Hydraulic control device for liquid-conducting appliances and systems

A hydraulic control device for liquid-conducting appliances and systems is designed for connection between a source of liquid and an appliance or system using the liquid. The hydraulic control device (1) comprises: - a device body (2', 3 ') having a duct for the liquid (30a, 30b) that extends between an inlet connector (2a) and an outlet connector (3 a); - a flow meter (40, 50) associated to the device body (2\ 3 '); and - a valve arrangement (31, 33-37) associated to the device body (2', 3 '), including a valve member (31), which is displaceable between an opening position and a closing position of the duct for the liquid (30a, 30b), and a control mechanism (33-37) for controlling the valve member (31). The control mechanism (33-37) is switchable on the basis of a detection made by the flow meter (40, 50) in order to displace the valve member (31) from the opening position to the closing position of the duct for the liquid (30a, 30b). The flow meter (40, 50) is a non-mechanical flow meter that includes at least two electrical detection elements (42) that are reachable by liquid that flows in the duct for the liquid (30a, 30b).