The detection unit detects the pressure between the outlet of the expander and the inlet of the pump.

The temperature of the working fluid at the entrance of the expander (21) is set such that the temperature of the working fluid at the outlet of the expander (21) is higher than the saturation temperature on the high pressure side of the cycle.

The discharge passage is connected to the portion of the operating fluid passage which is located between the outlet of the expander and the inlet of the pump.

The controller closes the on/off valve when the engine is running but the output from the expander is not needed.

A main valve mechanism regulates the flow of gas through a main flow passage connecting the inlet and outlet of the regulator.

The detection unit detects the pressure between the outlet of the expander and the inlet of the pump.

The high-temperature steam-laden exhaust stream (30) drives an expander (32) to produce a power output.

The temperature of the working fluid at the entrance of the expander (21) is set such that the temperature of the working fluid at the outlet of the expander (21) is higher than the saturation temperature on the high pressure side of the cycle.

The outlet (82) of the electronic expansion valve (80) is connected to the inlet (62) of the evaporator (60) by means of a tube (74).

The outlet (54) of the condenser (50) is connected to the inlet (81) of the electronic expansion valve (80) by means of a tube or conduit (73).

First pressure regulator means the pressure regulator having the container pressure as its inlet pressure

The switch provides an operating state of the pressure reducing valve in maintaining a predetermined outlet pressure by enabling the pressure reducing valve to be monitored.

An inflow port and an outflow port are formed in the cylinder of the expander.

A vapor state expander is provided producing mechanical work, and a compressing unit is at least partially operative responsive to the mechanical work output of the vapor state expander.

An outlet (B) of the first heat exchanger (4) is connected to the inlet (C) and the outlet (D) of the expansion valve (9) respectively by check valves (16, 15).