Patent ID: 6062246
Filing Date: 2000-05-16
Classification: G05D,Y10T

Abstract:
A mass flow controller comprising:a flow path body having therein an inlet flow path which is branched into a sensor flow path and a bypass flow path, an intermediate flow path in fluid communication with downstream ends of said bypass flow path and said sensor flow path, a downstream end of said intermediate flow path being connected to a mass flow control valve, and an outlet flow path for flowing a fluid from said mass flow control valve;a sensor means for detecting a mass flow of said fluid passing through said sensor flow path;a control circuit for controlling said mass flow control valve and said sensor means; anda shut off valve for opening or closing a flow path from said mass flow control valve to said outlet flow path is disposed in said flow path body and is closely spaced to and in axial alignment with said mass flow control valve to provide a short flow path therebetween.