PRESSURIZED FLUID CYLINDER TAP AND A CYLINDER COMPRISING SUCH A TAP

A pressurized fluid cylinder tap (13) comprising a body (16) enclosing a gas passage (17), the gas passage (17) comprising an upstream end (18) and a downstream end (19), the tap (13) comprising a shut-off valve (14) having a shutter (7, 10) element which is movable relative to a valve seat (11) between a closed position and at least one open position, the tap comprising a pivoting lever (1) which is mechanically coupled to the shutter element (7, 10) so that rotation of the lever (1) between a first position and a second position causes motion of the shutter element (7, 10) between the closed and open positions, characterized in that the shut-off valve comprises two distinct shutter (7, 10) elements, respectively first shutter (7) element and second (10) shutter element, the two shutter elements (7, 10) being movable relative to the valve seat (11) between respective closed and open positions, in their respective open positions the two shutter elements (7, 10) defining respective flow passage sections in the gas passage (17), the shut-off valve (14) being configured so that, when the lever is moved from its first position to its second position it causes first the motion of the first shutter (7) toward it open position before causing the motion of second shutter (10) toward its open position, the flow passage section opened by the first shutter (7) being smaller than the flow passage section opened by the second shutter (10).