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The Wilkins ZW4000G-U is a UL Listed pressure reducing standpipe valve designed for CLASS I and CLASS III fire hose systems, regulating pressure under both flow and no-flow conditions.

Key Specifications:

• Size: 2 1/2 Inches
• Maximum Inlet Pressure: 200 psi
• Flow Capacity: Up to 500 GPM
• Notable Certifications: UL Listed, C-UL Listed
• Connection Type: Grooved inlet, male hose outlet

Other Related Variants:

• ZW4000G-P: 360 psi maximum inlet pressure version
• ZW4000G-Q: 310 psi maximum inlet pressure version
• ZW4000G-R: 290 psi maximum inlet pressure version
• ZW4000G-S: 250 psi maximum inlet pressure version
• ZW4000G-T: 225 psi maximum inlet pressure version

Materials:

• Cast bronze body (ASTM B 584)
• Buna Nitrile elastomers (FDA approved)
• EPDM elastomers (FDA approved)

Typical Installation:

The Zurn ZW4000G-U is designed for individual hose stations in CLASS I and CLASS III standpipe systems, providing reliable pressure regulation for fire protection applications in commercial and residential buildings.

Standards Compliance:

UL Listed; C-UL Listed; NYC MEA 325-06-E; City of Los Angeles Approved; AWWA C606; NFPA 1963; ANSI B1.20.1

Features & Benefits:

• Dual-Condition Regulation: Maintains consistent pressure under both flow and no-flow conditions for reliable fire protection system performance.
• Durable Bronze Construction: Cast bronze body (ASTM B 584) ensures long-lasting durability in demanding fire protection environments.
• Field-Ready Design: Factory set with tapped and plugged inlet and outlet ports for easy pressure gauge installation and system monitoring.
• Comprehensive Listings: UL and C-UL Listed with multiple jurisdictional approvals for broad compliance and installation flexibility.

FAQ

Q: What is the difference between the bonnet type U and other bonnet types?

A: The bonnet type U designation indicates a maximum inlet pressure rating of 200 psi. Other bonnet types (P, Q, R, S, T) accommodate higher inlet pressures ranging from 225 to 360 psi.

Q: Can the Wilkins ZW4000G-U regulate pressure under no-flow conditions?

A: Yes, the Zurn ZW4000G-U is specifically designed to regulate pressure under both flow and no-flow conditions, ensuring consistent outlet pressure at all times.

Q: What is the difference between the grooved and threaded inlet models?

A: The ZW4000G-U features a grooved inlet connection compliant with AWWA C606 standards, while the ZW4000 model uses a female NPT threaded inlet connection per ANSI B1.20.1.

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