Patent ID: 10018277

Abstract:
A flow rate control valve capable of eliminating an extra operation of a diaphragm spacer after a valve has become a closed state and shortening a response time is provided. It has an annular valve seat 115, a diaphragm 116 including a thin plate-shaped elastic body an outer peripheral part of which has been fixed, and a diaphragm spacer 117 located on the opposite side of the valve seat 115 with the diaphragm 116 interposed therebetween, and the annular valve seat 115, the diaphragm 116 and the diaphragm spacer 117 are coaxially disposed. And, it is structured that the annular valve seat 115 has, on its top, an inclined surface 123 inclined to the inner peripheral side, and the diaphragm 116 is displaced in a direction of the valve seat 115 and the inclined surface 123 on the top of the valve seat 115 and the diaphragm 116 abut against with no gap by pressing force of the diaphragm spacer 117.