Liquid dispensing device comprising at least one reservoir within which a holding chamber for a liquid is defined, said chamber being capable of communicating with the outside of the reservoir through an outlet opening for liquid dispensing; a ram movable within the holding chamber and capable of assuming a forward end-of-stroke position, in which the ram engages a seat formed at the outlet opening and blocking fluid communication between the holding chamber and the outside of the holding chamber, and a backward end-of-stroke position in which the ram is removed from the seat, wherein a variable volume working chamber capable of communicating with the holding chamber is defined between the ram and the seat; and non-return valve means arranged at the outlet opening and downstream of the seat, said non-return valve means being open or closed when difference between fluid pressure upstream thereof and fluid pressure downstream thereof is higher or lower than a predetermined value, respectively; wherein during the stroke of the ram from the forward end-of-stroke position to the backward end-of-stroke position the liquid flows from the holding chamber to the working chamber, and during the stroke of the ram from the backward end-of-stroke position to the forward end-of-stroke position the liquid is compressed within the working chamber and, upon opening of the non-return valve means, is dispensed out from the working chamber through the outlet opening, wherein compression of the liquid inside the chamber causes the opening of the non-return valve means; and wherein the device further comprises actuating means (21, 22, 23, 24) arranged at the outside of the reservoir and capable of contactlessly controlling motion of the ram, wherein a permanent magnet is fixed to the ram, and wherein the actuating means (21, 22, 23, 24) are capable of controlling motion of the ram by means of magnetic polarity inversion. at least one reservoir within which a holding chamber for a liquid is defined, said chamber being capable of communicating with the outside of the reservoir through an outlet opening for liquid dispensing; a ram movable within the holding chamber and capable of assuming a forward end-of-stroke position, in which the ram engages a seat formed at the outlet opening and blocking fluid communication between the holding chamber and the outside of the holding chamber, and a backward end-of-stroke position in which the ram is removed from the seat, wherein a variable volume working chamber capable of communicating with the holding chamber is defined between the ram and the seat; and non-return valve means arranged at the outlet opening and downstream of the seat, said non-return valve means being open or closed when difference between fluid pressure upstream thereof and fluid pressure downstream thereof is higher or lower than a predetermined value, respectively; wherein during the stroke of the ram from the forward end-of-stroke position to the backward end-of-stroke position the liquid flows from the holding chamber to the working chamber, and during the stroke of the ram from the backward end-of-stroke position to the forward end-of-stroke position the liquid is compressed within the working chamber and, upon opening of the non-return valve means, is dispensed out from the working chamber through the outlet opening, wherein compression of the liquid inside the chamber causes the opening of the non-return valve means; and wherein the device further comprises actuating means (21, 22, 23, 24) arranged at the outside of the reservoir and capable of contactlessly controlling motion of the ram, wherein a permanent magnet is fixed to the ram, and wherein the actuating means (21, 22, 23, 24) are capable of controlling motion of the ram by means of magnetic polarity inversion.