觀測和控制操作平臺水平度的方法：在每個千斤頂上安裝液壓截流限位閥，同時在千斤頂的支承桿上安設一調平限位器，每40cm移動一次限位器，皆處在同一標記位置，千斤頂出現升差時，爬升快的千斤頂其限位閥先頂住限位檔而封閉油路，使千斤頂不再進油而停止上升。

熱心網友

The method of observation and control of levelness of operating platform: to install one hydraulic pressing cutoff-and-limit valve on the top of every jack, while installing one leveling limit apparatus on bearing pole of every jack; then to change the level of limit apparatuses for all jacks in pace of every 40cm while keeping them in the same height level mark; once differences among levels of jacks, the quicker jack will be prevented to further climbing up because this jack will be firstly stopped by its limit valve’s pre-set limitation level, which will result in close of hydraulic circuit and no further oil to flow in。