8 475 RPDA DI BODY N-PATTERN, GRV X GRV, LESS GATE VALVES

Item Number: 8-475DAL
1 1
$37,031.95
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Wilkins
  • Size: 8 inch
  • Model: 475DA Reduced Pressure Detector Assembly
  • Main Valve Body: Ductile Iron ASTM A 536 Grade 4
  • Connections: Grooved for steel pipe
  • Maximum Operating Pressure: 175 PSI
  • Maximum Operating Temperature: 140°F
  • Features: Metered bypass system for leak detection
  • Certifications: ASSE® 1047, UL® Classified, FM® Approved, NSF/ANSI/CAN 61

Description

The Zurn 8 inch Model 475DA Reduced Pressure Detector Assembly is a critical component for fire protection systems, engineered to safeguard potable water from both backsiphonage and backpressure contamination. Designed for high-hazard applications, this 8-inch N-Pattern assembly features grooved connections for steel pipe and is supplied without shut-off valves. It includes a metered bypass system for precise leak detection and unauthorized water use monitoring, helping to reduce maintenance costs. Constructed from durable ductile iron with FDA approved epoxy coatings and EPDM/Buna Nitrile elastomers, it ensures reliability and long-term performance. Item number 8-475DAL.

Help Me Connect

End Connections

  • The 8 inch Zurn 475DA is supplied with grooved end connections that are suitable for connecting to steel pipe.
  • This specific model is configured to be installed without shut-off valves, allowing for direct integration into existing grooved piping systems.
View full details

Additional Details

The Zurn 8 inch Model 475DA Reduced Pressure Detector Assembly is designed for installation on water lines in fire protection systems to protect against both backsiphonage and backpressure of contaminated water into the potable water supply.

Application

  • Provides protection where a potential health hazard exists in fire protection systems.
  • Incorporates a metered bypass to detect leaks and unauthorized water use.

Design & Features

  • Configured in the N-Pattern for new or retrofit installations in compact spaces.
  • Features a small footprint for quick and easy fire protection retrofit applications.
  • This model is supplied without shut-off valves.

Materials

  • The main valve body and access covers are constructed from Ductile Iron ASTM A 536 Grade 4.
  • Internal components feature FDA Approved fusion epoxy finish coatings, Stainless Steel, 300 Series fasteners and springs.
  • Elastomers are EPDM (FDA approved) and Buna Nitrile (FDA approved).
  • The seat ring and check valve utilize NORYL™ polymers.

Specifications

  • Size: 8 inch
  • Model: 475DA
  • Maximum Working Water Pressure: 175 PSI
  • Maximum Working Water Temperature: 140°F
  • Hydrostatic Test Pressure: 350 PSI
  • Main Valve Body Material: Ductile Iron ASTM A 536 Grade 4
  • Access Covers Material: Ductile Iron ASTM A 536 Grade 4
  • Coatings: FDA Approved Fusion Epoxy Finish
  • Fasteners Material: Stainless Steel, 300 Series
  • Elastomers Material: EPDM (FDA approved), Buna Nitrile (FDA approved)
  • Polymers Material: NORYL™
  • Springs Material: Stainless Steel, 300 Series
  • End Connections: Grooved for steel pipe (AWWA C606)
  • Relief Valve Discharge Port (8 inch): 3.69 sq. in.
  • Overall Length (Dimension A): 29 inches (737 mm)
  • Face-to-Face (Dimension B): 46 inches (1168 mm)
  • Height (Dimension C, less gate valves): 37 3/4 inches (959 mm)
  • Width (Dimension D): 12 inches (305 mm)
  • Approximate Weight (less shut-off valves): 421 lbs

Certificates & Approvals

  • ASSE® Listed 1047 (4" thru 8")
  • AWWA Compliant C550
  • UL® Classified (4" thru 10")
  • C-UL® Classified (4" thru 10")
  • FM® Approved (4" thru 8")
  • NYC MEA 170-02-M VOL 2 (4" thru 8")
  • Approved by the Foundation for Cross Connection Control and Hydraulic Research at the University of Southern California (4" thru 8")
  • Meets the requirements of NSF/ANSI/CAN 61* (0.25% MAX. WEIGHTED AVERAGE LEAD CONTENT)

FAQs

What is the primary function of the Zurn 475DA Reduced Pressure Detector Assembly?

Its primary function is to protect potable water supplies in fire protection systems from contamination caused by backsiphonage and backpressure, particularly in high-hazard applications.

What type of end connections does this 8 inch model have?

This 8 inch Zurn 475DA model is equipped with grooved end connections, which are suitable for integration with steel pipe systems.

Does the 8-475DAL model include shut-off valves?

No, this specific model (indicated by 'LESS GATE VALVES' in the product name and 'L' suffix in the SKU) is supplied without shut-off valves.

What materials are used for the main body and internal components?

The main valve body and access covers are made of Ductile Iron ASTM A 536 Grade 4. Internal components feature FDA Approved fusion epoxy coatings, Stainless Steel fasteners and springs, and EPDM/Buna Nitrile elastomers with NORYL™ polymers for the seat ring and check valve.

What is the purpose of the metered bypass system?

The metered bypass system is designed to detect leaks within the system and identify any unauthorized water use, helping with efficient system management and maintenance.

Related Products