Title:
VALVE
Document Type and Number:
WIPO Patent Application WO/2019/093363
Kind Code:
A1
Abstract:
The present invention provides a valve that: forms a backseat structure at a height at which fluid is easily and highly precisely prevented from infiltrating from outside a bonnet; and reliably prevents internal pressure increases. According to the present invention, after a sealing packing (5) has been installed in a bonnet (10) of a longneck structure, a stem (3) is installed so as to be capable of moving up and down, and a flow path (13) that is inside a valve box (2) can be opened and closed by a valve body (4) that has been provided to a lower end of the stem (3). The bonnet (10) integrates an upper bonnet (11) and a lower bonnet (12) that are divided at a position that is higher than the position to which a fluid that flows in the valve box (2) rises when a liquid. A backseat structure (42): has a fixed-side seal surface (21) that is formed at a lower end side of the upper bonnet (11) and a mobile-side seal surface (41) that is an outer circumferential surface of the stem (3); and forms a seal as a result of the mobile-side seal surface (41) and the fixed-side seal surface (21) coming into contact when the valve body (4) is open.
Inventors:
MUTO TAISUKE (JP)
KOBAYASHI TETSUYA (JP)
KOBAYASHI TETSUYA (JP)
Application Number:
PCT/JP2018/041309
Publication Date:
May 16, 2019
Filing Date:
November 07, 2018
Export Citation:
Assignee:
KITZ CORP (JP)
International Classes:
F16K27/12; F16K41/08
Foreign References:
| JP2009293794A | 2009-12-17 | |||
| JPH0334527Y2 | 1991-07-22 | |||
| US4294427A | 1981-10-13 | |||
| JPS5317933U | 1978-02-15 | |||
| US4294427A | 1981-10-13 |
Other References:
See also references of EP 3705763A4
Attorney, Agent or Firm:
KOBAYASHI Tetsuo (JP)
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