All-Flo SN-20-P30 2 316 Stainless Steel - Manual

the side where the diaphragm has been inverted. Next reach under the opposite
diaphragm assembly and pull diaphragm rod to opposite side (a large flat screw-
driver may be used as an aid in this process) and assemble remaining outer cham-
ber, reinforcement brackets and cap screws. When positioning outer diaphragm
chambers onto intermediate make sure that witness lines are matching.
NOTE: If air valve has been removed, proper orientation of air system with fluid
chambers must be observed. The top of the intermediate has a single vertical air
passage slot on the air valve mounting face while the outer chamber check ball
cavity should be pointing downward.
PLASTIC PUMPS NOTE: When positioning band clamps use soapy water or a
compatible lubricating spray on the inside of band clamps to aid assembly. Tap
with a mallet on the outside of clamp to help position the clamp while tightening
the fasteners. The band clamp fasteners and cap screws are stainless steel. To
prevent galling always apply an anti-seize compound to the thread. Tighten all
external fasteners to final torque requirement after pump is completely assembled.
8. Position the reassembled manifolds making sure of the proper orientation in rela-
tion to the air valve for your application. Also make sure that the valve seat o-rings
do not shift from their grooves during reassembly. Flat washers should be placed
under the head of each cap screw and nut. Tighten all external fasteners to final
torque requirement after pump is completely assembled.
8A.METAL PUMPS: Position manifold/elbow sections making sure that the valve
seat o-rings do not shift from their grooves. Tighten fasteners on bolts loosely.
EXTERNAL FASTENER TORQUE REQUIREMENTS
NOTE: When reassembling loosely tighten all external fasteners adjusting
and aligning and gradually, in an alternating fashion, tighten to torque
requirements listed below.
CHAMBER BOLTS (Outer Chamber – all versions), 15 ft-lbs (20,34 NM)
BAND CLAMPS (Manifolds and Elbow), 80 in-lbs (9,04 NM)
METAL PUMPS (Elbow to Chamber Bolts), 37 ft-lbs (50,17 NM)
AIR VALVE CAP SCREWS, 40 in-lbs (4,52 NM)
AIR VALVE MAINTENANCE
9. To evaluate air valve components, remove the six cap screws (11), washers, (8, 10) and
nuts from the air valve body (7). The valve plate (5) and shuttle (6) may be inspected by
removing them from their location in the slot in the back of the air valve. Inspect for
scratches or surface irregularities. Replace if necessary. To remove the plug (1) at the
bottom of the air valve, point the bottom of the air valve safely away from people, direct
compressed air through one of the lower holes in the back of the air valve body and the
plug will shoot out. Next push the air valve spool (2) out of the air valve body. Gently reach
in and pull lip seals (43) out of inside bore of the air valve body. Check for cracks, splitting
or scratches. Clean components if replacement is not necessary. Inspect plug o-ring (44)
for any damage and replace if necessary and reinsert in o-ring groove.
NOTE: Make sure that the open side of the two lip seals face each other
when reassembling air valve. Lube all components with suggested mainte-
nance grease as an aid in reassembly.
10. Reinsert air valve spool inside of air valve body. Place shuttle on middle rib of air
valve spool through the square slot in back of air valve. If using original valve plate
lubricate side of plate that was facing the shuttle (or if new valve plate is used
lubricate the lapped and polished side of plate) and place the lubricated side next
to the shuttle in the slot. Press valve plug into air valve body, chamfered end first.
11. Check that gasket (4) is not cracked and If damaged, replace.
12. After gasket is pressed back into position, align air valve onto intermediate and
reinsert the six cap screws with lock washer and flat washers. Apply 40 in-lbs
(4,52 NM) of torque to fasteners.
U.S. Patent Number 5232352
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MAINTENANCE MANUAL
CHECK VALVE AND O-RING MAINTENANCE
1. Flush and neutralize the pump to be certain all corrosives or hazardous materials
are removed prior to any maintenance. This procedure should always be
followed when returning pumps for factory service also.
2. PLASTIC PUMPS: Remove the elbow to outer pumping chamber band clamps
(35). Suction check valve seats (26) and check balls (27) are located inside of the
bottom of the outer chamber (28). Gently remove and inspect for excessive wear,
pitting or other signs of degradation. Inspect valve seat o-rings (24) and replace if
necessary. Discharge check valves are located inside of the bottom of the
discharge elbows (32). Repeat procedure for inspection of discharge check valves.
2A.METAL PUMPS: To inspect the check valves, remove the cap screws (19) from
manifold sections (21, 23). Repeat procedure above. There are no manifold
o-rings in the metallic pumps.
3. To inspect the manifold o-rings remove the manifold band clamps from each mani-
fold assembly. Inspect and replace o-rings if necessary. Then reassemble, lightly
tighten fasteners. The check ball should fit into the curved portion of the valve seat
facing upward when reinserted into the valve seat location. Tighten all external
fasteners to final torque requirement after pump is completely assembled.
NOTE: When using pumps built with PTFE o-rings always replace with new
PTFE o-rings, since the original o-rings will not reseal the pump.
DIAPHRAGM AND PILOT SLEEVE ASSEMBLY MAINTENANCE
4. To inspect diaphragms remove cap screws (16) and reinforcement bracket (25)
from the outer pumping chambers. If replacement is necessary due to abrasion
or rupture unscrew the outer diaphragm plates (29). Models that are built with
PTFE elastomers will have a PTFE overlay (30) that faces the outer pumping
chamber (28) and a back-up diaphragm (31) on the air side of pump. Pumps
without PTFE will contain only the back-up diaphragms.
5. If there has been a diaphragm rupture and corrosive or viscous fluid has entered
the air side of pump the complete air system should be inspected. After removing
diaphragms, inner diaphragm plate (33), and flat washer (47) the pilot sleeve
assembly (13, 14, 15, 42, 45, 48) and diaphragm rod assembly (34, 49) may be
removed by removing the retaining plates (46) (you may only need to remove one
retaining plate) and pushing the entire unit out through the bore in the intermedi-
ate (41). Diaphragm rod assembly must be unscrewed to remove pilot sleeve.
NOTE: To aid in reassembly use a non-synthetic, petroleum based lubricating
grease without EP additives. Carleton-Stuart MagnaLube G is recommended.
6. Clean or replace any components that have excessive wear, dirt build-up, or chemi-
cal attack. Lube all components prior to reassembling. Reassemble pilot sleeve
spacers, o-rings and lip seals (14) within bore of intermediate. Make sure that the
open side of the lip seals is facing outward toward the diaphragms. Also make
sure that the end pilot spacers (45) are at the end on either side of the pilot sleeve
assembly and all inner spacers (48) are separated by o-rings. Next carefully
insert the diaphragm rod assembly with pilot sleeve assembly inside the bore.
Reattach retaining plates. Do not over tighten self-tapping screws (38).
7. With the curved side of the inner diaphragm plate facing the diaphragm, assemble
onto outer diaphragm plate stud and then screw assembly into diaphragm rod.
Push diaphragm rod to opposite side of intermediate and add the opposite dia-
phragm assembly. Tighten the outer diaphragm plates to 372 in-lbs (42,04 NM)
of torque. Assemble the outer chamber, reinforcement brackets and bolts first on