Joint linkage actuating means for a valve

1. A control valve comprising:

a passage path for a fluid inside the control valve and that puts in communication an inlet with an outlet;

an obstruction element arranged so as to be mobile between a closing position, in which it obstructs the passage path impeding the passage of the fluid from the inlet towards the outlet, and an opening position, in which it allows said passage, and;

movement means for operating the movement of the obstruction element between said opening position and said closing position and vice-versa;

said movement means comprising a joint linkage and an actuator element reciprocable and connected to the joint linkage in such a way that, in correspondence to the reciprocation of the actuator element, the joint linkage extends and contracts causing a reciprocation of the obstruction element to which the joint linkage is connected,

wherein the joint linkage is configured in such a manner that with a constant actuation speed of the actuator element, the speed of approach of the obstruction element towards the closing position decreases;

wherein the joint linkage comprises a rod that is hinged directly from one side to the free end of the actuator element so that the opposite end of the rod exercises a reciprocal push on the obstruction element as a consequence of the reciprocation of the actuator element; and

a push element of a piston, provided with an end connected to the obstruction element, the push element comprising a passing slot into which the end of the actuator element is inserted in a passing manner in such a way as to reciprocate and wherein the rod is placed into the slot and hinged from one side to a point of the actuator element and from the opposite side to a wall of the slot and wherein one or more bushings are included, arranged in the end and/or in the terminal end of the actuator element.

2. The control valve, according to claim 1 , wherein the actuator element has such a length that its terminal part exits from the opposite side of the slot into which it is inserted in such a way as to allow the application of a further bushing in said exit terminal part.

3. A control valve comprising:

a passage path for a fluid inside the control valve and that puts in communication an inlet with an outlet;

an obstruction element arranged so as to be mobile between a closing position, in which it obstructs the passage path impeding the passage of the fluid from the inlet towards the outlet, and an opening position, in which it allows said passage;

movement means for operating the movement of the obstruction element between said opening position and said closing position and vice-versa;

said movement means comprising a joint linkage and an actuator element reciprocable and connected to the joint linkage in such a way that, in correspondence to the reciprocation of the actuator element, the joint linkage extends and contracts causing a reciprocation of the obstruction element to which the joint linkage is connected;

wherein the joint linkage is configured in such a manner that with a constant actuation speed of the actuator element, the speed of approach of the obstruction element towards the closing position decreases; and

a seat, internal to the valve, into which the obstruction element is placed slidingly and wherein the joint linkage is arranged into said seat and is interposed between the obstruction element and a back wall of the seat;

wherein a part of the passage path comprises an annular branch that rotates around the seat to then converge at the path.