Pumps – Condition responsive control of pump drive motor – With condition responsive control of pump fluid valve
Patent
1992-02-12
1993-04-06
Bertsch, Richard A.
Pumps
Condition responsive control of pump drive motor
With condition responsive control of pump fluid valve
417474, 417478, 417479, F04B 4906
Patent
active
051998521
ABSTRACT:
A pumping arrangement including a squeezing device for deforming a length of pliant p.v.c. tubing first in one direction locally to reduce its volume and in another tending to restore its original cross-section and, on either side of squeezing device, inlet and outlet valves which operate by occluding the tubing. The squeezing device and the valves are controlled by a microprocessor control unit such that inlet valve is open and outlet valve shut while the squeezing device is relaxed and thereafter outlet valve is open and inlet valve shut while the squeezing device is operated to deform the tubing, this sequence repeating. Downstream of the output valve is a pressure responsive device providing input to the control unit whereby upon a rise in pressure in the delivery portion of tubing due to a restriction, the squeezing device is disabled and valves are open together to allow excess fluid to pass back towards the fluid source.
REFERENCES:
patent: 3901231 (1975-08-01), Olson
patent: 4479761 (1984-10-01), Bilstad et al.
patent: 4657490 (1987-04-01), Abbott
patent: 5039279 (1991-08-01), Natwick et al.
Bertsch Richard A.
Danby Medical Limited
Scheuermann David W.
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