CN206830855U - The standard attachment structure of small-aperture ball valve, stop valve - Google Patents
The standard attachment structure of small-aperture ball valve, stop valve Download PDFInfo
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- CN206830855U CN206830855U CN201720504876.9U CN201720504876U CN206830855U CN 206830855 U CN206830855 U CN 206830855U CN 201720504876 U CN201720504876 U CN 201720504876U CN 206830855 U CN206830855 U CN 206830855U
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Abstract
A kind of standard attachment structure of small-aperture ball valve, stop valve, it includes valve body, valve seat, spheroid in valve body, the valve rod and bonnet being connected with valve body, the sleeve being connected with the valve port of valve body, sleeve is connected with valve port, the valve port and the connection end of sleeve are provided with groove, a undergauge transition hypotenuse is provided with before valve port, valve port inner diameter is less than sleeve internal diameter, and valve port inner diameter meets API6D regulation, and the wall thickness of valve port is more than sleeve wall thickness, valve port is butt welding structure with sleeve, is solder in groove.Valve pressure grade is reduced to 150LB by 800LB in the utility model, and integrated engineering cost reduces by more than 20%, and valve is connected with sleeve using butt welding, can obtain more preferable welding structure, and the continuous stress of its weld seam is good, and weldquality easily ensures.
Description
Technical field
The standard attachment structure of a kind of small-aperture ball valve, stop valve is the utility model is related to, it is mainly used in naturally
Gas industry is small-bore, in low-pressure grade cryogenic pipe, belongs to pipeline welding technical field.
Background technology
In Gas Industry, substantial amounts of ball valve, stop valve be present, because the sealing grade of its soft seal is high, can accomplish
Zero leakage, so this kind of flexible sealing valve is widely used in Gas Industry.Soft sealing material can damage more than 200 DEG C,
Live directly welding valve can make valve seat damage.Therefore, this kind of valve just need to usually weld sleeve in manufactory, to scene
Afterwards again with pipeline welding, high temperature when so welding is not transferred to soft sealing material.This kind of valve working inclement condition, often
With inflammable and explosive medium, the working environment of -162 DEG C of low temperature, so valve requires that connection is reliable with pipeline.
In conventional project, the connection of this small-aperture ball valve, stop valve and sleeve typically uses following two patterns：
1st, connected using flange, this structure valve particularly Subzero valve often leaks in sealing surface；
2nd, (as shown in Figure 1) is connected using socket weld, in specification HG/T20646.5《Chemical plant installations pipeline material technology is advised
It is fixed》Middle regulation, the pipeline of this bore are typically connected using socket weld.This structure is to ensure bonding strength, generally use
CL800LB ball valves, the cost of valve is high, and is angle welding, and weld seam is difficult to film making or ultrasonic examination, can only do magnetic or infiltration
Flaw detection, it is impossible to find weld seam internal flaw, weldquality is difficult to ensure that, while angle welding makes weld seam discontinuous, forms stress collection
Middle destruction.
Easily burnt if sleeve and valve end are too thin, during welding, connecting portion low intensity.
Utility model content
For above-mentioned the deficiencies in the prior art, the purpose of this utility model is to provide a kind of small-aperture ball valve, stop valve
Standard attachment structure, more preferable welding structure can be obtained using the utility model, reduce construction costs.
According to the utility model, there is provided a kind of standard attachment structure：It includes valve body, valve seat in valve body,
Spheroid, the valve rod and bonnet being connected with valve body, the sleeve being connected with the valve port of valve body,
Sleeve is connected with valve port, and the connection end of the valve port and sleeve is provided with groove, valve port inner diameter
Less than sleeve internal diameter, the wall thickness of valve port is more than sleeve wall thickness, and the tube wall inner edge for the valve port being connected with sleeve is provided with one
Bar undergauge transition hypotenuse so that the wall thickness of the valve port of junction is adapted to (equal or roughly equal) with sleeve wall thickness, valve
Port is butt welding structure with sleeve, is solder in groove.
Preferably, the angle of undergauge transition hypotenuse and valve port center line is 5-30 °, preferably 10-20 °, more preferably from about
15°。
Preferably, the wall thickness of valve port is 3.1-5.5mm, and the wall thickness of sleeve is 2.77-3.91mm.The wall of valve port
Wall thickness in thickness rate standard (ASME B16.34) wants thick 0.6-1.3mm.
Preferably, valve port inner diameter is less than sleeve internal diameter, differs 2.76-3.48mm；The wall thickness of valve port is more than sleeve
Thickness of pipe wall, differ 0.6-1.3mm.For example, for external diameter 21.3mm pipe, sleeve wall thickness is 2.77 ± 0.3mm；External diameter 26.7mm
Pipe, sleeve wall thickness is 2.87 ± 0.3mm；External diameter 33.4mm pipe, sleeve wall thickness are 3.38 ± 0.3mm；External diameter 48.3mm's
Pipe, sleeve wall thickness is 3.68 ± 0.3mm；External diameter 60.3mm pipe, sleeve wall thickness are 3.91 ± 0.3mm.
In one embodiment, groove is the edge shape of edge by the valve port to be welded together and sleeve
Into a sector portion, the angle (α angles) of the sector portion is 60-85 °, more preferably 75 ± 5 °.The edge of valve port with
The edge of sleeve is in cone-shaped or truncated cone.
Further, there is one section of clearance portion (can also be not provided with clearance portion) in the lower section of groove, the height of clearance portion can
To be 0-1.3mm (account for pipe thickness 1/3~1/5), preferably 0-1mm, width can be 0-1.0mm, such as 0.3-1.0mm,
It is preferred that 0-0.5mm.
The embodiment is suitable for 3-6mm pipe thicknesses (sleeve wall thickness).
In another embodiment, groove is a bar crack structure, gap width 0-0.5mm.The embodiment is fitted
Together in 2.5-3mmm pipe thicknesses (sleeve wall thickness).
Preferably, sleeve material and valve body material are same or like.
Preferably, the material of sleeve and valve body is austenitic stainless steel.
In the utility model, sleeve wall thickness grade is improved to Sch40S, to control end wall thickness in more than 2.5mm, easily
In welding and examine, improve the reliability of weld seam.
In the utility model, the selection of valve and sleeve is as shown in table 1：
The valve of table 1 and sleeve selection
In the utility model, the end size of valve and sleeve is as shown in table 2：
The valve of table 2 and sleeve end size
The utility model is additionally provided with a kind of valve and is welded to connect method with sleeve, and this method comprises the following steps：
1) wall thickness for designing valve port is 3.1-5.5mm, and the wall thickness of sleeve is 2.77-3.91mm, and valve port
The big 0.6-1.3mm of wall thickness of wall ratio sleeve, at the edge of valve port and the edge designs of sleeve to be welded together
Groove, it is provided with a undergauge transition hypotenuse in the tube wall inner edge for the valve port being connected with sleeve so that the valve end of junction
The wall thickness of mouth is adapted to sleeve wall thickness；2) butt welding mode is used, by argon arc welding, single welding, double-faced forming method, by valve end
Mouth welds together with sleeve.For welding current general control in 50~230A, preferably 70~120A, speed of welding can be 150-
210mm/min, electrode diameter can be 1.8-2.5mm, and front protecting gas is argon gas and hydrogen, backing gas are argon
Gas, electric arc height can be 1.5-2mm.
Preferably, in step 1), the angle of further preferred hypotenuse and valve port center line is 5-30 °, preferably 10-
20 °, more preferably from about 15 °.
Preferably, in step 1), groove is the edge shape at the edge and sleeve by the valve port to be welded together
Into a sector portion, the angle (α angles) of the sector portion is 60-85 °, more preferably 75 ± 5 °.The edge of valve port with
The edge of sleeve is in cone-shaped or truncated cone, or groove is a bar crack structure, gap width 0-0.5mm.
Preferably, this method is further comprising the steps of：
3) postwelding carries out 100% radiographic inspection inspection；
4) valve integrally carries out solution treated with sleeve；
5) valve integrally carries out pressure test with sleeve, and test pressure is 1.5 times of valve pressure grade.
This method is mainly used in the small-bore cryogenic pipe that design pressure is 150LB levels, and wherein valve uses with sleeve
Butt welding connects, described small-bore to refer to DN≤2 ".
In the utility model, valve pressure grade uses 150LB, and sleeve design pressure is not less than valve pressure grade.
It is preferred that use argon tungsten-arc welding, purity of argon 99.99%, single welding, double-faced forming.
In the utility model, the control of welding current is as shown in table 3：
The control of the welding current of table 3
In the utility model, usual ball seat material is PCTFE or PTFE, and this material can damage more than 200 DEG C
Bad, directly welding valve can make valve seat damage at the scene, therefore, sleeve need to be welded at valve both ends in manufactory, valve is to now
After, then the welding of sleeve and pipeline is completed, avoid high temperature failure valve seat caused by Site Welding.
In the utility model, pipeline illustrates as shown in table 4：
The pipeline explanation of table 4
Compared with prior art, the utility model has the advantage that：
1st, using standard attachment structure of the present utility model and method is welded to connect, valve pressure grade is by 800LB
150LB is reduced to, integrated engineering cost reduces by more than 20%.
2nd, valve is connected with sleeve using butt welding in the utility model, can obtain more preferable welding structure, and its weld seam connects
Continuous stress is good, and weldquality easily ensures；
3rd, argon tungsten-arc welding, single welding, double-faced forming are used in the utility model；
4th, using standard attachment structure of the present utility model and method is welded to connect, postwelding can carry out 100% and penetrate
Line defect detecting test, weld seam internal flaw can be found, improve soldering reliability.
Brief description of the drawings
Fig. 1 is prior art socket weld standard connection structure diagram；
Fig. 2 is butt welding standard connection structure diagram of the present utility model；
Fig. 3 is butt welding slope type schematic diagram when the utility model half sleeve thickness of pipe wall is 2.5~3mm；
Fig. 4 is butt welding slope type schematic diagram when the utility model half sleeve thickness of pipe wall is 3~5mm.
Reference：1：Valve body；2：Sleeve；3：Valve port；4：Groove；5：Bonnet；6：Valve rod；7：Valve seat；8：Spheroid.
9：Undergauge transition hypotenuse；ФD1：Valve end internal diameter；ФD2：Sleeve internal diameter；S1：Valve port wall thickness；S2：Sleeve wall thickness.
Embodiment
The utility model is further illustrated by embodiment below in conjunction with accompanying drawing.
A kind of as shown in Fig. 2 standard attachment structure：It includes valve body 1, valve seat 7, spheroid 8 in valve body, with
The valve rod 6 and bonnet 5 of valve body connection, the sleeve 2 being connected with the valve port 3 of valve body,
Sleeve 2 is connected with valve port 3, and the valve port 3 and the connection end of sleeve 2 are provided with groove 4, valve port
3 internal diameters (D1) are less than the internal diameter of sleeve 2 (D2), and the wall thickness (S1) of valve port is more than sleeve wall thickness (S2), the valve being connected with sleeve
The tube wall inner edge of door port is provided with a undergauge transition hypotenuse 9 so that the wall thickness and sleeve wall thickness of the valve port of junction are big
Cause equal, valve port and sleeve be butt welding structure, and it is solder that groove 4 is interior.
The angle of hypotenuse 9 and valve port center line is 5-30 °, preferably 10-20 °, more preferably from about 15 °.
The wall thickness of valve port is 3.1-5.5mm, and the wall thickness of sleeve is 2.77-3.91mm.The wall ratio mark of valve port
Wall thickness in accurate (ASME B16.34) wants thick 0.6-1.3mm.
Valve port inner diameter is less than sleeve internal diameter, 2.76~3.48mm of the two difference；The wall thickness of valve port is more than sleeve
Wall thickness, 0.6~1.3mm of the two difference.For example, for external diameter 21.3mm pipe, sleeve wall thickness is 2.77 ± 0.3mm；External diameter
26.7mm pipe, sleeve wall thickness are 2.87 ± 0.3mm；External diameter 33.4mm pipe, sleeve wall thickness are 3.38 ± 0.3mm；External diameter
48.3mm pipe, sleeve wall thickness are 3.68 ± 0.3mm；External diameter 60.3mm pipe, sleeve wall thickness are 3.91 ± 0.3mm.
In one embodiment, as shown in figure 4, groove is by the edge and sleeve of the valve port to be welded together
The sector portion that the edge of pipe is formed, the angle [alpha] of the sector portion is 60-85 °, more preferably 75 ± 5 °.Valve port
The edge of edge and sleeve is in cone-shaped or truncated cone.
Further, there is one section of clearance portion in the lower section of groove, the height a of clearance portion can be that 0-1.3mm (accounts for tube wall
The 1/3~1/5 of thickness), preferably 0-1mm, width b can be 0-1.0mm, such as 0.3-1.0mm, preferably 0-0.5mm.
The embodiment is suitable for 3-6mm pipe thicknesses (wall thickness of valve port and sleeve wall thickness).
In another embodiment, as shown in figure 3, groove is a bar crack structure, gap width c is 0-0.5mm, excellent
Select 0.2-0.5mm.The embodiment is suitable for 2.5-3mmm pipe thicknesses (sleeve wall thickness).
Sleeve material is preferably same or like with valve body material.Preferably, the material of sleeve and valve body is austenite
Stainless steel.
In the utility model, sleeve wall thickness grade is improved to Sch40S, to control end wall thickness in more than 2.5mm, easily
In welding and examine, improve the reliability of weld seam.
The method that is welded to connect of above-mentioned standard attachment structure includes：1) wall thickness for designing valve port is 3.1-
5.5mm, the wall thickness of sleeve are 2.77-3.91mm, and the big 0.6-1.3mm of wall thickness of the wall ratio sleeve of valve port,
The edge of the valve port welded together and the edge designs groove of sleeve, in the tube wall for the valve port being connected with sleeve
Edge is provided with a undergauge transition hypotenuse so that the wall thickness of the valve port of junction is adapted to sleeve wall thickness；2) butt welding side is used
Formula, by argon arc welding, single welding or double-faced forming method, valve port is welded together with sleeve.
Preferably, in step 1), the angle of hypotenuse 9 and valve port center line is 5-30 °, preferably 10-20 °, more excellent
About 15 ° of choosing.
For welding current general control in 50~230A, preferably 70~120A, speed of welding can be 150-210mm/min,
Electrode diameter can be 1.8-2.5mm, and front protecting gas is argon gas and hydrogen, backing gas are argon gas, and electric arc is highly
Can be 1.5-2mm.This method is mainly used in the small-bore cryogenic pipe that design pressure is 150LB levels, and described is small-bore
Refer to DN≤2 ".Preferably, the pressure rating of valve 3 is 150LB.
Preferably, this method is further comprising the steps of：
3) postwelding carries out 100% radiographic inspection inspection；
4) valve port 3 and the overall progress solution treated of sleeve 2；
5) valve port 3 and the overall progress pressure test of sleeve 2, test pressure are 1.5 times of valve pressure grade.
Experiment proves that, using standard attachment structure of the present utility model, valve pressure grade is reduced to by 800LB
150LB, integrated engineering cost reduce by 20%.
Embodiment 1
Two groups of standard attachment structures as shown in Figure 1 are made, it includes valve body 1, valve seat 7, ball in valve body
Body 8, the valve rod 6 and bonnet 5 being connected with valve body, the sleeve 2 being connected with the valve port 3 of valve body, sleeve 2 and valve port 3
External diameter is respectively 21.3mm, 26.7mm, and corresponding sleeve wall thickness is respectively 2.77mm, 2.87mm, and the wall ratio of valve port is tucked inside the sleeve
Thickness of pipe wall distinguishes big 0.6mm, 0.8mm.
Sleeve 2 is connected with the butt welding of valve port 3, and the valve port 3 and the connection end of sleeve 2 are provided with groove 4, groove
4 be structure shown in Fig. 3, and valve port is butt welding structure with sleeve, is solder in groove.The pipe for the valve port being connected with sleeve
Wall inner edge is provided with a undergauge transition hypotenuse 9 so that the wall thickness of the valve port of junction is adapted to sleeve wall thickness, hypotenuse and valve
The angle of door port center line is about 15 °.The present embodiment can obtain more preferable welding structure, and the continuous stress of its weld seam is good, weldering
Seam quality easily ensures.Valve pressure grade is reduced to 150LB by 800LB.
Embodiment 2
Three groups of standard attachment structures as shown in Figure 1 are made, it includes valve body 1, valve seat 7, ball in valve body
Body 8, the valve rod 6 and bonnet 5 being connected with valve body, the sleeve 2 being connected with the valve port 3 of valve body, sleeve 2 and valve port 3
External diameter is respectively 33.4mm, 48.3mm, 60.3mm, and corresponding sleeve wall thickness is respectively 3.38mm, 3.68mm, 3.91mm, valve
The wall ratio sleeve wall thickness of port distinguishes big 0.8mm, 1.0mm and 1.2mm.
Sleeve 2 is connected with the butt welding of valve port 3, and the valve port 3 and the connection end of sleeve 2 are provided with groove 4, groove
4 be structure shown in Fig. 4, and valve port is butt welding structure with sleeve, is solder in groove.Groove includes a sector portion and slope
Clearance portion below mouthful, the angle of sector portion is 75 °.The height of clearance portion is 0.7-1.2mm, and it is 0.4-0.5mm that width, which is,.
The tube wall inner edge for the valve port being connected with sleeve is provided with a undergauge transition hypotenuse 9 so that the wall of the valve port of junction
Thickness is adapted to sleeve wall thickness, and the angle of hypotenuse and valve port center line is about 15 °.The present embodiment can obtain more preferable welding
Structure, the continuous stress of its weld seam is good, and weldquality easily ensures.Valve pressure grade is reduced to 150LB by 800LB.
According to the quotation of domestic several valve plants in 2015,1 " 800LB roof-mounted cryogenic ball valve quotation average out to：
32176 yuan；1 " 150LB roof-mounted cryogenic ball valve quotation average out to：21513 yuan；It can be reduced investment outlay after being changed to 150LB
33%, it is contemplated that a small amount of change (being no more than 10%) and market price change (being no more than 15%) of 150LB valve ends, it is actual
Reduce investment outlay and should be greater than 25%.With the increasing of valve aperture, price differential can also be bigger.The utility model economic benefit as can be seen here
Significantly.
Claims (10)
1. a kind of standard attachment structure, it is characterised in that it includes valve body, valve seat, spheroid in valve body, with valve body
The valve rod and bonnet of connection, the sleeve being connected with the valve port of valve body,
Sleeve is connected with valve port, and the connection end of the valve port and sleeve is provided with groove, and valve port inner diameter is less than
Sleeve internal diameter, the wall thickness of valve port are more than sleeve wall thickness, and the tube wall inner edge for the valve port being connected with sleeve is provided with a contracting
Footpath transition hypotenuse so that the wall thickness of the valve port of junction is adapted to sleeve wall thickness, and valve port and sleeve are butt welding structure,
It is solder in groove.
2. standard attachment structure according to claim 1, it is characterised in that in undergauge transition hypotenuse and valve port
The angle of heart line is 5-30 °.
3. standard attachment structure according to claim 1, it is characterised in that in undergauge transition hypotenuse and valve port
The angle of heart line is 10-20 °.
4. standard attachment structure according to claim 1, it is characterised in that the wall thickness of valve port is 3.1-
5.5mm, the wall thickness of sleeve are 2.77-3.91mm, and wall thickness or sleeve in the wall ratio ASME B16.34 standards of valve port
Wall thickness wants big 0.6-1.3mm.
5. the standard attachment structure according to any one of claim 1-4, it is characterised in that groove is by be welded
The sector portion that the edge for the valve port being connected together and the edge of sleeve are formed, the angle of the sector portion is 60-
85°。
6. standard attachment structure according to claim 5, it is characterised in that the angle of the sector portion be 75 ±
5°。
7. standard attachment structure according to claim 1, it is characterised in that there is an intersegmental gap in the lower section of groove
Portion, the height of clearance portion is 0-1.3mm or accounts for the 1/3~1/5 of pipe thickness, and width is 0.3-1.0mm.
8. the standard attachment structure according to any one of claim 1-4, it is characterised in that groove is that a bar stitches
Structure, gap width 0-0.5mm.
9. the standard attachment structure according to any one of claim 1-4, it is characterised in that the material of sleeve and valve body
Matter is austenitic stainless steel.
10. the standard attachment structure according to any one of claim 1-4, it is characterised in that valve is small-bore
Ball valve or stop valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720504876.9U CN206830855U (en) | 2017-05-09 | 2017-05-09 | The standard attachment structure of small-aperture ball valve, stop valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720504876.9U CN206830855U (en) | 2017-05-09 | 2017-05-09 | The standard attachment structure of small-aperture ball valve, stop valve |
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| CN206830855U true CN206830855U (en) | 2018-01-02 |
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ID=60770478
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106969165A (en) * | 2017-05-09 | 2017-07-21 | 新地能源工程技术有限公司 | The standard attachment structure of small-aperture ball valve, stop valve |
| CN108538412A (en) * | 2018-05-11 | 2018-09-14 | 广东核电合营有限公司 | The valve housing and its processing method of nuclear power plant reactor cooling system |
| CN109058505A (en) * | 2018-10-31 | 2018-12-21 | 天津欧通流体控制设备有限公司 | A kind of wedge-type ultralow temperature top mounting ball valve |
-
2017
- 2017-05-09 CN CN201720504876.9U patent/CN206830855U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106969165A (en) * | 2017-05-09 | 2017-07-21 | 新地能源工程技术有限公司 | The standard attachment structure of small-aperture ball valve, stop valve |
| CN108538412A (en) * | 2018-05-11 | 2018-09-14 | 广东核电合营有限公司 | The valve housing and its processing method of nuclear power plant reactor cooling system |
| CN109058505A (en) * | 2018-10-31 | 2018-12-21 | 天津欧通流体控制设备有限公司 | A kind of wedge-type ultralow temperature top mounting ball valve |
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