| 摘要 |
Venting device of a metering unit (3) as a component of a circulation system for producing a reaction mixture from at least two liquid plastic components reacting together, the circulation system comprising storage vessels (1) for each component, metering units (3) for metering each component, mixing head (2) for mixing the components and feed and return lines (4, 5) to the mixing head and to the storage vessels, respectively, a vent line (8) being connected to the metering unit (3) on its suction side, which vent line is connected to the return line via a first non-return valve (9), an apparatus (10) operated at intervals and a second non-return valve (11). <IMAGE>
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