This valve is a Mixing type 3-Way Control Valve which is used for Mixing two different fluids. This is achieved proportionally by using instrument signal & valve Positioner. One medium enters the valve body above the upper seat ring and second below the lower the seat ring. Percentage of each medium is controlled by varying the position of the inner valve. As the inner valve approaches seat ring, flowing area is reduced. Mixed media flow out of the valve through common port.