Analysis of Instantaneous Failure for Cartridge Valves in Integrated Control Hydraulic System

Abstract:

To theoretically reveal the reasons for instantaneous failure of cartridge valves in integrated control hydraulic system，concrete pump hydraulic system was taken as an example,an analytical method of cartridge valve’s on and off states combination based on fluid logic theory was proposed.And this method was testified by the digital model of concrete pumrp hydraulic system.The research result shows that within a certain range of load,an improper opening of single cartridge valve will cause connectivity between the cavities of different valves,which will lead to instantaneous failure to integrated control hydraulic system,but increasing control cavity pressure of cartridge valves can solve the instantaneous failure problem.Finally,the paper presents a design method to increase the working stability of the integrated control hydraulic system.

Key words:cartridge valves; integrated control; instantaneous failure; stability