| 摘要 |
A sealer (10) for vacuum containers comprises a valve unit (12) and a removable vacuum-pump head (14). The valve unit consists of a valve housing (24) which can be connected to a vacuum container to be evacuated, for example through a flange (16), and a cylindrical valve element (42) inserted into the valve housing. The valve element has a top transverse opening (46) for interaction with a driving tool, a middle transverse hole (48) for connection to a source of vacuum through the above-mentioned vacuum pump head when the latter is fitted onto the valve element, a bottom transverse hole (52), and an axial bore (50) which connects the middle transverse hole to the bottom transverse hole. The valve element also has a threaded portion (44) which engages an inner thread (36) formed in the valve housing, so that the valve element can be screwed into the valve housing, and can interact with saddle (40) in the valve housing. When the valve element forms a predetermined gap G with the saddle, the vacuum container is connected to the source of vacuum through the above-mentioned gap, bottom transverse hole, axial opening, middle transverse hole, and vacuum pump head. One can evacuate, seal, transport and deliver the container to an installation site, or perform any other operation with the container in its evacuated and sealed state.
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