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|1. (WO2017154487) VALVE DEVICE|
|Applicants:||TAIHO KOGYO CO., LTD.
Provided is a valve device wherein a seat and a seal ring can be prevented from wearing. Provided is a valve device comprising: a seat 20 having a flow passage 21 formed therein so as to extend therethrough; a valve 30 which is disposed in the flow passage 21 so as to be capable of pivoting and which pivots to open and close the flow passage 21; a seal ring 40 fitted to the outer periphery of the valve 30; and a notch pin 60 which, when the valve 30 pivots to a position where the valve 30 closes the flow passage 21, increases the diameter of the seal ring 40 to seal the gap between the seat 20 and the seal ring 40.