Abstract: The invention generally relates a linear or roto-linear actuator comprising a combination of electrical and hydraulic actuator components for providing a combined electric and hydraulic-driving force.

Abstract: An improved hydraulic auxiliary drive system for driving the normally non-driven wheels of a vehicle is disclosed. A variable displacement motor having a tiltable swash plate operable between zero and full displacement positions drives the normally non-driven wheels and a variable displacement pump supplies pressure fluid to the motor. A spring biases the swash plate toward its zero displacement position and a servo mechanism is connected with the swash plate for tilting the same. A first supply delivers pressure fluid to the servo mechanism to tilt the swash plate toward its full displacement position and a second supply delivers pressure fluid to the servo mechanism to tilt the swash plate toward its zero displacement position. The first supply includes a pressure control valve to control the pressure thereof.

Abstract: A method of varying turbine output from approximately 85% rated load down to approximately 65% rated output or alternatively from 100% down to approximately 85% where the turbine forms part of a supercritical installation having a steam generator for generating steam to a predetermined amount in excess of critical pressure. The installation includes a feed water pump or maintaining pressures in the steam generator to the predetermined amount in excess of critical pressure, a division valve and a turbine control valve. Output is varied by maintaining the control valve in a fully or partially open position, the division valve in a fully open position and varying the delivery pressure of the feed water pump from the predetermined supercritical pressure to a pressure slightly above critical.