Zurn Wilkins ZW207 Installation, Troubleshooting, Maintenance Instructions

Model ZW207
Excess Pressure Shutdown 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  Troubleshooting  Maintenance Instructions

Installation / Start-up

NOTE: Flushing of all pipe lines is to be performed to remove
all debris prior to installing valve.
1. For making adjustments and servicing allow for adequate space
around the valve before installing valve.
2. When installing a ZW207, gate valves installed prior to the
ZW209 and after the ZW207 are recommended for maintenance
allowing for isolation of valves.
3. Position the valve in line matching the direction of flow as indi-
cated on the valve model tag with the proper direction of flow in the
system. Connect a drain line to the discharge orifice (green fitting)
in the valve pilotry, as water will discharge when the valve closes.
Note: Do not remove the discharge orifice fitting. The ZW207
will not operate correctly without the fitting. The end connec-
tion of the discharge fitting is a standard 3/8", 45 degree, flare.
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 vertical
and horizontal positions. However, it is recommended that ZW207
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 acces-
sibility during annual inspections, and maintenance.
ZW207 SCHEMATIC
STANDARD COMPONENTS
1 Main Valve
2 850XL Isolation Valve
3 SXL "Wye" Type Strainer
4 Pressure Gauge
5 Restriction Fitting
6 PV-RLF Pressure Relief Valve
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LEAD-FREE*
BODY FLOWS BACKWARD
OPTIONAL FEATURES
C 40XL2 Hydraulic Check w/
Isolation Valve
Z ZPI Valve Position Indicator
1747 Commerce Way, Paso Robles, CA 93446 Phone:855-663-9876 Fax:805-238-5766
START-UP
CAUTION: To prevent personnel injury and damage to equip-
ment 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. Start-up and set the outlet pressure for the ZW209 before the
ZW207.
Note: Close the inlet isolation ball valve on the ZW207 pi-
lotry so the valve will open freely during ZW209 start-up.
2. The ZW207 should be pressurized and filled with water from
the ZW209 Start-Up procedure, but the ZW207 pilotry will need
to be filled. 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. To fill the valve cover and pilotry system, open isolation valves
(2) in the pilot system of the ZW207(see ZW207 schematic) and
back the adjustment screw out all the way on the pilot valve so
the cover can start filling with water. Note: Water will discharge
out of the orifice at this time unless the inlet pressure is too
low. Increase the inlet pressure until water starts to discharge
from the orifice. At this time it is necessary to bleed the cover.
Open the top plug on the cover and top fittings of the pilotry.
Open the inlet shut off valves enough so you can see water and
air coming out of the cover and pilotry. Wait until only water is
coming out then tighten fittings and plugs. 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. Turn the ZW207 pilot (relief pilot) adjustment screw clockwise
until the pilot spring is compressed completely.
5. At this point with the upstream shutoff valve open, slowly
open the downstream shut off valve if not already open. Flow
will begin to occur and eventually stabilize.
6. Next it is advisable to flow water through the valve to ensure
all air has escaped from system. With water flowing through the
valve, set the ZW209 pressure reducing pilot 10 to 15 psi higher
than the desired pressure reducing set pressure so the ZW207
pilot can be set. To adjust the pressure reducing pilot, loosen jam
nut on adjustment screw and either turn adjustment screw in (to
increase outlet pressure) or out (to decrease outlet pressure).
7. Now set the ZW207 pilot. With water flowing through the
main valve, start to slowly turn the pilot adjustment screw
counterclockwise until the ZW207 starts to close(downstream
pressure will significantly decrease). At this point the ZW207 is
set at the current downstream pressure. Tighten the jam nut on
the ZW207 pilot valve.
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ZURN WILKINS
1
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