JPH045562U

JPH045562U -

Info

Publication number: JPH045562U
Application number: JP4689890U
Authority: JP
Priority date: 1990-05-07
Filing date: 1990-05-07
Publication date: 1992-01-20

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を示すバタフライ弁
の縦断面図、第２図Ａ及びＢは閉弁時及び開弁時
の要部断面図、第２ａ図ないし第２ｃ図は要部断
面説明図、第３図Ａ及びＢは本考案の異つた実施
例を示す閉弁時及び開弁時の要部断面図である。１……本体、２……弁体、３……シートリング
、３１……非金属製シートリング、３１ａ……環
状溝、３１ｂ……先端山形部、３１ｃ……山形部
、３２……金属製シートリング、３２ａ，３２ｂ
……先端延長部、４……シートリング押え、５…
…ボルト、６……弁棒、７，８……軸受。 Fig. 1 is a vertical sectional view of a butterfly valve showing an embodiment of the present invention, Figs. 2 A and B are sectional views of the main part when the valve is closed and open, and Figs. 2a to 2c are sectional views of the main part. Explanatory drawings and FIGS. 3A and 3B are sectional views of main parts when the valve is closed and when the valve is opened, showing different embodiments of the present invention. 1... Main body, 2... Valve body, 3... Seat ring, 31... Non-metallic seat ring, 31a... Annular groove, 31b... Tip chevron, 31c... Chevron, 32... Metal Seat ring, 32a, 32b
...Tip extension, 4...Seat ring holder, 5...
...Bolt, 6... Valve stem, 7, 8... Bearing.

Claims

[Claims for Utility Model Registration] 1. A system comprising a hollow cylindrical main body made of a rigid material and a valve body rotatably disposed in the internal fluid passage, the central axis of rotation of the valve body being aligned with the outer periphery of the valve body. In the butterfly valve which is eccentric from the seat surface of the main body, a non-metallic seat ring is disposed at a position corresponding to the outer circumferential surface of the valve body when the valve is closed on the inner circumferential surface of the main body, and is joined to the outer circumferential side of the seat ring. A metal seat ring that always acts elastically in the inner diameter direction is attached to the main body, and the metal seat ring ensures that the non-metal seat ring is brought into close contact with the valve body seat surface when the valve is closed. A butterfly valve characterized by: 2. A plurality of independent annular convex portions having a chevron-shaped cross section are provided on the surface of the non-metallic seat ring that comes into contact with the valve body seat surface to improve sealing performance with the valve body seat surface.
The butterfly valve according to claim 1, characterized in that the butterfly valve is held more reliably. 3. The valve according to claim 1 or 2, characterized in that the distal end of the metal seat ring is extended from the distal end of the non-metallic seat ring, and the extended part is in close contact with the valve body seat surface when the valve is closed. Butterfly valve. 4 Claim 1 characterized in that a non-metallic seat ring and a metallic seat ring are adhesively bonded together.
Butterfly valve as described.