... 双串行联结式减速齿轮 dual tandem articulated type reduction gear 双阀 dual valve 双电压直流系统 dual voltage DC system ...
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注意：双阀瓣止回阀能够安装在水平或流向朝上的垂直位置。
NOTE: Twin Disc Check Valves can be installed horizontally or in the vertical position with flow up.
为了安全起见我们要在取样点设双阀以便于安全的压降，取样口还要加护罩。
For safety we should use dual valves to aid safe pressure reduction, and cap the sample outlets.
介绍了一种新型的压力先导控制伺服阀，该阀的功率放大级采用双阀芯结构代替传统单阀芯结构。
A new servovalve using a pressure control pilot state was introduced, which USES two spools instead of single spool in power magnifying stage.
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