When a set of Hydraulic Elevators are used, then a hydraulic supply from a directionalcontrolvalve is required.
当使用一套液压提升集时，那么一个提供液压动力的方向控制阀是必需的。
2
An integral electronic board, mounted to the side of the valve, may be utilized to control the 4-way directionalvalve and motor direction (when not using a rotary encoder control).
安装在计量阀侧边的集成电板可用于控制该独特的4通阀门和马达方向（在不使用旋转编码控制器时）。
3
As important directionalcontrolvalve, direction valve is used to control the direction of movement part.