Abstract: Apparatus for a network of conduits distributing liquid that is coupled to a supply of liquid and to a network. At least one sensor is coupled in fluid communication with the network and derives a level of demand of liquid from the network. At least one valve is coupled in fluid communication with the supply of liquid and with the network to control the flow of liquid to the network. A control unit is coupled to the sensor and to the valve, to command operation of the valve, and in absence of demand of liquid, to maintain a reduced pressure of liquid in the network relative to the supply pressure. The apparatus has a reservoir that accumulates liquid and releases liquid in response to, respectively, a rise and a drop of pressure of liquid in the network, whereby reduction of pressure by release of liquid is avoided.