Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Fluid pressure responsive
Patent
1994-06-24
1997-06-10
Drodge, Joseph W.
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Fluid pressure responsive
96106, 137567, 210101, 2101982, 417 2, 417 26, 417 442, 422103, B01D 1508, B01D 1712
Patent
active
056372086
ABSTRACT:
A pumping system for continuously delivering fluid at a selected flow rate to a receiving system. The system includes at least a first and a second pumping unit, each of the individual units comprises a syringe and a valve. The syringe comprises a piston and a piston actuator, cylinder, and pressure sensor. The valve comprises a positively-actuated zero switching volume valve and valve actuator. The first and second pumping units are in fluid communication with one another and are capable of independent actuation. The individual valves are arranged to isolate either the first syringe or the second syringe, respectively, from the receiving system while at least one of the syringes remains in fluid communication with the receiving system whereby system pressure can be continuously monitored and the selected system flow rate maintained. A controller receives inputs from the first and second pressure sensors and activates in response to the inputs the first and second syringes individually, and also activates the first and second valves individually such that when fluid communication is established between the isolated syringe and the receiving system substantially no system flow error is produced. The pressure sensor is positioned within each pumping unit, permitting a pumping unit which has been refilled offline to perform compression of its cylinder contents without perturbation of the on-line process, and which further permits discrimination of the point in the compression cycle where compression has been completed and fluid delivery to the system will commence.
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patent: 5253981 (1993-10-01), Yang et al.
patent: 5308583 (1994-05-01), Sanuki
patent: 5360320 (1994-11-01), Jameson et al.
patent: 5393434 (1995-02-01), Hutchins et al.
patent: 5457626 (1995-10-01), Wolze
Drodge Joseph W.
Jones Huw R.
Michaelis Brian L.
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