Dover WILDEN A1 Series, Инженерия, эксплуатация и обслуживание, Страница: 12 / 28

WILDEN PUMP & ENGINEERING, LLC
10
WIL-10040-E-02
PLUMBING CONNECTIONS
SECTION 7C – ACCU-FLO™
SUGGESTED OPERATION AND
MAINTENANCE INSTRUCTIONS
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 application
is unique, maintenance schedules may be different for every
pump. Frequency of use, line pressure, viscosity and abra-
siveness 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. Person-
nel 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.
SECTION 7B
OPERATING PRINCIPLES BEHIND
ACCU-FLO™ PUMPS
When the solenoid is not powered, 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.
ELECTRICAL CONNECTIONS