Watts LF719 - Manual (Page 3)

Service, Replacement Parts and Maintenance
Series 719 and LF719 Double Check Valve Assemblies
Servicing the First and Second Check Valves
NOTICE
Before servicing, be certain water is turned off or shutoff valves
are closed
1. Close shutoff valves up and downstream of the valve.
2. Using an appropriate sized wrench, loosen the check valve
cover. Unscrew the check valve cover and lift off.
3. Remove spring.
4. Lift out disc holder assembly from body of valve.
5. To reverse the seat disc, unscrew disc screw and disassem-
ble disc washer and disc rubber from disc holder assembly.
Reverse rubber so opposite face is showing. Assemble disc
screw through disc washer and rubber and screw into disc
holder.
6. To replace seat module, pull out of body by gripping at rein-
forcement ring. Replace seat module with new component
by placing into body seat bore. Tightening cover will engage
seat properly.
7. Insert disc holder assembly back into seat module.
8. Replace spring insuring that it seats properly on disc holder.
9. Place cover onto spring with internal guide on cover posi-
tioned inside end coil.
10. Screw cover onto valve body.
11. Tighten cover wrench tight.
10. Open shutoff valves.
Seat
O-ring
Disc Screw
Reinforcement
Ring
Seat
Disc Washer
Disc Rubber
Disc Holder
Cover
Cover
O-Ring
Spring
Body
3
For repair kits and parts, refer to our Backflow
Prevention Products Repair Kits & Service Parts
price list PL-RP-BPD found on www.watts.com.