Steam chest modifications for improved turbine operations

Abstract From the Canadian patent

Existing steam chests having a plurality of valves which are incapable of operation by individual high pressure valve actuators may be modified to provide apparatus for transferring operation of a steam turbine at less than a full load between a full-arc admission mode and a partial-arc admission mode. For those steam chests of the internal bar lift type, the outboard valves are disconnected from the bar and coupled directly to respective servomotors. As such, the pre-existing servomotor utilized to lift the internal bar as well as, the additional servomotors for the outboard valves are, operatively connected to a conventional control means. In those steam chests of the external bar lift …