Structural Optimization And Simulation Analysis Of Pilot Operated Water Pressure Relief Valve

Pilot operated water pressure relief valve as an important element of the hydraulic system, its performance impact is critical to hydraulic systems, hydraulic valve in view of problems such as noise and vibration, cavitation and wear, erosion and drawing erosion, leakage and other key technical problems in order to improve its performance, in reference to the relevant literature and theoretical analysis of the pilot pressure relief valve structure has been optimized.By analyzing the pilot pressure relief valve self-excited vibration of the reason for the pilot spool surge chamber was designed by analyzing the changes in flow force pilot spool, guide the processing piston has an annular groove. Then, based on FLUENT simulation software to establish a flow field simulation model to analyze the static pressure field inside the valve chamber flow field, pressure field vector and the y direction pressure distribution changes, throttle Different structures, different positions, shapes and sizes pilot-operated pressure relief valve on the flow field structure and properties of the annular groove. Simulation results show that:the guide surface of the annular groove of the piston end position, shape and size of the flow field inside the valve chamber greatly influenced the size, in the pilot pressure relief valve on the structural design preferably with a radius of lmm and located piston guide semi-circular end surface of the annular groove of the intermediate position.Based on the working principle of the establishment of the pilot valve mathematical simulation model pilot pressure relief valve by AMEsim software analyzes the pilot pressure relief valve dynamic performance, and studying different main valve and pilot valve fluid resistance of the pilot diameter type pressure relief valve affect dynamic performance. Simulation results show that:the new structure pilot pressure relief valve boosting time of 1.13ms, fast response; pressure rise time of 6.32ms, the system oscillation number of small, fast decay; the amount of pressure overshoot rate 11.6% dynamic voltage error is small, stable performance.Based on the working principle of the establishment of the pilot valve mathematical simulation model pilot pressure relief valve by AMEsim software analyzes the pilot pressure relief valve dynamic performance, and studying different main valve and pilot valve fluid resistance of the pilot diameter type pressure reliefvalve affect dynamic performance. Simulation results show that:the new structure pilot pressure relief valve boosting time of 1.13ms, fast response; pressure rise time of 6.32ms, the system oscillation number of small, fast decay; the amount of pressure overshoot rate 11.6% dynamic voltage error is small, stable performance.From the hydrodynamic lubrication theory, using FLUENT simulation software to analyze the impact of micro-modeling structure on the spool lubricating properties. Simulation results show that:the main spool is formed with a cylindrical shape micro structure, the maximum supporting force can improve its hydrodynamic lubrication properties.3D printing method using the main valve and pilot valve manufactured and elaborated using laser technology to micro-modeling on the main spool processing method.On the basis of theoretical research, to adapt to the future development of hydraulic technology, the pilot pressure relief valve structure of the optimal design and simulation analysis, the research results have certain theoretical and engineering significance.