全液压转向器广泛应用于车辆转向和船舶液压舵。驾驶人员通过它可以用较小的操纵力实现较大的转向力控制，并且在性能上安全、可靠、操纵上灵活、轻便。

转向器的操纵是全液压式，也就是说在转向柱和转向轮之间没有机械连接，在转向器与转向油缸之间是液压管或软管连接。

当转动方向盘，转向器根据方向盘转动比例输送相对的油量,该油量直接流到操纵缸相应一侧,同时另一侧的油量回到油箱.

BZZ转向器是一种转阀式全液压转向器，具有以下优点：

◎ 消除机械式连动装置，可以降低主机成本，提供可靠轻便的结构； 

◎ 操纵灵活省力,安全可靠； 

◎ 可以很小的力矩进行连续无级控制转动； 

◎ 提供给控制回路以及主机尺寸广泛的选择面； 

◎ 能和多种转向油泵及液压供应系统连接。 

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 .