Patent ID: 7819384

Claim:
A gate valve device having a case member which can be attached to a pipe and a gate valve body disposed in the case member and capable of being inserted in the pipe from a hole formed in a peripheral face of the pipe, wherein the gate valve body comprises a valve body core fitting, an elastic seal member covering the valve body core fitting, a press member which presses the elastic seal member from the insertion direction to be elastically deformed, when the elastic seal member is inserted in the pipe, a drive shaft formed in a rod shape along the insertion direction to move the press member along the insertion direction, and a movable member fitted in the middle in the vertical direction of the valve body core fitting and pressing, from the inside, the elastic seal member against an inner wall face of the pipe in a cross direction crossing the insertion direction, the movable member is comprised of an arm having a second inclined section receiving a pressing action from a first inclined section for converting a pressing direction, formed in the press member and pressing the elastic seal member against the inner wall face of the pipe, and a contact section which comes into contact with the inside of the elastic seal member to press the inside, and a recess having the elastic seal member on its inner side is formed in the contact section in the movable member.