Patent ID: 7637152

Claim:
A flow-rate control system for controlling a minute flow rate of a fluid flowing through a fluid channel having an outlet environment of constant pressure, the flow-rate control system comprising: a flow-rate measurement conduit portion having a predetermined length connected to an outlet-side end of the fluid channel and whose outlet environment is set to constant pressure by setting the cross-sectional area of a channel smaller than the fluid channel; a pressure detection part for detecting the pressure of the fluid at the upstream side of the flow-rate measurement conduit portion by being disposed near an outlet of the fluid channel; a pressure/flow-rate conversion part for calculating a flow rate from a fluid pressure detected at the pressure detection part; a flow-rate control valve that is connectable to the pressure/flow-rate conversion part; and a block-shaped body, one surface of which is provided with the flow-rate control valve and the flow meter, and inside of which is provided the fluid channel connecting the flow-rate control valve and the flow meter; wherein the fluid channel includes a first inclined channel gradually inclined to an area in which the flow meter is provided, the first inclined channel being inclined from an area of the surface where the flow-rate control valve is provided to the inside of the body, and a second inclined channel gradually inclined to an area in which the flow-rate control valve is provided, the second inclined channel being inclined from an area of the surface where the flow meter is provided to the inside of the body, the second inclined channel being connected to an end of the first inclined channel.