| 摘要 |
Self-switching, one-way, pneumatic valve for preventing pressure drops in the water drainage pipes of sanitary facilities connected to the sewerage system, or for other uses, of the type which comprises a body (3) with a through-opening (303) which is positioned on the pipe (1) to be closed off and which on the side directed towards this pipe pivotably supports via an upper pivot a shut-off disc (8) which is directed downwards and which normally closes the said through-opening, characterized in that said through-opening (303) is located in an inclined plane in a diagonally sloping arrangement, with the deepest part situated at the bottom, opposite to the less deep part where the said shut-off disc (8) is hinged, which disc, as a result of said arrangement, when at rest reliably remains in the condition for closing off said through-opening, even if the axis of the valve body and/or the hinge of the shut-off member are not perfectly horizontal.
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