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The Wilkins ZW4004GSS-S is a Pressure-Tru™ automatic fire control pressure reducing valve designed for reliable pressure regulation in automatic sprinkler and standpipe systems under both flow and no-flow conditions.

Key Specifications:

• Size: 2 1/2 Inches
• Maximum Inlet Pressure: 400 psi
• Connection Type: Grooved AWWA C606
• Supervisory Switch Rating: 3 A @ 125 VAC
• Notable Certifications: UL, C-UL, NYC MEA, California Fire Marshal

Other Related Variants:

• ZW4004GSS-Q: Pressure setting Q
• ZW4004GSS-R: Pressure setting R
• ZW4004GSS-T: Pressure setting T
• ZW4004GSS-U: Pressure setting U

Materials:

• Cast Bronze ASTM B 584
• Buna Nitrile (FDA approved)
• EPDM (FDA approved)

Typical Installation:

The Zurn ZW4004GSS-S Series Pressure Reducing Valve is listed as a floor control valve, an indicating valve, and a check valve in automatic sprinkler systems as well as a standpipe valve for CLASS I and CLASS III systems.

Standards Compliance:

UL Listed; C-UL Listed; NYC MEA 325-06-E; City of Los Angeles Approved; California State Fire Marshal Listed

Features & Benefits:

• Factory Set Precision: Non-field adjustable design ensures consistent pressure regulation under both flow and no-flow conditions.
• Integral Supervisory Switch: Built-in listed supervisory switch with tamper resistant cover provides immediate valve position monitoring.
• Pressure Monitoring Capability: Tapped and plugged inlet and outlet ports allow for easy pressure gauge installation.
• Open/Close Indication: Built-in indicating feature provides visual confirmation of valve position for enhanced system monitoring.

FAQ

Q: What is the difference between the pressure setting variants (Q, R, S, T, U)?

A: Each pressure setting corresponds to a specific factory-set outlet pressure profile optimized for different system requirements. Setting S (this model) provides a 250 psi maximum inlet pressure, while Q, R, T, and U provide 310, 290, 225, and 200 psi respectively.

Q: Can the Wilkins ZW4004GSS-S be adjusted in the field?

A: No, the ZW4004GSS-S is factory set and non-field adjustable to ensure consistent performance and prevent unauthorized tampering in critical fire protection systems.

Q: What is the minimum pressure differential required for proper operation?

A: A minimum of 20 psi pressure differential between inlet static pressure and outlet set static pressure is recommended to ensure a well-regulated and efficient system.

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