Title:
INNER CIRCUMFERENTIAL SEAL STRUCTURE, SEAT STRUCTURE, AND VALVE
Document Type and Number:
WIPO Patent Application WO/2022/018878
Kind Code:
A1
Abstract:
[Problem] To provide an inner circumferential seal structure that reduces the operating torque for closing a valve body, a seat structure, and a valve. [Solution] An inner circumferential seal structure 16 is provided to a seat ring 12 of a butterfly valve 10, protrudes from the inner peripheral surface 12i of the seat ring 12, and is in contact with the outer peripheral surface 14s of a valve body 14 to which a fluid pressure is applied. The inner circumferential seal structure 16 is provided with a first seal surface 18 (1) that is capable of stopping the outer peripheral surface 14s of the valve body 14 as a result of making contact therewith, an engagement protrusion 20 that regulates the rotation of the valve body 14, and an engagement seal surface 18 (3) that is capable of stopping the outer peripheral surface 14s as a result of making contact therewith. The first seal surface 18 (1), the engagement seal surface 18 (3), and the engagement protrusion 20 are positioned, in that order, in the direction in which the outer peripheral surface 14s of the valve body 14 moves due to rotation of the valve body. The seal quantity of the engagement seal surface 18 (3) is greater than that of the first seal surface 18 (1).
Inventors:
TOKUYA YASUHIRO (JP)
Application Number:
PCT/JP2020/040312
Publication Date:
January 27, 2022
Filing Date:
October 27, 2020
Export Citation:
Assignee:
OKUMURA ENG CORP (JP)
International Classes:
F16K1/226
Foreign References:
| JPH07151243A | 1995-06-13 | |||
| US20180080566A1 | 2018-03-22 | |||
| JP2003014139A | 2003-01-15 | |||
| JP3045671B2 | 2000-05-29 |
Attorney, Agent or Firm:
KUSUMOTO Takayoshi et al. (JP)
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