各种车辆的全液压转向系统中，转向器可分为转间式和沿阀式两大类。转阀式全液压转向器具有结构紧凑，操纵灵敏轻便，转向轮对方向盘有随动作用等优点，所以在农业机械、工程机械、矿山并下无轨车辆等机械上得到了广泛的应用。但对于大型车辆（如大型铲运机、装载机、卡车等） All kinds of vehicles in the hydraulic steering system, the steering can be divided into the transitional and along the valve two categories. Rotary valve hydraulic steering gear has the advantages of compact structure, sensitive and light operation, the steering wheel has a follow-up effect on the steering wheel, etc. Therefore, it has been widely used in machinery such as agricultural machinery, engineering machinery, mining and under the rail vehicles. But for large vehicles (such as large scrapers, loaders, trucks, etc.)