Patent ID: 7131456
Filing Date: 2006-11-07
Classification: G05D,Y10T

Abstract:
1. A mass flow controller comprising: a base having a first passage through which a fluid passes, an inlet portion for introducing the fluid into the first passage and an outlet portion for releasing the fluid from the first passage; a mass flow sensor connected to the first passage adjacent to the inlet portion for measuring a mass flow of the fluid passing through the first passage; a first control valve connected to the first passage adjacent to the outlet portion for controlling the mass flow of the fluid passing through the first passage; a valve controller that compares the mass flow measured by the mass flow sensor to a standard flow and for controlling the first control valve to correspond the mass flow of the fluid to the standard flow; and a second control valve connected to the first passage adjacent to the inlet portion for controlling a full scale of the mass flow of the fluid passing through the first passage, wherein the second control valve includes a valve body that controls an opened sectional area of the first passage and a driving unit that traverses the first passage with the valve body, wherein the valve body includes a shape corresponding to a sectional shape of the first passage and a plurality of holes through which the fluid passes.