Patent ID: 6302191
Filing Date: 2001-10-16
Classification: F28D,F28F,Y10S

Abstract:
A heat exchange unit with an intrinsically safe, internal bypass valve, comprising:a) an outer casing;b) a peripherally and longitudinally extending, heat exchanger array;c) a sleeve valve movable axially relative to the heat exchanger array and forming the bypass valve;d) a valve plug;e) an outer casing valve seat; andf) actuation means for moving the sleeve valve to create a gas seal on the valve plug at one extreme of axial travel in order to cause a hot gas to flow through the heat exchanger array and, at an opposite extreme of travel, to create a gas seal on the outer casing valve seat in order to cause the hot gas to flow through a bypass duct comprising a central passageway of the sleeve valve, thereby bypassing the heat exchanger array.