Abstract: A jet pump has an inlet, an outlet, a flow path communicating the inlet with the outlet, and a high pressure motive fluid inlet. The motive fluid inlet communicates with the flow path via a motive fluid control valve disposed within a nozzle assembly. A jet of motive fluid is directed toward the outlet by the nozzle assembly in order to pump fluid from the inlet to the outlet via the flow path. The nozzle assembly includes an actuator operatively connected with the control valve to selectively control flow of motive fluid in accord with a pressure difference between the motive fluid and a selected and possibly variable reference pressure.

Abstract: Steam generating apparatus and methods wherein a liquid is recirculated within a boiler by use of a constant speed dynamic feed water pump acting both to feed the boiler and to effect recirculating therein by a jet pump with its jet nozzle in liquid flow series with the dynamic pump. The jet pump also receives water from a steam drum for recirculation through the boiler. In the event of excess feed water supply to the boiler a step-function level control for the steam drum bypasses liquid to a condenser. A second jet pump acts to utilize excess feed water to supply cool water from the condenser well under pressure to the dynamic pump so that no water is bypassed to the condenser under on-design operating conditions. For waste heat recovery to provide shaft power automatically with simplified controls.