| 摘要 |
The present invention relates generally to a non-return valve (10) comprising a valve body (12) and a valve membrane (14). The valve body (12) is generally tubular and includes an elongate passageway (16) having an inlet and an outlet defined at its opposing ends (18) and (20), respectively. The valve membrane (14) is in the form of a conical-shaped diaphragm formed integral with the tubular valve body (12). The diaphragm (14) is configured as a generally conical-shaped element having a collapsible opening or aperture (22) located at or adjacent its apex. The conical diaphragm (14) is oriented with its apex in a downstream flow direction. The resiliently flexible material from which the diaphragm (14) is constructed ensures that the diaphragm (14) in a collapsed condition obstructs or closes the aperture (22) to prevent fluid flowing in a reverse direction towards the inlet (18). Pressurization of fluid within the passageway (16) on the inlet side of the diaphragm (14) deflects the diaphragm (14) to expose the aperture (22) so that fluid can flow through the passageway (16) from the inlet (18) to the outlet (20) only.
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