Zurn Wilkins - 375 ASTDAL Series - Backflow Preventer

The Zurn Wilkins 375DA Reduced Pressure Detector Assembly with epoxy coated ductile iron body provides high hazard protection and is ideal for fire protection applications, with a metered by-pass to detect leaks and unauthorized water use.

Features and Benefits

• Zurn Wilkins Compound Check provides low head loss.
• Lowest life cycle costs in the Backflow industry
• Approved in horizontal and vertical positions.

Typical Application

Designed for installation on water lines in fire protection systems to protect against both back siphonage and backpressure of contaminated water into the potable water supply. The Model 375DA shall provide protection where a potential health hazard exists. Incorporates metered by-pass to detect leaks and unauthorized water use.

Standards Compliance

• ASSE Listed 1047
• UL Classified
• AWWA Compliant C550
• CSA Certified B64.4 (4” & 6”)
• C-UL Classified
• FM Approved
• NYC MEA 218-01-M VOL 3
• Approved by the Foundation for Cross Connection Control and Hydraulic Research at the University of Southern California
• Meets the requirements of NSF/ANSI 61*

*(0.25% MAX. WEIGHTED AVERAGE LEAD CONTENT)

Operating Parameters

• Maximum working water pressure: 175 PSI
• Maximum working water temperature: 140°F
• Hydrostatic test pressure: 350 PSI
• End connections (Grooved for steel pipe): AWWA C606
  (Flanged bolt pattern): ASME B16.42 Class 150

Materials

• Main valve body: Ductile Iron ASTM A 536
• Access covers: Ductile Iron ASTM A 536
• Coatings: NSF Approved fusion epoxy finish
• Internals: Stainless steel 300 Series NORYL
• Fasteners: Stainless Steel, 300 Series
• Elastomers: EPDM (FDA approved)
  Buna Nitrile (FDA approved)
• Polymers: NORYL
• Springs: Stainless steel, 300 series
• Sensing line: Stainless steel, braided hose

Flow Characteristics

MODEL 375DA 2 1/2", 3" & 4" (STANDARD & METRIC)

MODEL 375DA 6", 8" & 10" (STANDARD & METRIC)

The Reduced Pressure Detector Backflow Prevention Assembly shall be certified to NSF/ANSI 61, ASSE® Listed 1047, and supplied with full port OS & Y gate valves. The main body and access cover shall be epoxy coated ductile iron (ASTM A 536), the seat ring and check valve shall be NORYL™, the stem shall be stainless steel (ASTM A 276) and the seat disc elastomers shall be EPDM. The checks and the relief valve shall be accessible for maintenance without removing the device from the line. The Reduced Pressure Detector Backflow Prevention Assembly shall be a ZURN WILKINS Model 375DA.

Dimensions and Weights

Typical Installation

Local codes shall govern installation requirements. To be installed in accordance with the manufacturer’s instructions and the latest edition of the Uniform Plumbing Code. Unless otherwise specified, the assembly shall be mounted at a minimum of 12" (305mm) and a maximum of 30" (762mm) above adequate drains with sufficient side clearance for testing and maintenance. The installation shall be made so that no part of the unit can be submerged.

Outdoor Installation

Indoor Installation