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农机液压传动系统在工作过程中,应按着工作机构的任务,能对其运动方向、运动速度及传递力的大小实现控制。对上述工作要求的控制是通过对液压油的流动方向、流量和压力的控制来实现的。能对液压油的流动方向、流动数量和流动压力实现控制的液压元件称为控制阀。控制阀按其作用可分为方向控制阀、流量控制阀和压力控制阀。
Agricultural hydraulic transmission system in the work process, should be based on the task of the agency, to its movement direction, speed and transmission force to achieve the size of the control. Control of the above requirements is achieved by controlling the flow direction, flow and pressure of hydraulic oil. The hydraulic components that control the flow direction of hydraulic oil, the amount of flow, and the flow pressure are called control valves. Control valve according to their role can be divided into direction control valve, flow control valve and pressure control valve.