Patent ID: 6328061
Filing Date: 2001-12-11
Classification: F25B,Y10T

Abstract:
A variable flow area refrigerant expansion device for controlling fluid flow having variable fluid pressure, comprising:a valve body having an axially extending aperture therethrough, wherein said aperture includes an inlet end and an outlet end, wherein an inner surface of said outlet end of said aperture is tapered from a first diameter to a second diameter and terminates in a bore, wherein said first diameter is larger than said second diameter;a piston slidably received in said aperture of said valve body, said piston having a flow passageway partially extending therethrough, said flow passageway having an inlet and an outlet end, wherein said outlet end terminates in a cross-bore formed through said piston;wherein said piston includes a tapered portion positioned downstream from said cross-bore, said tapered portion having a first end defined by a first diameter and second end defined by a second diameter, wherein said first diameter of said tapered portion is greater than said second diameter of said tapered portion; anda spring member operatively connected to said piston to resiliently urge said piston in a first predetermined direction.