The Wilkins 34-NR3XLDU is a lead-free water pressure reducing valve with integral by-pass check valve and strainer, designed for potable water systems requiring reliable pressure control and thermal expansion protection.

Key Specifications:

• Size: 3/4 Inches
• Maximum Working Water Pressure: 400 psi
• Maximum Working Water Temperature: 140°F
• Notable Certifications: ASSE 1003, IAPMO, CSA
• End Connections: Double Union FNPT

Other Related Variants:

• 12-NR3XLDU: 1/2 Inch version
• 1-NR3XLDU: 1 Inch version
• 114-NR3XLDU: 1 1/4 Inch version
• 112-NR3XLDU: 1 1/2 Inch version
• 2-NR3XLDU: 2 Inch version

Materials:

• Main Valve Body: Low Lead Cast Bronze ASTM B 584
• Bell Housing: UV Resistant Polymer Composite
• Internals: 300 Series Stainless Steel
• Stem: Low Lead Brass
• Elastomers: EPDM (FDA approved) and Buna Nitrile (FDA approved)
• Cartridge: Delrin
• Springs: 302 Stainless Steel
• Strainer Screen: 300 Series Stainless Steel

Typical Installation:

The Model NR3XL may be installed in any position. The assembly shall be installed with sufficient side clearance for testing and maintenance. Multiple installations are recommended for wide demand variations or where the desired pressure reduction is more than 4 to 1. Anytime a reducing valve is adjusted, a pressure gauge must be used downstream to verify correct pressure setting. Do not bottom adjustment bolt on bell housing.

Standards Compliance:

ASSE Listed 1003; IAPMO Listed; CSA Certified; NSF/ANSI/CAN 61 (0.25% Max Weighted Average Lead Content)

Features & Benefits:

• Integral By-Pass Check Valve: Prevents buildup of excessive system pressure caused by thermal expansion, providing comprehensive water system protection.
• Balanced Piston Design: Enables smooth and responsive reaction to changes in system flow demand while providing protection from inlet pressure changes.
• Accessible Maintenance: The assembly can be serviced and maintained without removing the device from the line, reducing downtime and installation complexity.
• Integrated Strainer: Built-in 300 Series stainless steel strainer protects the valve from sediment and debris, making it ideal for residential and commercial water systems.

FAQ

Q: What pressure reduction ratio is recommended for the Zurn 34-NR3XLDU?

A: Multiple installations are recommended for wide demand variations or where the desired pressure reduction exceeds a 4:1 ratio (for example, reducing 200 psi inlet to 50 psi outlet).

Q: Can this valve be installed in any orientation?

A: Yes, the Zurn 34-NR3XLDU may be installed in any position. However, sufficient side clearance must be provided for testing and maintenance access.

Q: How do I adjust the pressure setting on this valve?

A: Always use a downstream pressure gauge to verify the correct pressure setting when adjusting the valve. Do not bottom the adjustment bolt on the bell housing. The valve comes factory preset to 50 psi with an adjustable range of 15 to 75 psi.

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