Patent ID: 6158711
Filing Date: 2000-12-12
Classification: F16K,F25B,G05D,Y02B

Abstract:
A flow control valve comprising:a base plate;a cover plate coupled on said base plate, said cover plate having an inlet and an outlet;a chamber formed within said cover plate, supported on an upper surface of said base plate;said chamber comprising:(a) a pressure generating space formed at a lower portion of said chamber and filled with heat expansion solution;(b) a passage formed at a mid-portion of said chamber to communicate with said pressure generating space; and(c) an upper space separated from said pressure generating space and communicated with said pressure generating space through said passage, wherein said passage is narrow relative to a size of said pressure generating space and said upper space;a membrane coupled to an upper circumference of said chamber, said membrane forming a coolant space in which coolant is filled, said coolant space being disposed between said cover plate and said chamber;a disc coupled to a lower surface of said chamber, for sealing said pressure generating space; andmeans for heating said heat expansion solution filled in said pressure generating space,whereby heat exchange between higher temperature heat expansion solution and lower temperature coolant is reduced by minimizing contact between the heat expansion solution and the coolant in said coolant space through said membrane.