: 175 PSI
  • Minimum Working Water Pressure: 20 PSI
  • Maximum Working Water Temperature: 140° F
  • Minimum Working Water Temperature: 33° F
  • Hydrostatic Test Pressure: 350 PSI
  • End Connections (Grooved for steel): AWWA C606
  • Flanged Bolt Pattern: ASME B16.42 Class 150
  • Approximate Weight (with Butterfly Valves, Grooved x Grooved): 379 lbs (172 kg)
  • Approximate 'A' Dimension (Length with Butterfly Valves): 29 1/8 inches (740 mm)
  • Approximate 'C' Dimension (Length with Butterfly Valves, OS&Y Open): 37 inches (940 mm)
  • Approximate 'D' Dimension (Height): 12 7/8 inches (323 mm)
  • 8 inch Pipe Capacity @ 5 ft/sec: 780 GPM
  • 8 inch Pipe Capacity @ 7.5 ft/sec: 1169 GPM
  • 8 inch Pipe Capacity @ 10 ft/sec: 1559 GPM
  • 8 inch Pipe Capacity @ 15 ft/sec: 2339 GPM

Certificates & Approvals

  • ASSE® Listed 1048
  • CSA® Certified B64.5
  • AWWA Compliant C510 (with gates only)
  • AWWA Compliant C550
  • UL® Classified
  • C-UL® Classified
  • FM® Approved
  • Meets NSF/ANSI/CAN 61* (0.25% MAX. WEIGHTED AVERAGE LEAD CONTENT)
  • Approved by the Foundation for Cross Connection Control and Hydraulic Research at the University of Southern California

FAQs

What is the primary application of the Wilkins 450STDA?

The Wilkins 450STDA is primarily designed for use in fire protection systems to prevent backsiphonage and backpressure of polluted water into the potable water supply. It is suitable for new installations and direct drop-in replacements.

What are the connection types and sizes for this 8-inch model?

This 8-inch model features grooved inlet and grooved outlet connections. It also includes grooved end butterfly valves with integral supervisory switches for main line control.

What are the main materials used in the construction of the 450STDA?

The main valve body and access covers are constructed from 304L Stainless Steel for superior corrosion resistance. Internal components include Stainless steel, 300 Series, and NORYL™ parts, with EPDM and Buna Nitrile seals.

What is the maximum working pressure for this backflow assembly?

The Wilkins 450STDA has a maximum working water pressure of 175 PSI. It is also hydrostatically tested to 350 PSI.

Does this model include a feature to detect leaks or unauthorized water use?

Yes, the 450STDA incorporates a metered by-pass assembly. This feature is designed to detect small leaks or unauthorized water usage within the system.