Patent ID: 8622367
Filing Date: 2014-01-07
Classification: F16K,Y10T

Abstract:
1. A cartridge packing assembly to seal a valve stem in a control valve assembly, the cartridge packing assembly comprising: a seal assembly having a seal component to provide a fluid seal around the valve stem and at least a first anti-extrusion component to substantially prevent extrusion of the seal member about the valve stem; a loading assembly having a loading means comprising at least one spring to provide a predetermined packing stress upon the seal assembly and at least one spacer to couple the at least one spring to the seal assembly; and a one-piece packing retainer adapted to be disposed in an outboard packing box of the control valve assembly, the packing retainer including a cylindrical sleeve portion defining a packing bore receiving the seal assembly and the loading assembly wherein the one-piece packing retainer includes a fixed length between a retainer shoulder and a loading means seating surface to control a loading assembly force that defines the predetermined packing stress in the control valve assembly, the loading means seating surface extending radially inward from the sleeve portion and the retainer shoulder extending radially outward from the sleeve portion for locating the packing retainer relative to the control valve assembly; and a bonnet defining the outboard packing box, wherein the packing retainer is removably disposed in the outboard packing box of the bonnet.