| 摘要 |
A plastic safety valve for containers, especially pallet containers with an internal container of plastic and an external jacket of metal for the transport and storage of liquids, is constructed as an automatic aerating and venting valve and is integrated into a lid or plug for sealing the filling and/or emptying opening or the aerating and/or venting opening of a container. The valve housing, which is constructed as a threaded plug and can be screwed into a corresponding threaded hole in a threaded cover or threaded plug, has a central hub supported by ribs, wherein the hub has a through-hole. The ribs extend outwardly in a star-like manner from the hub toward a ring-shaped shoulder. Air passage holes are formed between the ribs. An elastically constructed valve membrane of an aerating unit for opening and closing the air passage holes between the ribs is pushed from the inside onto the hub up to a shoulder of the hub. The valve membrane, which is constructed as a hat-shaped profile, is installed in the valve housing with the opening of the hat facing the ring-shaped shoulder of the valve housing, wherein, when the aerating unit is in the closed position, a ring-shaped edge of the membrane rests under pretension against the inside surface of the ring-shaped shoulder of the valve housing which forms a valve seat.
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