User Guide

3
Material/Tool Requirements:
• #3Phillipsscrewdriveror
5
/16" diameter rod, length sufficient
to span diameter of check, see Figures A and B.
•
1
/2" – 13 x 5" fully threaded hex bolt (Service bolt).
•
3
/4" open end or socket wrench.
Instructions:
Prior to servicing any Watts valve, it is
mandatory to shut down the water system by
closing both the inlet and outlet shutoff
valves. After shutoff valves are
closed, open test cock #2, #3 & #4 to
relieve pressure within the backflow assembly.
1. After #3 test cock has been opened to
relieve pressure, remove #3 test cock from
housing. When repairing an 8" or 10" (200 – 250mm) device,
remove both Victaulic couplers from body. Slide the down-
stream Victaulic coupler gasket to the downstream side of
the housing. The upstream Victaulic coupler gasket stays in
place.
2. Remove check/s to be serviced.
3. Locate the service hole and thread in the service bolt by
hand until it contacts the linkage. (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. (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
1
/4"
(6mm). (Figure B)
6. Back out the service bolt until load is transferred to the screw-
driver. Continue to back out the service bolt until sufficient
clearance is achieved to remove the complete spring mecha-
nism.
7. To disconnect linkage, remove retaining clip and pin (store in
a safe location for reinstallation).
8. To remove spring mechanism, grasp the screwdriver at the
center and pull complete assembly straight out and store in
a safe place.
9. Reinstall in reverse order.
WARNING:
While the spring mechanism is removed for check servicing;
never pull the screwdriver out or off the support notches on the
arbors. Doing so may cause bodily injuries.
Maintenance Instructions
Series 757, 757DCDA & LF757DCDA
8" – 10" (200 – 250mm)
Figure A
Figure B
Service Hole
ORDERING NO. SIZE DISC MODEL
in. mm
1st Check Kits
7018128 2
1
⁄2 - 4 65-100 RED SILICONE RK 757/757DCDA CK1
7018131 6 150 RED SILICONE RK 757/757DCDA CK1
7018134 8 200 RED SILICONE RK 757/757DCDA CK1
0899200 10 250 RED SILICONE RK 757/757DCDA CK1
Kit consists of: First check module, Check module O-ring and Disc elastomer
2nd Check Kits
7018130 2
1
⁄2 - 4 65-100 RED SILICONE RK 757/757DCDA CK2
7018133 6 150 RED SILICONE RK 757/757DCDA CK2
0899206 8 200 RED SILICONE RK 757/757DCDA CK2
0899201 10 250 RED SILICONE RK 757/757DCDA CK2
Kit consists of: Second check module, Check module O-ring and Disc elastomer
ORDERING NO. SIZE DISC MODEL
in. mm
1st or 2nd Check Rubber Parts Kits
0899202 2
1
⁄2 - 4 65-100 RED SILICONE RK 757/757DCDA RC4
0899203 6 150 RED SILICONE RK 757/757DCDA RC4
0899204 8 200 RED SILICONE RK 757/757DCDA RC4
0899205 10 250 RED SILICONE RK 757/757DCDA RC4
Kit consists of: Check module O-ring, Disc elastomer and E-clip
Check Sleeve Cover Kits
0899211 2
1
⁄2 - 4 65-100 – RK 757/757DCDA C
0899212 6 150 – RK 757/757DCDA C
0899213 8 200 – RK 757/757DCDA C
0899214 10 250 – RK 757/757DCDA C
Kit consists of: Closure sleeve, Sleeve O-ring and Gasket
Sleeve O-ring and Gasket
Check Module O-ring
First Check Module
Closure Sleeve Test Cock
with O-ring
Closure Sleeve
E-clip
Disc Elastomer
Second Check Module
LEAD FREE
*
LEAD FREE
*
LEAD FREE
*
LEAD FREE
*
Repair Kits
*The wetted surface of this product contacted by consumable
water contains less than 0.25% of lead by weight.