Liquid Controls Optical Air Eliminator US Patent 7000628 Refined Fuels Applications A8981 & A8981A - Manual (Page 5)

5
Introduction
How the Optical Air Eliminator Works
The figures to the left show a cutaway view of the vent port
through the solenoid valve. This port has been designed
to optimize the venting of air and vapor from the optical
air eliminator.
When the liquid level is below the sensor, the S3 solenoid
valve is open and allows air and vapor to vent through the
solenoid valve as shown in Figure 4. When the liquid level
is at or above the optical sensor, the S3 solenoid valve
closes the vent path as shown in Figure 5.
The diagram in Figure 6 shows the LectroCount register
logic for a preset delivery. In order to function properly, the
optical air eliminator must be used in conjunction with a
solenoid-actuated control valve at the meter outlet, such
as the A2982-11 or A2848-11.
Figure 6: Optical Air Eliminator operating sequence.
Figure 4: Solenoid and Port Open
Figure 5: Solenoid and Port Closed