Patent ID: 8800593

Claim:
A flow controller comprising: a body including a first passage disposed on an upstream side through which a fluid flows, a second passage disposed on a downstream side with respect to the first passage, and a throttling section disposed between the first passage and the second passage; a flow rate detector disposed on the body and which includes a detection unit configured to detect flow rate of the fluid that flows from the first passage to the second passage; a flow rate controller for controlling a flow rate of the fluid through the body and which is disposed in parallel with the flow rate detector, the flow rate controller including a diaphragm assembly which is displaced by supply of pilot air, a stem having a first end connected to the diaphragm assembly, a valve body fixed to a second end of the stem which opposes the first end such that the valve body is connected to the diaphragm assembly through the stem, and a spring that urges the valve body in a direction to be seated on a valve seat formed in the body, wherein the detection unit includes a MEMS sensor, the flow rate controller further comprising a balancing structure for balancing a first pressing force applied from the diaphragm assembly to the valve body with a second pressing force applied from the spring to the valve body and which opposes the first pressing force.