Check valve, especially for vacuum-operated installations in motor vehicles
First Claim
1. A check valve, comprising a two-partite housing means provided with inlet and outlet channel means and a roller diaphragm means pressed by a prestressed spring against its sealing seat means and secured between the housing parts of the two-partite housing means, characterized in that the roller diaphragm means includes an annularly shaped curved portion which as movable sealing part cooperates with the bottom of the one housing part constructed as sealing seat means in such a manner that a central bore provided in the section of the diaphragm means located on the side of the spring connects the inlet channel means terminating outside of the curved diaphragm portion, with the outlet channel means of the other housing part, when, upon exceeding a predetermined pressure difference, the curved diaphragm portion lifts off from the sealing seat means.
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Accused Products
Abstract
A check valve, especially for vacuum-operated installations in motor vehicles, which includes a two-partite housing and a roller diaphragm secured between the housing parts provided with inlet and outlet channels; the roller diaphragm which is pressed against its sealing seat by a prestressed spring, cooperates by means of its ring-shaped, curved diaphragm portion as movable sealing part with the bottom of one housing part constructed as sealing seat in such a manner that a central bore provided in the section of the roller diaphragm located on the side of the spring, connects the inlet channel terminating outside of the curved diaphragm portion with the outlet channel of the housing part, when the curved diaphragm portion lifts off from the sealing seat upon exceeding a predetermined differential pressure.
13 Citations
10 Claims
- 1. A check valve, comprising a two-partite housing means provided with inlet and outlet channel means and a roller diaphragm means pressed by a prestressed spring against its sealing seat means and secured between the housing parts of the two-partite housing means, characterized in that the roller diaphragm means includes an annularly shaped curved portion which as movable sealing part cooperates with the bottom of the one housing part constructed as sealing seat means in such a manner that a central bore provided in the section of the diaphragm means located on the side of the spring connects the inlet channel means terminating outside of the curved diaphragm portion, with the outlet channel means of the other housing part, when, upon exceeding a predetermined pressure difference, the curved diaphragm portion lifts off from the sealing seat means.
Specification