13
WILDEN PUMP & ENGINEERING, LLC
WIL-10060-E-03
The pump will not shift reliably unless the minimum supply
pressure is provided. For the A2T the minimum supply pres-
sure for reliable operation is 2.7 bar (40 psig).
The solenoid operated pump is permanently lubricated during
assembly, and requires no additional lubrication under normal
operation. If the unit runs under extreme conditions (continu-
ous operation at high speeds), it may be necessary to relubri-
cate the center block with a
BUNA-N compatible NLGI Grade
2 grease every 50 million cycles. Continuous lubrication with
a compatible oil is not harmful, and will provide longer seal life,
but it may flush all grease out of the unit.
A red button on the side of the air valve is a manual override,
when actuated it will shift the valve as if an electric current had
actuated the solenoid.
RECORDS: When service is required, a record should be made
of all necessary repairs and replacements. Over a period of
time, such records can become a valuable tool for predicting
and preventing future maintenance problems and unscheduled
downtime. In addition, accurate records make it possible to
identify pumps that are poorly suited to their applications.
MAINTENANCE AND INSPECTIONS: Since each applica-
tion is unique, maintenance schedules may be different for
every pump. Frequency of use, line pressure, viscosity and
abrasiveness of process fluid all effect 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. Internal maintenance is not recommended
for Accu-Flo™ solenoid air valves. When worn or damaged,
a new air valve body, coil or terminal connector must be
purchased. Please consult Section 9 for part numbers.
When the solenoid is unpowered, one air chamber is pressur-
ized with air, while the opposite chamber is exhausted. When
electric power is applied, the solenoid shifts, and the pressur-
ized air chamber is exhausted while the opposite chamber is
pressurized. By alternately applying and removing power, the
solenoid-operated pump runs like a standard Wilden pump.
The speed of the pump is controlled electrically. Since each
stroke is controlled by an electrical signal, the pump is ideal
for batching and other electrically controlled dispensing
applications.
Although the speed of the pump is controlled electrically,
the air pressure is important. Air pressure displaces the
fluid, and if the pressure is insufficient to complete the
physical stroke before an electronic impulse signals the
pump to shift, the stroke will not be completed, and the
displacement per stroke will be reduced. This does not
harm the unit in any way, but it may cause inaccuracy when
attempting to batch specific quantities with high precision if
this effect is not taken into account.
There are three coil voltage options available. One coil allows
for 24V DC operation. The second coil option allows for opera-
tion with either 12V DC or 24V AC at 60 Hz and the third coil
option allows for 110V AC operation.
O P E R A T I N G P R I N C I P L E B E H I N D A C C U - F L O ™ P U M P S
S U G G E S T E D O P E R A T I O N & M A I N T E N A N C E
P L U M B I N G C O N N E C T I O N S
E L E C T R I C A L C O N N E C T I O N S
