Patent ID: 7131451
Filing Date: 2006-11-07
Classification: G01F,G05D,Y10T

Abstract:
1. A device for controlling fluid flow, of the type having a variable orifice and configured to use a pressure signal, comprising: a fluid flow conduit having a circular cross section; an orifice defined along a length of the conduit, the orifice having at least one planar wall extending in a longitudinal direction of the conduit and defining a maximum cross sectional area that is less than half a cross-sectional area of the conduit; and an element having a linear edge configured to mate with the at least one planar wall of the orifice to form a seal therewith, the element being movable in a direction transverse to the longitudinal direction between an open position wherein fluid flows through the orifice and a closed position wherein the element substantially shuts off fluid flow through the orifice.