Patent ID: 6305414
Filing Date: 2001-10-23
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 partially extending therethrough, said aperture including an inlet end and at least one flow aperture, wherein a portion of an inner surface of said valve body terminates in said at least one flow aperture;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 metering member having a tapered section and a straight section 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 section is greater than said second diameter of said tapered section; anda spring member operatively connected to said piston to resiliently urge said piston in a first predetermined direction.