4 ZW205 RELIEF/SUSTA FIRE VLV ANG BODY ANSI 150 FLG SS SEAT CPR TUBNG BRZ FTNGS

Item Number: 4-ZW205FPA
1 1
$11,309.44
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Wilkins
  • Valve Size: 4 inch
  • Body Style: Angle
  • End Connection: ANSI Class 150 Flanged
  • Function: Pressure Relief / Pressure Sustaining
  • Pilot Spring Range: 50-200 psi
  • Body Material: Ductile Iron ASTM A536
  • Lead Content: NSF/ANSI/CAN 61 compliant
  • Coating: Blue Epoxy Coated, FDA Approved

Description

The Zurn Wilkins Model ZW205 is a 4 inch angle body pressure relief/pressure sustaining valve, essential for fire suppression systems and other applications requiring precise upstream pressure control. It quickly reacts to increases in upstream pressure, opening to relieve excess pressure and prevent system damage, then closing as water demand rises to maintain positive pressure on fire pumps. Featuring durable ductile iron construction with a blue epoxy coating and stainless steel internals, this ANSI Class 150 flanged valve ensures reliable performance. Its pilot system offers a standard relief range of 50-200 psi, along with a "wye" type strainer, isolation valves, and closing speed control for ease of maintenance and surge protection. Item number 4-ZW205FPA.

Help Me Connect

The Zurn Wilkins Model ZW205 Pressure Relief/Sustaining Valve is designed with 4 inch ANSI Class 150 Flanged end connections for installation into corresponding flanged piping systems.

This angle body valve should be installed horizontally with the valve cover up, especially for 6 inch and larger sizes, to ensure proper air bleeding and maintenance.

View full details

Additional Details

The Zurn Wilkins Model ZW205 is a 4 inch angle body pressure relief/pressure sustaining valve designed for critical applications requiring a pre-determined upstream pressure, such as in Fire Suppression Systems.

This valve effectively relieves high system pressure and prevents damage to piping, valves, and sprinklers while maintaining positive pressure on fire pumps. It features quick opening and slow closing capabilities to prevent upstream pressure surges.

Application & Function

  • Designed to modulate between closed and open positions to maintain desired upstream set pressure.
  • Relieves excess pressure when upstream pressure exceeds the set point.
  • Maintains positive pressure on fire pumps.
  • Closes as water demand increases to direct more water to fires.

Standard Features

  • Blue Epoxy Coated, FDA Approved finish for durability.
  • Includes a Pilot Assembly with "Wye" Type Strainer, Closing Speed Control (for sizes 1 1/4" - 4"), and Isolation Valves.
  • Comes with an Inlet Pressure Gauge and ANSI Class 150 Flanges.
  • Equipped with Copper Tubing and Brass Fittings.

Materials

  • Main Valve Body: Ductile Iron ASTM A536
  • Main Valve Bonnet: Ductile Iron ASTM A536
  • Disc Guide: Stainless Steel
  • Seat: Stainless Steel
  • Disc: Buna-N Rubber
  • Diaphragm: Nylon Reinforced Buna-N
  • Stem: Stainless Steel
  • Spring: Stainless Steel

Connections

  • End Connection: ANSI Class 150 Flanged
  • Valve Size: 4 inch
Caution: 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, with the valve cover up, due to the difficulty of properly bleeding air out of the cover and performing maintenance on valves installed in the vertical orientation.

Specifications

  • Model: ZW205
  • Valve Size: 4 inch (100mm)
  • Function: Pressure Relief / Pressure Sustaining
  • Body Style: Angle Style Body
  • End Connection: ANSI Class 150 Flanged
  • Pilot Spring Range: 50-200 psi
  • Temperature Rating: 33°F to 140°F (Water)
  • Minimum Inlet Pressure: 10 PSI

Main Valve Materials

  • Main Valve Body: Ductile Iron ASTM A536
  • Main Valve Bonnet: Ductile Iron ASTM A536
  • Disc Guide: Stainless Steel
  • Seat: Stainless Steel
  • Disc: Buna-N Rubber
  • Diaphragm: Nylon Reinforced Buna-N
  • Stem: Stainless Steel
  • Spring: Stainless Steel
  • Coating: Blue Epoxy Coated, FDA Approved

Certificates & Approvals

  • Standards Compliance: ANSI/AWWA C530
  • Lead Content: Meets NSF/ANSI/CAN 61 (0.25% MAX. WEIGHTED AVERAGE LEAD CONTENT)
  • Lead Free: Yes

FAQs

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

The ZW205 valve functions as both a pressure relief and pressure sustaining valve. It is designed to relieve excess upstream pressure to prevent system damage while also maintaining a pre-determined upstream pressure, especially in fire suppression applications.

What type of end connections does this 4 inch ZW205 valve have?

This specific 4 inch ZW205 model features ANSI Class 150 Flanged end connections. It is designed to be installed into corresponding flanged piping systems.

What materials are used for the main components of the ZW205 valve?

The main valve body and bonnet are constructed from Ductile Iron ASTM A536. Key internal components like the disc guide, seat, stem, and spring are made of Stainless Steel, while the disc is Buna-N Rubber and the diaphragm is Nylon Reinforced Buna-N.

Is the ZW205 valve suitable for potable water applications?

Yes, the ZW205 valve meets the requirements of NSF/ANSI/CAN 61 with a maximum weighted average lead content of 0.25%, making it lead-free and suitable for applications that require compliance with these standards.

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

The standard pilot spring range for the ZW205 valve is 50-200 psi. This range allows the valve to maintain the desired upstream set pressure or relieve excess pressure within this specified range.

Related Products

1 2