Apparatus for controlling the quantity of flow in a fluid medium

Claim 1

A fluid regulator device comprising: a. a housing having an inlet and an outlet, and a fluid flow area therebetween through which a fluid medium may flow from the inlet to the outlet; b. first passage means connecting with said inlet and the fluid medium therein at the prevailing pressure; c. second passage means connecting with said inlet; d. a resilient tubular member whose inner surface defines an internal space comprising said flow area and whose opposite ends are sealingly secured in said housing adjacent said inlet and said outlet, respectively, e. said tubular member having the outer surface thereof in communication with said first passage means and subject to the prevailing pressure therein, and the inner surface thereof in communication with said second passage means for subjecting said inner surface to the fluid medium at a reduced pressure and establishing a pressure differential across the inner and outer surfaces of said tubular member and effecting consequent distortion thereof into said flow area for controlling flow of fluid medium therethrough accordingly.