Patent ID: 6893001

Claim:
A gate valve apparatus comprising: an elastic seal member inserted into a pipe by way of a through hole formed in the peripheral wall of the pipe; a pressure member for elastically deforming, under the pressure imparted along the direction of insertion, the elastic seal member inserted into the pipe; a drive shaft formed as a rod along the direction of insertion to move the pressure member along the direction of insertion; a movable member for keeping the elastic seal member in pressure contact with the inner wall surface of the pipe in the direction crossing the direction of insertion; and a support member for supporting the elastic seal member; wherein the elastic seal member 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 pressure member includes a first inclined portion for changing the direction of pressure and a guide cylinder portion formed at a position nearer to the forward end along the direction of insertion than the first inclined portion, the movable member has a second inclined portion for receiving the pressure from the first inclined portion, and the support member has a guide hole fitted with the guide cylinder portion; wherein the elastic seal member includes a through hole which is formed nearer to the forward end along the direction of insertion than the guide hole and by way of which the forward end portion of the drive shaft can be inserted; and wherein the pressure member moves along the direction of insertion and thereby causes the elastic seal member to come into pressure contact with the inner wall surface of the pipe under the effect of the first inclined portion and the second inclined portion.