SANDPIPER EB50M - Manual (Page 4)

Model EB2-M, EB2-MB, MEB2-M, EB50M Type 3 Page 4 520-035-000 2/02
PILOT VALVE ACTUATOR
The bushings for the pilot valve actuators are threaded into the intermediate
bracket from the outside. The plunger may be removed for inspection or replace-
ment from the inside by removing the air distribution valve body and the pilot valve
body from the pump. The plungers should be visible as you look into the intermedi-
ate from the top. Depending on their position, you may find it necessary to use a fine
piece of wire to pull them out.
Under rare circumstances, it may become necessary to replace the o-ring seal.
The bushing can be turned out through the inner chamber by removing the outer
chamber assembly to reach the bushing.
TROUBLE SHOOTING
1. Pump will not cycle
A. Check to make sure the unit has enough pressure to operate and that the air inlet
valve is open.
B. Check the discharge line to insure that the discharge line is neither closed nor
blocked.
C. If the spool in the air distribution valve is not shifting, check the main spool. It must
slide freely.
D. Excessive air leakage in the pump can prevent cycling. This condition will be
evident. Air leakage into the discharge line indicates a ruptured diaphragm. Air
leakage from the exhaust port indicates leakage in the air distribution valve. See
further service instructions.
E. Blockage in the liquid chamber can impede movement of diaphragm.
2. Pump cycles but will not pump
A. Suction side of pump pulling in air. Check the suction line for air leaks and be sure
that the end of the suction line is submerged. Check flange bolting. Check valve
flanges and manifold to chamber flange joints.
B. Make certain the suction line or strainer is not plugged. Restriction at the suction
is indicated by a high vacuum reading when a vacuum gauge is installed in the
suction line.
C. Check valves may not be seating properly. To check, remove the suction line and
cover the suction port with your hand. If the unit does not pull a good suction
(vacuum), the check valves should be inspected for proper seating.
D. Static suction lift may be too high. Priming can be improved by elevating the
suction and discharge lines higher than the check valves and pouring liquid into
the unit through the suction inlet. When priming at high suction lifts or with long
suction lines operate the pump at maximum cycle rate.
3. Low performance
A. Capacity is reduced as the discharge pressure increases, as indicated on the
performance curve. Performance capability varies with available inlet air supply.
Check air pressure at the pump inlet when the pump is operating to make certain
that adequate air supply is maintained.
B. Check vacuum at the pump suction. Capacity is reduced as vacuum increases.
Reduced flow rate due to starved suction will be evident when cycle rate can be
varied without change in capacity. This condition will be more prevalent when
pumping viscous liquids. When pumping thick, heavy materials the suction line
must be kept as large in diameter and as short as possible, to keep suction loss
minimal.
C. Low flow rate and slow cycling rate indicate restricted flow through the discharge
line. Low flow rate and fast cycling rate indicate restriction in the suction line or air
leakage into suction.
D. Unstable cycling indicates improper check valve seating on one chamber. This
condition is confirmed when unstable cycling repeats consistently on alternate
exhausts. Cycling that is not consistently unstable may indicate partial exhaust
restriction due to freezing and thawing of exhaust air. Use of an anti-freeze lubri-
cant in an air line lubricator should solve this problem.
For additional information, see the Warren Rupp Troubleshooting Guide.
WARRANTY
This pump is warranted for a period of five years against defective material and
workmanship. Failure to comply with the recommendations stated in this manual
voids all factory warranty.
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
DANGER
Before doing any maintenance on the
pump, be certain all pressure is
completely vented from the pump,
suction, discharge, piping, and all other
openings and connections. Be certain
the air supply is locked out or made non-
operational, so that it cannot be started
while work is being done on the pump.
Be certain that approved eye protection
and protective clothing are worn all
times in the vicinity of the pump. Failure
to follow these recommendations may
result in serious injury or death.
© 2000 Warren Rupp, Inc. All rights reserved.
®Warren Rupp,SandPIPER, and Tranquilizer are
registered tradenames of Warren Rupp, Inc.
®Neverseize is a registered tradename of Loctite
Printed in U.S.A.
RECOMMENDED
WARREN RUPP
ACCESSORIES
TO MAXIMIZE PUMP
PERFORMANCE:
• Tranquilizer ® Surge
Suppressor. For nearly
pulse-free flow.
• Warren Rupp programmable
Batch Control or Pulse
Output
Interfaces for repeatable
accuracy.
• 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.