Patent ID: 7114519

Claim:
A fluid flow actuated valve for controlling the fluid flow in a conduit for bleeding bypass fluid comprising: a support ring adapted to be mounted within the conduit: two flap members pivotally mounted to the support ring, respectively, and being pivotable between a first position in which the two flap members are substantially positioned in a plane normal to a central axis of the support ring for a minimum fluid flow passage and a second position for a maximum fluid flow passage; and spring means including at least one or more springs disposed in a position in which an axial axis of each spring is substantially perpendicular to an axial axis of the support ring, the spring means urging the flap members against a fluid pressure differential smaller than a predetermined level to pivot from the first position to the second position, and permitting the flap members under a fluid pressure differential not smaller than the predetermined level to pivot from the second position to the first position.