Experimental study on dynamic and static characteristics of Differential Relay Valve

This study aims to investigate the dynamic and static characteristics of a Differential Relay Valve (DRV). The fact that DRV has a complex physical structure leads to more nonlinear coupling property. Thus, theoretical analysis and simulation are not enough when studying its characteristics. In this article, the static and dynamic performance of a DRV is studied based on a novel test bench with NI Labview platform, and both the input and output gas pressure are detected in real time. The outcomes of the experiment show that both the service brake pressure and the parking brake pressure affect the output gas pressure of the DRV, and determined by the larger one. Moreover, the valve has good dynamical follow-up response performance.