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提出了描述四通换向阀换向动态特性的数学模型，对四通换向阀换向过程的压力、温度变化及活塞运动规律等动态特性进行了仿真研究；采用激光多普勒频移测试技术，对密闭高压小空间内瞬间多变的活塞运动过程进行了测试；分析了在技向过程中的活塞速度变化及气源压力对换向时间的影响，对于合理确定换向过程最小压差有重要意义。
A mathematical model describing the dynamic characteristics of the four-way reversing valve was proposed. The dynamic characteristics of the four-way reversing valve during the commutation process were analyzed, such as pressure, temperature and piston movement. The laser Doppler shift test Technology was used to test the instantaneous and variable piston movement in a confined high pressure small space. The influence of piston speed and air pressure on the commutation time was analyzed. It is very important for the reasonable determination of the minimum pressure difference There’s important meaning.