SANDPIPER S07 - Manual (Page 26)

s07nmdl1sm-rev0614 Models S07 Non-Metallic Page 24
MODULAR TRIHEDRAL CHECK
VALVE SERVICING
Before servicing the trihedral 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 trihedral
valve, remove the elbows (items
16 from the pump composite repair
parts drawing). Use a 1/2" wrench or
socket to remove the fasteners. Once
the elbows have been removed, the
modular trihedral valves can be seen
in the cavities of the outer chamber
(items 13).
Next remove the o-rings (items 45
and 46). Inspect the o-rings for cuts,
or pinched areas. Replace the o-rings
as needed.
Disassemble the modular trihedral
valves. Insert a finger through the hole
in the bottom of each retainer housing
(item 39) and push the remaining
valve components out the top of the
housing. Inspect the chamfers on the
retainer housing for cuts, abrasive wear
or embedded material. Replace the
bushings as needed.
Remove the sealing bumper
(item 40) from the trihedral valve
sleeves (item 44). Inspect the bumper
seals for cuts, abrasive wear, or
embedded material. Replace the
bumper seals as needed.
The trihedral valves (item 42) and
valve inserts (item 41) can now be
removed. Separate the valve insert
from the elastomeric trihedral valve
and inspect for cuts, abrasive wear, or
embedded material. Replace the inserts
as needed.
Inspect the trihedral valves for cuts,
abrasive wear, or embedded material.
Replace the trihedal valves as needed.
RE-ASSEMBLE THE VALVES
Install the trihedral valve inserts
into the trihedral valves. Push the
assembled trihedral valves into the
valve sleeves until they stop on the
counter bore in the sleeves. Next insert
the bumper seals into the sleeves.
Install the assembled valves,
sleeves and bumper seals into the
retainer housings with the bumper seals
facing the bottom of the housing.
SUCTION END VALVES
Install an o-ring (item 45) into the
groove created between the sleeve and
the housing and insert the assembly
into the counterbore on the suction end
(bottom) of each outer chamber. Align
an o-ring (item 46) with the chamfers on
the retainer housings and counterbores
of each chamber and install the suction
elbows.
DISCHARGE END VALVES
Install an o-ring (item 46) into the
counterbore on the discharge end (top)
of each outer chamber.
Insert the assembled housing,
bottom end down, until the exterior
chamfer touches the installed o-ring.
Install an o-ring (item 45) into the
groove created between the sleeve and
the housing.
Fasten the discharge elbows to the
outer chamber.
The pump can now be reassembled.
reconnected, and returned to operation.
Read these instructions
completely, before
installation and start-up.
It is the responsibility of
the purchaser to retain
this manual for reference. Failure to
comply with the recommendations stated
in this manual will damage the pump, and
void factory warranty.
IMPORTANT