全液壓轉向器廣泛應用于車輛轉向和船舶液壓舵。駕駛人員通過它可以用較小的操縱力實現較大的轉向力控制，并且在性能上安全、可靠、操縱上靈活、輕便。

轉向器的操縱是全液壓式，也就是說在轉向柱和轉向輪之間沒有機械連接，在轉向器與轉向油缸之間是液壓管或軟管連接。

當轉動方向盤，轉向器根據方向盤轉動比例輸送相對的油量,該油量直接流到操縱缸相應一側,同時另一側的油量回到油箱.

BZZ轉向器是一種轉閥式全液壓轉向器，具有以下優點：

◎ 消除機械式連動裝置，可以降低主機成本，提供可靠輕便的結構； 

◎ 操縱靈活省力,安全可靠； 

◎ 可以很小的力矩進行連續無級控制轉動； 

◎ 提供給控制回路以及主機尺寸廣泛的選擇面； 

◎ 能和多種轉向油泵及液壓供應系統連接。 

SCU can be used in the area of steering of vehicle and hydraulic rudder of ships where the operator can use it to control power steering force with light operating force.It is safety ,reliable and smooth in the function and operation. 

The operation of steering units is hydrostatic. That is to say, there is no mechanical connection between the steering column and the steered wheels.Instead there are hydraulic pipes and hoses between steering unit and steering cylinders.

When the steering wheel is turned, the steering unit meters an oil volume proportional to the rate of rotation of the steering wheel.This volume of oil is directed to the appropriate side of the steering cylinder, while simultaneously the displaced oil is directed to tank. 

Model BZZ offer the following advantages:

◎Minimizes steering linkage-reduces cost, provides flexibility in design.

◎Provides complete isolation of load forces from  the control station-provides operator comfort.

◎Provides continuous,unlimited control action with very low input torque.

◎Provides a wide selection of control circuits and meter sizes.

◎Can work with many kinds of power steering pumps or fluid supply .