Maintenance instructions – Ames Fire & Waterworks 400B Bronze Reduced Pressure Zone Assemblies User Manual

Page 5

Maintenance Instructions

WARNING

Depressurize valve before servicing.

No special tools are required to service the Series 400B

⁄

" – 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

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.