10
WILDEN PUMP & ENGINEERING, LLC
WIL-10070-E-03
SECTION 7B - OPERATING PRINCIPLES
SECTION 7C – ACCU-FLO™
SUGGESTED OPERATION AND
MAINTENANCE INSTRUCTIONS
OPERATION: 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.
The pump will not shift reliably unless the minimum supply
pressure is supplied. 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 appli-
cations.
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
operation with either 12V DC or 24V AC at 60 Hz and the third
coil option allows for 110V AC operation.
ACCU-FLO™ PLUMBING
CONNECTIONS
