Modeling and Simulation Analysis of Speed-Regulating Valve Flow Fluctuations under Differential Pressure Steps

Abstract

As an important component of the movement speed adjustment components of the executive elements in a hydraulic system, the speed-control valve should have good dynamic response ability and dynamic and static flow stability. In the working state, due to the fluctuation of oil supply pressure, load variation, valve spool movement, force variation, etc., the pressure difference between the inlet and outlet of the speed-regulation valve is prone to a step response. Due to the nonlinear relationship between the flow and pressure, the phenomenon of instantaneous fluctuations in the controlled flow occurs, which in turn leads to the unstable phenomenon of the speed of the execution element. Based on the working principle of the internal core components of a speed-control valve with a pressure compensation function, this study establishes a dynamic mathematical model of the valve, which is analyzed using AMEsim software. Aiming at the key problem of sudden changes in the differential pressure steps, the characteristics of a speed-regulation valve are analyzed in relation to the differential pressure increment, spring stiffness, spring preload, and initial opening of the pressure compensator and its viscous damping coefficient. The influence of the above five variables on the flow fluctuation is studied and a reasonable parameter adjustment range is given. The simulation and analysis results provide strong theoretical support for the performance and parameter optimization configuration of the speed-regulation valve.