Self-closing valve for supplying a fluid from a volume has cover with guide seat with pressure sensitive membrane and air channel

摘要

A self-closing valve (01) for supplying a fluid from a volume comprises a cover (04) with an opening (18), a guide seat (09) spaced from the cover with a membrane (02) having an opening (03) between them that changes under pressure differentials between closed, distribution and return positions. A space (16) between the cover and membrane is closed except in the distribution position and there is a channel for air back suction such that it is closed in the closed and distribution positions by the membrane touching the plate.