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The Wilkins 34-P4000A is a direct-acting thermal expansion relief valve designed for fire protection systems, providing adjustable pressure relief from 50-200 psi.

Key Specifications:

• Size: 3/4 Inches
• Adjustable Relief Pressure Range: 50-200 psi (UL)
• Maximum Inlet Pressure: 300 psi
• Notable Certifications: UL Listed, FM Approved
• End Connections: NPT threaded connections

Other Related Variants:

• 12-P4000A: 1/2 Inch model size

Materials:

• Cast Bronze ASTM B 806 (Main Valve Body & Cover)
• No Lead Brass (Plunger)
• Nylon Reinforced Buna-N (Diaphragm)
• EPDM FDA Approved Rubber (Plunger Rubber)
• Stainless Steel (Stem & Seat)

Typical Installation:

The Zurn Wilkins 34-P4000A can be installed in any position and is ideal for use in fire protection systems where thermal expansion, pumps or elevated plumbing could cause pressure surges within the fire protection distribution network. The Thermal Expansion Relief Valve prevents pressure build-up by venting excess pressure to atmosphere. Underwriters Laboratories requires the installation of a relief valve of not less than 1/2 inch in size on the downstream side of the pressure reducing valve with adequate drainage for the relief valve discharge.

Standards Compliance:

UL Listed; FM Approved; NFPA 13; NFPA 25; NPT ANSI B1.20.1

Features & Benefits:

• Overpressure Protection: Protects fire sprinkler and distribution systems from destructive pressure caused by thermal expansion, pumps, or elevated plumbing.
• Adjustable Relief Settings: Features adjustable relief pressure range of 50-200 psi with optional high pressure range 150-300 psi for flexible system requirements.
• Direct-Acting Design: Spring-loaded diaphragm design with internal sensing port provides reliable drip-tight shutoff and accurate pressure relief operation.
• Fire Protection Certified: UL Listed and FM Approved specifically for fire protection applications ensuring compliance with industry safety standards.

FAQ

Q: What is the primary application for the Wilkins 34-P4000A thermal expansion relief valve?

A: The Zurn 34-P4000A is designed for fire protection systems to relieve excess pressure caused by thermal expansion, pumps, or elevated plumbing, protecting fire distribution networks from high pressure build-up.

Q: Can the relief pressure be adjusted on this valve?

A: Yes, the relief set pressure can be easily adjusted by altering the compression force on the spring. The standard pilot spring range is 50-200 psi, with an optional high pressure range of 150-300 psi available.

Q: What installation position is required for the Zurn 34-P4000A?

A: The valve can be installed in any position, providing flexible installation options for fire protection systems. Adequate drainage for the relief valve discharge must be provided.

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