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1. (WO2017154487) VALVE DEVICE

Pub. No.:    WO/2017/154487    International Application No.:    PCT/JP2017/005459
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Thu Feb 16 00:59:59 CET 2017
IPC: F16K 1/226
F16J 15/18
F02M 26/70
Applicants: TAIHO KOGYO CO., LTD.
Inventors: SAGAYAMA Akira
下山 晃
浜崎 将行
鈴木 祥平
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.