Abstract: Back pressure regulation in a system including an evaporator is achieved by a valve having an inlet adapted to be connected to an evaporator, an outlet and an interposed poppet and valve seat. A fluid motor is operative to move the poppet and the fluid motor is controlled by a control fluid inlet, a control fluid outlet and a pressure response valve in fluid communication with the inlet.

Abstract: An energy source for a closed cycle engine including a boiler (10) having a working fluid chamber (12) in heat exchange relation with a reaction chamber (14). A closed flow path loop (16, 34, 36, 38, 44, 46, 52) including a turbine (18) receives working fluid from the fluid chamber, provides a power output and returns the fluid to the chamber. Lithium (80) is reacted with water (70) in the reaction chamber (14) to generate heat for heating the working fluid and hydrogen. Oxygen, obtained by decomposition of sodium superoxide (82) elsewhere in the system, is fed to the reaction chamber (14) and combined with the hydrogen to provide water and additional heat for the working fluid.

Abstract: A hydraulic power supply system utilizing a turbine-driven pump in a hydraulic circuit and a solid propellant gas generator providing gas for driving the turbine. A gas pressure relief valve is operable to maintain the gas generator at constant pressure and has a range of pressure settings to vary the burn rate of gas generator and, thus, the power delivered to the turbine dependent upon the flow demands on the pump. There is a relatively low pressure setting when there is a reduced flow demand on the pump. The control provided by the settable hot gas relief valve reduces the size and weight of a number of components of the hydraulic supply system.

Abstract: A rotary electric machine including a stator, a rotor separated from the stator by an air gas journalled for rotation relative to the stator about an axis of rotation and electrical windings carried by at least one of the rotor and the stator. A cooling liquid flow path is provided for cooling the windings and a gas vent passage is disposed in the rotor, to open to the air gap and introduce gas into the gap, to prevent the entry of liquid coolant and/or drive accumulated liquid coolant out of the air gap.