BEWAKINGSINRICHTING VOOR KLEPPEN VAN EEN STOOMTURBINE.

摘要

Monitoring device for steam-turbine valves having respective electrohydraulic servocontrol devices for directly controlling the valves individually, including means for monitoring operability of the respective servocontrol devices, the operability monitoring means including means for comparing a value of a variable of each one of the servocontrol devices determining a setting of the respective valve with a mean value of corresponding variables of others of the servocontrol devices determining respective settings of valves associated with the other servocontrol devices and for establishing from the comparison if a permissible deviation from the mean value is exceeded by the variable value of the respective one of the servocontrol devices, and means for controlling a valve drive associated with the respective valve controlled by the respective one of the servocontrol devices for driving it in closing direction thereof when the permissible deviation from the mean value is exceeded.