Abstract: A device for wetting a dose of ground coffee in coffee machines, such as espresso machines, particularly but without limitation professional espresso making machines is disclosed. The device includes a source of pressurized water, at least one beverage dispenser unit, a filter holder removably coupled to said dispenser, a water heater placed on the dispenser unit, a water supply system connecting said source of pressurized water with said heater, and a dispensing conduit connecting the heater with the dispenser unit. The device also includes a dispensing valve device inserted in said dispensing conduit for closing and opening the conduit and for feeding heated water to the filter holder and cause it to spread into the dose of ground coffee contained in the filter holder, as well as an electronic control and programming unit connected at least with said source of pressurized water, with said heater and with said dispensing valve device.

Abstract: An apparatus for the preparation and dispensing of doses, in selectable variable volumes, of infusions, particularly of coffee, by means of pressurised water, comprising a cylindrical infusion chamber provided with a closed end and an opposed open end, a piston with an end axially insertable into said infusion chamber via said open end and removable therefrom, water feeding element for feeding a predetermined quantity of pressurised water into said chamber and for opening into the latter in the zone comprised between the end of the piston inserted into the chamber and the closed end of the chamber.

Abstract: An apparatus for the preparation and dispensing of doses, in selectable variable volumes, of infusions, particularly of coffee, by means of pressurised water, comprising a cylindrical infusion chamber provided with a closed end and an opposed open end, a piston with an end axially insertable into said infusion chamber via said open end and removable therefrom, water feeding element for feeding a predetermined quantity of pressurised water into said chamber and for opening into the latter in the zone comprised between the end of the piston inserted into the chamber and the closed end of the chamber.

Abstract: The present invention relates to an apparatus for the preparation and dispensing of doses, in selectable variable volumes, of infusions, particularly of coffee, by means of pressurised water, comprising an infusion chamber provided with a closed end and an opposed open end, a piston with an end axially insertable into said infusion chamber via said open end and removable therefrom, a water feeding element for feeding a predetermined quantity of pressurised water into said chamber and opening into the chamber in the zone comprised between the end of the piston inserted into the chamber and the closed end of the chamber, and a powdered product feeding device for feeding into said infusion chamber a predetermined quantity of powdered product from which to form the infusion in an amount proportional to the volume selected for the dose of infusion to be prepared.