Patent ID: 9360128
Filing Date: 2016-06-07
CPC Classification: F16J,F16K

Claim Text:
1. A sliding stem control valve comprising: a valve body having an inlet and an outlet fluidly connected through a passageway; a seat ring mounted in the passageway, a control element slidably disposed within the valve body, the control element and the valve seat cooperating to control fluid flow through the valve body; and a seal assembly having a metal/graphite seal ring located between a first backup ring and a second backup ring, a biasing element located adjacent the second backup ring, and a retainer ring holding the biasing element adjacent to the second backup ring, wherein the metal/graphite seal ring includes a graphite ring and a metal envelope at least partially surrounding the graphite ring, the metal envelope including a bottom side, an inner side wall and an outer side wall, and the second backup ring is at least partially disposed within the metal envelope.