Zurn Wilkins ZW209H Manual

Model ZW209H
Pressure Reducing and Pressure Sustaining Valve
Globe and Angle Pattern Bodies
1 1/4", 1 1/2", 2", 2-1/2", 3", 4", 6", 8", 10", 12", 14" & 16"
*Contains a weighted average lead content less than 0.25% for wetted surfaces
Installation

Installation / Start-up
NOTE: Flushing of all pipe lines is to be performed to remove
all debris prior to installing valve.
NOTE: If installation is subject to very low flow or potentially
static conditions it is recommended a pressure relief valve
(1/2" minimum) be installed downstream of the pressure
reducing valve for additional system protection.
1. For making adjustments and servicing allow for adequate space
around the valve before installing valve.
2. When installing a ZW209H, gate valves installed on both inlet
and outlet are recommended for maintenance allowing for isolation
of valve.
3. Position the valve in line matching the direction of flow as
indicated on the valve model tag with the proper direction of flow
in the system. Once attached to line, double check all fasteners/
bolts in the pilot system and on main valve are tight and there is
no damage prior to pressurizing system.
NOTE: Pressure in some applications can be very high so be
thorough in checking and inspecting for proper installation
and makeup.
4. Zurn Wilkins valves are designed to operate in both the verti-
cal and horizontal positions. However, it is recommended that
ZW209H 6" and larger, be installed in the horizontal position. The
horizontal positioning of the larger valves avoids premature wear
due to the mass of plunger assemblies as well as allows for greater
accessibility during annual inspections, and maintenance.
ZW209H SCHEMATIC
STANDARD COMPONENTS
1 Main Valve
2 850MXL Isolation Valve
3 SXL Wye Type Strainer
4 Pressure Gauge
5 Restriction Tube Fitting
6 PRXL Pressure Reducing Control
7 PV-RLF Pressure Relief Valve
START-UP
CAUTION: To prevent personnel injury and damage to equipment
check that downstream venting is adequate prior to start-up
and test procedures. All adjustments under pressure should
be made slowly while under flowing conditions. If the main
valve closes too fast it may cause surging in upstream piping.
1. Open isolation valves (2) in the pilot system (see ZW209H
schematic).
2. Then slowly open the upstream shutoff valve only enough to
fill main valve assembly and pilot system.
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LEAD-FREE*
Troubleshooting

OPTIONAL FEATURES
C 40XL2 Hydraulic Check w/
Isolation Valve
L SC1 Closing Speed Control
O SC1 Opening Speed Control
Z ZPI Valve Position Indicator
1747 Commerce Way, Paso Robles, CA 93446 Phone:855-663-9876 Fax:805-238-5766
Maintenance Instructions

Prior to pressurizing the valve assembly it is also recommended
that a ZPI valve position indicator be installed to aid in verifying
proper valve movement.
3. As the valve is filling with water, it is necessary to bleed the
main valve and pilot system of air. To vent air, partially open or
loosen the highest plugs or fittings in the system. The ZPI valve
position indicator is a great location, as it has a test cock at the
top to vent air pressure. It may be necessary to bleed system
more than once. After removal of air in the system tighten all
loose fittings. NOTE: If valve is installed vertically, it will be
necessary to loosen some upper cover bolts until you have
vented all the air from the cover chamber.
4. Before setting valve, if valve is equipped with SC1 Flow con-
trols (O or L on ZW209H schematic) it is necessary to back out
the set screw a minimum of 3 turns from initial set point.
5. Turn the relief pilot adjustment screw counterclockwise until
the screw starts to spin freely to lower the relief pressure so the
pressure reducing pilot can be set first.
6. At this point with the upstream shutoff valve partially open,
slowly open the downstream shut off valve. Flow will begin to
occur and pressure should build up in valve and eventually
stabilize.
7. Next it is advisable to flow water through the valve to ensure
all air has escaped from system. With water flowing through the
valve the Zurn Wilkins PRV pilot can be set to the desired pres-
sure. To adjust the pressure reducing pilot, loosen jam nut on ad-
justment screw and either turn adjustment screw in (to increase
outlet pressure) or out (to decrease outlet pressure). Tighten jam
nut on pilot when the desired setting has been made.
8. To verify proper operation of ZW209H close and open down-
stream shut off valve several times to ensure downstream pres-
sure is stable at set pressure.
9. Next the relief/sustaining pilot must be set at the desired
sustaining pressure. With water still flowing through the main
valve use the upstream isolation valve to throttle water flow into
the ZW209H. Close the upstream isolation valve until the inlet
pressure at the ZW209H is below the desired sustaining set
pressure.
10. With water flowing through the ZW209H start to turn the
relief/sustaining pilot adjustment screw clockwise until the valve
starts to modulate and the inlet pressure starts to increase.
Continue turning the adjustment screw clockwise until the inlet
pressure is at the desired set pressure.
11. If the inlet pressure cannot be adjusted lower than the
desired set relief/sustaining pressure then set the relief valve
by turning the adjustment screw clockwise until the spring is
fully compressed. The control valve will close. Next, slowly
turn the adjustment screw counterclockwise until water starts
to flow through the control valve. Now the relief valve is set to
the current inlet pressure. Use the table on the next page to set
the relief pressure at a different pressure than the current inlet
pressure. Turn the adjustment screw clockwise to increase set
pressure or counterclockwise to decrease set pressure. Add or
subtract from the current inlet pressure by turning the adjustment
screw the number of turns required to reach the desired set
pressure based on the adjustment table.
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ZURN WILKINS
1
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