APPARECCHITURA A VALVOLA DI COMANDO IN PIU MODI PER FLUSSI DI FLUIDO

摘要

A fluid-flow control valve arrangement comprising valve means operable in different conditions including variable-flow, constant-flow and zero-flow mode conditions depending upon predetermined ranges of a prescribed operational parameter, the valve arrangement being useful especially for the control of the flow of fuel in a heating device such as a gas-burning water heating device.