US 11,732,807 B2
Eccentric butterfly valve
Yukihiro Miyashita, Chino (JP); Kazuhisa Kubota, Chino (JP); and Yuri Kobayashi, Chino (JP)
Assigned to KITZ CORPORATION, Chiba (JP)
Appl. No. 17/773,937
Filed by KITZ CORPORATION, Chiba (JP)
PCT Filed Oct. 29, 2020, PCT No. PCT/JP2020/040587
§ 371(c)(1), (2) Date May 3, 2022,
PCT Pub. No. WO2021/095542, PCT Pub. Date May 20, 2021.
Claims priority of application No. 2019-206717 (JP), filed on Nov. 15, 2019.
Prior Publication US 2022/0364649 A1, Nov. 17, 2022
Int. Cl. F16K 1/226 (2006.01); F16K 1/46 (2006.01); F16K 27/02 (2006.01)
CPC F16K 1/2266 (2013.01) [F16K 1/46 (2013.01); F16K 27/0218 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An eccentric butterfly valve in which a disk axially supported so as to be rotatable at an eccentric position via a stem inside a cylindrical body is provided to a seat ring fixed with a seat retainer inside the body so as to be hermetically sealable, wherein a flexible part which is tilted in accordance with displacement of the disk is formed on an inner diameter side of the seat ring; a spring member is mounted between this flexible part and the seat retainer, the spring which mutually springs back thereonto; this spring member is a spring in which, with the disk being displaced to the seat retainer side in a flow-path direction, a load in a spring-back direction increases in accordance with a magnitude of tilt of the flexible part by this displacement of the disk; and, when the flexible part is elastically deformed, the spring member pressurized by this flexible part is elastically deformed in a state in which a contact with the seat retainer is avoided, and is also mounted in a state in which a contact position with the seat ring gradually makes a transition from the inner diameter side to the outer diameter side with an increase in the tilt of the flexible part.