| 摘要 |
A gate valve apparatus comprising an elastic seal member (15) inserted into a pipe, a pressure member (9) for elastically deforming the elastic seal member (15) under pressure, a drive shaft (8) for moving the pressure member (9) along the direction of insertion, a movable member (12) for keeping the elastic seal member (15) in pressure contact with the inner wall surface of the pipe, and a support member (13) for supporting the elastic seal member (15). The elastic seal member (15) is elastically deformed and kept in close contact with the inner wall surface of the pipe thereby to gate the flow path in the pipe. The elastic seal member (15) includes a through hole (15b) which is formed nearer to the forward end portion along the direction of insertion than a guide hole (13b) of the support member (13) and by way of which the forward end portion of the drive shaft (8) can be inserted. With the movement of the pressure member (9) along the direction of insertion, a first inclined portion and a second inclined portion act to bring the elastic seal member (15) into pressure contact with the inner wall surface of the pipe. <IMAGE>
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