Safer Choice Standard

Zurn Industries, LLC | Wilkins
1747 Commerce Way, Paso Robles, CA U.S.A. 93446  Ph. 855-663-9876, Fax [phone]
In Canada | Zurn Industries Limited
3544 Nashua Drive, Mississauga, Ontario L4V 1L2  Ph. 905-405-8272, Fax [phone]
www.zurn.com
Rev. K
Date: 11/16
Document No. ACV-ZW205
Product No. Model ZW205
Model ZW205
Pressure Relief / Pressure Sustaining Valve
Page 1 of 4
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NSF/ANSI 61
DIRECTION OF FLOW
Application
The Zurn Wilkins Model ZW205 Pilot Operated Pressure Re-
lief / Pressure Sustaining Valve is designed for applications
where it is critical to maintain a pre-determined upstream
pressure. The pilot assembly reacts to changes in upstream
pressure allowing the main valve to modulate between the
closed and open position, maintaining desired upstream set
pressure. As long as the upstream pressure is below the set
point of the pilot assembly, the main valve will stay in the
closed position (sustaining); however, once the upstream
pressure exceeds the set point of the pilot assembly, the
main valve will open and relieve the excess pressure (relief).
Standards Compliance:
• ANSI/AWWA C530
• Meets the requirements of NSF/ANSI 61*
*(0.25% MAX. WEIGHTED AVERAGE LEAD CONTENT)
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
Standard Features
c Blue Epoxy Coated, FDA Approved
c Pilot Assembly
• “Wye” Type Strainer
• Closing Speed Control (sizes 1 1/4" - 4")
• Isolation Valves
c Inlet Pressure Gauge
c ANSI Class 150 Flanges
c Copper Tubing and Brass Fittings
Temperature Rating: c Water 33°F to 140°F
Pilot Spring Range: c 50-200 psi
Schematic Diagram
Item Description of Standard Features
1 Main Valve
2 850XL Isolation Valve
3 SXL "Wye" Type Strainer
4 Pressure Gauge
5 Restriction Fitting
6 Closing Speed Control
7 PV-RLF Pressure Relief Valve
Options
(Add suffix letters to ZW205)
Function
c C - 40XL2 Hydraulic Check with Isolation Valve
c L - SC1 Closing Speed Control (Standard 1 1/4" - 4")
c O - SC1 Opening Speed Control
Body
c A - Angle Style Body
c R - Reduced Port Body
Connections
c G - IPS Grooved
c TH - NPT Threaded
c Y - ANSI Class 300 Flanges
Main Valve Options
c Z - ZPI Visual Position Indicator
Pilot System
c LP3 - 5-15 psi Low Pressure Range PV-RLF Pilot
c LP2 - 10-35 psi Low Pressure Range PV-RLF Pilot
c LP - 30-90 psi Low Pressure Range PV-RLF Pilot
c HP - 150-300 psi High Pressure Range PV-RLF Pilot
c ST - Stainless Steel Tubing (“included with SP
option, only replaces Copper Tubing”)
c SP - All Stainless Steel Pilotry (replaces all brass
fittings, pilot valve and copper tubing.
“GL” Option included)
c SH - Stainless Steel Braided Hoses (only replaces
Copper Tubing)
c RV - Pilot on Reverse Side
c GL - Liquid Filled Gauge
BODY CONFIGURATIONS GLOBE STYLE BODY
ANGLE
STYLE
BODY
END CONNECTION PRESSURE RATING
FULL
PORT
REDUCED
PORT
Threaded
400 psi max.
1 1/4"-3" n/a 1 1/4"-3"
Flanged
ANSI Class 150, 250 psi max.
1 1/2"-16" 3"-10" 1 1/2"-10"
ANSI Class 300, 400 psi max.
Grooved
300 psi max.
1 1/2"-10" n/a 1 1/2"-10"
MINIMUM INLET PRESSURE 10 PSI