The harmonic screw type valve is driven by the double wave harmonic screw. It can transform circle movement to line movement for the closing and opening of the valve.
谐波螺旋式阀门采用双波谐波螺旋传动，实现由圆周运动向直线运动的转化，实现阀门的启闭。
Said diameter plate composed of two pieces is installed in the slot on inner side of compasses' disk. The slide valve and turning handle are on the diameter plate for drawing circle precisely.
圆规盘内侧壁设计了直径片转动槽，直径片分两片组装进入转动槽，直径片上设计有滑动阀与转动柄，从而达到精确划圆的目的。
The hydraulic valve auxiliary control unit (12) can be connected and cut off by means of an additional auxiliary oil circle (3) related to a main oil circle (2) of the internal combustion engine (1).
液压气门辅助控制单元（12）可借助于一相对于内燃机（1）的主油回路（2）附加设置的辅助油回路（3）接通和切断。
There being an incorrect cognition on choice of control valve flow direction in the engineering circle, an elaborate explain pointing to this problem is presented.
工程上对调节阀流向的选择存在误区，文章就此作了详尽的解释。
There being an incorrect cognition on choice of control valve flow direction in the engineering circle, an elaborate explain pointing to this problem is presented.
工程上对调节阀流向的选择存在误区，文章就此作了详尽的解释。
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