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
The utility model discloses a pneumatic control multi-way directionalvalve applied to a remote pneumatic-controlhydraulic system with the coexistence of large flow rate and small flow rate.