Packing apparatus and related methods to identify proper loading for valve packing

• US 10,443,742 B2
• Filed: 11/01/2017
• Issued: 10/15/2019
• Est. Priority Date: 11/01/2017
• Status: Active Grant

• Current Assignee: Fisher Controls International LLC (Emerson Electric Company)
• Original Assignee: Fisher Controls International LLC (Emerson Electric Company)
• Inventors: Hostetter, Steven Keith, Ohrt, Wesley Tyrel
• Primary Examiner(s): Bastianelli, John
• Application Number:
  US15/800,977
• Publication Number:
  US 20190128429A1
• Time in Patent Office: 713 Days
• Field of Search: 251214, 251318, 137559, 277522-523
• CPC Class Codes: F16J 15/186 using springs
• CPC Class Codes: F16K 27/041 cylindrical slide valves
• CPC Class Codes: F16K 3/0227 Packings
• CPC Class Codes: F16K 3/243 Packings F16K3/246 takes precedence
• CPC Class Codes: F16K 41/02 with stuffing-box ; Sealing rings

Abstract

An apparatus to identify proper loading for valve packing includes a packing follower for a fluid control valve. The packing follower has a cavity to receive a spring and at least a portion of a packing spacer. The apparatus also includes a first aperture disposed on an outer surface of the packing follower extending to the cavity to expose a portion of the spring.

Claims

1. A method comprising:

positioning a spring in a cavity extending through a lower portion of a packing follower and into an upper portion of the packing follower, the lower portion having an outer cylindrical profile having a threaded surface and the an upper portion having a first planar surface perpendicular to a longitudinal axis of the packing follower and a second planar surface parallel to the longitudinal axis, the second planar surface connected to the first planar surface to form a recess on a top surface of the cylindrical profile, and a first aperture along the longitudinal axis disposed in the first planar surface to receive a valve stem;

threadably coupling the lower portion of the packing follower to a bore of a bonnet of a fluid valve; and

adjusting the packing follower based on an appearance of the spring to change a load provided to a packing material disposed in the bore, a second aperture positioned in the second planar surface of the upper portion of the packing follower to expose a peripheral portion of the spring.

2. The method of claim 1, wherein adjusting the packing follower includes rotating, via a tool, the packing follower relative to the bore of the bonnet, the tool to engage the recess disposed on the top surface of the cylindrical profile.

3. The method of claim 1, wherein the spring includes a first washer and a second washer, and wherein adjusting the packing follower includes decreasing a gap between the first washer and second washer until the gap satisfies a visual criterion.

12. The apparatus of claim 1, wherein an edge between the top surface and the threaded surface of the lower portion is a chamfered edge.

13. The apparatus of claim 1, wherein the lower portion includes an inner circumferential surface and a bottom surface, the inner circumferential surface having a chamfered edge between the inner circumferential surface and the bottom surface.

14. The apparatus of claim 13, wherein a first end of the chamfered edge in contact with the inner circumferential surface defines a first inner diameter of the lower portion and a second end of the chamfered edge in contact with the bottom surface defines a second inner diameter, the first inner diameter less than the second inner diameter.

4. An apparatus comprising:

a packing follower for a fluid control valve, the packing follower having a first aperture along a longitudinal axis of the packing follower to receive a valve stem, a lower portion having an outer cylindrical profile having a threaded surface, an upper portion having a first planar surface perpendicular to the longitudinal axis and a second planar surface parallel to the longitudinal axis, the second planar surface connected to the first planar surface to form a recess on a top surface of the cylindrical profile, and a cavity extending through the lower portion and into the upper portion to receive at least a portion of a packing spacer;

a plurality of springs disposed in the cavity; and

a second aperture disposed in the second planar surface of the upper portion of the packing follower extending to the cavity to expose a peripheral portion of the plurality of springs.

5. The apparatus of claim 4, wherein the packing follower removably couples to a portion of a bonnet of the valve, the packing follower to be partially disposed in the bonnet.

6. The apparatus of claim 4, wherein the recess disposed on the top surface of the cylindrical profile is to receive a tool for adjusting the packing follower.

7. The apparatus of claim 6, wherein the recess at least partially surrounds the second aperture.

8. The apparatus of claim 4, further comprising the packing spacer, wherein the plurality of springs is positioned between the packing follower and the packing spacer.

9. The apparatus of claim 4, wherein the packing follower includes a third aperture, opposite the second aperture, extending to the cavity, the plurality of springs to be positioned between the second aperture and the third aperture.

10. The apparatus of claim 4, wherein the plurality of springs include Belleville washers.

11. The apparatus of claim 10, wherein the cavity includes a circumferential surface to receive the Belleville washers.

15. An apparatus comprising:

a fluid control valve having a packing follower, a cavity extending through a lower portion of the packing follower and into an upper portion of the packing follower, the cavity at least partially defining a first aperture along a longitudinal axis of the packing follower and disposed in a first planar surface of the upper portion, the first planar surface perpendicular to the longitudinal axis, and a second aperture positioned on a second planar surface of the upper portion parallel to the longitudinal axis, the first aperture to receive a valve stem and the second aperture to expose a peripheral portion of a plurality of springs positioned in the cavity, wherein the lower portion has an outer cylindrical profile having a threaded outer surface, the threaded outer surface of the lower portion to threadably engage an inner surface of a bonnet of the fluid valve, and wherein the first planar surface is connected to the second planar surface to form a recess on a top surface of the cylindrical profile.

16. The apparatus of claim 15, wherein a central axis of the first aperture is the longitudinal axis and the central axis of the first aperture is substantially perpendicular relative to a central axis of the second aperture.

17. The apparatus of claim 16, wherein the cavity further defines a third aperture positioned adjacent the first aperture and the second aperture to further expose the plurality of springs, a central axis of the third aperture substantially perpendicular relative to the central axis of the first aperture and the central axis of the second aperture.

18. The apparatus of claim 15, wherein the recess is to receive means for adjusting the packing follower.

19. The apparatus of claim 15, wherein the cavity includes a circumferential wall to engage a peripheral edge of the plurality of springs.

20. The apparatus of claim 15, wherein the plurality of springs is to be positioned between the first aperture and the second aperture.

21. An apparatus comprising:

a packing follower to be threadably coupled to a bonnet of a fluid control valve, the packing follower having a first aperture along a longitudinal axis of the packing follower disposed in a first planar surface of an upper portion of the packing follower perpendicular to the longitudinal axis to surround at least a portion of a valve stem and a packing spacer and a second planar surface parallel to the longitudinal axis, wherein the packing follower includes a lower portion having an outer cylindrical profile having a threaded surface and extending radially outward from the second planar surface of the upper portion and a cavity extending through the lower portion and into the upper portion;

a first recessed area formed on a top surface of the cylindrical profile where the first planar surface connects to the second planar surface to receive means for adjusting the packing follower; and

a second aperture disposed in the second planar surface to expose an outer portion of means for urging the packing follower away from the packing spacer.

22. The apparatus of claim 21, further including a second recessed area, different from the first recessed area, disposed on the packing follower to receive the means for adjusting.

23. The apparatus of claim 22, wherein the first recessed area and the second recessed area of the packing follower are substantially flat and perpendicular relative to each other.

24. The apparatus of claim 22, wherein a third aperture is disposed on or adjacent the second recessed area to further expose the means for urging.

25. The apparatus of claim 24, wherein a portion of the means for urging is to be positioned between the second aperture and the third aperture.