A connecting device for connecting a beverage machine with an external liquid delivery system, e.g. a water distribution network, to supply such liquid to said machine, said connecting device having: - an inlet for a fluid connection to said external system; - an outlet for delivering liquid from said external system via the inlet to said beverage machine; - a valve arrangement (12a,12b) switchable between an open configuration for establishing a fluidic connection between the inlet and the outlet and a closed configuration for interrupting the fluidic connection, such as a valve arrangement (12a,12b) connected to the inlet via a fluid connector e.g. a fluid connector fixed to a frame portion of a body of such device; and - a control unit for switching the valve arrangement (12a,12b) between its open configuration and its closed configuration, characterised in that the valve arrangement (12a,12b) comprises two or more valves (12a,12b) that are in serial fluidic configuration between the inlet and the outlet, at least two such valves (12a,12b) that are in serial fluidic configuration being controlled by the control unit: - in parallel to be both simultaneously open for establishing the fluidic connection between the inlet and the outlet or both simultaneously closed for interrupting the fluidic connection; or - separately so that a first valve of such valves (12a,12b) is open or closed for establishing or interrupting the fluidic connection between the inlet and the outlet as required for supplying liquid to said machine and so that a second valve of such valves (12a,12b) is open as long as the first valve opens and closes as controlled by the control unit and is closed when the first valve is malfunctioning, optionally at least one sensor, e.g. a flowmeter and/or an overfill level sensor, being connected to the control unit for sensing an on-going flow of liquid via the inlet and the outlet after the control unit has attempted to switch the first valve into its closed configuration and for triggering the control unit to switch the second valve into its closed configuration, optionally the control unit being arranged to detect a malfunctioning of at least one valve (12a,12b) to then indicate to a user such malfunctioning via an indicator and/or block the non-malfunctioning valve in its closed configuration with or without automatically switching-off such device. - an inlet for a fluid connection to said external system; - an outlet for delivering liquid from said external system via the inlet to said beverage machine; - a valve arrangement (12a,12b) switchable between an open configuration for establishing a fluidic connection between the inlet and the outlet and a closed configuration for interrupting the fluidic connection, such as a valve arrangement (12a,12b) connected to the inlet via a fluid connector e.g. a fluid connector fixed to a frame portion of a body of such device; and - a control unit for switching the valve arrangement (12a,12b) between its open configuration and its closed configuration, - in parallel to be both simultaneously open for establishing the fluidic connection between the inlet and the outlet or both simultaneously closed for interrupting the fluidic connection; or - separately so that a first valve of such valves (12a,12b) is open or closed for establishing or interrupting the fluidic connection between the inlet and the outlet as required for supplying liquid to said machine and so that a second valve of such valves (12a,12b) is open as long as the first valve opens and closes as controlled by the control unit and is closed when the first valve is malfunctioning, optionally at least one sensor, e.g. a flowmeter and/or an overfill level sensor, being connected to the control unit for sensing an on-going flow of liquid via the inlet and the outlet after the control unit has attempted to switch the first valve into its closed configuration and for triggering the control unit to switch the second valve into its closed configuration,