SELF-CLOSING VALVE

摘要

A self-closing valve assembly (34) comprises a valve of the duckbill type having a flexible body (35) made of flexible material, which body has an inner cavity which forms a duct (3) for a substance, which flexible body has a conical part (35b) with tapering wall sections which, near a discharge end of the duct, form a pair of opposite lips (36) with an elongate discharge slit (36a) between them, which lips lie against one another in the closed position of the valve. The valve assembly furthermore comprises an element (60) which is arranged in the inner cavity of the flexible body (35) and produces a closing force, which element acts on the flexible body and produces a force forcing the lips into the closed position. Preferably, the element producing a closing force acts on the flexible body near the two ends of the discharge slit (36a), the element (60) forcing these ends apart, as a result of which the lips (36) are forced into their closed position.