(under subclass 479) Apparatus in which a biased valve having at least a flat center area is mounted in the fluid flow path and moves about a pivot located between its edges, said valve having a dynamic unbalance to fluid flow causing a torque which proportionally governs the position of the valve.
(1) Note. This subject matter comprises some modification of or addition to the conventional butterfly valve mounted at its center, designed to control or extend its quality of unbalance throughout its range of movement.
SEE OR SEARCH THIS CLASS, SUBCLASS:
482, for similar valves with means for compensating for atmospheric pressure differential.
