Control valves including valve trim having relative movement between the bonnet and the cage

Patent metadata

Field	Value
Publication number	US-11041573-B2
Application number	US-201916406531-A
Country	US
Kind code	B2
Filing date	May 8, 2019
Priority date	May 8, 2019
Publication date	Jun 22, 2021
Grant date	Jun 22, 2021

Abstract

Control valves including valve trim having relative movement between the bonnet and the cage. A control valve includes a valve body including an inlet, an outlet, and a flow passage connecting the inlet and the outlet. The control valve includes a cage disposed in the flow passage. The control valve includes a control element disposed in the flow passage and shiftable between a first position and a second position. The control valve includes a bonnet securable to the valve body and disposed adjacent the cage. The bonnet is adapted to receive a portion of the cage. The control valve includes a coupling formed between the bonnet and the cage that allows movement between the bonnet and the cage.

First claim

What is claimed is:

1. A control valve, comprising:
a valve body comprising an inlet, an outlet, and a flow passage connecting the inlet and the outlet;
a cage disposed in the flow passage and comprising an external groove;
a control element disposed in the flow passage and shiftable between a first position and a second position;
a bonnet securable to the valve body and disposed adjacent the cage, the bonnet comprising an internal groove and having a portion that engages a portion of the cage, the external groove of the cage and the internal groove of the bonnet positioned adjacent one another when the portion of the bonnet engages the portion of the cage; and
a compressible ring arranged within the internal groove and the external groove to form a coupling between the bonnet and the cage, the coupling allowing movement between the bonnet and the cage,
wherein the portion of the cage comprises an outward facing step, the outward facing step being disposed adjacent the bonnet and wherein the step forms a space, and wherein the portion of the bonnet comprises the internal groove and is disposed within the space formed by the step.

2. The control valve of claim 1 , further comprising a seal, the seal positioned on a surface of the step, the seal arranged to be compressed between the bonnet and the surface of the step of the cage.

3. The control valve of claim 2 , wherein a height of the external groove is less than a height of the internal groove, the compressible ring disposed within the external groove and movable within the internal groove to provide the coupling.

4. The control valve of claim 3 , wherein the seal is a spiral-wound gasket.

5. The control valve of claim 2 , wherein a height of the external groove is greater than a height of the internal groove, the compressible ring disposed within the internal groove and movable within the external groove to provide the coupling.

6. The control valve of claim 1 , further comprising a plug guide carried by the cage and adapted to guide movement of the control element.

7. The control valve of claim 6 , wherein the cage comprises an internal groove and an internal step, the internal step engaged by the plug guide, further comprising a second fastener arranged within the internal groove of the cage, the second fastener engaging a surface of the plug guide to couple the plug guide to the cage.

8. A control valve, comprising:
a valve body comprising an inlet, an outlet, and a flow passage connecting the inlet and the outlet;
a cage disposed in the flow passage and comprising an external groove;
a control element disposed in the flow passage and shiftable between a first position and a second position;
a bonnet securable to the valve body and disposed adjacent the cage, the bonnet comprising an internal groove and having a portion that engages a portion of the cage, the external groove of the cage and the internal groove of the bonnet positioned adjacent one another when the portion of the bonnet engages the portion of the cage; and
a compressible ring arranged within the internal groove and the external groove to form a coupling between the bonnet and the cage, the coupling allowing movement between the bonnet and the cage,
wherein the portion of the cage comprises an outward-facing tapered surface, the compressible ring is sized to cooperate with the outward-facing tapered surface to expand the compressible ring when the compressible ring is being positioned within the external groove.

9. The control valve of claim 8 , wherein the portion of the bonnet comprises an inward-facing tapered surface, the compressible ring is sized to cooperate with the inward-facing tapered surface to compress the compressible ring when the compressible ring is being positioned within the internal groove.

10. The control valve of claim 9 , wherein the internal groove of the bonnet comprises a second inward-facing tapered surface, the second inward-facing tapered surface arranged to compress the compressible ring when the compressible ring is being removed from the internal groove.

11. A valve trim subassembly for use with a valve body comprising an inlet, an outlet, and a flow passage connecting the inlet and the outlet, the valve trim subassembly comprising:
a cage disposable in the flow passage and comprising an external groove;
a bonnet securable to the valve body and disposed adjacent the cage, the bonnet comprising an internal groove and having a portion that engages a portion of the cage, the external groove of the cage and the internal groove of the bonnet positioned adjacent one another when the portion of the bonnet engages the portion of the cage, wherein the portion of the cage comprises an outward facing step, the outward facing step disposed adjacent the bonnet;
a compressible ring arranged within the internal groove and the external groove to form a coupling between the bonnet and the cage, the coupling allowing movement between the bonnet and the cage; and
a seal positioned on a surface of the step, the seal arranged to be compressed between the bonnet and the surface of the step of the cage.

12. The valve trim subassembly of claim 11 , further comprising a control element disposed in the cage.

13. The valve trim subassembly of claim 11 , wherein the portion of the bonnet comprises the internal groove and is disposed within a space formed by the step.

14. The valve trim subassembly of claim 11 , wherein a height of the external groove is less than a height of the internal groove, the compressible ring disposed within the external groove and movable within the internal groove to provide the coupling between the bonnet and the cage.

15. The valve trim subassembly of claim 11 , wherein the portion of the cage comprises an outward-facing tapered surface, the compressible ring is sized to cooperate with the outward-facing tapered surface to expand the compressible ring when the compressible ring is being positioned within the external groove.

16. The valve trim subassembly of claim 15 , wherein a portion of the bonnet comprises an inward-facing tapered surface, the compressible ring is sized to cooperate with the inward-facing tapered surface to compress the compressible ring when the compressible ring is being positioned within the internal groove.

17. The valve trim subassembly of claim 16 , wherein the internal groove of the bonnet comprises a second inward-facing tapered surface, the second inward-facing tapered surface arranged to compress the compressible ring when the compressible ring is being removed from the internal groove.

18. The valve trim subassembly of claim 11 , further comprising a control element and a plug guide, the plug guide carried by the cage and adapted to guide movement of the control element.

19. A control valve, comprising:
a valve body comprising an inlet, an outlet, and a flow passage connecting the inlet and the outlet;
a cage disposed in the flow passage;
a control element disposed in the flow passage and shiftable between a first position and a second position;
a bonnet securable to the valve body and disposed adjacent the cage, the bonnet adapted to receive a portion of the cage; and
a coupling formed between the bonnet and the cage that allows movement between the bonnet and the cage,
wherein the bonnet comprises an internal radial groove and the cage comprises an external radial groove that faces and at least partially overlaps the internal radial groove, further comprising a compressible ring arranged within the internal radial groove and the externa

Assignees

• Fisher Controls Int Llc

Inventors

• Hostetter Steven K
• Ohrt Wesley T

Classifications

• F16K27/02 Primary

  of lift valves (for reducing the flow resistance of screw-spindle lift-valves F16K1/06) · CPC title

• F16K1/46

  Attachment of sealing rings · CPC title

• F16K1/36

  Valve members (for double-seat valves F16K1/44 {; for butterfly valves F16K1/222, F16K1/223}) · CPC title

• F16K27/08

  Guiding yokes for spindles; Means for closing housings; Dust caps, e.g. for tyre valves · CPC title

• F16K1/32 Primary

  Details (details of more general applicability F16K25/00 - F16K51/00) · CPC title