| 摘要 |
There is provided a shut-off valve (100) including: a valve body part (40) having a valve body surface (41a); a valve seat part (50) provided around an inlet (12a), and having a valve seat surface (51) disposed at a position opposite to the valve body surface (41a); and a moving mechanism that is connected to the valve body part (40), and moves the valve body part (40) in a direction of an axis (A) to switch to either a shut-off state or a circulation state, wherein the valve seat part (50) has an endless inner peripheral side projection (52) and an endless outer peripheral side projection (53) that project from the valve seat surface (51) toward the valve body surface (41a) along the axis (A), and the valve body part (40) has a diaphragm (41) forming the valve body surface (41a), and an elastic member (42) disposed on a back surface of the diaphragm (41). |
