A regulating valve for fluids for plants, in particular conditioning plants, comprising: at least a valve body exhibiting at least an inlet, at least an outlet and at least a channel which sets the inlet in fluid communication with the outlet, at least a fluid check element operating in the channel, the fluid check element defining a passage opening for fluid between the inlet and the outlet which has a variable size as a function of positions assumed by the check element in relation to the valve body along a predetermined operating path, the passage opening being shaped such that following a movement of the check element over at least an initial and/or final tract of the operating path, the incremental ratio between percentage variation of the area of the passage opening and the percentage displacement of the check element exhibits an absolute value comprised between 0 and 4.00, optionally between 0.00 and 2.50, characterized in that the valve further comprises: a control device configured for: receiving in input at least a first signal relating to an intensity of a physical parameter of a fluid circulating in a first section of a plant and a second signal relating to the intensity of the physical parameter of a fluid circulating in the second section of the plant, generating an output signal as a function of the first signal and the second signal, the output signal being usable for controlling the position of the check element, wherein the passage opening of the fluid check element comprises a longitudinal shaping relating to a longitudinal section with to respect to the prevalent development axis of the channel, exhibiting a progressively growing section from the inlet to the outlet of the valve body. at least a valve body exhibiting at least an inlet, at least an outlet and at least a channel which sets the inlet in fluid communication with the outlet, at least a fluid check element operating in the channel, the fluid check element defining a passage opening for fluid between the inlet and the outlet which has a variable size as a function of positions assumed by the check element in relation to the valve body along a predetermined operating path, the passage opening being shaped such that following a movement of the check element over at least an initial and/or final tract of the operating path, the incremental ratio between percentage variation of the area of the passage opening and the percentage displacement of the check element exhibits an absolute value comprised between 0 and 4.00, optionally between 0.00 and 2.50, a control device configured for: receiving in input at least a first signal relating to an intensity of a physical parameter of a fluid circulating in a first section of a plant and a second signal relating to the intensity of the physical parameter of a fluid circulating in the second section of the plant, generating an output signal as a function of the first signal and the second signal, the output signal being usable for controlling the position of the check element, receiving in input at least a first signal relating to an intensity of a physical parameter of a fluid circulating in a first section of a plant and a second signal relating to the intensity of the physical parameter of a fluid circulating in the second section of the plant, generating an output signal as a function of the first signal and the second signal, the output signal being usable for controlling the position of the check element, wherein the passage opening of the fluid check element comprises a longitudinal shaping relating to a longitudinal section with to respect to the prevalent development axis of the channel, exhibiting a progressively growing section from the inlet to the outlet of the valve body.