Rotary piston pumps always used as backing pumps of vacuum systems in vacuum induction ovens.
真空感应炉真空机组中的前级泵，历来使用滑阀泵。
We have two vacuum Induction Ovens for 25 Kilogram volume and relevant vacuum casting facilities.
公司有两套25公斤真空感应炉及相配的真空浇注设备。
A special control software has been developed for the vacuum induction system, of which the main functions were given.
开发了真空感应系统专用控制软件，同时介绍了控制系统软件的主要功能。
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