Patent ID: 9316065
Filing Date: 2016-04-19
CPC Classification: E21B,F15B,F15C,F15D,Y10T

Claim Text:
1. A variable flow resistance device defining at least one flow path comprising: an inlet and an outlet; a jet chamber; a nozzle to direct fluid from the inlet into the jet chamber; first and second input channels diverging from the jet chamber; at least one vortex chamber continuous with the outlet and having first and second inlet openings; wherein the first input channel and the first inlet opening in the at least one vortex chamber are configured to direct fluid flow into the vortex chamber along a tangential path to generate a primary vortex; wherein the second input channel and the second inlet opening of the at least one vortex chamber are configured to direct fluid flow along a radial path into the vortex chamber to produce a secondary vortex that is opposite in direction and weaker in strength relative to the primary vortex; a feedback-operated switch to direct fluid from the inlet alternately to the first and second input channels; and a feedback control circuit configured to receive fluid alternately from primary and secondary vortices in the vortex chamber and in response thereto to operate the switch.