Installation Guide

Page 1 of 3
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: 5/19
Document No. ACV-ZW205FP
Product No. Model ZW205FP
Model ZW205FP
Fire Pump Relief Valve
DIRECTION OF FLOW
Application
The Zurn Wilkins Model ZW205FP Fire Relief Valve is designed
for Fire Suppression Systems to relieve high system pressures.
The pilot assembly reacts quickly to increase of upstream pres-
sure to prevent damage to system piping, valves, and sprinklers
while maintaining positive pressure on fire pumps. As the water
demand increases in the Fire Suppression System the Relief
Valve will start to close, directing more water to suppress fires.
The Relief Valve will maintain the upstream pressure at the
set pressure as long as maximum flow rates of the valve are
not exceeded. The Zurn Wilkins Model ZW205FP is designed
to open quickly and close slowly to prevent upstream pressure
surges. The Zurn Wilkins Model ZW205FP is available in both
globe and angle pattern bodies.
Standards Compliance:
• UL and ULC Listed
• FM® Approved
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
 Red Epoxy Coated, FDA Approved
 Pilot Assembly
• “Wye” Type Strainer
• Inlet Pressure Gauge (UL/FM)
• 3-Way Gauge Isolation Valve
 ANSI Class 150 Flanges
 Copper Tubing and Brass Fittings
Sizes
Globe & Angle
Threaded ends, ANSI B1.20.1  2" - 3" 300 psi max.
Flanged ends, ANSI B16.42  2" - 10"
 ANSI Class 150, 250 psi max.
 ANSI Class 300, 300 psi max.
Grooved ends, AWWA C606  2" - 10" 300 psi max.
Temperature Rating:  Water 33°F to 140°F
Pilot Spring Range:  50-200 psi (Standard)
 150-300 psi (Optional)
C
2
4
Z
C
5
3
1
FLOW
Options
(Add suffix letters to ZW205FP)
Function
 C - 40XL2 Hydraulic Check
Body
 A - Angle Style Body
Connections
 G - IPS Grooved (inlet rating 300 psi)
 TH - NPT Threaded (inlet rating 300 psi)
 Y - ANSI Class 300 Flanges (inlet rating 300 psi)
Main Valve Options
 Z - ZPI Visual Position Indicator
Pilot System
 HP - 150-300 psi High Pressure Range PV-RLF Pilot
 ST - Stainless Steel Tubing (included with SP option,
only replaces Copper Tubing)
 SP - All Stainless Steel Pilotry (replaces all brass
fittings, pilot valve and copper tubing)
 RV - Pilot on Reverse Side
Schematic Diagram
Item Description of Standard Features
1. Main Valve
2. SXL “Wye” Type Strainers
3. Pressure Gauge
4. Restriction Fitting
5. PV-RLF Pressure Relief Valve
Check on cover to keep cover full of water with vertical pump
that does not have suction check valve.
LISTED
FM
APPROVED