STOP VALVE DEVICE FOR PIPING

PROBLEM TO BE SOLVED: To provide a stop valve device for a pipe that can stop a fluid or gas in a pipe while securing airtightness by using a balloon.SOLUTION: A stop valve device 10 includes; a balloon 12 fitted to an axially center part of an air supply pipe 11; first to fourth transport mechanisms 13-13and fifth to eight transport mechanisms 13-13which are fitted on one end side and the other end side of the air supply pipe 11 at intervals of 45° respectively; first and second rectangular plate type side stoppers 14, 14which are fitted between the balloon 12 at the air supply part 11 and the first to fourth transport mechanisms 13-13and fifth to eight transport mechanisms 13-13respectively; and a hose 15 which has one end connected to the air supply pipe 11 and the other end connected to a compressed air supply/discharge device. The first and second side stoppers 14, 14has diagonal length set to be smaller than the inner diameter of the pipe 11.