Submittal Sheet

Page 3 of 4
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
7900 Goreway Drive, Unit 10, Brampton, Ontario L6T 5W6, 877-892-5216
www.zurn.com
Suggested flow calculations are based on flow through Schedule 40 Pipe. Maximum continuous flow is approx. 20 ft./sec (6.1
meters/sec) & maximum intermittent is approx. 25 ft./sec (7.6 meters/sec) and minimum continuous flow is approx. 1.25 ft./sec
(0.4 meters/sec). Many factors should be considered in sizing pressure reducing valves including inlet pressure, outlet pres-
sure and flow rates.
Operation
The Model ZW209 utilizes a pressure reducing pilot valve that installs on the discharge side of the control circuitry. The pilot is
a direct acting, normally open, spring loaded, diaphragm actuated valve. The operation of the ZW209 begins with accurately
sizing the valve, then fine tuning the control circuit by adjusting the pilot spring to the desired downstream pressure.
Inlet pressure is piped to the inlet port of the pressure reducing pilot. A sensing line runs internally from the discharge side of
the pilot to its lower control chamber under the diaphragm. Thus, downstream pressure exceeding the preset acts to close the
pilot while the adjustable spring seeks to keep it open. The result is a modulating action in the pilot that is transmitted to the
bonnet of the main valve. This creates a mirror modulation of the diaphragm assembly in the main valve. Downstream pres-
sure is maintained within narrow limits regardless of changing flow rates or varying inlet pressures.
Typical Installation
Notice:
In cases where design flow falls below the minimum continuous flow rate, a low flow by-pass shall be installed.
Specications
The Pressure Reducing Valve shall be a diaphragm actuated, pilot controlled valve. The main valve body shall be ductile iron
ASTM A 536. The stem of the basic valve shall be guided top and bottom. The diaphragm shall not be used as a seating surface.
All internal and external ferrous surfaces shall be coated with a high quality, fusion epoxy coating. The pilot control shall be field
adjustable from 15 psi to 150 psi. The valve shall be certified to NSF/ANSI Standard 61. The Pressure Reducing Valve shall be a
ZURN WILKINS Model ZW209.
DIRECTION OF FLOW
INLET SHUT-OFF
OUTLET SHUT-OFF
INLET SHUT-OFF
OUTLET SHUT-OFF
ZW209BP
ZW209
Full Port Globe
and
Angle Valve size
inches (mm)
1 1/4
(32)
1 1/2
(40)
2
(50)
2 1/2
(65)
3
(80)
4
(100)
6
(150)
8
(200)
10
(250)
12
(300)
14
(350)
16
(400)
Reduced Port
Globe Valve Size
inches (mm)
3
(80)
4
(100)
6
(150)
8
(200)
10
(250)
Suggested Flow
(GPM)
Max. Continuous
93 125 210 300 460 800 1800 3100 4900 7000 8400 11000
Max Intermittent
120 160 260 375 600 1000 2250 4000 6150 8700 10500 13800
Min. Continuous
10 10 15 20 30 50 115 200 300 435 530 690
Suggested Flow
(Liters/sec)
Max. Continuous
6 8 13 19 29 50 113 195 309 550 665 870
Max. Intermittent
7.6 10 16.4 23 37 62 142 246 388 440 530 95
Min. Continuous
.6 .6 0.9 1.3 1.9 3.2 7.2 13 19 28 33 43
Flow Characteristics