Hybrid valving system for varying fluid flow rate

Details Hybrid valving system for varying fluid flow rate Hybrid valving system for varying fluid flow rate

G - Physics

05

D

G05D 7/06 (2006.01) F15C 7/00 (2006.01)

Patent

CA 2126496

In a fluid valuing system, binary fluid control lines are connected in parallel between a common fluid inlet and a common fluid outlet. Each line has a binary valve and a metering orifice for passing a predetermined rate of fluid flow. The rates are in a geometric progression in factors of two. An analog fluid control line is connected in parallel with the binary lines, and has a continuously adjustable flow rate regulator for passing any selected rate of fluid flow up to a maximum at least equal to the largest increment of rate change in the binary lines. The regulator is formed of a miniature solid state device. A controller sets each binary valve open or closed, and sets the regulator for a selected flow rate, such that cooperative settings provide for a smoothly variable rate of total fluid flow.

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