The flow control valve is a multi-functional valve that uses high-precision pilot mode to control flow. Under a certain pressure difference, the flow of the throttle is controlled by changing the hydraulic resistance of the throttle, so as to adjust the movement speed of the actuator (hydraulic cylinder or hydraulic motor). It is applicable to the pipeline where the flow and pressure of the distribution pipe need to be controlled. Keep the predetermined flow unchanged, limit the excessive flow to a predetermined value, and appropriately reduce the upstream high pressure. Even if the pressure upstream of the main valve changes, it will not affect the flow downstream of the main valve. According to different purposes, functions and places, it can be developed into remote control float valve, pressure reducing valve, slow closing check valve, flow control valve, etc.