水压传动, 先导式电磁阀, 低压, 液阻, AMESim

To investigate the influences of liquid resistance on the main valve performance, a hydraulic experimental system for pure water was built, and three sizes of throttle nozzles with diameter 1.2mm, 1mm and 0.8mm were separately serial connected to pilot valve to be tested, then the corresponding pressure-flow characteristics were tested. Using AMESim software, a simulation model was built based on the structure of pilot operated valve. Combining with the experimental data of pressure-flow characteristics, the simulation results of opening pressure, running pressure and poppet displacements were studied. The results indicate that the hydraulic resistance of throttle orifice affects mainly the openning pressure and has only a little influence on the flow characteristics of main valve. The pressure difference between high pressure chamber and low pressure chamber are too small to open the main valve when using 1.2mm throttle oriffice, the openning pressure using 1mm throttle orifice is 0.24MPa, 0.8mm is 0.2MPa. Considering that the small hole is easy to choke, then 1mm throttle orifice is the optimization scheme.

 

water hydraulic, pilot operated solenoid valve, low pressure, hydraulic resistance, AMESim