Patent ID: 6817416
Filing Date: 2004-11-16
Classification: E21B,F16K,Y10T

Abstract:
A flow control device, comprising:a) an outer sleeve having an outer sleeve wall and at least one aperture through the outer sleeve wall; b) an inner sleeve having an inner sleeve wall and at least one aperture through the inner sleeve wall; and c) means for providing relative sliding movement of the sleeves between open positions allowing variable flow of fluid through the apertures of the sleeves and a closed position, so that relative movement of the sleeves produces a variable amount of opening through which the fluid can flow; wherein d) one of the sleeves has a plurality of apertures, and a sum of widths of those apertures at positions along said one of the sleeves increases substantially exponentially in a direction of fluid flow; wherein e) the apertures are arranged so that a change in a coefficient of velocity (CV) of the fluid flowing through the apertures caused by a change in the relative movement of the sleeves is substantially proportional to the change in relative movement.