PSG Dover WILDEN PRO-FLO P.025, Engineering, Operation & Maintenance, Page: 12 / 28

WIL-10090-E-08
Wilden
®
12
Suggested Installation, Operation, Maintenance and Troubleshooting
This illustration is a generic
representation of an air-operated
double-diaphragm pump.
NOTE: In the event of a power failure, the shut-off
valve should be closed, if the restarting of the pump is
not desirable once power is regained.
Air-Operated Pumps: To stop the pump from operating in an
emergency situation, simply close the shut-off valve (user-
supplied) installed in the air supply line. A properly functioning
valve will stop the air supply to the pump, therefore stopping
output. This shut-off valve should be located far enough away
from the pumping equipment such that it can be reached safely
in an emergency situation
Operation
The P.025 is permanently lubricated, and does not require in-
line lubrication. Additional lubrication will not damage the pump;
however, if the pump is heavily lubricated by an external source,
the pump’s internal lubrication may be washed away. If the
pump is then moved to a non-lubricated location, it may need to
be disassembled and re-lubricated as described in the
DISASSEMBLY/REASSEMBLY INSTRUCTIONS.
Pump discharge rate can be controlled by limiting the volume and/or
pressure of the air supply to the pump. An air regulator is used to
regulate air pressure. A needle valve is used to regulate volume.
Pump discharge rate can also be controlled by throttling the pump
discharge by partially closing a valve in the discharge line of the pump. This action
increases friction loss which reduces flow rate. (See Section 5.) This is useful when
the need exists to control the pump from a remote location. When the pump
discharge pressure equals or exceeds the air supply pressure, the pump will stop;
no bypass or pressure relief valve is needed, and pump damage will not occur. The
pump has reached a “deadhead” situation and can be restarted by reducing the fluid
discharge pressure or increasing the air inlet pressure. Wilden Pro-Flo
®
pumps run
solely on compressed air and do not generate heat; therefore, your process fluid
temperature will not be affected.
Maintenance and Inspections
Since each application is unique, maintenance schedules may be different for
every pump. Frequency of use, line pressure, viscosity and abrasiveness of
process fluid all affect the parts life of a Wilden pump. Periodic inspections
have been found to offer the best means for preventing unscheduled pump
downtime. Personnel familiar with the pump’s construction and service should
be informed of any abnormalities that are detected during operation.
.