Installation Guide

#1 SPRING
POPPET
ASSEMBLY
#2 SPRING
POPPET
ASSEMBLY
OUTLET BALL
VALVE
NO. 1 CHECK
VALVE COVER
NO. 2 CHECK
VALVE COVER
COVER O-RING
COVER O-RING
NO. 3 TEST COCK
NO. 4 TEST COCK
INLET BALL
VALVE
NO. 1 TEST COCK
NO. 2 TEST COCK
TEST COCK CAP
SEAT O-RING
CHECK SEAT
SCREW
SEAL RING
RETAINER
SEAL RING
POPPET
GASKET
Maintenance Instructions
ZURN WILKINS
1747 Commerce Way, Paso Robles, CA 93446 Phone:[phone] Fax:[phone]
3
CHECK ASSEMBLY
FIGURE 1 FIGURE 2 FIGURE 3
(Shown with optional
union ball valves)
All Model 950XLT2 Double Check Valve Backow Preventers must
be inspected and maintained by licensed personnel at least once
a year or more frequently as specied by local codes. Replace-
ment of worn or damaged parts must only be made with genuine
“ZURN WILKINS” parts.
GENERAL MAINTENANCE
1. Clean all parts thoroughly with water after disassembly.
2. Carefully inspect rubber seal rings and o-rings for damage.
3. Test unit after reassembly for proper operation (refer to
“TESTING PROCEDURES”).
SERVICING CHECK VALVES
1. Close inlet and outlet shut-off valves.
2. Open No. 2, No. 3 and No. 4 test cocks to release pressure
from valve.
3. Unscrew check valve cover using appropriate sized wrench.
CAUTION: COVER IS SPRING LOADED. To avoid injury,
hold cover down rmly with one hand while unscrewing.
4. Remove cover, spring and poppet assembly.
5. Inspect the rubber seal ring for cuts or embedded debris.
6. To remove seal ring, remove screw and seal retainer.
7. If the reverse side of the seal ring is unused, it is possible to
invert the seal ring. This would be considered a temporary
solution to xing a fouled check and should be replaced with
a new seal ring as soon as possible.
8. Inspect the valve cavity and seating area. Remove any
debris.
9. If necessary, unscrew seat from body and replace with new
seat and lightly greased o-ring (For seat removal assis-
tance, contact factory).
10. Reverse the above procedures to reinstall check valve as-
semblies and access cover, making sure the 3 test cocks
remain open.
SCREW
SEAL RING
SEAL RETAINER
POPPET
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