IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0199078
(2008-08-27)
|
등록번호 |
US-8371333
(2013-02-12)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
인용정보 |
피인용 횟수 :
9 인용 특허 :
9 |
초록
▼
A cage valve for reduced erosion at the outlet bore. The valve is of the type having flow trim arranged transverse to the inlet bore and aligned with the outlet bore, the flow trim including a stationary tubular cage and an external cylindrical flow collar slidable along the side wall of the cage to
A cage valve for reduced erosion at the outlet bore. The valve is of the type having flow trim arranged transverse to the inlet bore and aligned with the outlet bore, the flow trim 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 pairs of main flow ports in the cage side wall. The external flow collar is located for movement between a fully closed position wherein each of the main flow ports is fully covered by the external flow collar and a fully open position wherein each of the main flow ports remains partially covered by the external flow collar such that fluid flow from the inlet through each of the main flow ports is directed angularly into the external flow collar, away from the outlet bore, to reduce erosion at the outlet bore.
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, open-ended tubular cage and an external cylindrical flow collar slidable along the outer side wall of the cage, the external flow collar forming a bore and being closed at an upstream end to form a flow collar chamber in the bore of the external flow collar, the cage side wall forming an internal bore aligned with the outlet bore and at least a pair of diametrically opposed main flow ports, whereby fluid enters the valve through the inlet bore, passes through the main flow ports at reduced pressure and continues 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 main flow ports; andthe external flow collar being located within the main bore for limited movement between a fully closed position wherein each of the main flow ports is fully covered by the external flow collar and a fully open position wherein each of the main flow ports remains partially covered by the external flow collar with between about 5% and 15% of the diameter of each of the main flow ports at an upper part of the main flow ports remaining covered in the fully open position, such that fluid flow from the inlet bore through each of the main flow ports is directed angularly into the flow collar chamber of the external flow collar away from the outlet bore to reduce erosion at the outlet bore without reducing the flow capacity of the valve in the fully open position. 2. The valve of claim 1, wherein between about 8% and 12% of the diameter of each of the main flow ports remains covered by the external flow collar in the fully open position. 3. The valve of claim 1, wherein between about 9% and 10% of the diameter of each of the main flow ports remains covered by the external flow collar in the fully open position. 4. The valve of claim 1, wherein there are 1, 2 or 3 pairs of diametrically opposed main flow ports circumferentially spaced such that their midpoints are circumferentially aligned on the cage, and located such that they overlap an intersection of the centre axes of the inlet bore and the outlet bore. 5. The valve of claim 4, wherein there is one pair of diametrically opposed main flow ports. 6. The valve of claim 4, 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. 7. The valve of claim 6, wherein the at least one side port is aligned with the inlet bore, and wherein one pair of the diametrically opposed main flow ports has an axis through their midpoints that is parallel to the centre axis of the inlet bore. 8. The valve of claim 7, 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. a tubular cartridge having a side wall forming an internal bore and at least one side port communicating with the body side inlet, whereby fluid enters through the at least one side port from the body side inlet;ii. the flow trim 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 outer side wall of the cage, the cage side wall forming the pair 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 directly with the at least one 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 disengagably connected with, and closing, the upper end of the tubular cartridge and the body;iv. the stem for biasing the flow collar over the main flow ports; andv. the external flow collar being located within the tubular cartridge for limited movement between a fully closed position wherein each of the main flow ports is fully covered by the external flow collar and a fully open position wherein each of the main flow ports remains partially covered by the external flow collar with between about 5% and 15% of the diameter of each of the main flow ports at an upper part of the main flow ports remaining covered in the fully open position, such that fluid flow from the body side inlet through each of the main flow ports is directed angularly into the flow collar chamber of the external flow collar away from the body outlet to reduce erosion at the outlet bore without reducing the flow capacity of the valve in the fully open position. 9. The valve of claim 7, 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 that 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 the main flow ports and closer to the body outlet than are the main flow ports. 10. The valve of claim 9, further comprising: protuberances extending inwardly into the internal bore of the tubular sleeve or cartridge from the side wall of the tubular sleeve or cartridge and being aligned with one or both of the main and secondary flow ports, so that fluid moving through an annulus formed between the flow trim and the tubular sleeve or cartridge is deflected inwardly by the protuberances to enter the cage through main flow ports. 11. The valve of claim 9, comprising only one pair of main flow ports sized to accommodate at least about 80% of the fluid flow from the inlet, and only one pair of secondary flow ports. 12. The valve of claim 1 wherein, to limit the movement of the external flow collar such that each of the main flow ports remains partially covered by the flow collar in the fully open position, the valve includes one or more of the following arrangements: i) each of the main flow ports being located or sized on the cage such that each of the main flow ports remains partially covered by the flow collar in the fully open position;ii) the cage being located relative to the external flow collar such that each of the main flow ports remains partially covered in the fully open position;iii) the external flow collar being located or sized relative to the cage and each of the main flow ports such that each of the main flow ports remains partially covered in the fully open position; andiv) a stop mechanism to limit the travel of the stem and the external flow collar such that each of the main flow ports remains partially covered in the fully open position. 13. The flow trim of claim 12. 14. A method of reducing erosion 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 providing a stationary tubular cage and an external flow collar slidable along the side wall of the cage, the cage side wall forming an internal bore aligned with the outlet bore and at least a pair of diametrically opposed main flow ports, whereby fluid enters the valve through the inlet bore, passes through the main flow ports at reduced pressure, and continues 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 main flow ports, the method comprising: configuring the flow trim such that the tubular cage is open-ended and the external flow collar slides along the outer side wall at an upstream end of the tubular cage, the external flow collar forming a bore and being closed at its upstream end to form a flow collar chamber in the bore of the external flow collar; andlocating the external flow collar within the main bore for limited movement between a fully closed position wherein each of the main flow ports is fully covered by the external flow collar and a fully open position wherein each of the main flow ports remains partially covered by the external flow collar with between about 5% and 15% of the diameter of each of the main flow ports at an upper part of the main flow ports remaining covered in the fully open position, such that fluid flow from the inlet bore through each of the main flow ports is directed angularly into the flow collar chamber of the external flow collar away from the outlet bore to reduce erosion at the outlet bore without reducing the flow capacity of the valve in the fully open position.
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