JPH0317478U

JPH0317478U -

Info

Publication number: JPH0317478U
Application number: JP7837989U
Authority: JP
Priority date: 1989-07-04
Filing date: 1989-07-04
Publication date: 1991-02-21
Anticipated expiration: 2004-07-04
Also published as: JP2536479Y2

Description

[Brief explanation of drawings]

第１図は本考案のバタフライバルブの一実施例
を示す半截斜視図であり、第２図Ａ乃至Ｄは、第
１図に示したバタフライバルブのシートリングの
ボス部接触面の実施態様を示すボデーに装着した
シートリングの部分斜視図であり、第３図Ａ乃至
Ｄは、夫々第２図Ａ乃至Ｄに示したシートリング
のボス部接触面及びこれに圧接するステム軸のボ
ス部を示す縦断面図である。又第５図は、従来の
バタフライバルブのジスク及びシートリングを示
す部分斜視図であり、第６図及び第７図は、従来
の他のバタフライバルブのシートリングを示す部
分斜視図及びジスクを示す側面図である。１……シートリング、１ａ……突条、２……ボ
ス部接触面、３……ボデー、４……弁軸孔、５…
…ジスク、５ａ……ボス部、５ｂ……端面、５ｃ
……外周縁、６……ステム軸。 FIG. 1 is a half-cut perspective view showing an embodiment of the butterfly valve of the present invention, and FIGS. 2A to 2D show embodiments of the boss contact surface of the seat ring of the butterfly valve shown in FIG. FIG. 3 is a partial perspective view of the seat ring attached to the body, and FIGS. 3A to 3D show the boss contact surface of the seat ring shown in FIGS. 2A to D, respectively, and the boss of the stem shaft that presses against the contact surface of the seat ring. FIG. Further, FIG. 5 is a partial perspective view showing a disk and a seat ring of a conventional butterfly valve, and FIGS. 6 and 7 are a partial perspective view showing a seat ring and a disk of another conventional butterfly valve. FIG. DESCRIPTION OF SYMBOLS 1...Seat ring, 1a...Protrusion, 2...Boss contact surface, 3...Body, 4...Valve shaft hole, 5...
...Disc, 5a...Boss part, 5b...End face, 5c
...Outer periphery, 6...Stem axis.

補正平１．９．２１図面の簡単な説明を次のように補正する。明細書の第１３頁１１行目「ス部を示す縦断面
図である。」とある記載を「ス部を示す縦断面図
、第４図は第１図に示したシートリングの突条及
びこれに圧接するジスクの外周縁を示す縦断面図
である。」と補正する。Amendment September 21, 1999 The brief description of the drawing is amended as follows. On page 13, line 11 of the specification, the statement ``This is a vertical cross-sectional view showing the square section.'' was replaced with ``A vertical cross-sectional view showing the square section. FIG.

Claims

[Claims for Utility Model Registration] (1) An annular seat ring made of an elastic material is attached to the inner circumferential surface of an annular body, and a disc is inserted into the valve stem hole provided at a position diametrically opposed to the body and the seat ring. A butterfly valve is a butterfly valve in which a stem shaft is rotatably mounted at the diameter of a shaped disc, and the stem shaft is rotated to rotate the disc to open and close the valve. An inner circumferential surface of the seat ring excluding the boss contact surface that is in pressure contact with the end surface of the boss of the seat ring, which is formed to form one spherical surface including the end surface of the boss on which the stem shaft is attached. A protrusion protruding radially inward and extending circumferentially and having an approximately half-moon cross section is formed on the boss, and the contact surface of the boss portion is formed in an aspherical shape radially inward from the protrusion. butterfly valve. (2) The butterfly valve according to claim 1, wherein the boss portion contacting surface of the seat ring has a planar inner portion near the valve stem hole and a conical outer portion. (3) The butterfly valve according to claim 1, wherein the boss portion contact surface of the seat ring has a planar shape. (4) The butterfly valve according to claim 1, wherein the boss contact surface of the seat ring has a conical shape continuous from the edge of the valve shaft hole of the seat ring. (5) The butterfly valve according to claim 1, wherein the contact surface of the boss portion of the seat ring has a different conical shape on the inner side and the outer side of the seat ring closer to the valve stem hole.