17
Instruction Manual
1-1/4” Plunger;Plastic Single Ball Check
Valves:
see Figure 12
1. Unscrew the valve body (445).
2. Remove the cartridge assembly (425): includes
cartridge (ball, seat, ball guide), O-ring, and
washer.
3. Clean the valve housing and mating port in the
liquid end.
4. Press a new clear plastic washer into valve
body.
5. Install new cartridge valve assembly in
orientation shown in
figure 12
.
• Make sure that seat end of cartridge (white)
is always facing down.
• On discharge side, drop cartridge assembly
into threaded port in head. The O-ring should
be stretched around outside of cartridge on
same end as ball seat. Screw valve body into
discharge side of diaphragm head until valve
is hand tight. Do not overtighten.
• On suction side, drop cartridge assembly
into check valve body. The O-ring should
be stretched around outside of cartridge on
opposite end of ball seat. Screw suction valve
housing with cartridge valve into suction side
of head. Do not overtighten.
1-1/4” Plunger; Metallic Double Ball Check
Valves:
see Figure 13
The metallic check valves used on the 1-1/4”
plunger size pumps are precision assembled at
the factory. Do not attempt to disassemble these
cartridges. If they become inoperative, flush them
with solvent, wash them with warm detergent and
blow them out with compressed air to remove any
foreign matter. If this treatment does not eliminate
the trouble, the cartridge assembly should be
replaced.
A. Disassembly
(refer to figure 13)
1. The check valve cartridge assemblies use
an SAE straight thread with an O-ring seal to
facilitate port alignment with the connecting
pipes. To remove the cartridge from the liquid
end, first loosen the lock nut (435) one or two
threads, then unscrew the cartridge (444,
445).
2. Remove and discard the O-ring (441) and split
ring (439).
3. Carefully clean any parts to be reused. If any
chemicals are used in the cleaning process,
ensure that they are compatible with the process
liquid.
SECTION 4 - MAINTENANCE
