Valve for pressurized fluids

A valve for pressurized fluids comprising a valve body having an outflow pipe in order to dispense a pressurized fluid along a direction of flow from an inlet to an outlet and comprising:

• a valve seat which is arranged in the outflow pipe and which defines a first zone of the outflow pipe upstream of the valve seat with respect to said direction of flow and a second zone of the outflow pipe downstream of the valve seat with respect to said direction of flow, and
• a cam follower which is capable of moving with respect to the valve seat along an axis (X) between an open position, so as to produce a flow of the pressurized fluid being discharged from the valve at a maximum flow rate, at least one partially open position so as to throttle the flow of the pressurized fluid being discharged from the valve, and a closed position, so as to prevent the flow of the fluid through the pipe and comprising:
• a valve head which is capable of moving into abutment in a fluid-tight manner against an abutment surface of the valve seat;
• a rod with linear movement which is fixedly joined to the valve head, in such a manner that there is defined a through-opening between a lateral surface of the rod and a corresponding internal surface of the valve seat which faces the lateral surface of the rod,
• the through-opening being equal to a first value A when the cam follower is in the at least one partially open position and being equal to a second value B when the cam follower is in an open position, with B>A,
• the valve further comprising actuation means for moving the cam follower with respect to the valve seat, the actuation means being external with respect to the outflow pipe and comprise a lever and an eccentric connection, the lever being connected by means of the eccentric connection to the cam follower in such a manner that a rotation of the lever about a hinging axis (Y) brings about the linear movement along the axis (X) of the cam follower with respect to the valve seat between the closed position, at least one partially open position and open position,
• characterized in that the cam has a profile having at least a first portion, a second portion having a circular-arc-like profile with a centre which is located on the hinging axis (Y) and having a radius a, and a third portion having a circular-arc-like profile with a centre which is located on the hinging axis (Y) and having a radius b, with b>a, the first portion corresponding to a rotation of the lever which is equal to 0°, and wherein the cam follower is in a closed position, the second portion corresponding to a rotation of the lever through an angle greater than 0° and less than or equal to α/2°, in which the cam follower remains in the at least one partially open position, and the third portion corresponding to a rotation of the lever between an angle greater than α/2° and an angle less than or equal to a° in which the cam follower remains in the open position.