| 摘要 |
A valve consisting of a housing (1) provided with a flow-through passage (4), of a closing member (2) having the shape of a rotational body or part of a rotational body and provided with an aperture (6), and turnably disposed in said flow-through passage, and of a sealing member (3) disposed between the closing member and the housing. Between the sealing member (3) and the housing (1) has been arranged an intermediate space (8) in which when the valve is in closed position prevails a pressure urging the sealing member against the closing member (2). From said intermediate space (8) leads a passage (12) to a point close to that portion of the sealing member (3) adjacent to which an aperture communicating with the flow passage is first established when the valve is being opened. |
