Specification

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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. N
Date: 3/18
Document No. ACV-ZW209BP
Product No. Model ZW209BP
Model ZW209BP
Pressure Reducing Valve with Low Flow By-Pass
Standard Features
 Blue Epoxy Coated, FDA Approved
 Pilot Assembly
 “Wye” Type Strainer
 Opening Speed Control (sizes 1 1/4" - 4")
 Isolation Valves
 Inlet and Outlet Pressure Gauges
 ANSI Class 150 Flanges
 Copper Tubing and Brass Fittings
 Low-Flow By-Pass Valves: 1/2" PRXL (sizes 1 1/4" -3)
3/4" NR3XL-BP (size 4")
Options
(Add suffix letters to ZW209BP)
Function
 C - 40XL2 Hydraulic Check with Isolation Valve
 L - SC1 Closing Speed Control*
 O - SC1 Opening Speed Control (Standard 1 1/4" - 4")
Body
 A - Angle Style Body
 R - Reduced Port Body
Connections
 G - IPS Grooved
 TH - NPT Threaded
 Y - ANSI Class 300 Flanges
 Main Valve Options
 V - Viton Rubber Internals, Rated 180°F (only avail-
able with "LP" or "HP" options)
 Z - ZPI Visual Position Indicator
Pilot System
 HP - 30-300 psi High Pressure Range PV-PRD Pilot
(replaces PRXL)
 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. “GL” Option included)
 SH - Stainless Steel Braided Hoses (only replaces
 Copper Tubing)
 GL - Liquid Filled Gauge
DIRECTION OF FLOW
Application
The Zurn Wilkins Model ZW209BP Pilot Operated Pressure
Reducing Valve with Low Flow By-pass is designed for many
applications where the reduction of high inlet pressures to
safe and stable outlet pressure is required. The pilot assem-
bly reacts to changes in downstream pressure allowing the
main valve to modulate between the open and closed position
ensuring a constant downstream set pressure. Once the
downstream pressure reaches the pilot setting, the main
valve will seal shut. When the main valve closes, the low flow
bypass is set to a slightly higher pressure which allows it to
handle very low flows up to 10 GPM when there is off peak
demand. (An additional bypass may be needed to handle
flows between the bypass and main valve minimum flow.) In
addition the Model ZW209BP comes standard with blue ep-
oxy coating internally and externally for corrosion protection
as well as isolation valves and pressure gauges for quick and
easy maintenance or repair.
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
*The closing speed control (optional) on this valve should
always be open at least three (3) turns off its seat.
7
6
5
3
L
2
4
4
4
2
2
2
Z
C
C
C
O
FLOW
1
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 PRXL Pressure Reducing Control
7 PRXL Pressure Reducing Control By-Pass
NSF/ANSI 61
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"-4" 3"-6" 1 1/2"-4"
ANSI Class 300, 400 psi
max.
Grooved
300 psi max.
1 1/2"-4" n/a 1 1/2"-4"
MINIMUM INLET PRESSURE 10 PSI
MAXIMUM HOT WATER TEMPERATURE 140F