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

Item Number: 8-ZW205FPG
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$22,555.89
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When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Wilkins
  • Product Type: Pilot Operated Pressure Relief / Pressure Sustaining Valve
  • Valve Size: 8 inch
  • Body Style: Globe
  • End Connection: ANSI Class 150 Flanged
  • Body Material: Ductile Iron ASTM A536
  • Seat Material: Stainless Steel
  • Standard Pilot Spring Range: 50-200 psi
  • Coating: Blue Epoxy, FDA Approved

Description

The Zurn Wilkins Model ZW205 is an 8-inch pilot-operated pressure relief and pressure sustaining valve, designed to precisely control upstream pressure in fire safety and industrial applications. This globe-style valve features ANSI Class 150 flanged connections and a durable Ductile Iron ASTM A536 body with blue epoxy coating. Key components like the seat, stem, and disc guide are stainless steel. It maintains a standard pilot spring range of 50-200 psi, ensuring reliable pressure management. The ZW205 is lead-free and certified to NSF/ANSI/CAN 61 and ANSI/AWWA C530 standards. Item number 8-ZW205FPG.

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Connections

  • This 8 inch Zurn Wilkins ZW205 valve features ANSI Class 150 Flanges for connection into pipeline systems.
  • The pilot system is equipped with standard Copper Tubing and Brass Fittings.

Installation Orientation

For this 8 inch valve, the recommended installation orientation is horizontal with the valve cover positioned upwards. This ensures proper air bleeding from the cover and facilitates maintenance procedures. Installing 6" and larger valves vertically can lead to difficulties with air removal and service.

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Additional Details

The Zurn Wilkins Model ZW205 is a pilot-operated pressure relief and pressure sustaining valve designed to maintain a predetermined upstream pressure in critical applications. It modulates between closed and open positions to relieve excess pressure or sustain a desired upstream set pressure.

Construction & Materials

  • Main Valve Body and Bonnet are constructed from Ductile Iron ASTM A536.
  • Disc Guide, Seat, Stem, and Spring are made of Stainless Steel.
  • The Disc is Buna-N Rubber, and the Diaphragm is Nylon Reinforced Buna-N.
  • All internal and external ferrous surfaces are coated with Blue Epoxy for corrosion resistance, which is also FDA Approved.
  • Standard pilot system features Copper Tubing and Brass Fittings.

Standard Features

  • Includes a "Wye" Type Strainer for debris protection.
  • Features an integral Closing Speed Control (for sizes 1 1/4" - 4").
  • Equipped with Isolation Valves and an Inlet Pressure Gauge.
  • Designed with ANSI Class 150 Flanges for connection.

Operation

The valve's pilot system senses upstream pressure. If upstream pressure exceeds the pilot's preset set point (50-200 psi standard range), the pilot and main valve open to relieve excess pressure. When upstream pressure returns to acceptable limits, the valve closes. An adjustable flow control valve provides quick opening and slow closing for surge protection.

Caution: For 6" and larger valves, the recommended installation orientation is horizontal with the valve cover up to ensure proper air bleeding and maintenance.

Specifications

  • Product Type: Pilot Operated Pressure Relief / Pressure Sustaining Valve
  • Model: ZW205
  • Valve Size: 8 inch
  • Body Style: Globe
  • End Connection: ANSI Class 150 Flanged
  • Main Valve Body Material: Ductile Iron ASTM A536
  • 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
  • Coating: Blue Epoxy, FDA Approved
  • Standard Pilot System: Copper Tubing and Brass Fittings
  • Standard Pilot Spring Range: 50-200 psi
  • Minimum Inlet Pressure: 10 PSI
  • Temperature Rating: Water 33°F to 140°F

Certificates & Approvals

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

FAQs

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

The ZW205 functions as both a pressure relief and a pressure sustaining valve. It's designed to maintain a predetermined upstream pressure by either relieving excess pressure or sustaining a desired set pressure in the system.

What are the key materials used in the construction of this 8-inch ZW205 valve?

The main valve body and bonnet are Ductile Iron ASTM A536, while the disc guide, seat, stem, and spring are stainless steel. The disc is Buna-N rubber, and the diaphragm is nylon reinforced Buna-N. All ferrous surfaces are blue epoxy coated.

What type of connections does the 8-ZW205FPG model use?

This specific model uses ANSI Class 150 Flanged connections, making it suitable for integration into systems requiring this standard flange type.

What are the temperature and pressure ratings for this valve?

The valve is rated for water temperatures from 33°F to 140°F. It has a minimum inlet pressure requirement of 10 PSI, and the standard pilot spring range is 50-200 psi.

What certifications does the Zurn Wilkins ZW205 hold?

The ZW205 is compliant with ANSI/AWWA C530 and meets the requirements of NSF/ANSI/CAN 61 for lead-free content (0.25% maximum weighted average lead content).

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