Installation Guide

Model 950XL3 LEAD-FREE*
Double Check Valve Assembly (3/4”, 1”, 1 1/4”, 1 1/2” & 2”)
*This product contains a weighted average lead content less than 0.25% for wetted surfaces.
*Meets the requirements of NSF/ANSI/CAN 61 and 372
INSTALLATION INSTRUCTIONS
CAUTION: Installation of Backow Preventers must be performed by qualied, licensed
personnel. The installer should be sure the proper device has been selected for the
particular installation. Faulty installation could result in an improperly functioning device.
ZURN WILKINS Model 950XL3 Double Check Valve assemblies are for use on potable
water lines where a health hazard does not exist in the event of a backow situation.
Proper performance is dependent upon following these installation instructions and
prevailing governmental and industry standards and codes. Failure to do so, according
to ZURN WILKINS Limited Warranty "...releases ZURN WILKINS of any liability that it
might otherwise have with respect to that device." Such failure could also result in an
improperly functioning device.
Damage to the device could result wherever water hammer and/or water thermal ex-
pansion could create excessive line pressure. Where this could occur, shock arresters,
check valves and/or pressure relief valves should be installed downstream of the device.
If installation is in a pit or vault, the Backow Preventer must never be submerged in
water because this could cause a cross-connection. Make sure that the pit or vault always
remains dry by providing ample drainage.
1. Before installing a Model 950XL3 Backow Preventer, ush the line thoroughly to
remove all debris, chips and other foreign matter. If required, a lead-free strainer
should be placed upstream of the Backow Preventer. CAUTION: Do not use a
strainer in seldom used emergency waterlines such as re lines.
2. Provide adequate space around the installed unit so that the test cocks will be ac-
cessible for testing and servicing.
3. Install valve at least 12 inches above surrounding ood level.
4. Always consult local codes for installation methods, approvals and guidance.
ZURN WILKINS
1747 Commerce Way, Paso Robles, CA 93446 Phone: [phone] Fax: [phone]
 Installation  Testing  Maintenance Instructions
1
INDOOR INSTALLATION
Indoor installation is preferred in areas that
are subject to freezing conditions. All the
basic installation instructions apply to such
installations.
OUTDOOR INSTALLATION
The Model 950XL3 Backow Preventer
may be installed outdoors only if the device
is protected against freezing conditions.
Exposure to freezing conditions will result
in improper function or damage to the
device. The installation location must be
kept above 32°F. All the basic installation
instructions apply.
PLACING THE MODEL 950XL3 IN SERVICE
After the installation of a Model 950XL3 has
been completed, place the unit in service
as follows:
1. Start with both shut-o󰀨 valves closed.
Slowly open the inlet shut-o󰀨 valve
until the backow preventer is com-
pletely pressurized.
2. When the unit has been pressurized,
vent any trapped air by slightly open-
ing each of the four test cocks.
3. Slowly open the downstream shut-
o󰀨 valve. The Model 950XL3 Double
Check Valve assembly is now in
service.
4. After the Model 950XL3 has been
properly installed, test the device (see
“Testing Procedures”). If the device
fails the test, remove the check valve
assembly and thoroughly ush the
device. Clean rubber seals and seats
of all debris and place unit back in
service.
VERTICAL INSTALLATION
Vertical installation is acceptable in applica-
tions where inlet and outlet piping are ow-
ing vertically upwards. All the basic installa-
tion instructions apply to such installations.
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950XL3
WILKINS
180°F 82°C
175PSI 12BAR
B64.5
DIRECTION OF FLOW
12" MIN.
30" MAX.
DIRECTION OF FLOW
OPTIONAL LEAD-FREE STRAINER
(MODEL SXL)
PROTECTIVE
ENCLOSURE
(PROVIDED BY OTHERS)
WILKINS
XL
950XL3
WILKINS
180°F 82°C
175PSI 12BAR
B64.5
950XL3
WILKINS
180°F 82°C
175PSI 12BAR
B64.5
DIRECTION OF FLOW
DIRECTION OF FLOW
950XL3
WILKINS
180°F 82°C
175PSI 12BAR
B64.5
PARALLEL INSTALLATION
Where uninterrupted service from a single meter connection must be maintained, two
or more Backow Preventers may be connected in parallel. All the basic installation
instructions apply to parallel installation. Be sure to allow adequate room between the
units for testing and repair.