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。
2
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.
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).