Maintenance instructions, Replacement parts, Removing and installing check assemblies – Ames Fire & Waterworks 4000B-FP Bronze Reduced Pressure Zone Assemblies with Gear Operated Slow Close Isolation Valves User Manual
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3
Removing and Installing Check Assemblies
1. Remove the retainer from the body. The check valve car-
tridges can now be removed from the valve by hand or with
a screwdriver. The first check cartridge must be removed
before the second check cartridge can be removed.
NOTICE
The seats and springs of the first and second check car-
tridges are not interchangeable. The heavier spring and
smaller diameter seat belong with the first check cartridge.
2. The check seats are attached to the cage with a bayonet
type locking arrangement. Holding the cage in one hand,
push the seat inward and rotate counter-clockwise against
the cage. The seat, spring cage, spring and disc assembly
are now individual components.
3
⁄
4
" cartridges snap apart.
3. The disc assembly may now be cleaned and reassembled
or, depending on its condition, may be discarded and
replaced with a new assembly from the repair kit. O-rings
should be cleaned or replaced as necessary and lightly
greased with the FDA approved grease.
4. Reassemble the check valve cartridges. Check cartridges
are installed in the valve body with the seat facing the valve
inlet. The cartridges must be securely in place before the
retainer can be replaced. On the
3
⁄
4
" size retainer may have
to be tilted slightly into place. Replace relief valve assembly.
Maintenance Instructions
Flow
Retainer
Relief
Valve
Module
Cover O-ring
First Check Assembly
Second Check Assembly
Check Assembly
1
/
2
" –
3
/
4
" (15-20mm)
O-ring Seal
Injection Molded
Acetyl Resin
Stainless Steel
Spring
Silicone Seal
1st Check
Module
Check Assembly
3
/
4
" (20mm) M3
Check Assembly 1" – 2" (25-50mm)
Seat
Seat
O-ring Seal
Disc
Check Cage
Spring
Disc Assembly
Check Cage
Seat O-ring
Spring
Replacement Parts
For repair kits and parts, refer to Backflow Prevention
Products Repair Kits & Service Parts price list
PL-A-RP-BPD found on www.amesfirewater.com.
WARNING
!
Depressurize the valve before servicing