CPC F16K 1/2266 (2013.01) [F16K 1/46 (2013.01); F16K 27/0218 (2013.01)] | 18 Claims |
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.
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