Patent ID: 6244561
Filing Date: 2001-06-12
Classification: F16K,F25B,Y02B

Abstract:
A modulating expansion valve for controlling refrigerant fluid flow comprising:a globe valve housing including a high pressure inlet port, a low pressure outlet port, a curved dividing wall having an aperture therethrough, said dividing wall being positioned between said inlet port and said outlet port, including an aperture therebetween, and a generally cylindrical annular flange extending in axial alignment with said aperture,a generally cylindrical piston reciprocally mounted in said annular flange including a foraminous skirt extending through said aperture for variably opening and closing same,means for biasing said piston in an upward direction,an enclosure over a top opening of said annular flange defining a chamber with said annular flange and a top or said piston,first passageway means in said housing and said enclosure for allowing fluid flow from said high pressure inlet port into said chamber for moving said piston therein opposite said biasing direction causing said foraminous skirt to vary the fluid flow rate through said aperture,a first solenoid on said enclosure controlling the flow of fluid through said first passageway,second passageway means in said housing and said enclosure for allowing fluid flow from said chamber into said low pressure outlet port for allowing said biasing means to move said piston, and allowing said foraminous skirt to vary the fluid flow rate through said aperture, anda second solenoid on said enclosure controlling the flow of fluid through said second passageway.