Effect of Dynamic Pressure Feedback Orifice on Stability of Cartridge-Type Hydraulic Pilot-Operated Relief Valve  

作　　者：Yaobao Yin Dong Wang Junyong Fu Hong-chao Jian 

机构地区：[1]School of Mechanical Engineering,Tongji University,Shanghai 201804,China [2]Shanghai Aerospace Control Technology Institute,Shanghai 201109,China [3]China North Vehicle research institute,Beijing 100072,China

出　　处：《Chinese Journal of Mechanical Engineering》2023年第4期227-241,共15页中国机械工程学报（英文版）

基　　金：Supported by National Natural Science Foundation of China(Grant No.52175059);National Key Research and Development Program of China(Grant No.2018YFB2001100).

摘　　要：Current research on pilot-operated relief valve stability is primarily conducted from the perspective of system dynamics or stability criteria,and most of the existing conclusions focus on the spool shape,damping hole size,and pulsation frequency of the pump.However,the essential factors pertaining to the unstable vibration of relief valves remain ambiguous.In this study,the dynamic behavior of a pilot-operated relief valve is investigated using the frequency-domain method.The result suggests that the dynamic pressure feedback orifice is vital to the dynamic characteristics of the valve.A large orifice has a low flow resistance.In this case,the fluid in the main spring chamber flows freely,which is not conducive to the stability of the relief valve.However,a small orifice may create significant flow resistance,thus restricting fluid flow.In this case,the oil inside the main valve spring chamber is equivalent to a high-stiffness liquid spring.The main mass-spring vibration system has a natural frequency that differs significantly from the operating frequency of the relief valve,which is conducive to the stability of the relief valve.Good agreement is obtained between the theoretical analysis and experiments.The results indicate that designing a dynamic pressure feedback orifice of an appropriate size is beneficial to improving the stability of hydraulic pilot-operated relief valves.In addition,the dynamic pressure feedback orifice reduces the response speed of the relief valve.This study comprehensively considers the stability,rapidity,and immunity of relief valves and expands current investigations into the dynamic characteristics of relief valves from the perspective of classical control theory,thus revealing the importance of different parameters.

关 键 词：Pilot-operated relief valve Dynamic pressure feedback orifice STABILITY RAPIDITY IMMUNITY 

分 类 号：TH137.52[机械工程—机械制造及自动化]