Hereinafter referred to as proportional valve electro-hydraulic proportional valve.

The ordinary hydraulic valve can only through the way of preset pressure, flow rate of liquid flow fixed value control.

But when equipment requirements in the process of work of hydraulic system pressure, flow parameters to adjust or continuous control, for example.

Hold bench when the job is feed to the slow, fast, slow speed to realize continuous change of feed, or in a certain accuracy simulate a curve of optimal control force control.

The ordinary hydraulic valve are not achieve them. At this moment can electricity fluid proportional valve to control the hydraulic system.