Patent ID: 8596610

Claim:
A universal control valve comprising: a valve body having an inlet and an outlet fluidly connected through a passageway; a valve plug movably mounted in the valve body; a cage mounting space defined within the valve body and enclosed by a bonnet disposed on the valve body, the cage mounting space arranged to receive two different valve cage types including a first valve cage type and a second valve cage type; and a seat ring mounting location defined within the valve body and disposed in the passageway, the seat ring mounting location including: an annular first shoulder that extends inwardly from a surrounding inner wall of the valve body, the annular first shoulder terminating at the inner wall of the valve body, the annular first shoulder including a planar upward facing surface that is perpendicular to an axis of movement of the valve plug; an annular projection disposed radially inwardly of the first shoulder; and a threaded portion; a first seat ring, the first seat ring including an outer portion having a downwardly facing surface that is angled and non-parallel to the annular first shoulder and an annular threaded portion; and a second seat ring, the second seat ring including a mounting flange extending radially outward, away from an upper portion, wherein the annular projection forms a seal by cooperating with the downwardly facing angled surface of the first seat ring when the first seat ring is fully inserted into the seat ring mounting location; and wherein the annular first shoulder supports the mounting flange of the second seat ring when the second seat ring is fully inserted into the seat ring mounting location, the annular first shoulder being positioned to abut the mounting flange.