SANDPIPER EB1 1/2-SM - Manual (Page 3)

520-096-000 8/00 Model EB1½ -SM Type 1 Page 3
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 addressed by using a point of use air dryer to supplement a plant’s air drying
equipment. This device will remove excess water from the compressed air supply
and alleviate the icing or freezing problem.
ESADS: Externally Serviceable Air Distribution System
Please refer to the exploded view drawing and parts list in the Service Manual
supplied with your pump. If you need replacement of additional copies, contact your
local Warren Rupp Distributor, or the Warren Rupp factory Literature Department at
the number shown below. To receive the correct manual, you must specify the
MODEL and TYPE information found on the name plate of the pump.
Models with 1" suction/discharge or larger and NON-METAL center sections
The main air valve sleeve and spool set is located in the valve body mounted on
the pump with four hex head capscrews. The valve body assembly is removed from
the pump by removing these four hex head capscrews.
With the valve body assembly off the pump, access to the sleeve and spool set
is made by removing a retaining ring (each end) securing the end cap on the valve
body assembly. With the end caps removed, slide the spool back and forth in the
sleeve. The spool is closely sized to the sleeve and must move freely to allow for
proper pump operation. An accumulation of oil, dirt or other contaminants from the
pump’s air supply, or from a failed diaphragm, may prevent the spool from moving
freely. This can cause the spool to stick in a position that prevents the pump from
operating. If this is the case, the sleeve and spool set should be removed from the
valve body for cleaning and further inspection.
Remove the spool from the sleeve. Using an arbor press or bench vise (with an
improvised mandrel), press the sleeve from the valve body. Take care not to damage
the sleeve. At this point, inspect the o-rings on the sleeve for nicks, tears or
abrasions. Damage of this sort could happen during assembly or servicing . A
sheared or cut o-ring can allow the pump’s compressed air supply to leak or bypass
within the air valve assembly, causing the pump to leak compressed air from the
pump air exhaust or not cycle properly. This is most noticeable at pump dead head
or high discharge pressure conditions. Replace any of these o-rings as required or
set up a routine, preventive maintenance schedule to do so on a regular basis. This
practice should include cleaning the spool and sleeve components with a safety
solvent or equivalent, inspecting for signs of wear or damage, and replacing worn
components.
To re-install the sleeve and spool set, lightly lubricate the o-rings on the sleeve
with an o-ring assembly lubricant or lightweight oil (such as 10 wt. air line lubricant).
Re-install one end cap, and retaining ring on the valve body. Using the arbor press
or bench vise that was used in disassembly, carefully press the sleeve back into the
valve body, without shearing the o-rings. Re-install the spool, opposite end cap and
retaining ring on the valve body. After inspecting and cleaning the gasket surfaces
on the valve body and intermediate, reinstall the valve body on the pump using new
gaskets. Tighten the four hex head capscrews evenly and in an alternating cross
pattern, at 150 in./lbs. (16.94 Newton meters).
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 in the inner chambers with retaining
rings. An o-ring is behind each bushing. If the plunger has any sideways motion,
BEFORE OPERATION
Before pump operation, inspect all
gasketed fasteners for looseness
caused by gasket creep. Retorque loose
fasteners to prevent leakage. Follow
recommended torques stated in this
manual
Pilot valve spool and o-rings.
Bushings and o-rings.
RECOMMENDED WARREN RUPP
ACCESSORIES TO MAXIMIZE
PUMP PERFORMANCE:
• Tranquilizer ® Surge Suppressor.
For nearly pulse-free flow.
• WarrenRupp Filter/Regulator.
For modular installation and
service convenience.
• Warren Rupp Speed Control. For
manual or programmable process
control.Manual adjustment or
4-20mA reception.
For more detailed information on these
accessories, contact your local Warren
Rupp Factory-Authorized Distributor, or
Warren Rupp corporate headquarters.