Bellows-type dispensing pump

Details Bellows-type dispensing pump Bellows-type dispensing pump

1990-05-18

1991-10-29

Bertsch, Richard A.

Pumps

Motor driven

Electric or magnetic motor

417 18, 417401, 417507, 92 44, F04B 4500, F04B 3908, F01B 1900

Patent

active

050611569

ABSTRACT:
A microprocessor controlled bellows-type pump system for the precise and accurate pumping and dispensing of fluids. The pump comprises a longitudinally contracting bellows which is supported from warping under fluid pressure by a support bushing in contact with the inside folds of the bellows. A stepper motor drives the bellows position via a lead screw. A system of four valves: a dispense valve, shut-off valve, vent valve, and suck-back valve, control fluid routing within a manifold. One or two pressure transducers allow the microprocessor to control valve positions and stepper motor turning for well behaved dispensing operations.

REFERENCES:
patent: 2590275 (1952-03-01), Ryder et al.
patent: 3787882 (1974-01-01), Fillmore et al.
patent: 4483665 (1984-11-01), Hauser
patent: 4715795 (1987-12-01), Habrich et al.
patent: 4950134 (1990-08-01), Bailey

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