Patent ID: 6742539
Filing Date: 2004-06-01
Classification: F16K,G05D,Y10T

Abstract:
A precision flow control valve comprisinga housing having a fluid inlet at one fitting end and fluid outlet at another fitting end, a control body supported within the housing by support structure bridging between the control body and the housing, the housing and control body together defining a flow passage communicating with the fluid inlet and outlet for flow of fluid through the valve from the inlet to the outlet in a direction of flow along fluid paths symmetric with respect to an axis of the control body, the control body and support structure being streamlined so as not to interfere substantially with said flow of fluid along the flow paths, the housing and a leading end of the control body extending to a rearward end define a flow passage cross sectional area kAi relating to an effective inlet cross sectional area Ai and wherein k is a constant from about 1.1 to about 1.2, the flow paths are symmetric about at least one axis perpendicular to the direction of fluid flow, at least one valve member having a fitting end facing surface and a control body facing surface carried by the control body in an orientation for being shifted by driven movement along said axis relatively toward and away from the fitting end for control of fluid passing through the fitting end, an actuator within the control body for driving the valve member along said axis, at least one port extending through the support structure for communicating with the actuator and providing for control of the actuator.