Patent ID: 7028712
Filing Date: 2006-04-18
Classification: F16K,Y10T

Abstract:
1. A skirt guided fluid control valve comprising: a valve body having a fluid passageway disposed between a fluid inlet and a fluid outlet; an annular valve seat having a throughbore and being disposed within the fluid passageway; a valve stem moveably mounted within the valve body; and, a valve plug connected to the valve stem and moveable between an open position and a closed position, the valve plug comprising: a cap having first and second sides, the first side connected to the valve stem and the second side adapted to seat against the annular valve seat when the valve plug is in the closed position; a tubular member concentrically coupled to the cap at the second side and arranged to circumferentially engage the throughbore of the annular valve seat to guide the valve between the open and closed position, the tubular member having a wall with an inner surface and an outer surface and at least one perforation to permit fluid flow through the wall wherein the at least one perforation has a window surface between the inner surface and the outer surface, and a blended edge where the window surface meets the outer surface; and, a conical protrusion mounted proximate to the second side of the cap, the protrusion being shorter than the tubular member and promoting laminar fluid flow proximate to the valve plug to substantially reduce hydrodynamic drag.