摘要：The electro-hydraulic servo rotary valve [1, 2] is a type of direct-acting electro-hydraulic servo valve that drives the valve core to rotate directly or indirectly to achieve the opening and closing, reversing, and flow adjustment of the oil circuit. The rotary valve could control the small flow rate with high resolution, no acceleration and zero drift of the core movement, high control accuracy, and as the rotary core being directly driven by the motor, a compact structure, stronger anti-pollution characteristics, and other features. The rotary movement of the hydraulic rotary valve core could be realized in many ways, such as through servo motors and hydraulic motors. Compared with the hydraulic sliding valve, the hydraulic rotary valve had the advantages of simple structure, high working frequency, high reliability, and low sensitivity to oil pollution. Therefore, it is being increasingly applied to engineering problems.
关键词：rotary valve; velocity and pressure; throttling groove valve port
