With the cooperation of microcomputer, the flow can be adjusted and controlled in many sections without limit. It is a soft piston structure electrohydraulic valve with a wide range of applications and excellent constant flow and multi section control functions. Compared with diaphragm electrohydraulic valve, it has excellent linear control, adjustable constant speed response, low pressure drop at high flow rate, small flow rate, stable control of one liter per second, and constant flow function. It can solve the problem of overshoot and eliminate water hammer. And long life. High oil delivery accuracy. It is an advanced actuator that can automatically control the flow and flow rate of the conveying medium.