公开(公告)号：US11725733B2

公开(公告)日：2023-08-15

申请号：US16982573

申请日：2019-03-19

Applicant: NTN CORPORATION

Inventor： Kohzoh Kakehi ,  Yuuki Yamazoe

IPC: F16J15/16

CPC classification number: F16J15/16

Abstract: To provide a seal ring capable of suppressing wear of a mating housing and preventing protrusion from an annular groove and thereby being superior in low leak performance, which is an original object of the seal ring. A seal ring 1 formed of resin is attached to an annular groove 12 formed on an outer periphery of a butterfly valve 11 having a substantially disc shape so as to seal an annular gap 14 between the butterfly valve 11 and a housing 13 in which the valve is housed. A part of the seal ring 1 is protruded from the annular groove 12, so that the seal ring 1 adheres to the housing 13 to seal the annular gap 14 due to pressure from sealed fluid. A radial direction thickness t of the ring is set in a range of 7-11% of a ring outer diameter in a free state. A ring inner diameter in a state in which the diameter is enlarged due to pressure from the sealed fluid when the valve is opened, is smaller than an outer diameter r of the valve.

公开(公告)号：US10309539B2

公开(公告)日：2019-06-04

申请号：US15516636

申请日：2015-09-30

Applicant: NTN CORPORATION

Inventor： Kohzoh Kakehi ,  Takumi Kondou

IPC: F16J9/14 ,  F16J15/3248 ,  F16J15/18 ,  F16J15/44

Abstract: The present invention provides a seal ring capable of maintaining excellent low torque generation performance for a long term. A seal ring (1) is mounted on an annular groove formed on one member consisting of either a housing having a shaft hole or a rotary shaft inserted into the shaft hole, partly projects from the annular groove and contacts a surface of other member consisting of either the housing or the rotary shaft, and slidably contacts a side wall surface of the annular groove at a non-sealed fluid side thereof, thereby sealing an annular gap between the one member and the other member. An outer diameter side (2a) of the side surface (2) of the ring to be subjected to at least the side wall surface of the annular groove is formed as an inclined surface having an inclined angle in such a way as to decrease a width of the ring from the outer diameter side of the side surface of the ring to an inner diameter side of the side surface thereof. A concave portion (3) which does not contact the side wall surface of the annular groove and communicates with an inner circumferential surface (1b) of the ring is formed on a portion of the inner diameter side (2b) of the side surface of the ring not projecting from the annular groove.