Patent ID: 6173737
Filing Date: 2001-01-16
Classification: G05D,Y10T

Abstract:
A control valve for regulating fluid flow in either direction of flow through the valve, comprising:a. a housing having a bore and at least two ports located remote from each other;b. a movable sleeve disposed within said bore of said housing and having a wall forming a first chamber which communicates with one of said at least two ports and a second chamber which communicates with the other one of said at least two ports, the wall having an orifice thereto to permit flow of fluid therethrough;c. means for biasing said movable sleeve within said housing where said sleeve is self-adjustable to an equilibrium position such that said at least two ports are at least partially open, and when fluid flows in either direction of said valve and then through said orifice causing said movable sleeve to move, thereby at least partially obstructing either one of said at least two ports and restricts the fluid flow between said first and second chambers; andd. said biasing means including two spring means respectively disposed within said first and second chambers, each spring means having a different tension strength to provide different fluid flow rates in either direction flow through said control valve;e. whereby the fluid flow rate is restricted in either direction of flow through said control valve.