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The Wilkins 4-ZW209BP is a pilot-operated pressure reducing valve with integrated low-flow bypass, designed to reduce high inlet pressures to stable outlet pressures in commercial and municipal applications.

Key Specifications:

• Size: 4 Inches
• Pressure Rating: ANSI Class 150, 250 psi max
• Temperature Rating: 33°F to 140°F
• Notable Certifications: NSF/ANSI/CAN 61; ANSI/AWWA C530
• Connection Type: ANSI Class 150 Flanges

Other Related Variants:

• 112-ZW209BP: 1 1/2 Inches version
• 2-ZW209BP: 2 Inches version
• 212-ZW209BP: 2 1/2 Inches version
• 3-ZW209BP: 3 Inches version

Materials:

• Ductile Iron Body (ASTM A536)
• Ductile Iron Bonnet (ASTM A536)
• Stainless Steel Disc Guide
• Stainless Steel Seat
• Stainless Steel Stem
• Stainless Steel Spring
• Buna-N Rubber Disc
• Nylon Reinforced Buna-N Diaphragm
• Copper Tubing
• Brass Fittings
• Blue Epoxy Coating (FDA Approved)

Typical Installation:

The Zurn 4-ZW209BP is commonly used in buildings where 1-15 GPM low flows are common during off-peak usage. Ideal for applications requiring reduction of high inlet pressures to safe and stable outlet pressure in commercial buildings, municipal water systems, and industrial facilities. Recommended installation orientation is horizontal with valve cover up.

Standards Compliance:

ANSI/AWWA C530; NSF/ANSI/CAN 61 (0.25% MAX. WEIGHTED AVERAGE LEAD CONTENT); FDA Approved Epoxy Coating

Features & Benefits:

• Integrated Low-Flow Bypass: Handles flows up to 10 GPM (1/2" PRXL on sizes 1 1/4"-3", 3/4" NR3XL-BP on 4") during off-peak demand without requiring main valve operation.
• Complete Installation Package: Includes wye strainer, isolation valves, inlet/outlet pressure gauges, and all necessary fittings for quick installation and easy maintenance.
• Corrosion Protection: Blue epoxy coating on all internal and external ferrous surfaces provides superior corrosion resistance and extends valve lifespan.
• Precise Pressure Control: Field adjustable pilot spring range of 15-120 psi ensures constant downstream pressure with responsive modulation between open and closed positions.

FAQ

Q: What is the minimum inlet pressure required for the Wilkins 4-ZW209BP?

A: The minimum inlet pressure is 10 psi higher than the set point or the additional body friction loss at intended flow, whichever is higher.

Q: What is the flow capacity range for the 4-ZW209BP?

A: The main valve handles 50-800 GPM continuous (up to 1000 GPM intermittent), while the integrated low-flow bypass handles 1-20 GPM.

Q: Can the Zurn 4-ZW209BP be installed vertically?

A: No, the recommended installation orientation is horizontal with the valve cover up. Vertical installation is not recommended due to difficulty in properly bleeding air and performing maintenance.

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