It is a parallel connection system and this system USES the high-speed valve as a pilot valve to control the twin throttle which controls the pressure and the flux of the hydraulic control system.
It is certainly worse by the pressure reducing valve , hydraulicthrottle valve and the short form of three parts.
它由定差减压阀，液动换向阀和简式节流阀三部分组成。
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The article analyses two throttle speed regulation hydraulic system and presents the control method to in line throttle speed regulation hydraulic system.