Channel closing device and valve closing method using flow path blocking device

摘要

PROBLEM TO BE SOLVED: To provide a flow passage closing device capable of surely closing a flow passage by using an existing branch pipe part having a valve part connected thereto.SOLUTION: A flow passage closing device includes: a cylindrical case 20 that is mounted to a valve part 3 connected to a branch pipe part 2, the branch pipe part integrally formed so as to project from a fluid pipe 1; a cylindrical insertion guide cylinder 22 capable of moving along an axial core Y direction of the branch pipe part 2; a shaft member 30 penetrating from an end part 20b of the case 20 to an end part 22b of the insertion guide cylinder 22; a closing bag 40 fixed to a tip 30B of the shaft member 30; and an operation unit 60 configured to push the shaft member 30. In a case 20 or between the valve part 3 and the case 20, formed is a movement adjustment mechanism 8 configured to regulate the movement of the insertion guide cylinder 22.SELECTED DRAWING: Figure 2