There is a balanced plug valve with a contour shaped wall. The contour shaped wall forms a gap with an edge of a balanced plug. Fluid is able to flow through an input port, through the balanced plug, Plug Valvesthrough the gap, and out an output port. The shape of the contour and the relative position of the balanced plug to the contour shaped wall affect the modulation of the rate of the fluid flow through the gap,Globe Valves and thus, through the valve. Multiple possible variations of the dimensions of the contour shaped wall make possible a multitude of flow rate verses valve stroke relationships. GATE VALVESFurther, the use of a balanced valve decreases friction forces on the plug which allows for smaller, more efficient, and more economical valve actuators. A balanced plug valve, comprising: a valve body having an inlet port and and outlet port; a balanced plug mounted on a valve stem and having a plug wall, an edge of said plug wall having a bulging tapered profile with regard to adjacent surfaces of the plug wall, said balanced plug having an opening extending therethrough; and, at least one contour wall having a tapered contour surface proximal to an end of said balanced plug, wherein the contour surface defines a gap with said balanced plug at open plug positions which characterizes fluid flow through said opening in said balanced plug between said inlet and outlet ports and wherein the contour shaped wall has varying radii of curvature at varying locations along said contour shaped wall. The present invention is directed to a balanced plug valve. The valve has a valve body with at least an input port and an output port. Typically, there is a valve bonnet having a side facing an interior of the valve body. The bonnet is removably attached to the valve body at a bonnet aperture. A valve stem is slidably mounted through the bonnet or the valve wall. The valve stem is connected at a first end to an actuator at a location exterior to said valve body. The valve stem has a second end located within the interior of the valve body. A balanced plug is mounted on the interior valve stem end. At least one wall has a contour shape located on the interior. The wall is tightly sealable with the balanced plug at a closed balanced plug position. The wall is dimensioned to form a variable gap with the balanced plug, through which fluid flows, as the balanced plug is displaced. The contour shape, which determines the flow area, influences the fluid flow rate relative to a plug position or displacement.

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