Patent ID: 8869825

Claim:
A flow rate control device, comprising: a regulator configured to adjust a pressure of a fluid to be supplied; and an open/close valve provided downstream of the regulator, separated from but in fluid communication with the regulator, the open/close valve including: an intake pathway provided within the open/close valve, the intake pathway being configured to receive the fluid from the regulator and flow the fluid therethrough; a plurality of narrowed pathways provided within the open/close valve, the plurality of narrowed pathways being coupled to a downstream side of the intake pathway such that the plurality of narrowed pathways are in parallel with each other; and an open/close section provided within the open/close valve and coupled to a downstream side of the plurality of the narrowed pathways, configured to switch one of the plurality of narrowed pathways between an open state and a closed state by moving between an open position and a closed position, wherein the regulator comprises: a valve body movably seated in a valve seat arranged in a pathway that communicates between a flow intake port and a flow discharge port in the regulator; a first urging section configured to urge the valve body toward the valve seat; and an operation section configured to resist an urging force of the first urging section and to press the valve body to separate from the valve seat, the operation section controlling the pressure of the fluid by adjusting a pressing force thereof applied to the valve body, wherein the valve body includes: a first diaphragm partitioning the pathway from a housing area of the first urging section such that the fluid does not pass therethrough; and a second diaphragm partitioning the pathway from the operation section such that the fluid does not pass therethrough, and wherein the valve body is configured to move in accordance with the pressing force applied to the second diaphragm from the operation section.