초록 ▼

A trim insert for a choke assembly is disclosed, wherein the trim insert is a tubular member with a substantially constant inner diameter. A first end of the device is positioned within an adjacent upstream sleeve and a second end is sealingly retained within the discharge channel of the choke assem

A trim insert for a choke assembly is disclosed, wherein the trim insert is a tubular member with a substantially constant inner diameter. A first end of the device is positioned within an adjacent upstream sleeve and a second end is sealingly retained within the discharge channel of the choke assembly. A flange coaxially retains the tubular member between the sleeve and a shoulder of the choke body. The trim insert is made of an erosion resistant material, such as tungsten carbide, hardened steel, or a ceramic. Additionally, the inner surface of the tubular member may be coated with a hardening compound to provide additional erosion resistance.

대표청구항 ▼

What is claimed is: 1. A trim insert for a choke assembly, the choke assembly including a body, a sleeve insert, and a downstream trim component, the body including an upper body section having an upper body orifice, a discharge channel, and a shoulder, the upper body orifice and the discharge chan

What is claimed is: 1. A trim insert for a choke assembly, the choke assembly including a body, a sleeve insert, and a downstream trim component, the body including an upper body section having an upper body orifice, a discharge channel, and a shoulder, the upper body orifice and the discharge channel in coaxial alignment, the upper body orifice having an orifice diameter, the discharge channel having a channel diameter smaller than the orifice diameter thereby forming the shoulder, the sleeve insert retained within the upper body orifice such that a gap is defined between a second sleeve end and the shoulder, the downstream trim component retained within the discharge channel, the trim insert comprising: a tubular member having a first end, a second end, and a flange intermediate the first end and the second end; the first end positioned within the upper body orifice and having first end inner diameter sufficient to stop flow when a shuttle is in a closed position and a first end outer diameter sufficient to fit within the second sleeve end; the flange having a flange outer diameter sufficient to fit within the upper body orifice and sufficient to retain the tubular member between the second sleeve end and the shoulder; and the second end sealingly retained within the discharge channel and having a second end outer diameter sufficient to fit within the discharge channel and sufficient to retain the tubular member against the adjacent downstream trim component. 2. The device of claim 1, wherein said flange has a flange thickness sufficient to withstand shear force when the shuttle is in the closed position. 3. The device of claim 2, wherein the tubular member has a flange reinforcement section immediately adjacent the flange and extending from the flange toward the second end. 4. The device of claim 1, wherein the tubular member has a circumferential groove between the flange and the second end; and the circumferential groove has a groove depth and a groove width sufficient to accommodate a seal ring. 5. The device of claim 4, wherein the tubular member has a tapered section between the circumferential groove and the second end. 6. The device of claim 1, wherein the tubular member is constructed of an erosion resistant material. 7. The device of claim 6, wherein the erosion resistant material is selected from the group consisting of: tungsten carbide, stainless steel, ceramic, and hardened steel. 8. The device of claim 1, wherein the tubular member further comprises: an inner surface and an outer surface; and a wear-resistant coating adhered to the inner surface and the outer surface. 9. A choke assembly comprising: a body including an upper body section having an upper body orifice, a discharge channel and a shoulder; the upper body orifice and the discharge channel in coaxial alignment; the upper body orifice having an orifice diameter; the discharge channel having a channel diameter smaller than the orifice diameter thereby forming the shoulder; a sleeve insert retained within the upper body orifice such that a gap is defined between a second sleeve end and the shoulder; a downstream trim component retained within the discharge channel; a shuttle subassembly including a linearly displaceable shuttle movable to a closed position, wherein flow to the discharge channel is stopped; a flanged static trim component having a substantially constant inner diameter, a first end, a second end, and a flange intermediate the first end and the second end; the first end positioned within the upper body orifice and having first end inner diameter and a first end outer diameter sufficient to provide a seat for the shuttle in the closed position; said first end outer diameter sufficient to fit within the second sleeve end; the flange having a flange outer diameter sufficient to fit within the upper body orifice and sufficient to retain the tubular member between the second sleeve end and the shoulder; and the second end sealingly retained within the discharge channel and having a second end outer diameter sufficient to fit within the discharge channel and sufficient to retain the tubular member against the adjacent downstream trim component. 10. The assembly of claim 9, wherein said flange has a flange thickness sufficient to withstand shear force when the shuttle is in the closed position. 11. The device of claim 10, wherein the tubular member has a flange reinforcement section immediately adjacent the flange and extending from the flange toward the second end. 12. The assembly of claim 9, further comprising: a seal ring between the tubular member and the discharge channel; and the seal ring being positioned between the flange and the second end. 13. The assembly of claim 12, wherein the tubular member has a circumferential groove between the flange and the second end; the circumferential groove having a groove depth and a groove width sufficient to accommodate the seal ring. 14. The assembly of claim 13, wherein the tubular member has a tapered section between the circumferential groove and the second end. 15. The assembly of claim 12, wherein the discharge channel has an annular groove formed therein; the annular groove having a groove depth and a groove width sufficient to accommodate the seal ring; and the annular groove positioned such that the seal ring forms a seal with the tubular member between the flange and the second end. 16. The assembly of claim 9, wherein the tubular member is constructed of an erosion resistant material. 17. The assembly of claim 16, wherein the erosion resistant material is selected from the group consisting of: tungsten carbide, hardened steel, ceramic, and stainless steel. 18. The assembly of claim 17, wherein the tubular member further comprises: an inner surface and an outer surface; and a wear-resistant coating adhered to the inner surface and the outer surface. 19. The assembly of claim 9, wherein the tubular member further comprises: an inner surface and an outer surface; and a wear-resistant coating adhered to the inner surface and the outer surface.