SANDPIPER M1F Non-Metallic - Manual (Page 32)

m1fnmdl3sm-rev0713 Model M1F Non-Metallic Page 30
Modular Check Valve Drawing
MODULAR CHECK VALVE
SERVICING
Before servicing the check valves,
first shut off the suction line and then
the discharge line to the pump. Next,
shut off the compressed air supply,
bleed air pressure from the pump, and
disconnect the air supply line from
the pump. Drain any remaining fluid
from the pump. The pump can now be
removed for service.
To access the modular check valve,
remove the elbows (items 18 and 19
from pump composite repair parts
drawing). Use a 9/16" wrench or socket
to remove the fasteners. Once the
elbows are removed, the modular check
valves can be seen in the cavities of the
outer chamber (items 14).
Next remove the check valve seal
(item 36). Inspect the seal for cuts
or pinched areas. Replace seal as
needed.
Disassemble the component parts of
each modular check valve. Inspect the
check valve retainer (item 31) for cuts,
abrasive wear, or embedded materials.
Replace as needed.
Inspect the check balls (items 2) for
wear, abrasion, or cuts on the spherical
surface. The check valve seats (items
37) should be inspected for cuts,
abrasive wear, or embedded material
on the surfaces of both the external
and internal chamfers. The spherical
surface of the check balls must seat
flush to the surface of the inner chamfer
on the check valve seats for the pump to
operate to peak efficiency. Replace any
worn or damaged parts as necessary.
Remove the remaining check valve
seal (item 36). Inspect the seal for cuts
or pinched areas. Replace seal as
needed.
Re-assemble the modular check
valve. The seat should fit snugly into
the retainer.
Place a check valve seal (item 36)
into the cavity of the outer chamber
(item 14). Make sure the chamfer side
of the seal faces out. Insert the modular
check valve into the outer chamber
with the retainer facing up. Install a
check valve seal (item 36). Make sure
the chamfer side of the seal faces the
chamfer on the check valve seat or
retainer.
The pump can now reassembled,
reconnected and returned to operation.
8
41 39
26
36
18
31
2
37
36
14