The control mechanism is connected to the evacuation hole of the vacuum cup and is used for controlling the vacuum opening or vacuum closing of the vacuum cup.
控制机构连接至真空吸盘的抽真空孔，用以控制真空吸盘的真空开启或真空关闭。
If the exhaust system is under a vacuum, the casing must be warmed by gradually introducing the steam, after opening the exhaust valve.
如果排气系统处于真空下，必须在打开排气阀后，逐渐引蒸汽来加热壳体。
The main beam of the bridge of Tongling Road of Hefei City adopts the vacuum auxiliary mud jacking technique and has achieved good effects and ensured the quality of opening mud jacking.
合肥市铜陵路桥主梁采用真空辅助压浆技术，取得了很好的效果，确保了孔道压浆的质量。
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