The assumed low-stand plunger type hydraulic pumping unit will be provided with a reverse valve having the function of automatic reverse, that translate into simplification of beth the oil circuit and the control system.

• 设想的低架柱塞式液压抽油机中的自动换向阀具有自动换向功能,由此所构思的油路组成及控制两大系统大为简化。