Patent ID: 6375085
Filing Date: 2002-04-23
Classification: F25B

Abstract:
A method of suppressing noise in a refrigerant expansion device of the type having a high pressure inlet, a cross passages and a flow path therethrough to a reduced pressure outlet, comprising:(e) disposing an electrically operated shut-off valve in the flow path downstream from the high pressure inlet and the cross passage; (f) disposing a thermally responsive flow control valve having a valve seat and valve member moveable with respect to the valve seat in the flow path intermediate said shut off valve and said reduced pressure outlet; (g) forming a first restricting orifice in the flow path upstream of said shut-off valve seat and intermediate said high pressure inlet and said cross passage for throttling flow between said high pressure inlet and cross passage; (h) forming a second restricting orifice around the same size as said first orifice in the flow path adjacent said shut-off valve seat on the upstream side thereof and downstream of said first orifice.