BUTTERFLY VALVE

WIPO Patent Application WO/2022/025169

A1

A butterfly valve provided with: a valve body in which an internal flow passage is formed; a seat ring attached to an inner peripheral surface of the internal flow passage; a valve shaft supported by the valve body so as to be able to rotate around an axis of rotation; and a valve element (19) supported on the valve body via the valve shaft so as to be able to rotate. The valve element (19) has an annular outer circumferential surface (45), and two valve shaft openings for enabling insertion of the valve shaft are formed at opposing positions in the rotation axis direction on the outer circumferential surface. Two annular opening raised parts (47), which extend along the circumferential edge of the respective valve shaft openings, and a circumferential raised portion (49), which extends so as to connect the two opening raised parts, are provided on the outer circumferential surface of the valve element, and the circumferential raised portion has a circumferential seal surface (49a) extending along the apex portion thereof, and chamfered surfaces (49b) extending obliquely on both sides of the circumferential seal surface.

JP4101997	Biplane valve
WO/2001/009499	THROTTLE DEVICE, COMPRISING A BUTTERFLY VALVE FOR FITTING INTO A FLANGE JOINT

MASUDA KENSUKE (JP)

PCT/JP2021/028059

February 03, 2022

July 29, 2021

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ASAHI YUKIZAI CORP (JP)

F16K1/226; F16K1/22

WO2015147197A1	2015-10-01
WO2021132712A1	2021-07-01

JP2016041967A	2016-03-31
JPS4914821B1	1974-04-10
JP2005233294A	2005-09-02
JP2004183711A	2004-07-02

TAMBA, Masataka et al. (JP)

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