| 摘要 |
A pressure independent control valve PICV (1) for controlling the flow of a liquid medium, especially suitable for use in heating or cooling systems, comprising a body (40) defined by a tubular element comprising an inlet duct (2) and an outlet duct (3) coaxial with each other, a central body (4) arranged in an intermediate position and with axis tendentially inclined with respect to said inlet duct (2) and to said outlet duct (3) and comprising an upstream chamber (5) and a downstream chamber (6) coaxial with each other and in communication through an adjustment orifice (7), said upstream chamber (5) and downstream chamber (6) suitable for housing, respectively, a first functional group defined by a control device (8) for controlling the differential pressure between upstream of the adjustment orifice (7) in correspondence of the upstream chamber (5), and downstream of said adjustment orifice, in correspondence with the outlet duct (3), and a second functional group coaxial to said first functional group and defined by an adjustment device (15) suitable for increasing or decreasing the passage of fluid through the adjustment orifice (7), the control valve wherein the adjustment device (15) comprises a single axial actuation means both rotationally operable for a pre-adjustment of the fluid passage area of the adjustment orifice (7) and also operable in axial translation for a modulation of the flow of the fluid through said adjustment orifice and said actuation means are connected to a toothed disk which prevents the accidental change to the pre-adjustment set. Fig. 1 |
