Valve seat apparatus for use with fluid valves

Patent metadata

Field	Value
Publication number	US-9732873-B2
Application number	US-201615053884-A
Country	US
Kind code	B2
Filing date	Feb 25, 2016
Priority date	Jul 30, 2010
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

A valve seat apparatus for use with fluid valves is described. An example disclosed valve seat apparatus includes a seat ring having an outer surface that includes a first annular recess at a first end of the seat ring, where the first annular recess is to receive a portion of a cage, a second annular recess proximate a second end of the seat ring opposite the first end, and where the second annular recess defines a groove in the outer surface of the seat ring, and a third annular recess adjacent the second annular recess. The example disclosed valve seat apparatus also includes a first seal assembly disposed in the third annular recess and a retainer disposed in the second annular recess to retain the seal assembly in the third annular recess.

First claim

What is claimed is:

1. A valve seat apparatus for use with a fluid valve comprising:
a seat ring having an outer surface that includes:
a first annular recess at a first end of the seat ring, the first annular recess to receive a portion of a cage,
a second annular recess proximate a second end of the seat ring opposite the first end, the second annular recess defining a groove in the outer surface of the seat ring, and
a third annular recess adjacent the second annular recess;

a first seal assembly disposed in the third annular recess; and
a retainer disposed in the second annular recess to retain the seal assembly in the third annular recess.

2. A valve seat apparatus as defined in claim 1 , wherein the first end of the seat ring is to be threadably coupled to the cage.

3. A valve seat apparatus as defined in claim 1 , wherein the retainer includes an anti-extrusion ring at least partially composed of plastic.

4. A valve seat apparatus as defined in claim 1 , wherein the retainer is removable from the second annular recess to enable the seat ring to receive a second seal assembly different from the first seal assembly.

5. A valve seat apparatus as defined in claim 4 , wherein the first or second seal assembly includes a polytetrafluoroethylene seal and an anti-extrusion ring.

6. A valve seat apparatus as defined in claim 5 , wherein the first or second seal assembly is to be used with a process fluid having a temperature between about −100° F. and 600° F., and the other of the first or second seal assembly to be used with a process fluid having a temperature above 600° F.

7. A valve seat apparatus as defined in claim 1 , wherein the first or second seal assembly includes a metal seal or a bore seal.

8. A valve apparatus comprising:
a valve body defining a fluid flow passageway between an inlet and an outlet;
a valve seat coupled to a cage at a first end of the valve seat and disposed within the fluid flow passageway, wherein an outer peripheral surface of the valve seat at a second end of the valve seat opposite the first end includes a seal receiving area and a retainer receiving area, the seal receiving area and the retainer receiving area having different diameters;
a first interchangeable seal to be retained in the seal receiving area; and
a retainer to be coupled to the retainer receiving area to retain the first interchangeable seal.

9. A valve apparatus as defined in claim 8 , wherein the first interchangeable seal is for use with process fluids having temperatures less than 600° F., and further including a second interchangeable seal for use with process fluids having temperatures greater than 600° F.

10. A valve apparatus as defined in claim 8 , wherein the first interchangeable seal includes a polytetrafluoroethylene seal and an anti-extrusion ring.

11. A valve apparatus as defined in claim 8 , wherein the first interchangeable seal assembly includes a metal or bore seal.

12. A valve apparatus as defined in claim 8 , further including a plug to move along an inner diameter of the cage, the plug to sealingly engage the valve seat.

13. A valve apparatus as defined in claim 12 , further including an outer annular recess of the plug to receive a second interchangeable seal to seal an outer diameter of the plug to an inner diameter of the cage.

14. A valve apparatus as defined in claim 13 , wherein the second interchangeable seal includes a graphite piston ring and a bore seal.

15. A valve apparatus as defined in claim 9 , wherein the retainer receiving area includes an annular groove.

16. A valve apparatus as defined in claim 9 , wherein the cage includes an outer diameter flange to engage an inner diameter recess of the valve body.

17. A valve seat comprising:
a body defining an inner and outer diameter, the body having a first end and a second end opposite the first end;
a first annular recess to receive an end of a trim cage, the first annular recess at least partially defining the first end of the body;
a second annular recess to receive a retainer, the second annular recess at least partially defining the second end of the body; and
a third annular recess proximate the second annular recess to receive an interchangeable seal assembly, the first and second annular recesses defining a step profile at the second end.

18. A valve seat as defined in claim 17 , wherein the second annular recess has a smaller outer diameter than an outer diameter of the third annular recess.

19. A valve seat as defined in claim 17 , wherein the second annular recess has a larger outer diameter than an outer diameter of the first annular recess.

20. A valve seat as defined in claim 17 , wherein the interchangeable seal assembly includes a polytetrafluoroethylene seal and an anti-exrusion ring.

Assignees

• Fisher Controls Int Llc

Inventors

• Dobbs Eric Robert
• Geelhart Theodore Paul
• Mcmahon Timothy Arthur
• Alman Paul Taylor
• Qiu Yan

Classifications

• Y10T137/86734

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