CN106969165A - 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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- CN106969165A CN106969165A CN201710319850.1A CN201710319850A CN106969165A CN 106969165 A CN106969165 A CN 106969165A CN 201710319850 A CN201710319850 A CN 201710319850A CN 106969165 A CN106969165 A CN 106969165A
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- valve port
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- 238000003466 welding Methods 0.000 claims abstract description 49
- 230000007704 transition Effects 0.000 claims abstract description 12
- 229910000679 solder Inorganic materials 0.000 claims abstract description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 18
- 229910052786 argon Inorganic materials 0.000 claims description 10
- 238000007689 inspection Methods 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- 230000006378 damage Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229920002493 poly(chlorotrifluoroethylene) Polymers 0.000 description 1
- 239000005023 polychlorotrifluoroethylene (PCTFE) polymer Substances 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- 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
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Valve Housings (AREA)
Abstract
A kind of standard attachment structure, 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, provided with a undergauge transition hypotenuse 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, it is solder in butt welding structure, groove that valve port is with sleeve.Valve pressure grade is reduced to 150LB by 800LB in the present invention, and integrated engineering cost reduces by more than 20%, and valve is connected with sleeve using butt welding, results in more preferable welding structure, and the continuous stress of its weld seam is good, and weldquality easily ensures.
Description
Technical field
The present invention relates to the standard attachment structure of a kind of small-aperture ball valve, stop valve, it is mainly used in natural gas row
Industry is small-bore, in low-pressure grade cryogenic pipe, belongs to pipeline welding technical field.
Background technology
In Gas Industry, there is substantial amounts of ball valve, stop valve, 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 be damaged 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 is connected reliable with pipeline requirement.
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 is often leaked 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 is typically connected using socket weld.This structure generally uses to ensure bonding strength
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.
If sleeve and valve end are too thin, easily burnt during welding, connecting portion low intensity.
The content of the invention
For above-mentioned the deficiencies in the prior art, it is an object of the invention to provide a kind of small-aperture ball valve, the valve of stop valve
Door welding connection structure, more preferable welding structure can be obtained using the present invention, reduce construction costs.
According to the present invention, there is provided a kind of standard attachment structure：It is including 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, 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 and sleeve wall thickness adaptation (equal or roughly equal), valve
It is solder in butt welding structure, groove that port is with sleeve.
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 thickness 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, differs 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 be 2.87 ± 0.3mm；External diameter 33.4mm pipe, sleeve wall thickness is 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 is 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, and gap width is 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 present invention, sleeve wall thickness grade is improved to Sch40S, to control end wall thickness in more than 2.5mm, it is easy to weld
Connect and examine, improve the reliability of weld seam.
In the present invention, the selection of valve and sleeve is as shown in table 1：
The valve of table 1 and sleeve selection
In the present invention, the end size of valve and sleeve is as shown in table 2：
The valve of table 2 and sleeve end size
Method is welded to connect invention additionally provides a kind of valve and sleeve, this method comprises the following steps：
1) wall thickness of design 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, edge and the edge designs of sleeve in the valve port to be welded together
Groove, is provided with a undergauge transition hypotenuse so that the valve end of junction in the tube wall inner edge for the valve port being connected with sleeve
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.Welding current general control is in 50~230A, preferably 70~120A, and 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) in, the angle of further preferred hypotenuse and valve port center line is 5-30 °, preferably 10-
20 °, more preferably from about 15 °.
Preferably, step 1) in, 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, or groove is a bar crack structure, and gap width is 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 grades, and wherein valve is used with sleeve
Butt welding is connected, described small-bore to refer to DN≤2 ".
In the present invention, valve pressure grade uses 150LB, and sleeve design pressure is not less than valve pressure grade.It is preferred that
Using argon tungsten-arc welding, purity of argon is 99.99%, single welding, double-faced forming.
In the present invention, the control of welding current is as shown in table 3：
The control of the welding current of table 3
In the present invention, usual ball seat material is PCTFE or PTFE, and this material can be damaged more than 200 DEG C,
Live directly welding valve can make valve seat damage, therefore, need to be welded in manufactory at valve two ends after sleeve, valve to scene,
The welding of sleeve and pipeline is completed again, it is to avoid the high temperature failure valve seat produced during Site Welding.
In the present invention, pipeline illustrates as shown in table 4：
The pipeline explanation of table 4
Compared with prior art, the device have the advantages that：
1st, using the present invention standard attachment structure and be welded to connect method, valve pressure grade is reduced to by 800LB
150LB, integrated engineering cost reduction by more than 20%.
2nd, the present invention in valve be connected with sleeve using butt welding, result in more preferable welding structure, its weld seam continuously by
Power is good, and weldquality easily ensures；
3rd, argon tungsten-arc welding, single welding, double-faced forming can be used in the present invention；
4th, using the present invention standard attachment structure and be welded to connect method, postwelding can carry out 100% ray spy
Triage is looked into, and can find weld seam internal flaw, improves soldering reliability.
Brief description of the drawings
Fig. 1 is prior art socket weld standard attachment structure figure；
Fig. 2 is butt welding standard attachment structure figure of the invention；
Fig. 3 is butt welding slope type schematic diagram when half sleeve thickness of pipe wall of the present invention is 2.5~3mm；
Fig. 4 is butt welding slope type schematic diagram when half sleeve thickness of pipe wall of the present invention 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 present invention is further illustrated by embodiment below in conjunction with accompanying drawing.
As shown in Fig. 2 a kind of standard attachment structure：It is including 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 is equal, and it is solder in butt welding structure, groove 4 that valve port is with sleeve.
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 thickness 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 is 2.87 ± 0.3mm；External diameter 33.4mm pipe, sleeve wall thickness is 3.38 ± 0.3mm；External diameter
48.3mm pipe, sleeve wall thickness be 3.68 ± 0.3mm；External diameter 60.3mm pipe, sleeve wall thickness is 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
One sector portion of the edge formation of pipe, 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 of thickness~1/5), preferably 0-1mm, width b can be 0-1.0mm, preferably such as 0.3-1.0mm, 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 present invention, sleeve wall thickness grade is improved to Sch40S, to control end wall thickness in more than 2.5mm, it is easy to weld
Connect 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 of design valve port is 3.1-
5.5mm, the wall thickness of sleeve is 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 and sleeve are welded together.
Preferably, in step 1) in, the angle of hypotenuse 9 and valve port center line is 5-30 °, preferably 10-20 °, more excellent
About 15 ° of choosing.
Welding current general control is in 50~230A, preferably 70~120A, and 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.This method is mainly used in the small-bore cryogenic pipe that design pressure is 150LB grades, 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 is 1.5 times of valve pressure grade.
Experiment proves that, using the standard attachment structure of the present invention, valve pressure grade is reduced to 150LB by 800LB, whole
Body construction costs reduction 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, the wall ratio sleeve of valve port
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 it is solder in butt welding structure, groove that valve port is with sleeve.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 results in 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 it is solder in butt welding structure, groove that valve port is with sleeve.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 results in 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 is changed to reduce investment outlay after 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.Economic benefit of the present invention shows as can be seen here
Write.
Claims (11)
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 is 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, valve port is butt welding structure with sleeve,
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 °, is further 10-20 °.
3. 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 is wall thickness or sleeve in 2.77-3.91mm, and the wall ratio ASME B16.34 standards of valve port
Wall thickness wants big 0.6-1.3mm.
4. the standard attachment structure according to any one of claim 1-3, it is characterised in that groove is by be welded
One sector portion of the edge formation at the edge and sleeve of the valve port being connected together, the angle of the sector portion is 60-
85°。
5. 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.
6. the standard attachment structure according to any one of claim 1-3, it is characterised in that groove is a bar seam
Structure, gap width is 0-0.5mm.
7. the standard attachment structure according to any one of claim 1-3, it is characterised in that valve is small-bore ball
Valve or stop valve.
8. a kind of valve is welded to connect method with sleeve, this method comprises the following steps：
1) wall thickness of design valve port is 3.1-5.5mm, and the wall thickness of sleeve is 2.77-3.91mm, and the wall thickness of valve port
Than the big 0.6-1.3mm of wall thickness of sleeve, edge and the edge designs groove of sleeve in the valve port to be welded together,
A undergauge transition hypotenuse is provided with the tube wall inner edge for the valve port being connected with sleeve so that the wall of the valve port of junction
Thickness is adapted to sleeve wall thickness；
2) butt welding mode is used, by argon arc welding, single welding, double-faced forming method, valve port and sleeve are welded together.
9. valve according to claim 8 is welded to connect method with sleeve, it is characterised in that in step 1) in, undergauge mistake
The angle for crossing hypotenuse and valve port center line is 5-30 °, preferably 10-20 °.
10. valve according to claim 8 and sleeve are welded to connect method, it is characterised in that step 1) in, groove be by
One sector portion of the edge formation at the edge and sleeve of the valve port to be welded together, the angle of the sector portion
For 60-85 °, more preferably 75 ± 5 °, or groove is a bar crack structure, gap width is 0-0.5mm.
11. valve according to claim 8 is welded to connect method with sleeve, it is characterised in that this method also includes following
Step：
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.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710319850.1A CN106969165A (en) | 2017-05-09 | 2017-05-09 | The standard attachment structure of small-aperture ball valve, stop valve |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710319850.1A CN106969165A (en) | 2017-05-09 | 2017-05-09 | The standard attachment structure of small-aperture ball valve, stop valve |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113210810A (en) * | 2021-05-14 | 2021-08-06 | 北京世源希达工程技术有限公司 | Secondary stainless steel pipe welding inert gas protection device and protection method |
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