CN110608296A - Hemispherical metal sealing fixed ball valve with jacket - Google Patents
Hemispherical metal sealing fixed ball valve with jacket Download PDFInfo
- Publication number
- CN110608296A CN110608296A CN201910857374.8A CN201910857374A CN110608296A CN 110608296 A CN110608296 A CN 110608296A CN 201910857374 A CN201910857374 A CN 201910857374A CN 110608296 A CN110608296 A CN 110608296A
- Authority
- CN
- China
- Prior art keywords
- valve
- jacket
- valve body
- fixed ball
- metal seal
- 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.)
- Pending
Links
- 239000002184 metal Substances 0.000 title claims abstract description 16
- 238000007789 sealing Methods 0.000 title abstract description 17
- 210000004907 gland Anatomy 0.000 claims description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 239000010439 graphite Substances 0.000 claims description 10
- 229910002804 graphite Inorganic materials 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000012530 fluid Substances 0.000 abstract description 15
- 239000012535 impurity Substances 0.000 abstract description 8
- 239000013078 crystal Substances 0.000 abstract description 4
- 238000005299 abrasion Methods 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 238000002425 crystallisation Methods 0.000 description 5
- 230000008025 crystallization Effects 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000000126 substance Substances 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
- F16K27/06—Construction of housing; Use of materials therefor of taps or cocks
- F16K27/067—Construction of housing; Use of materials therefor of taps or cocks with spherical plugs
-
- 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
- F16K41/00—Spindle sealings
- F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
- F16K41/04—Spindle sealings with stuffing-box ; Sealing rings with at least one ring of rubber or like material between spindle and housing
-
- 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
- F16K49/00—Means in or on valves for heating or cooling
- F16K49/005—Circulation means for a separate heat transfer fluid
-
- 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
-
- 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
- F16K5/08—Details
-
- 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
- F16K5/08—Details
- F16K5/14—Special arrangements for separating the sealing faces or for pressing them together
- F16K5/20—Special arrangements for separating the sealing faces or for pressing them together for plugs with spherical surfaces
- F16K5/201—Special arrangements for separating the sealing faces or for pressing them together for plugs with spherical surfaces with the housing or parts of the housing mechanically pressing the seal against the plug
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Taps Or Cocks (AREA)
- Lift Valve (AREA)
Abstract
The invention discloses a hemispheroidal metal seal fixed ball valve with a jacket in the technical field of ball valves, and aims to solve the technical problems that impurities in fluid and crystals of the fluid damage a seal pair and reduce the service life of the valve in the prior art; the valve seat is arranged in the valve cover, a cylindrical spring is arranged between the valve seat and the valve cover, and the valve cover is connected with the valve body; the outer side of the valve body is provided with a jacket, and the heat-conducting medium flows into the jacket from an inlet end arranged on the jacket and flows out of the jacket from an outlet end arranged on the jacket. The operation environment of the valve is improved, the abrasion of impurities in the fluid and crystals of the fluid to a valve sealing pair is avoided, and the service life of the valve is prolonged.
Description
Technical Field
The invention belongs to the technical field of ball valves, and particularly relates to a hemispheroidal metal seal fixed ball valve with a jacket.
Background
The ball valve is widely applied to various fields of petroleum, chemical industry, steel, metallurgy, electric power and the like, and has the advantages of small medium resistance, convenience in operation and the like. However, in the case of transporting materials which are prone to crystallization, such as urea and the like, or viscous fluids, such as petroleum containing wax and asphalt, and the like, the valve seal fails due to the precipitation and crystallization of the materials which generate deposits on the sealing surface. The inevitable part of impurities exist in the fluid, and the impurities in the fluid are easily substituted into the valve core middle cavity in the opening and closing processes of the traditional spherical valve core, so that the sealing pair of the valve can be abraded in the long term, and the service life of the valve is shortened.
Disclosure of Invention
The invention aims to provide a hemispheroidal metal sealing fixed ball valve with a jacket, which aims to solve the technical problems that impurities in fluid and crystals of the fluid damage a sealing pair and reduce the service life of the valve in the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a hemisphere metal seal fixed ball valve with a jacket comprises a valve body, wherein a valve core is arranged in the valve body, a valve rod arranged at the upper part of the valve body drives the valve core to rotate by taking a pivot arranged at the lower part of the valve body as a shaft to realize the opening and closing of the valve, the valve core is shaped like a hemisphere, the spherical surface of the valve core is matched with a valve seat to form seal after the valve is closed, and the aspheric surface side of the valve core and the valve body form a cavity; the valve seat is arranged in the valve cover, a cylindrical spring is arranged between the valve seat and the valve cover, and the valve cover is connected with the valve body; and a jacket is arranged outside the valve body, and a heat-conducting medium flows into the jacket from an inlet end arranged on the jacket and flows out of the jacket from an outlet end arranged on the jacket.
And a gland flange is arranged between the valve rod and the valve body.
And a thrust gasket is arranged between the gland flange and the valve rod.
The jacket is welded on the valve body.
And a graphite gasket I is arranged between the gland flange and the valve body.
And a graphite gasket II is arranged between the pivot and the valve body.
An O-shaped ring I is arranged between the valve seat and the valve cover.
The valve cover is in threaded connection with the valve body.
The heat conducting medium comprises heat conducting oil and water.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the hemispheroidal metal seal fixed ball valve with the jacket, the hemispheroidal valve core and the valve body are adopted to form the cavity, the jacket is arranged to accompany heat to increase the fluidity of fluid, and the crystallization of the fluid is reduced, so that the operating environment of the valve is improved, the abrasion of impurities and crystals of the fluid on a valve seal pair is avoided, and the service life of the valve is prolonged;
(2) according to the semi-sphere metal sealing fixed ball valve with the jacket, the sealing effect of the valve in a high-temperature environment is improved by arranging the graphite gaskets between the gland flange and the valve body and between the pivot and the valve body respectively.
Drawings
FIG. 1 is a schematic longitudinal sectional view of a jacketed hemispherical metal-sealed fixed ball valve in an open state according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a jacketed hemispherical metal-sealed fixed ball valve in the closed position according to an embodiment of the present invention;
in the figure: 1. a valve body; 2. a valve cover; 3. a valve seat; 4. a valve core; 5. a pivot; 6. a valve stem; 7. a gland flange; 8. a cylindrical spring; 9, an O-shaped ring I; 10. a jacket; 11. an inlet end; 12. an outlet end; 13, an O-shaped ring IV; 14. a graphite gasket II; 15. o-shaped ring II; 16. a graphite gasket I; 17, an O-shaped ring III; 18. a thrust washer; 19. a cavity.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
It should be noted that in the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention but do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. As used in the description of the present invention, the terms "front," "back," "left," "right," "up," "down" and "in" refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
As shown in fig. 1 and 2, a valve core 4 is arranged in a valve body 1, the valve core 4 is in a hemispherical shape, a valve rod groove is arranged at the upper part of the valve core 4, a valve rod 6 is inserted into the valve rod groove from the upper part of the valve body 1, a pivot hole is arranged at the lower part of the valve core 4, a pivot 5 is inserted into the pivot hole from the lower part of the valve body 1, and the valve rod 6 drives the valve core 4 to rotate around the pivot 5 to realize the opening and closing of the valve. The valve seat 3 is arranged on one side of the valve body 1, the spherical surface of the valve core 4 is matched with the valve seat 3 to form sealing after the valve is closed, the non-spherical surface side of the valve core 4 and the valve body 1 form a cavity 19, and the hemispherical-single valve seat structure enables the middle cavity of the valve not to be easily brought with impurities, reduces the abrasion of the impurities in the fluid to a sealing pair and prolongs the service life of the valve. The valve seat 3 is installed in the valve cover 2, the valve cover 2 is in threaded connection with the valve body 1, and the threaded connection shortens the installation length of the valve and reduces the weight of the valve. Be equipped with cylindrical spring 8 and O type circle I9 between valve gap 2 and valve body 1, O type circle I9 reinforcing disk seat 3 and the regional sealing performance of valve gap 2, during the installation, will adorn disk seat 3 of cylindrical spring 8 and O type circle I9 and put into the valve gap downthehole, then with the frock with take the screwed valve gap 2 install in valve body 1 and carry out the pretension. Cylindrical spring 8 guarantees the initial sealing of case 4 and disk seat 3, and downstream threaded valve gap 2 can compensate because case 4 and disk seat 3 cooperate the not good valve seal leakage problem that produces, simultaneously along with the extension of operating time, the sealed face of case 4 and disk seat 3 can appear wearing and tearing, and cylindrical spring 8 has a normal pressure all the time to disk seat 3, presses case 4 with disk seat 3 to guarantee sealed effect, extension valve life.
The outer side of the valve body 1 is provided with a jacket 10, the jacket 10 is welded on two sides of the valve body 1 through sealing welding, an inlet end 11 and an outlet end 12 are welded, the jacket 10 can be welded after being manufactured by adopting a seamless steel pipe, and the seamless steel pipe is more pressure-resistant and firmer than a cast material. Heat-conducting media such as heat-conducting oil, water and the like flow into the jacket 10 from the inlet end 11 and flow out of the jacket 10 from the outlet end 12, the valve is maintained in a relatively constant temperature range by the heat-conducting media, the constant temperature of the circulating media inside the valve body 1 is ensured, and meanwhile, fluid crystallization in the valve is avoided, so that the sealing pair is protected from being damaged due to the fluid crystallization, and the service life of the valve is prolonged.
A gland flange 7 is arranged between the valve rod 6 and the valve body 1, a thrust gasket 18 is arranged between the gland flange 7 and the valve rod 6, and the thrust gasket 18 can reduce the friction force between the gland flange 7 and the valve rod 6 and reduce the torque of the valve. An O-shaped ring II 15 is arranged between the gland flange 7 and the valve rod 6, and an O-shaped ring III 17 and a graphite gasket I16 are arranged between the gland flange 7 and the valve body 1; an O-shaped ring IV 13 and a graphite gasket II 14 are arranged between the pivot 5 and the valve body 1. The O-shaped ring has reliable sealing performance, and the graphite gasket is suitable for high-temperature resistant environment and can enhance the sealing performance of the valve at high temperature.
The assembly sequence of this embodiment is: firstly, a valve core 4 is placed in a valve body 1, a valve rod 6 is arranged at the upper part of the valve body 1 and is aligned with a valve rod groove of the valve core 4, a pivot 5 is inserted into the lower part of the valve body 1 and is aligned with a pivot hole of the valve core 4, a gland flange 7 is arranged at the position of the valve rod 6, a valve seat 3 provided with a cylindrical spring 8 and an O-shaped ring I is placed in a valve cover hole, then a valve cover 2 with threads is pre-tightened by a tool, a jacket 10 is welded at two sides of the valve body 1 by seal welding, and an inlet end; when the device is disassembled, the operation is carried out in a reverse order.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A hemisphere metal seal fixed ball valve with a jacket is characterized by comprising a valve body, wherein a valve core is arranged in the valve body, a valve rod arranged at the upper part of the valve body drives the valve core to rotate by taking a pivot arranged at the lower part of the valve body as a shaft to open and close the valve, the valve core is in a hemisphere shape, the spherical surface of the valve core is matched with a valve seat to form seal after the valve is closed, and the aspheric surface side of the valve core and the valve body form a cavity;
the valve seat is arranged in the valve cover, a cylindrical spring is arranged between the valve seat and the valve cover, and the valve cover is connected with the valve body;
and a jacket is arranged outside the valve body, and a heat-conducting medium flows into the jacket from an inlet end arranged on the jacket and flows out of the jacket from an outlet end arranged on the jacket.
2. The jacketed hemispherical metal seal fixed ball valve of claim 1, wherein a gland flange is provided between the valve stem and the valve body.
3. The hemispherical metal seal fixed ball valve with the clamping sleeve as claimed in claim 2, wherein a thrust gasket is arranged between the gland flange and the valve rod.
4. The jacketed hemispherical metal seal retaining ball valve of claim 1, wherein the jacket is welded to the valve body.
5. The jacketed hemispherical metal-sealed fixed ball valve according to claim 1, wherein a graphite gasket i is provided between the gland flange and the valve body.
6. The jacketed hemispherical metal seal fixed ball valve of claim 1, wherein a graphite gasket ii is provided between the pivot and the valve body.
7. The jacketed hemispherical metal seal fixed ball valve according to claim 1, wherein an O-ring i is arranged between the valve seat and the valve cover.
8. The jacketed hemispherical metal seal fixed ball valve of claim 1, wherein the valve cover and the valve body are in threaded connection.
9. The jacketed hemispherical metal seal fixed ball valve according to claim 1, wherein the heat conducting medium comprises heat conducting oil and water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910857374.8A CN110608296A (en) | 2019-09-11 | 2019-09-11 | Hemispherical metal sealing fixed ball valve with jacket |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910857374.8A CN110608296A (en) | 2019-09-11 | 2019-09-11 | Hemispherical metal sealing fixed ball valve with jacket |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110608296A true CN110608296A (en) | 2019-12-24 |
Family
ID=68892549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910857374.8A Pending CN110608296A (en) | 2019-09-11 | 2019-09-11 | Hemispherical metal sealing fixed ball valve with jacket |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110608296A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111561604A (en) * | 2020-05-20 | 2020-08-21 | 王善波 | Valve with constant temperature function |
| CN113154092A (en) * | 2021-04-01 | 2021-07-23 | 浙江上工阀门有限公司 | Ultra-strong sealing high-performance slurry duplex ball valve capable of removing impurities under pressure for shield machine |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102829210A (en) * | 2012-08-22 | 2012-12-19 | 福建菲达阀门有限公司 | High-temperature discharging valve |
| CN203374868U (en) * | 2013-07-18 | 2014-01-01 | 山东益都阀门集团股份有限公司 | Full-bore semispherical valve |
| CN203686226U (en) * | 2014-01-26 | 2014-07-02 | 上海飞球阀门有限公司 | Emptying valve for melamine production line |
| CN204387380U (en) * | 2014-12-05 | 2015-06-10 | 河南泉舜流体控制科技有限公司 | Insulation semispherical valve |
| CN204985801U (en) * | 2014-12-30 | 2016-01-20 | 北京市阀门总厂股份有限公司 | Eccentric V -arrangement ball valve |
| CN107461512A (en) * | 2017-09-29 | 2017-12-12 | 池州市中智阀门科技有限公司 | A kind of hard sealing double eccentric half ball valve |
| CN207648190U (en) * | 2017-12-29 | 2018-07-24 | 浙江天特阀门有限公司 | Built-in type Full-diameter eccentric hemisphere valve |
| CN108799544A (en) * | 2018-08-29 | 2018-11-13 | 昆山维萨阀门有限公司 | A kind of metal sealing floating ball valve of jacketed |
| CN208982685U (en) * | 2018-08-30 | 2019-06-14 | 昆山维萨阀门股份有限公司 | A kind of metal hard-sealing ball valve |
| CN210800120U (en) * | 2019-09-11 | 2020-06-19 | 昆山维萨阀门股份有限公司 | Hemispherical metal sealing fixed ball valve with jacket |
-
2019
- 2019-09-11 CN CN201910857374.8A patent/CN110608296A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102829210A (en) * | 2012-08-22 | 2012-12-19 | 福建菲达阀门有限公司 | High-temperature discharging valve |
| CN203374868U (en) * | 2013-07-18 | 2014-01-01 | 山东益都阀门集团股份有限公司 | Full-bore semispherical valve |
| CN203686226U (en) * | 2014-01-26 | 2014-07-02 | 上海飞球阀门有限公司 | Emptying valve for melamine production line |
| CN204387380U (en) * | 2014-12-05 | 2015-06-10 | 河南泉舜流体控制科技有限公司 | Insulation semispherical valve |
| CN204985801U (en) * | 2014-12-30 | 2016-01-20 | 北京市阀门总厂股份有限公司 | Eccentric V -arrangement ball valve |
| CN107461512A (en) * | 2017-09-29 | 2017-12-12 | 池州市中智阀门科技有限公司 | A kind of hard sealing double eccentric half ball valve |
| CN207648190U (en) * | 2017-12-29 | 2018-07-24 | 浙江天特阀门有限公司 | Built-in type Full-diameter eccentric hemisphere valve |
| CN108799544A (en) * | 2018-08-29 | 2018-11-13 | 昆山维萨阀门有限公司 | A kind of metal sealing floating ball valve of jacketed |
| CN208982685U (en) * | 2018-08-30 | 2019-06-14 | 昆山维萨阀门股份有限公司 | A kind of metal hard-sealing ball valve |
| CN210800120U (en) * | 2019-09-11 | 2020-06-19 | 昆山维萨阀门股份有限公司 | Hemispherical metal sealing fixed ball valve with jacket |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111561604A (en) * | 2020-05-20 | 2020-08-21 | 王善波 | Valve with constant temperature function |
| CN113154092A (en) * | 2021-04-01 | 2021-07-23 | 浙江上工阀门有限公司 | Ultra-strong sealing high-performance slurry duplex ball valve capable of removing impurities under pressure for shield machine |
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