A machine for preparing beverages, in particular espresso coffee, a valve and a valve unit that can be used in said machine

摘要

A machine (M) for preparing beverages, in particular espresso coffee, comprises a hydraulic circuit, which includes: - a brewing unit (1), comprising at least one first part (la) and one second part (lb), which are able to define between them a brewing chamber, at least the first part (la) being movable with respect to the second part (lb); - a fluid actuator (12), in particular a hydraulic actuator, which can be supplied for causing at least a displacement of the first part (la) of the brewing unit (1) towards the second part (lb); - a water tank (4); - a pump (3) having the inlet connected in fluid communication with the water tank (4) and the outlet or delivery connected in fluid communication with the brewing unit (1) and to the fluid actuator (12); - at least one normally closed unidirectional hydraulic valve (9'), set between the pump (3) and the brewing unit (1), to enable a flow of water towards the brewing unit (1) when the pressure of the water delivered by the pump (3) exceeds a substantially pre-set threshold; - a heater device (8) for heating the water delivered by the pump (3); and - a normally open discharge valve (10'), which has: a main inlet (10