4 450 DCDA SS BODY N PATTERN BFLY GRV X GRV

Item Number: 4-450STDABG
1 1
$14,503.52
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When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Wilkins
  • Nominal Size: 4 inch
  • Body Material: 304L Stainless Steel
  • End Connections: Grooved (for steel)
  • Valve Type: Grooved End Butterfly
  • Maximum Working Pressure: 175 psi
  • Certified: ASSE 1048, CSA B64.5, UL, FM, NSF/ANSI/CAN 61
  • Patented AR spool for drop-in replacement flexibility
  • Metered bypass included for leak detection

Description

The Zurn Wilkins Model 450STDA is a 4-inch Double Check Detector Assembly (DCDA) with a 304L stainless steel body and grooved end butterfly valves, specifically designed for fire protection systems. This DCDA prevents backflow and backsiphonage of polluted water into potable water supplies where a health hazard does not exist. It features a metered bypass for leak detection and monitoring water use. The unit is engineered for both new installations and as a direct drop-in replacement, incorporating a patented AR spool to match various lay lengths. It offers ultra-low pressure drop and is approved by ASSE 1048, CSA B64.5, UL, FM, and NSF/ANSI/CAN 61. Item number 4-450STDABG.

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Primary Use

The Zurn Wilkins Model 450STDA Double Check Detector Assembly is specifically designed for installation in fire protection systems to prevent backflow and backsiphonage of polluted water into potable water supplies.

Connections

  • This 4-inch assembly features grooved end connections, making it suitable for direct connection to compatible 4-inch grooved piping systems.
  • The unit includes grooved end butterfly valves with integral supervisory switches.

Compatibility & Installation

  • The 450STDA is ideal for new installations and is also engineered for direct drop-in replacement of competitor valves.
  • Its patented AR spool allows it to match the lay-lengths of many common n-pattern valves, simplifying retrofitting while ensuring agency approvals are maintained.
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Additional Details

This Zurn Wilkins Model 450STDA is a 4-inch Double Check Detector Assembly (DCDA) designed for installation on water lines in fire protection systems. It prevents the backflow and backsiphonage of polluted water into potable water supplies where a potential health hazard does not exist.

The assembly incorporates a metered bypass to detect leaks and monitor unauthorized water use. Its superior 304L stainless steel body resists corrosion, extending the product's life, and its compact footprint allows for direct drop-in replacement.

Application & Features

  • Designed for new installations or as a direct drop-in replacement for competitor valves.
  • Protects against backflow and backsiphonage of polluted water.
  • Features a metered by-pass assembly for leak detection and monitoring water use.
  • Patented AR spool allows for flexible drop-in replacements, matching lay-lengths of common n-pattern valves while maintaining agency approvals.
  • Patented compound checks provide ultra-low pressure drop, potentially reducing the need for a booster pump.
  • Supplied with grooved end butterfly valves that include integral supervisory switches.

Construction Materials

  • Main valve body and access covers made from 304L Stainless Steel.
  • Internals are Stainless steel and NORYL™, NSF Listed.
  • Fasteners and springs are Stainless Steel, 300 Series.
  • Seal ring is EPDM (FDA approved) and O-ring is Buna Nitrile (FDA approved).

Specifications

  • Nominal Size: 4 inch
  • End Connections: Grooved (for steel)
  • Valve Type: Grooved End Butterfly Valves with integral supervisory switches
  • Main Valve Body Material: 304L Stainless Steel
  • Access Cover Material: 304L Stainless Steel
  • Internals Material: 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)
  • By-Pass Backflow Assembly: 3/4 inch Model 950XLDTCU
  • 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

Certificates & Approvals

  • ASSE® Listed 1048
  • CSA® Certified B64.5
  • AWWA Compliant C550; C510 (with gate valves only)
  • UL® Classified
  • C-UL® Classified
  • FM® Approved
  • Meets the requirements of NSF/ANSI/CAN 61* (*0.25% MAX. WEIGHTED AVERAGE LEAD CONTENT)

FAQs

What is the primary use of the Zurn Wilkins 450STDA DCDA?

This 4-inch Double Check Detector Assembly is designed for installation on water lines in fire protection systems. Its main function is to prevent backflow and backsiphonage of polluted water into potable water supplies where a potential health hazard does not exist.

What type of connections does this 4-inch model feature?

This specific model, 4-450STDABG, is configured with 4-inch grooved end connections, making it suitable for direct connection to compatible grooved piping systems. It also includes grooved end butterfly valves with integral supervisory switches.

What materials are used in the construction of this backflow assembly?

The main valve body and access covers are constructed from robust 304L Stainless Steel for durability and corrosion resistance. Key internal components are made of Stainless steel and NORYL™, while the seal rings are EPDM (FDA approved) and O-rings are Buna Nitrile (FDA approved).

Does this unit include a bypass for leak detection?

Yes, the Model 450STDA incorporates a 3/4-inch Model 950XLDTCU metered bypass assembly. This feature is crucial for detecting leaks and monitoring unauthorized water use within the connected system, ensuring accountability and preventing water loss.

What are the key certifications and approvals for the Zurn Wilkins 450STDA?

This assembly holds numerous certifications, including ASSE Listed 1048, CSA Certified B64.5, UL and C-UL Classified, and FM Approved. It also complies with AWWA C550 standards and meets the requirements of NSF/ANSI/CAN 61 for lead content.