Ventilation device with elastomer membrane 2

摘要

The machine (1) has a cover joined with a hollow cylindrical shaped upper part (3) by welding, pressing and/or adhering. A hollow cylindrical shaped lower part is screwed with the upper part by attachment of an injection molded membrane-sealing cylinder. A ball valve includes a spring and a ball, where the spring and the ball are axially moved. The semi-permeable membrane includes a gas penetration body (45) and cylindrical shape attachment of the upper part, where the gas penetration body is provided with support ribs (42) and a pin (40).