Mark Vie Fast Close Solenoid

Dear All,

When ever the turbine trip, the ETD activate. However, I can not found the tripping signal to trigger the fast close solenoid of MSV, CV, IV, RSV.

Basically, those valves have fast acting solenoid, servo or testing solenoid. When turbine trip, the ETD activation so all the emergency fluid was drain through ETD and valves quick closed due to emergency fluid was drained.

The question is, the Fast acting solenoid valve activation or not? or only ETD?

thanks for your advices.
Brighton