Patent ID: 6964279
Filing Date: 2005-11-15
Classification: G05D,Y10T

Abstract:
1. A pressure-type flow rate control apparatus comprising: a pipe having a supply-side portion and a control-side portion; an orifice provided between the supply-side portion and the control-side portion of the pipe; a fluid flow rate calculation means for calculating a fluid flow rate Qc by wherein K is a proportional constant; and m and n are constants having values of 0.40<m <0.50 and 0.50<n<0.65, respectively; P an upstream pressure sensor provided on the supply-side portion of the pipe and between a control valve and the orifice, wherein the upstream pressure sensor is disposed to detect the pressure upstream P a downstream pressure sensor provided on the control-side portion of the pipe, wherein the downstream pressure sensor is disposed to detect the pressure downstream P