IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0006237
(2011-01-13)
|
등록번호 |
US-8490652
(2013-07-23)
|
발명자
/ 주소 |
- Bohaychuk, Larry J.
- McNeill, Mark K.
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
8 인용 특허 :
30 |
초록
▼
Cage valve, flow trim components and methods for reduced fracturing of flow trim. The valve is of the type having flow trim arranged across an inlet bore and aligned with an outlet bore, and including a stationary tubular cage and an external cylindrical flow collar slidable along the side wall of t
Cage valve, flow trim components and methods for reduced fracturing of flow trim. The valve is of the type having flow trim arranged across an inlet bore and aligned with an outlet bore, and including a stationary tubular cage and an external cylindrical flow collar slidable along the side wall of the cage to cover or uncover one or more flow ports in the cage side wall. The tubular cage is formed such that, at least in the ported portion in which the flow ports are formed, the cage includes a tubular outer cage member and a tubular inner cage member, the inner cage member and the outer cage member being formed from a tungsten carbide material, being concentrically aligned, having a length to span at least the ported portion, and being joined together by bonding at an interface formed between the inner cage member and the outer cage member.
대표청구항
▼
1. A valve having a fluid flow path extending therethrough which is to be restricted or closed, comprising: a hollow valve body assembly having an inlet bore and an outlet bore substantially at right angles and a main bore which is an extension of the outlet bore and which communicates with the inle
1. A valve having a fluid flow path extending therethrough which is to be restricted or closed, comprising: a hollow valve body assembly having an inlet bore and an outlet bore substantially at right angles and a main bore which is an extension of the outlet bore and which communicates with the inlet bore;a flow trim positioned in the main bore, the flow trim comprising a stationary tubular cage having a side wall, and an external cylindrical flow collar adapted for sliding movement along the side wall of the cage, the side wall of the cage forming an internal bore aligned with the outlet bore and having a ported portion between its ends formed with one or more flow ports, the external flow collar being adapted for movement between a closed position, wherein the one or more flow ports are fully covered by the external flow collar, and an open position, wherein each of the flow ports is fully or partially uncovered by the external flow collar, whereby fluid may enter the valve through the inlet bore, pass through the one or more flow ports at reduced pressure and continue through the outlet bore;a bonnet disengagably connected with, and closing, an upper end of the valve body;a stem for biasing the external flow collar over the one or more flow ports; andthe tubular cage being formed such that at least the ported portion includes a tubular outer cage member and a tubular inner cage member, the inner cage member and the outer cage member being formed from a tungsten carbide material, being concentrically aligned, having a length to span at least the ported portion, and being joined together by bonding at an interface formed between the inner cage member and the outer cage member. 2. The valve of claim 1, wherein the interface is filled with a ductile bonding material. 3. The valve of claim 2, which further comprises one or more sleeve members, coatings or inserts in the interface between the inner and outer cage members. 4. The valve of claim 2, wherein the ductile bonding material is a solder, brazing or cement material. 5. The valve of claim 2, wherein the ductile bonding material is a solder or brazing material. 6. The valve of claim 5, wherein the inner cage member and the outer cage member are formed from different grade tungsten carbide materials. 7. The valve of claim 5, wherein the inner cage member and the outer cage member are formed with different thicknesses. 8. The valve of claim 5, wherein one of the inner cage member and the outer cage member is formed from a tungsten carbide material having a hardness between about 92 and 94 Ra and the other of the inner cage member and the outer cage member is formed from a tungsten carbide material having a hardness less than 90 Ra. 9. The valve of claim 5, wherein the outer cage member is formed from a tungsten carbide material having a hardness between about 93 and 94 Ra, and the inner cage member is formed from a tungsten carbide material having a hardness between about 88 and 90 Ra. 10. The valve of claim 5, wherein one of the inner cage member or the outer cage members is seated with the other of the cage members. 11. The valve of claim 5, wherein the inner cage member and the outer cage member are coextensive along their entire lengths. 12. The valve of claim 5, wherein the one or more flow ports are arranged to include one or more pairs of diametrically opposed main flow ports. 13. The valve of claim 12, wherein there is one pair of diametrically opposed main flow ports. 14. The valve of claim 12, which further comprises a tubular sleeve positioned in the main bore across the inlet bore and forming at least one side port communicating with the inlet bore, the flow trim being positioned within the tubular sleeve, and wherein the bonnet closes the upper end of both the valve body and the tubular sleeve. 15. The valve of claim 14, wherein the at least one side port is aligned with the inlet bore, and one pair of the one or more pairs of the diametrically opposed main flow ports is arranged such that a line through a midpoint of the diametrically opposed main flow ports is parallel to a centre axis of the inlet bore. 16. The valve of claim 15, further comprising: at least a pair of diametrically opposed secondary flow ports formed in the side wall of the cage, the secondary flow ports having a smaller diameter than a diameter of the main flow ports and each pair of secondary flow ports being positioned with an axis which is offset by 90° from the axis of one of the pairs of main flow ports and closer to the body outlet than are the main flow ports. 17. The valve of claim 14, wherein: the inlet bore and the outlet bore are arranged in a T-shape to provide a body side inlet, a body outlet and an insert chamber at the intersection of the body side inlet and the body outlet; andthe tubular sleeve and the flow trim are arranged as a removable insert assembly positioned in the insert chamber, the insert assembly comprising:(i) the tubular sleeve being adapted as a tubular cartridge having a side wall forming an internal bore and the at least one side port communicating with the body side inlet, whereby fluid may enter through the at least one side port from the body side inlet;(ii) the flow trim being positioned in the cartridge internal bore, the flow trim comprising the tubular cage aligned with the body outlet, and the external flow collar slidable along the side wall of the cage, the cage side wall forming the one or more pairs of diametrically opposed main flow ports located to overlap the intersection of the axes of the body side inlet and the body outlet, and aligned with the at least one side port of the tubular cartridge to communicate with the side port, whereby fluid from the body side inlet may enter the cage bore at reduced pressure and pass through the body outlet;(iii) the bonnet being disengagably connected with, and closing, the upper end of the tubular cartridge and the body; and(iv) the stem being adapted for biasing the flow collar over the main flow ports. 18. The valve of claim 17, further comprising: at least a pair of diametrically opposed secondary flow ports formed in the side wall of the cage, the secondary flow ports having a smaller diameter than a diameter of the main flow ports and each pair of secondary flow ports being positioned with an axis which is offset by 90° from the axis of one of the pairs of main flow ports and the secondary flow ports being arranged closer to the body outlet than are the main flow ports. 19. The flow trim as defined in claim 5. 20. The tubular cage as defined in claim 5. 21. A method of reducing fracturing of a flow trim component in a valve having a fluid flow path extending therethrough which is to be restricted or closed, the valve being of the type which comprises a hollow valve body assembly with an inlet bore and an outlet bore substantially at right angles and a main bore which is an extension of the outlet bore and which communicates with the inlet bore; a flow trim positioned in the main bore, the flow trim comprising a stationary tubular cage and an external cylindrical flow collar slidable along the side wall of the cage, the cage side wall forming an internal bore aligned with the outlet bore and having a ported portion between its ends formed with one or more flow ports, the external flow collar being located for movement between a closed position wherein the one or more flow ports are fully covered by the external flow collar and an open position wherein each of the flow ports is fully or partially uncovered by the external flow collar, whereby fluid may enter the valve through the inlet bore, pass through the one or more flow ports at reduced pressure and continue through the outlet bore; a bonnet disengagably connected with, and closing, an upper end of the valve body; and a stem for biasing the external sleeve over the flow ports, the method comprising: forming the tubular cage such that at least the ported portion includes a tubular outer cage member and a tubular inner cage member, the inner cage member and the outer cage member being formed from a tungsten carbide material, being adapted to be concentrically aligned, and having a length to span at least the ported portion; andjoining the inner cage member and the outer cage member concentrically together by bonding at an interface formed between the inner cage member and the outer cage member. 22. The method of claim 21, wherein the interface is filled with a ductile bonding material. 23. The method of claim 22, wherein the ductile bonding material is a solder, brazing or cement material. 24. The method of claim 22, wherein the ductile bonding material is a solder or brazing material.
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