Patent ID: 6662823
Filing Date: 2003-12-16
Classification: G05D,Y10T

Abstract:
An automatic flow control valve comprising:a valve body including an entrance port, an exit port and a fluid channel extending between the entrance port and the exit port in a first direction along which fluid flows through the valve body; a chamber formed in said valve body between the entrance port and the exit port, and extending in a second direction substantially transverse to the first direction, said chamber including an upper chamber portion, a lower chamber portion, and a central chamber portion located between the upper chamber portion and the lower chamber portion in the second direction, wherein the upper chamber portion, the lower chamber portion and the central chamber portion fluidly communicate with one another, and the fluid channel extends through the central chamber portion; a fluid transfer hole formed in an upper portion of said valve body for fluidly connecting the entrance port and the upper chamber portion; a diaphragm mounted in the upper chamber portion, said diaphragm having a top surface and a bottom surface, and extending substantially in the first direction; a fluid channel switching shaft extending in the second direction in the upper and central chamber portions, said fluid channel switching shaft including a top flange portion connected to the bottom surface of said diaphragm, wherein said diaphragm and said fluid channel switching shaft are moved in the second direction by fluid pressure passing through said fluid transfer hole for changing the volume of the central chamber portion; a spring mounted around said fluid channel switching shaft between the top flange portion and a lower end of the upper chamber portion; and a flow control mechanism mounted in the lower chamber portion and including a cover screwed onto said valve body, an adjustment screw passing through a central through hole in the cover and extending in the second direction toward the central chamber portion to control an opening degree of the fluid channel, and a cap covering the adjustment screw.