Abstract: On the basis of briefly introducing the application and structure of concrete spraying vehicle with the articulated bidirectional driving， and in view of the existing safety risk in usage of the articulated bidirectional driving vehicles， the working principle of steering closure valve to realize bidirectional driving and steering was put forward， and the calculation method of the maximum steering resistance moment of the vehicle was introduced in detail. Compared with the test results， the error of maximum steering resistance moment calculated by the virtual displacement theory is less than 5%. The practice showed that this kind of steering technology can satisfy the requirements of the steering system for the concrete spraying vehicle with the articulated bidirectional driving， and it can also provide reference for the design of similar vehicles.

Key words: Concrete spraying vehicle, Bidirectional driving, Articulated, Steering system, Closure valve