GB2335022A - A cryogenic valve - Google Patents
A cryogenic valve Download PDFInfo
- Publication number
- GB2335022A GB2335022A GB9804356A GB9804356A GB2335022A GB 2335022 A GB2335022 A GB 2335022A GB 9804356 A GB9804356 A GB 9804356A GB 9804356 A GB9804356 A GB 9804356A GB 2335022 A GB2335022 A GB 2335022A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- stainless steel
- cryogenic
- sleeve
- valve body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 22
- 239000010935 stainless steel Substances 0.000 claims abstract description 22
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000004411 aluminium Substances 0.000 claims abstract description 16
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 16
- 238000007731 hot pressing Methods 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 description 3
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229940037003 alum Drugs 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K51/00—Other details not peculiar to particular types of valves or cut-off apparatus
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
Abstract
A cryogenic valve comprises a valve body 10 having an inlet 11 and an outlet 12 and a valve seat 13 in the valve body. A valve plug 14 is co-operable with the valve seat for closing the valve, and an elongate valve operating stem 15 is attached to the valve plug. An elongate bonnet tube 16 is secured to the valve body surrounding the valve stem. The bonnet tube is formed of stainless steel and the valve body is formed predominantly of aluminium and has a stainless steel sleeve 17 which has been bonded to the aluminium by hot pressing, the elongate bonnet tube is secured to the stainless steel sleeve.
Description
2335022 A CRYOGENIC VALVE This invention relates to a cryogenic valve.
Cryogenic valves are typically used in cryogenic hydrocarbon plant and have special design considerations. The valve body is enclosed within a "cold box" which is sealed and purged or vacuum insulated. In order to suit the installation position of the valve and to ensure that the valve does not ice up at a position from which it is operated, the valve includes an elongate operating stem enclosed within an extended bonnet tube. Maintenance must be undertaken from the end of the bonnet tube remote from the valve body and designs which permit full replacement of the wear components, particularly the valve plug stem and seat, have particular advantages.
In order to cope with working temperatures as low as 51 Kelvin, the valve body and connecting pipework are manufactured in aluminium. However, in order to limit heat transfer by conduction, the wall thickness of the extended bonnet tube has to be a minimum consistent with the pressure and strength requirements of the valve. In addition, in order to improve still further the valve thermal efficiency, the material of the bonnet tube is normally stainless steel. This necessitates the use of a high performance joint between the two dissimilar materials.
It is common practice to use bolted or screwed gasket joints between the aluminium valve body and the stainless steel bonnet tube. These joints are, however, vulnerable to leakage due to thermal changes and fixing stresses.
The present invention seeks to provide a cryogenic valve which overcomes this drawback.
1 10 According to the present invention there is provided a cryogenic valve comprising a valve body having an inlet and an outlet, a valve seat in the valve body, a valve plug co-operable with the valve seat for closing the valve, an elongate valve operating stem attached to the valve plug and an elongate bonnet tube secured to the valve body and surrounding the valve stem, the bonnet tube being formed of stainless steel and the valve body being formed predominantly of aluminium and having a stainless steel sleeve which has been bonded to the aluminium by hot pressing, the elongate bonnet tube being secured to the stainless steel sleeve.
It has been found that the bonded joint between the stainless steel sleeve and the aluminium provides the pressure integrity and strength bearing characteristics of a welded assembly but without the distortion and joining difficulties.
Preferably, the sleeve has been hot press bonded to an aluminium collar integral with the valve body. In this case, the collar is preferably coaxial with the valve seat. Also, in this case, the sleeve preferably includes a portion which extends within, and more preferably, over substantially the entire length, of the collar. This sleeve portion is advantageously flush with an adjoining portion of the valve body.
Preferably, the stainless steel bonnet tube is welded to the stainless steel sleeve.
The invention will now be more particularly described, by way of example, with reference to the accompanying drawings in which:
Figure 1 is a sectional view of one embodiment of a cryogenic valve according to the invention, and Figure 2 is an enlarged fragmentary view showing the bonded joint between the aluminium part of the valve body and the stainless steel sleeve.
Referring to Figure 1 of the drawings, the cryogenic valve shown therein comprises a valve body 10 having an inlet 11 (or 12) and an outlet 12 (or 11), a valve seat 13, a valve plug 14 co-operable with the valve seat 13 for closing the valve, an elongate valve operating stem 15 secured to the valve plug 14 and an elongate bonnet tube 16 secured to the valve body 10 and surrounding the valve stem 15.
The valve body 10 is formed predominantly of aluminium but includes a stainless steel sleeve 17. The sleeve 17 is bonded to the aluminium by hot pressing typically at a temperature typically in excess of 1500C and a pressure typically in excess of 5 tome. The hot pressing technique causes metallic diffusion of the two materials to a depth of a few microns.
-4 As shown in the drawings, the sleeve 17 is hot press bonded to an aluminium collar 18 on the valve body 10. The collar 18 is coaxial with the valve seat 13 and the sleeve 17 includes a portion 17a which extends within and, preferably, as shown, over the entire length or substantially the entire length of the collar 18.
The collar 18 has an internal diameter which is greater than the internal diameter of an adjoining portion of the aluminium body so that the sleeve portion 17a can be flush with the adjoining portion of the aluminium body.
The sleeve portion 17a enhances the strength of the bonded joint and also serves as a guide for the valve plug 14 in a region close to the throttling area of the valve. This limits the amount of vibration, noise and mechanical damage which could result from fluid throttling.
As shown in Figure 2 of the drawings, the collar 18 has a convex end portion 18a which is received in an annular groove 17b of concave crosssection in the sleeve 17. The collar 18 also has an annular groove 18b which receives an annular projection 17c of barb-shaped cross-section on the sleeve 17.
The joint between the alum part of the valve body 10 and the stainless steel sleeve 17 is robust, leak-tight and reliable.
The bonnet tube 16 is welded to the sleeve 17.
The valve plug 14 comprises a plug stem 14a which is secured to the valve -5stem 15 such as by welding and which includes a portion which cooperates with the sleeve portion 17a to guide the valve plug 14, a plug head 14b which co-operates with the valve seat 13 and a soft seal 14c. The plug stem 14a and plug head 14b are typically formed of stainless steel.
The valve stem 15 and the valve seat 13 are also typically formed of stainless steel.
The rigidity of the joint between the aluminium part of the body 10 and the stainless steel sleeve 17 allows a valve to be constructed in which the radial clearance between the valve stem 15 and the bonnet tube 16 can be minimised to limit heat transfer by convection.
The lack of any flanges on the valve body and valve stem, necessary hitherto in order to permit bolt and gasket joints between the valve body and valve stem, also helps limit heat transfer by conduction.
The valve stem 15 is supported at its upper end in a guide 20 and is connected to an actuator (not shown) in conventional manner.
The valve described above is internally profiled to allow removal of the valve stem 15 and the valve plug 14, and also the valve seat 13, through the bonnet - tube 16 for maintenance or replacement, without the need to remove the valve from the "cold box".
The valve shown in the drawings is a globe valve, but the invention is equally applicable to valves having bodies of other shapes.
Claims (8)
1. A cryogenic valve comprising a valve body having an inlet and an outlet, a valve seat in the valve body, a valve plug co-operable with the valve seat for closing the valve, an elongate valve operating stem attached to the valve plug and an elongate bonnet tube secured to the valve body and surrounding the valve stem, the bonnet tube being formed of stainless steel and the valve body being formed predominantly of aluminium and having a stainless steel sleeve which has been bonded to the aluminium by hot pressing, the elongate bonnet tube being secured to the stainless steel sleeve.
2. A cryogenic valve as claimed in claim 1, wherein the sleeve has been hot press bonded to an aluminium collar integral with the valve body.
3. A cryogenic valve as claimed in claim 2, wherein the collar is coaxial with the valve seat.
4. A cryogenic valve as claimed in claim 2 or claim 3, wherein the sleeve includes a portion which extends within the collar.
5. A cryogenic valve as claimed in claim 4, wherein the said sleeve extends over substantially the entire length of the collar.
6. A cryogenic valve as claimed in claim 4 or claim 5, wherein said sleeve is -8flush with an adjoining portion of the valve body.
7. A cryogenic valve as claimed in any one of the preceding claims, wherein the stainless steel bonnet tube is welded to the stainless steel sleeve.
8. A cryogenic valve substantially as hereinbefore described with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9804356A GB2335022B (en) | 1998-03-03 | 1998-03-03 | A cryogenic valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9804356A GB2335022B (en) | 1998-03-03 | 1998-03-03 | A cryogenic valve |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9804356D0 GB9804356D0 (en) | 1998-04-22 |
| GB2335022A true GB2335022A (en) | 1999-09-08 |
| GB2335022B GB2335022B (en) | 2002-03-13 |
Family
ID=10827818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9804356A Expired - Lifetime GB2335022B (en) | 1998-03-03 | 1998-03-03 | A cryogenic valve |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2335022B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2389881A (en) * | 2002-06-21 | 2003-12-24 | Sev Glocon Ltd | A coupling |
| RU2689492C1 (en) * | 2015-11-10 | 2019-05-28 | Л'Эр Ликид, Сосьете Аноним Пур Л'Этюд Э Л'Эксплуатасьон Де Проседе Жорж Клод | Valve adaptation with press fit for valve with upper connector in cryogenic equipment |
-
1998
- 1998-03-03 GB GB9804356A patent/GB2335022B/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2389881A (en) * | 2002-06-21 | 2003-12-24 | Sev Glocon Ltd | A coupling |
| RU2689492C1 (en) * | 2015-11-10 | 2019-05-28 | Л'Эр Ликид, Сосьете Аноним Пур Л'Этюд Э Л'Эксплуатасьон Де Проседе Жорж Клод | Valve adaptation with press fit for valve with upper connector in cryogenic equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2335022B (en) | 2002-03-13 |
| GB9804356D0 (en) | 1998-04-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PE20 | Patent expired after termination of 20 years |
Expiry date: 20180302 |