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The Wilkins 12-P4000A is a direct-acting thermal expansion relief valve designed to protect fire protection systems from destructive pressure build-up caused by thermal expansion, pumps, or elevated plumbing.

Key Specifications:

• Size: 1/2 Inches
• Adjustable Relief Pressure Range: 50-200 psi standard
• Maximum Inlet Pressure: 300 psi
• Notable Certifications: UL Listed, FM Approved
• End Connections: NPT threaded ends

Other Related Variants:

• 34-P4000A: 3/4 Inch model size

Materials:

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

Typical Installation:

The Zurn 12-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" in size on the downstream side of the pressure reducing valve. Adequate drainage for the relief valve discharge must be provided.

Standards Compliance:

UL Listed; FM Approved; NFPA 13 Installation Standard; NFPA 25 Inspection, Testing and Maintenance Standard

Features & Benefits:

• Fire Protection System Security: Relieves excess pressure in fire distribution networks, preventing damage from thermal expansion and pressure surges.
• Adjustable Pressure Control: Standard pilot spring range of 50-200 psi allows customized pressure relief settings to match system requirements.
• Drip-Tight Operation: Direct-acting spring-loaded diaphragm design closes tightly within close limits once upstream pressure drops below set pressure.
• Easy Installation & Maintenance: Can be installed in any position with no packing glands or stuffing boxes, simplifying installation and reducing maintenance needs.

FAQ

Q: What is the difference between the standard and high-pressure range models?

A: The standard Wilkins 12-P4000A has an adjustable pressure range of 50-200 psi, while the P4000AHR high-pressure variant offers a range of 150-300 psi for systems requiring higher relief pressures.

Q: Can this valve be used in potable water systems?

A: The Wilkins 12-P4000A is specifically designed and certified for fire protection systems. It features FDA-approved EPDM rubber and is UL Listed and FM Approved for fire protection applications.

Q: What is the maximum inlet pressure and temperature rating for this valve?

A: The maximum inlet pressure is 300 psi, and the temperature rating for water is 33°F to 140°F, making it suitable for standard fire protection system conditions.

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