(EP83652-B)      An energy-saving pressure reducer for use with a high-pressure fluid line in an environment having an electrical grid, the reducer comprising: a fluid motor having a high-pressure inlet for connection to the high-pressure fluid line and a low-pressure exhaust outlet for connection to a low-pressure fluid utilisation device, the flow of fluid through the motor causing it to rotate, characterized in that the pressure reducer further comprises: a an asynchronous generator coupled to the fluid motor for rotation therewith, - a normally open switch for connecting the output of the generator to the electrica- grid, and - a sensor responsive to the flow of fluid through the motor for closing the switch in response to detecting a flow of fluid through the motor and for reopening the switch in response to detecting the cessation of fluid flow through the motor whereby the generator is disconnected from the electrical grid. (9pp)i    (US4829196-A)      The pressure of fluid supplied by a high-pressure line is reduced to a lower pressure suitable for a low-pressure utilisation device located in an environment having an electrical grid by interposing a fluid motor between the high-pressure line and the low-pressure utilisation device such that operation of the latter causes the high-pressure fluid to operate the motor and to exhaust into the utilisation device. The fluid motor drives an asynchronous generator with all output connected to the electrical grid through a switch having normally open state. The switch is maintained in a closed state only during operation of the motor by providing, for example, a pressure sensor in the exhaust of the motor for sensing the passage of fluid through the motor.    As long as the utilisation device is furnished with low-pressure fluid, the switch is closed and the output of the generator is fed directly into the power grid of the local environment, thus reducing the amount of power being supplied to the local environment by the power company. (6pp)