Patent ID: 8905940

Claim:
A flow rate control valve that can variably control a flow rate of a fluid to be supplied to a cuff for a blood pressure information measurement device, the flow rate control valve comprising: a casing that is provided with an inlet port through which the fluid flows in from the cuff and an outlet port through which the fluid flows out, the inlet port being connected to the cuff and the outlet port being open to outside; a single diaphragm that partitions a space within the casing into a flow space in which the fluid flows and a working space in which a working medium different from the fluid is present, the diaphragm separating the working medium from the fluid, and the inlet port and the outlet port each being connected to the flow space; and a valve body that is provided on a portion of the diaphragm that opposes the inlet port, wherein the diaphragm is displaced in accordance with a change in an internal pressure of the working space, the valve body is accordingly moved, resulting in a change in a distance between the valve body and the inlet port, and thus the flow rate of the fluid flowing into the flow space through the inlet port is adjusted, so that the flow rate of the fluid flowing out through the outlet port can be variably controlled.