Valve seat apparatus for use with fluid valves

摘要

A valve seat apparatus for use with fluid valves is described. An example valve seat apparatus includes a seat ring having an outer surface that includes a first annular recess and a second annular recess adjacent the first annular recess to form a stepped profile. A seal assembly is disposed within the first groove and a retainer is disposed in the second annular recess to retain the seal assembly in the first annular recess of the seat ring.

主权项

1. A valve trim apparatus for use with a fluid valve, comprising:
a trim cage; a seat ring to be coupled to the trim cage at a first end of the seat ring, the seat ring having an outer surface that includes a first annular recess to define a seal cavity and a second annular recess adjacent the first annular recess to form a stepped profile, the second annular recess at a second end of the seat ring, the second end of the seat ring opposite the first end of the seat ring, wherein the first annular recess has a first diameter, the second annular recess has a second diameter different from the first diameter, the seat ring configured to sealingly engage a flow control member; a seal assembly disposed within the first annular recess; and a retainer to removably attach to the second annular recess of the seat ring to retain the seal assembly in the first annular recess and a surface of the retainer is to directly engage a portion of the seal assembly, the retainer including a first end and a second end, the first end of the retainer opposite the second end of the retainer, wherein the first end of the retainer is to directly contact the seal assembly and the second end of the retainer proximate the second end of the seat ring, wherein the second end of the seat ring does not engage the trim cage, the retainer removable from the second end of the seat ring to enable interchangeability of the seal assembly, wherein the seal assembly is to provide a seal between the outer surface of the seat ring and a surface of a valve body when the retainer is coupled to the seat ring and the valve seat trim apparatus is disposed in the fluid valve.