Zurn Wilkins ZW4104SS Pressure-Tru® 1-1/2" Pressure Reducing Fire Sprinkler Control Valve, Integral Supervisory Switch

Zurn Wilkins ZW4104SS 1-1/2" Pressure Reducing Fire Sprinkler Control Valve with Supervisory Switch.

Product Overview

The Zurn Wilkins ZW4104SS Pressure-Tru® Fire Sprinkler Control Valve is a factory-set, non-adjustable pressure reducing valve designed to ensure safe, consistent water pressure in fire protection systems. Acting as a floor control valve, indicating valve, and check valve, it’s ideal for automatic sprinkler and standpipe Class II systems.

With a built-in supervisory switch, tamper-resistant housing, and durable cast bronze construction, the ZW4104SS is UL, C-UL, and California State Fire Marshal listed for proven reliability in both indoor and outdoor fire sprinkler applications.

Features & Benefits

• Pressure reducing design regulates outlet pressure under flow and no-flow conditions

• Built-in supervisory switch for monitoring and safety compliance

• 1-1/2" FNPT or grooved connections for versatile installation options

• Non-field adjustable, factory set for consistent and reliable operation

• Cast bronze body with Buna Nitrile and EPDM elastomers for durability

• Tamper-resistant housing with rotatable switch for easy wiring

Specifications

• Size: 1-1/2"

• Maximum Inlet Pressure: 400 PSI

• End Connections:

  • FNPT (ANSI B1.20.1)

  • Grooved (AWWA C606)

• Factory Pressure Setting: Non-adjustable

• Materials:

  • Body: Cast bronze, ASTM B 584

  • Elastomers: Buna Nitrile & EPDM (FDA approved)

• Compliance:

  • UL® Listed

  • C-UL® Listed

  • California State Fire Marshal Listed

Installation Tips

• Install in accordance with NFPA and local fire code requirements.

• Ensure correct orientation with inlet and outlet connections properly aligned.

• Use the tamper-resistant housing to protect supervisory switch wiring.

• Allow adequate clearance for valve operation and inspections.

• Test the valve during system commissioning to verify pressure regulation and supervisory switch function.

FAQs

Q: What type of systems is the ZW4104SS approved for?
A: It’s approved for use in automatic fire sprinkler systems and Class II standpipe systems.

Q: Can the outlet pressure be field adjusted?
A: No, it is factory set only to ensure safe and consistent operation.

Q: Does it come with a supervisory switch?
A: Yes, the supervisory switch is factory-installed and tamper-resistant.

Q: What’s the maximum inlet pressure rating?
A: The valve is rated for up to 400 PSI inlet pressure.

Q: Can it be installed outdoors?
A: Yes, it is suitable for both indoor and outdoor applications.