Watts 957 Serie Manual De Instalación Y Mantenimiento página 4

Maintaining the Check Modules
8" – 10"
Tool Requirements
• #3 Phillips screwdriver or
to span the diameter of the checks (See Figures A and B.)
• / " – 13 x 5 fully threaded hex bolt (service bolt)
1
2
• / " open end or socket wrench
3
4
Instructions
WARNING
!
Before servicing any Watts valve, shut down the water system
by closing both the inlet and outlet shutoff valves. This is
mandatory. After the shutoff valves are closed, open test
cocks No. 2, No. 3, and No. 4 to relieve pressure within the
backflow assembly.
1. After test cock No. 3 has been opened to relieve pressure,
remove the test cock from the housing. (When repairing an
8" or 10" device, remove both Victaulic couplers from the
body. Slide the downstream Victaulic coupler gasket to the
downstream side of the housing. The upstream Victaulic
coupler gasket stays in place.)
2. Remove the check(s) to be serviced.
3. Locate the service hole and thread in the service bolt by hand
until it contacts the linkage. (See Figure A.)
4. Continue to thread in service bolt with the wrench until the
service hole in the linkage is aligned with the service notches
on the spring arbors. (See Figure A.)
5. Insert the Phillips screwdriver through the arbors and service
hole of the linkage making sure that the tip of the screwdriver
extends past the ends of the arbors by a minimum of
(See Figure B.)
6. Loosen the service bolt until the load is transferred to the
screwdriver. Continue to loosen the service bolt until there is
sufficient clearance to remove the complete spring mechanism.
7. To disconnect the linkage, remove the retaining clip and pin.
Store both items in a safe location for reinstallation.
8. To remove the spring mechanism, grasp the screwdriver at
the center and pull the complete assembly straight out and
store in a safe place.
9. Reverse the order of these steps to reassemble the parts
and housing.
WARNING
!
While the spring mechanism is being removed, never pull
the screwdriver out or off the support notches on the
arbors. Doing so may cause bodily injuries.
4
/ " diameter rod, length sufficient
5
16
Service Hole
/ ".
1
4
Figure A
Figure B