SANDPIPER EB1/2-A - Manual (Page 2)

Model EB½-A Type 2 Page 2 520-069-000 8/00
cycling rate, but does not increase flow rate, cavitation has occurred, and the valve
should be closed slightly.
For the most efficient use of compressed air and the longest diaphragm life, throttle
the air inlet to the lowest cycling rate that does not reduce flow.
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 3/8" (.9525 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. Use exhaust kit 475-107-000 to pipe out exhaust.
Freezing or icing-up of the air exhaust can occur under certain temperature and
humidity conditions. Use of a Warren Rupp Air Dryer unit should eliminate most icing
problems.
BETWEEN USES
When used for materials that tend to settle out or transform to solid form, the pump
should be completely flushed after each use, to prevent damage. Product remaining
in the pump between uses could dry out or settle out. This could cause problems with
valves and diaphragms at re-start. In freezing temperatures, the pump must be
drained between uses in all cases.
DIAPHRAGM SERVICING
Remove the two V-Band clamps securing the outer chambers to the intermediate
housing. Remove the diaphragm assembly (outer plate, diaphragm, inner plate) by
turning the assembly counterclockwise using a
3 / 4 " wrench on the outer plate lugs. If
a socket is used, it must be a six point socket. The interior components consisting of
the shaft seal and pilot valve assembly are now accessible for service.
Procedures for reassembling the diaphragms are the reverse of the above. During
reassembly make certain that the rubber bumper is on the rod on each side. Install
the diaphragm with the natural bulge outward.
Install the outer diaphragm plate on the outside of the diaphragm and make
certain that the large radius side of the inner plate is toward the diaphragm. Tighten
the outer diaphragm plate to approximately 90 in. lbs. (10.16 Newton meters).
Torque while allowing the diaphragm to turn freely with plates. Use a wrench
on the outer diaphragm plate of the opposite side to keep rod from rotating. If the
opposite chamber is assembled, the rod need not be held.
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.
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.
A Note about Air Valve Lubrication
The pump’s pilot and main air valve assemblies are designed to operate WITH-
OUT lubrication. This is the preferred mode of operation. There may be instances of
personal preference, or poor quality air supplies when lubrication of the compressed
air supply is required. The pump air system will operate with properly lubricated
compressed air supplies. Proper lubrication of the compressed air supply would
entail the use of an air line lubricator (available from Warren Rupp) set to deliver one
drop of 10 wt., non-detergent oil for every 20 SCFM of air the pump consumed at its
point of operation. Consult the pump’s published Performance Curve to determine
this.
It is important to remember to inspect the sleeve and spool set routinely. It should
move back and forth freely. This is most important when the air supply is lubricated.
If a lubricator is used, oil accumulation will, over time, collect any debris from the
compressed air. This can prevent the pump from operating properly.
Water in the compressed air supply can create problems such as icing or freezing
of the exhaust air causing the pump to cycle erratically, or stop operating. This can be
Accessing the check valves.
Exhaust cap assembly.(475-107-000)
Sleeve and spool.
CAUTION
When removing capscrews on suction
or discharge valve retainer/cap, make
sure all pressure on suction and
discharge side of pump has been
relieved. Re-lock wire the capscrews
before continuing use.