Ames Fire & Waterworks 400B Bronze Reduced Pressure Zone Assemblies - Manual (Page 5)

5
Maintenance Instructions
WARNING !
Depressurize valve before servicing.
No special tools are required to service the Series 400B 1 ⁄
4
" – 2"
(8 – 50mm).
Before servicing, make sure the 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 it off.
3. Remove the spring.
4. Lift out the disc holder assembly from the body of the valve.
5. To reverse the seat disc, unscrew the disc screw and disas-
semble the disc washer and disc rubber from the disc holder
assembly. Reverse the disc rubber so the opposite face is
showing.
6. Assemble the disc screw through the disc washer and
disc rubber and screw it into the disc holder.
7. To replace the seat module, pull the seat module
out of the body by gripping at the reinforcement
ring. Replace the seat module with the new seat
by placing it into the body seat bore.
NOTICE
When you tighten the cover in Step 12, the cover will engage the
seat module properly.
8. Insert the disc holder assembly back into the seat module.
9. Replace the spring - ensuring that it seats properly on the
disc holder.
WARNING !
The first check valve has a heavy weight spring. The second
check valve has a lighter weight spring. When reassembling the
check valves, make sure you install the correct spring into the
correct check valve.
10. Place the cover onto the spring with the internal guide on the
cover positioned inside the end coil.
11. Screw the cover onto the valve body.
12. Tighten the cover using the appropriate sized wrench.
13. Service the second check valve using Steps 2 through 12.
14. Slowly open shutoff valves.
check Disc washer
check Disc Screw
check Seat
check Seat
O-ring
cover
cover O-ring
check Spring
check Disc Rubber
check Disc Holder
check Assembly
For repair kits and parts, refer to our Backflow Pre-
vention Products Repair Kits & Service Parts price list
PL-A-RP-BPD found on
www.amesfirewater.com.