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WIL-10070-E-03

Wilden

Suggested Installation, Operation, Maintenance and Troubleshooting

Operating Principles Behind Accu-Flo™ Pumps

When the solenoid is unpowered, one air chamber is pressurized
with air, while the opposite chamber is exhausted. When electric
power is applied, the solenoid shifts, and the pressurized 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 operation with either
12V DC or 24V AC at 60 Hz and the third coil option allows for 110V

AC operation.

ELECTRICAL CONNECTIONS

Plumbing Connections

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 pressure

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 (continuous operation at high speeds), it may be necessary to relubricate 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.

NOTE: In the event of a power failure, the shutoff valve should be closed, if the restarting of the pump is not desirable once power

is regained.

NOTE: Wilden 6 mm (1/4”) metal pumps come standard side ported with 2 NPT or BSP pipe plugs for side inlet and discharge

porting. Center, top and bottom inlet and discharge porting are optional. Simply drill flat areas provided with a 7/16” drill
bit for NPT or 11 mm drill bit for BSP and tap with NPT or BSP tap as appropriate.

NOTE: Wilden offers drum pump kits for the Metal P.025/A.025 pump (bung base and pick-up tube) for convenient drum pumping

(P/N 50-9290-20/23/55).

NOTE: This pump can be mounted from the underside of a

flat surface providing you more flexibility in tight

areas/ systems.

CAUTION: Pump performance will be seriously hampered

if pump is installed upside down