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A butterfly valve device

IP.com Disclosure Number: IPCOM000127403D
Publication Date: 2005-Aug-29
Document File: 2 page(s) / 17K

Publishing Venue

The IP.com Prior Art Database

Abstract

A butterfly valve consists of a substantially circular disk hinged at opposite sides in a circular channel by means of a shaft pivotally mounted in bushings. The disk comprises recesses for receiving end portions of the bushings. With such a mounting of the bushings, they will have an extension cross the gaps such they provide an additional sealing surface between the periphery of the disk and the adjacent wall surface. Thereby, the leakage, via the gaps in the vicinity of the hinged connections of the disk, is substantially eliminated. The butterfly valve is for example used as an EGR valve for regulating the flow of recirculating exhaust gases of internal combustion engines.

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A butterfly valve device

Butterfly valves are, for example, used as EGR valves for regulating the flow of recirculating exhaust gases of internal combustion engines. Butterfly valves consist of a substantially circular disk hinged at opposite sides in a circular channel by means of a shaft pivotally mounted in bushings. Due to the thickness of the disk, it has to be provided with a more or less chamfered periphery surface in the vicinity of its respective hinged connections for allowing turning motions of the disk in the circular channel. In a closed position of the disk, a leakage is provided via the gaps arisen between said chamfered periphery surfaces of the disk and the adjacent circular wall surface of the channel.

According to the invention, the chamfered periphery surfaces of the disk comprise recesses for receiving end portions of the bushings. With such a mounting of the bushings, they will have an extension cross the gaps such they provide an additional sealing surface between the chamfered periphery surfaces of the disk and the adjacent wall surface. Thereby, the leakage, via the gaps in the vicinity of the hinged connections of the disk, is substantially eliminated.

Fig. 1 and 2 show an embodiment of a butterfly valve device according to the invention, for instance to be used as an EGR valve. Fig. 1 shows the butterfly valve device in an open position and Fig. 2 shows a sectional view of the butterfly valve device in a closed position. The butterfly valve device...