Quick-charge and-discharge dispensing system for liquid...

B - Operations – Transporting – 67 – D

Patent

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Details

B67D 3/00 (2006.01) B67D 7/28 (2010.01) B67D 7/36 (2010.01) G01F 11/28 (2006.01)

Patent

CA 2205212

The present invention is directed to a method for dispensing a desired amount of liquid ("unit dose") from a stationary dispenser in a system. The method comprises: (a) opening a liquid outlet valve means to commence dispensing the unit dose; (b) opening an air inlet valve means to flow pressurizing air into the dispenser to maintain a superatmospheric pressure up to about 790 kPa; (c) receiving a first signal in a controller means, the first signal being proportional to the sensed weight of a plunger when a pre-zero reference point is sensed after a major portion of the unit dose is dispensed; (d) transmitting a first output signal from the controller means to at least one gas inlet valve means and the liquid outlet valve means to interrupt momentum of the liquid in the dispenser; (e) restoring a portion of the momentum; (f) receiving a second signal in the controller means, the second signal corresponding to the sensed weight of the plunger when a zero reference point is sensed; and thereafter (g) transmitting a second output signal to close the outlet valve means in less than one second; whereby the unit dose ~ 5 per cent is adapted to be dispensed within a predetermined portion of time, without measuring the level or the volume of liquid contained in the dispenser, or directly weighing the liquid dispensed therefrom. The method and system are particularly useful for the addition of admixtures to concrete.

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