SANDPIPER EB1-M - Manual (Page 3)

520-031-000 8/00 Model EB1-M Page 3
AIR EXHAUST
If a diaphragm fails, the pumped liquid or fumes can enter the air end of the pump,
and be exhausted into the atmosphere. When pumping hazardous or toxic materials,
pipe the exhaust to an appropriate area for safe disposition.
This pump can be submerged if materials of construction are compatible with the
liquid. The air exhaust must be piped above the liquid level. Piping used for the air
exhaust must not be smaller than 1" (2.54 cm). Reducing the pipe size will restrict air
flow and reduce pump performance .When the product source is at a higher level than
the pump (flooded suction), pipe the exhaust higher than the product source to prevent
siphoning spills.
Freezing or icing of the air exhaust can occur under certain temperature and
humidity conditions. Use of an air dryer unit should eliminate most icing problems.
Check exhaust regularly for build-up of ice or contaminants.
PILOT VALVE
The pilot valve assembly is accessed by removing the main air distribution valve
body from the pump and lifting the pilot valve body out of the intermediate housing.
Most problems with the pilot valve can be corrected by replacing the o-rings.
Always grease the spool prior to inserting it into the sleeve. If the sleeve is removed
from the body, reinsertion must be at the chamfered side. Grease the o-rings to slide
the sleeve into the valve body. Securely insert the retaining ring around the sleeve.
When reinserting the pilot valve, push both plungers (located inside the intermediate
bracket) out of the path of the pilot valve spool ends to avoid damage.
PILOT VALVE ACTUATOR
Bushings for the pilot valve actuators are held into inner chambers with retaining
rings. An o-ring is behind each bushing. If the plunger has any sideways motion check
o-rings and bushing for deterioration or wear. The plunger may be removed for
inspection or replacement. First remove the air distribution valve body and the pilot
valve body from the pump. The plungers can be located by looking into the interme-
diate. It may be necessary to use a fine piece of wire to pull them out. The bushing can
be turned out through the inner chamber by removing the outer chamber assembly.
Replace the bushings if pins have bent.
CHECK VALVE SERVICING
Need for inspection or service is usually indicated by poor priming, unstable
cycling, reduced performance or the pump’s cycling but not pumping.
Remove the six bolts securing the manifold(s). Inspect the surfaces of both check
valve and seat for wear or damage that could prevent proper sealing. If pump is to prime
properly, valves must seat air tight.
DIAPHRAGM SERVICING
Remove the eight nuts securing the outer diaphragm chamber flange and remove
the chamber. Loosen the capscrew securing the diaphragm and plate to the rod by
leaving the diaphragm engaged with the capscrews around the outer flange, prevent-
ing rotation of the rod. DO NOT USE A WRENCH ON THE DIAPHRAGM ROD. FLAWS
ON THE SURFACE MAY DAMAGE BEARINGS AND SEAL.
REASSEMBLY
During reassembly make certain that the rubber bumper is on the rod on each side.
Install the diaphragm with the natural bulge outward as indicated on the diaphragm.
Install the heavier plate on the outside of the diaphragm and make certain that the large
radius side of both plates are toward the diaphragm. Place the sealing washer
between the inner diaphragm plate and the end of the rod. Tighten the capscrew to
approximately 25 ft. lbs. (33.90 Newton meters). Torque while allowing diaphragm to
turn freely with plates. Except for EPDM Rubber, use a lightweight oil between plates
and diaphragm when doing this procedure. Use a wrench on the capscrew of the
opposite side to keep the rod from rotating. If the opposite chamber is assembled, the
rod need not be held.
When reassembling the outer chambers and the manifold, the bolts securing the
manifold flange to the chamber should be snugged prior to tightening the chamber
bolts, to insure that the chamber port flange is square with the manifold flange. Finish
tightening the manifold flange bolts after chamber bolting is secured.
CAUTION
If a diaphragm fails the pumped product
or fumes can enter the air side of the
pump. This side is exhausted through
the exhaust port (muffler).
When the product is a hazardous or
toxic material, the exhaust should be
piped to an appropriate area for safe
disposition. When the product source is
at a higher level than the pump (flooded
suction), the exhaust should be piped to
a higher level than the product to
prevent spills caused by siphoning.
CAUTION
In the event of diaphragm rupture,
pumped material may enter the air end
of the pump, and be discharged into the
atmosphere. If pumping a product which
is hazardous or toxic, the air exhaust
must be piped to an appropriate area for
safe disposal.
CAUTION
Before maintenance or repair, shut off
the compressed air line, bleed the pres-
sure, and disconnect the air line from
the pump. The discharge line may be
pressurized and must be bled of its
pressure. When used for toxic or ag-
gressive fluids, the pump should
always be flushed clean prior to
disassembly.