At present

domestic research on gas control valves or other equipment in gas turbines is still lacking

while most of these researches' models remain in a single hydraulic valve or a hydraulic cylinder. So this paper uses Simulink/Simscape software to model the entire gas turbine's gas control valve including the PI controller to the gas pipeline

and conduct simulation analysis for faults such as fixed orifice blockage

wear of the spool valve core and hydraulic oil contamination to discuss their forms and causes. The result shows that

the blockage of the one-sided fixed orifice of the nozzle damper valve

the wear of the slide valve core and the impurities in the hydraulic oil will all cause the valve to respond slowly

or even become clogged and stuck to varying degrees.Finally

for the monitoring of valve data in current power plants some suggestions are thrown out: according to the actual operating conditions

monitoring of the parameters such as the servo valve spool displacement signal and hydraulic cylinder piston displacement can be introduced by using electronic feedback servo valve

to better judge the health status of the valve.