System for dispensing a fluid substance

A dispensing system (100) comprising a container (5) configured to accommodate a fluid substance (S), the container comprising a hollow stem (4) and dispensing means (6) configured to deliver into a cavity (4A) of the hollow stem (4), following a translation of the hollow stem (4), said substance (5) under pressure, and a cap (1), the cap comprising a base body (2) in which a first seat (3) is defined, the seat being configured to sealedly couple to said hollow stem (4), the base body at least partially defining a conduit (7A, 7B, 7C), the conduit (7A, 7B, 7C) having a first end in fluid flow communication with said seat (3) and a second end associated with a spray nozzle (8), a pressure regulator (9) being provided on the conduit (7A, 7B, 7C) and being configured to regulate a passage section (20) of said substance (S) as a function of the pressure present in the cavity (4A) of the stem (4) in order to reduce the passage section if the pressure in said cavity (4A) increases and to increase the passage section if the pressure present in the cavity (4A) decreases, this to maintain a pressure, downstream of the pressure regulator (9) that is substantially constant even in the presence of a variable pressure upstream of the regulator (9), characterized by the fact that on the conduit (7A, 7B, 7C), between the pressure regulator (9) and the nozzle (8) there is at least a valve element (10) configured to close the conduit (7A, 7B, 7C) when a pressure lower than a predetermined threshold is present inside it, and to open the conduit when the pressure in a duct is higher than said threshold, the conduit (7A, 7B, 7C) being at least partially defined by a membrane element (11) which supports a first shutter (12) of the pressure regulator (9) and a second shutter (13) of the valve element (10), the first shutter (12) and the second shutter (13) being integrally made with said membrane (11).