| 摘要 |
<p>A flow rate switcher comprises a cylindrical body (2004) situated between a support body (2002) and an operating member (2003); and a flow passage bottom member which is formed of a hard material and is in close contact with and in part closely fixed to the support body side of an interior of the cylindrical body (2004) forming a flow passage for the fluid; the operating member has a second pressurizing portion (2011) for pressurizing the flow passage side outer peripheral portion of the cylindrical body (2004); the flow passage bottom member has a control groove extending in an axial direction of the cylindrical body (2004); and in the vicinity of a boundary between the cylindrical body (2004) and the flow passage bottom member, a section configuration of both side end portions of the flow passage bottom member exhibits a continuous, gentle roundness, and that of a center thereof portion exhibits a concave configuration.</p> |
