SOUPAPES A CLAPET NOTAMMENT POUR SYSTEMES D'ASPIRATION

摘要

In a system of the type of a central vacuum cleaner system having a plurality of connection boxes for selective connection of suction implements by insertion of a connector in one such box, a normally closed valve disposed within the box. This valve has a valve flap adapted to by swung into opening position within the box by engagement with the connector during insertion thereof. The valve flap has a concave outer surface and at least one shoulder contacting the forward end of the connector at a position spaced from the pivotal point of the flap.