Servicing First and Second Check Valves
1. Remove the relief valve assembly by following the preceding
procedure.
2. Remove the retainer from the body bore. The check valve
modules can now be removed from the valve by hand or with
a screwdriver.
NOTICE
The seats and springs of the first and second check modules are
not interchangeable. The heavier spring and smaller diameter
seat belong with the first check module.
3. 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 counterclockwise for 2
1
⁄
2
" to 3"; clockwise
for 1/4" to 2" against the cage. The seat, spring cage, spring, and
disc assembly are now individual components.
4. The disc assembly may now be cleaned and reassembled or,
depending on its condition, 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 silicon grease.
5. Reassemble the check valve modules. Check modules are
installed in the valve body with the seat facing the valve inlet. The
modules must be securely in place before the retainer can be
replaced. Reinstall relief valve assembly as well as flood sensor
and activation module.
NOTICE
No special tools are required to service assembly sizes 2½" to 3".
CHECK ASSEMBLY
3
⁄
4
" M3
O-ring
Seal
Spring
Disc
Seat
Check
Cage
CHECK ASSEMBLY
1
⁄
4
" –
3
⁄
4
"
Injection Molded
Acetal Resin
O-ring Seal
Stainless Steel
Spring
Silicone Seal
1st Check
Module
CHECK ASSEMBLY 1" - 2"
Seat
Seat O-ring
Disc Assembly
Spring
Check Cage
Cover O-ring
Retainer
Second Check Assembly
First Check Assembly
Relief
Valve
Module
CHECK ASSEMBLY 2½" – 3"
Seat
Seat
O-ring
Disc
Assembly
Spring
Retainer
Cage
Seat
Flow Tube
Cover
Cover O-ring
Relief
Valve
Assembly
Body
Retainer
Second Check
Service Parts Kit
First Check
Service Parts Kit
5
