SISTEMA DI PROVA DELLE VALVOLE DI TURBINA A VAPORE

摘要

A valve test system for closing off certain governor valves under steam flow conditions while still maintaining a substantially constant steam flow. A plurality of valve position demand signals is calculated for the respective governor valves with the signals being fully compensated with respect to non-linear flow characteristics of the valve. A valve test signal is injected in the control arrangement prior to the calculation of the valve position demand signals and causes closures of the valves under test and a proportionate further opening of the remaining valves.