4 ZW205 FIRE PUMP RELIEF VALVE, CLASS 300, FLG X FLG

Item Number: 4-ZW205FPY
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$11,772.99
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When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Wilkins
  • Valve Type: Pilot Operated Pressure Relief / Pressure Sustaining Valve
  • Nominal Size: 4 inch
  • End Connections: Class 300 Flanged
  • Body Material: Ductile Iron ASTM A536
  • Pilot Spring Range: 50-200 psi
  • Blue Epoxy Coated, FDA Approved body
  • Wye Type Strainer, Isolation Valves, and Pressure Gauge included
  • Certified to NSF/ANSI/CAN 61 and ANSI/AWWA C530

Description

The Zurn Wilkins Model ZW205 is a 4-inch pilot-operated pressure relief and pressure sustaining valve designed for critical applications requiring stable upstream pressure. It features Class 300 flanged connections and a durable ductile iron body with an FDA-approved blue epoxy coating. Standard components include a wye type strainer, isolation valves, and an inlet pressure gauge to simplify setup and maintenance. The valve has a standard pilot spring range of 50 to 200 psi and is certified to NSF/ANSI/CAN 61 and ANSI/AWWA C530 for lead-free compliance. Item number 4-ZW205FPY.

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Connections

  • The 4-inch ZW205 valve is equipped with Class 300 flanged end connections, suitable for robust piping systems.

Installation Guidance

For optimal performance and ease of maintenance, the recommended installation orientation for Zurn Automatic Control Valves (ACVs), including the 4-inch ZW205, is horizontal with the valve cover facing upwards. This orientation facilitates proper air bleeding from the cover and simplifies any necessary maintenance procedures.

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Additional Details

The Zurn Wilkins Model ZW205 Pilot Operated Pressure Relief / Pressure Sustaining Valve is designed to precisely maintain a pre-determined upstream pressure in critical applications. This 4-inch valve modulates between closed and open positions to relieve excess pressure or sustain pressure as needed.

Operation

  • The valve's pilot system senses upstream pressure. If the upstream pressure is below the pilot assembly's set point, the main valve remains tightly closed to sustain pressure.
  • If upstream pressure exceeds the set point, the pilot and main valve open to relieve excess pressure.
  • An adjustable flow control valve provides quick opening for pressure relief and slow closing for surge protection.

Standard Features

  • Pilot System: Includes a "Wye" Type Strainer, Closing Speed Control (for sizes 1 1/4" - 4"), and Isolation Valves.
  • Includes an Inlet Pressure Gauge.
  • Pilot system features Copper Tubing and Brass Fittings.
  • Main valve body is coated with a Blue Epoxy Coated, FDA Approved finish.

Specifications

  • Valve Type: Pilot Operated Pressure Relief / Pressure Sustaining Valve
  • Nominal Size: 4 inch
  • End Connection: Class 300 Flanged
  • Body Style: Full Port Globe
  • Main Valve Body Material: Ductile Iron ASTM A536
  • Main Valve Body Coating: Blue Epoxy Coated, FDA Approved
  • Main Valve Bonnet Material: Ductile Iron ASTM A536
  • Disc Guide Material: Stainless Steel
  • Seat Material: Stainless Steel
  • Disc Material: Buna-N Rubber
  • Diaphragm Material: Nylon Reinforced Buna-N
  • Stem Material: Stainless Steel
  • Spring Material: Stainless Steel
  • Pilot System Tubing and Fittings: Copper Tubing and Brass
  • Temperature Rating: Water 33°F to 140°F
  • Pilot Spring Range: 50-200 psi (standard)
  • Minimum Inlet Pressure: 10 PSI
  • Approximate Weight: 130 lbs

Flow Characteristics (4-inch Full Port Globe)

  • Suggested Flow, Max. Continuous: 800 GPM
  • Suggested Flow, Max. Intermittent: 1000 GPM
  • Suggested Flow, Min. Continuous: 50 GPM

Certificates & Approvals

  • ANSI/AWWA C530
  • NSF/ANSI/CAN 61 (0.25% Max. Weighted Average Lead Content)
  • Lead Free

FAQs

What is the primary function of the Zurn Wilkins ZW205 valve?

The Zurn Wilkins ZW205 valve is a pilot-operated pressure relief and pressure sustaining valve. It is designed to maintain a pre-determined upstream pressure by either relieving excess pressure or sustaining pressure as needed.

What type of connections does this 4-inch ZW205 valve use?

This 4-inch ZW205 valve features Class 300 flanged connections, suitable for robust industrial and fire pump applications.

What materials are used for the main valve body and internal components?

The main valve body is made of Ductile Iron ASTM A536 with a blue epoxy coating. Internal components include stainless steel for the disc guide, seat, stem, and spring, and Buna-N rubber for the disc and nylon reinforced Buna-N for the diaphragm.

What is the standard pilot spring pressure range for this valve?

The standard pilot spring range for the Zurn Wilkins ZW205 valve is 50 to 200 psi. Other pressure ranges may be available as optional configurations.

Are there any specific installation guidelines for the ZW205?

Yes, the recommended installation orientation for Automatic Control Valves (ACVs) is horizontal, with the valve cover up. 6-inch and larger valves should only be installed horizontally to ensure proper air bleeding and ease of maintenance.

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