VALVE

摘要

A protruding part (1b) is provided so as to protrude around the entire periphery of the internal peripheral surface of a case (1). An annular seal member (18) is mounted on the external peripheral surface of a valve element (16), the seal member (18) is makes contact with a seal face (1c) of the protruding part (1b) when the valve is closed, and a gap between the case (1) and the valve element (16) is filled. When the valve element (16) is operating, the seal member (18), which is capable of moving integrally with the valve element (16), does not rub against the case (1), whereby sliding resistance and abrasion do not occur.