A valve connector for infusion medical tubes by means of a fluid introducer (S), comprising: - a tubular body (1) having a cavity, an inlet end (4) adapted for coupling an introducer ( S), and outlet end (6, 7), - a hollow pin (2) arranged axially within the cavity of the tubular body (1) and having a closed terminal (9) oriented towards said inlet end (4) of the tubular and axially spaced body thereof, said hollow pin (2) is in communication with the outlet end (6, 7) of the tubular body (1) and has at least one lateral hole (12) distanced from said terminal ( 9) for communication with the cavity of said tubular body (1), and - an elastic sealing element (3), comprising: - an elastic head (13) having a pre-groove (15) and is normally arranged in a closed condition within said inlet end (4) of the tubular body (1), wherein said pre-grooved (15 ) closes, and which is axially movable against said terminal (9) of the hollow pin (2), by effect of the insertion of said introducer at the input end, to interact with said terminal (9), assuming a deformed open configuration elastically in which the pre-groove (15) opens, - a hollow elastic element (14) attached to said head (13) and interposed between said tubular body (1) and said hollow pin (2) to isolate the cavity of said body tubular (1) in relation to said outlet end (6, 7), said elastic hollow element (14) defining an elastic pushing means that tends to keep said head (13) in said closed condition and having an inner surface (2. 3； 26) to contact said hollow pin (2) to insulate said at least one side hole (12) relative to the cavity of the tubular body (1) when said head (13) is in the aforementioned non-deformed sealing condition previously characterized in that: - the terminal (9) of the hollow pin (2) is formed so that the head (13) of the elastic sealing member (3) assumes said open configuration without crossing the pre-groove (15), - said tubular body (1) positively presses said inner contact surface (23； 26) o
