FWRVs (Four-way reversing valves) are widely used to switch operating conditions in air conditioner systems. Most previous research focused on the efficiency of the FWRVs in heat pump systems. However, the vibrations during the valve reversing processes are not yet well investigated. The friction-induced vibration (FIV) is generated when the slider slides on the valve seat under the high pressure in the valve chamber. In this study, an novel FWRV is proposed to reduce the FIV and improve the fluency during the valve reversing process. The pressure change in the chamber is obtained using CFD (computational fluid dynamics) simulations. Experimental tests are performed to analyze the performance of the novel FWRV. Short-term RMS is employed to evaluate the vibration energy from the measured signal. The FIV acceleration signals generated in FWRV reversing process are periodic impulsive vibrations. A new method named SKNPS (Spectral Kurtosis and Number of Peaks spectrum), which is based on the decomposition criterion of Spectral Kurtosis (SK) and Number of Peaks (NP), is proposed to further analyze the duration of the reversing process. The results indicate that the vibrations of the novel FWRV are reduced and the reversing process is more fluent compared with the prototype valve.

FWRV（四通换向阀）广泛用于切换空调系统的运行条件。以前的大多数研究都集中在热泵系统中 FWRV 的效率上。然而，阀门换向过程中的振动尚未得到很好的研究。当滑块在阀腔内的高压作用下在阀座上滑动时产生摩擦振动（FIV）。在这项研究中，提出了一种新型 FWRV 来降低 FIV 并提高阀门换向过程中的流畅性。使用 CFD（计算流体动力学）模拟获得腔室中的压力变化。进行实验测试以分析新型 FWRV 的性能。短期 RMS 用于评估来自测量信号的振动能量。FWRV 倒车过程中产生的 FIV 加速度信号为周期性脉冲振动。提出了一种基于谱峰度（SK）和峰数（NP）分解准则的新方法SKNPS（谱峰度和峰数谱），以进一步分析反转过程的持续时间。结果表明，与原型阀相比，新型FWRV的振动减小，换向过程更加流畅。