Abnormal Opening Mechanism of Pilot-Operated Relief Valve Under Alternating Pressure

Hydraulic vibration exciter (HVE) is an important basic equipment for modern industrial production and scientific experiments. However, when HVE is working, the inevitable alternating pressure in its hydraulic system could give rise to unreliable work of its pilot-operated relief valve (PRV). The present paper aims to determine the abnormal opening mechanism of the PRV under alternating pressure. In this work, a mathematical model of the PRV was presented and validated, and the essential reason for the abnormal opening of the valve was discovered. The influence of the characteristic parameters of alternating pressure on the abnormal opening was investigated. The results show that the characteristic parameters of alternating pressure, including the pressure gradient, pressure amplitude, and pressure valley value, have a significant influence on the abnormal opening of the valve. The abnormal opening can be significantly improved by decreasing the pressure gradient and pressure amplitude, and increasing the pressure valley value.