Pivoting valve to regulate the flow of a fluid comprising: - a body that includes; - an inlet hole and an outlet hole for the fluid flow path, - a shutter element of the fluid flow path mounted pivotable on a rotating shaft of the valve body to be able to rotate from an open position to a closed position of the fluid flow path, - a tubular element to channel the flow of fluid inside the body of the valve , the tubular element being located between the inlet hole and the outlet hole , and mounted linearly, so that it can be moved from the outlet hole to the inlet hole when the shutter element is in the open position, - means to actuate the displacement of the tubular element inside the body, , said means comprising a mechanism provided with a first actuating element capable of being actuated from the outside of that body , including that mechanism transmission means for transmitting the movement of that first actuating element to the tubular element that is housed inside the body , characterised in that said first actuating element is rotary and said transmission means include a gear associated to said first actuating element and to a rack joined to the tubular element , said tubular element being susceptible of being displaced when said gear is actuated, wherein the rack is arranged in a groove of guide provided in a surface of the tubular element . - a body that includes; - an inlet hole and an outlet hole for the fluid flow path, - a shutter element of the fluid flow path mounted pivotable on a rotating shaft of the valve body to be able to rotate from an open position to a closed position of the fluid flow path, - a tubular element to channel the flow of fluid inside the body of the valve , the tubular element being located between the inlet hole and the outlet hole , and mounted linearly, so that it can be moved from the outlet hole to the inlet hole when the shutter element is in the open position, - means to actuate the displacement of the tubular element inside the body, , said means comprising a mechanism provided with a first actuating element capable of being actuated from the outside of that body , including that mechanism transmission means for transmitting the movement of that first actuating element to the tubular element that is housed inside the body , characterised in that said first actuating element is rotary and said transmission means include a gear associated to said first actuating element and to a rack joined to the tubular element , said tubular element being susceptible of being displaced when said gear is actuated, - an inlet hole and an outlet hole for the fluid flow path, - a shutter element of the fluid flow path mounted pivotable on a rotating shaft of the valve body to be able to rotate from an open position to a closed position of the fluid flow path, - a tubular element to channel the flow of fluid inside the body of the valve , the tubular element being located between the inlet hole and the outlet hole , and mounted linearly, so that it can be moved from the outlet hole to the inlet hole when the shutter element is in the open position, - means to actuate the displacement of the tubular element inside the body, , said means comprising a mechanism provided with a first actuating element capable of being actuated from the outside of that body , including that mechanism transmission means for transmitting the movement of that first actuating element to the tubular element that is housed inside the body , characterised in that said first actuating element is rotary and said transmission means include a gear associated to said first actuating element and to a rack joined to the tubular element , said tubular element being susceptible of being displaced when said gear is actuated, <EOS>