CN101551062A - Multifunctional fuel safety protecting device - Google Patents
Multifunctional fuel safety protecting device Download PDFInfo
- Publication number
- CN101551062A CN101551062A CNA2008100908232A CN200810090823A CN101551062A CN 101551062 A CN101551062 A CN 101551062A CN A2008100908232 A CNA2008100908232 A CN A2008100908232A CN 200810090823 A CN200810090823 A CN 200810090823A CN 101551062 A CN101551062 A CN 101551062A
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- Prior art keywords
- fuel
- pressure
- pressure regulation
- gas
- valve
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- 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.)
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Links
- 239000000446 fuel Substances 0.000 title claims abstract description 42
- 239000000567 combustion gas Substances 0.000 claims description 43
- 239000007789 gas Substances 0.000 claims description 40
- 238000007789 sealing Methods 0.000 claims description 6
- 239000002737 fuel gas Substances 0.000 claims description 4
- 238000005299 abrasion Methods 0.000 abstract 2
- 230000000694 effects Effects 0.000 description 19
- 230000015556 catabolic process Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003915 liquefied petroleum gas Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Feeding And Controlling Fuel (AREA)
Abstract
The invention relates to a multifunctional fuel safety protecting device which is characterized in that an elastic valve core consequently closing fuel and controlled by the pressure of the fuel is arranged at a fuel inlet pipe of the prior fuel reducing valve, the valve core is matched with a valve seat consequently closing the fuel, internal-close type tapered switch valve protecting a switch against abrasion and leakage is arranged at a fuel outlet pipe so as to achieve the purposes of preventing the abrasion and the leakage of the switch, accidently-unjointed pipe leakage, ultralow pipe pressure, pipe fuel supply stopping, and pipe-supplied fuel entering house, and automatically closing the fuel when a user forgets closing a fuel valve. In order to be convenient for starting the fuel for use, the top end of an upper casing is also provided with a starting switch which can automatically restore; in order to ensure the fuel safety protecting device is used more safely in high-pressure fuel, the proper position of the fuel inlet pipe is provided with a round ball valve core and a round ball valve core which are matched mutually; in order to ensure that the fuel safety protecting device can be normally safely used in low-pressure pipe fuel, the center of a lower casing is provided with a permanent magnet which is matched with a gag bit at the bottom of a pressure-adjusting pull rod.
Description
Technical field:
The present invention relates to a kind of fuel safety protecting device, relate in particular to a kind of multifunctional fuel safety protecting device that accidental gas leakage is closed automatically that has.
Background technique:
At present, the fuel safety protecting device kind is numerous and diverse, and representative has three kinds approximately; First kind is super flow gas leakage automatic close-type safety protection device, its shortcoming is: it only can satisfy in high pressure or middle compression ignite gas and uses, if use in the pipeline low-pressure fuel gas, when accidental gas leakage occurring, it fails effective automatic self-closing gas, performs practically no function; Second kind is the automatic reverse close type safety protection device of gas leakage, and its shortcoming is: it only can guarantee to use in the setting pressure scope, if suction pressure obviously when setting the working pressure scope, just it automatically breakdown leak gas and cause bigger danger; The third is automatically controlled warning class safety protection device, and its shortcoming is: need the electric energy electricity wasting energy that is used as power, simultaneously, also need manually regularly to safeguard, if just electronic alarm can be malfunctioning by kitchen fume pollution, equally also perform practically no function.
Summary of the invention:
A kind of multifunctional fuel safety protecting device provided by the invention, it not only can use in the high, medium and low voltage combustion gas and guarantee safety, and does not need automatically controlled and artificial regularly maintenance.
According to above-mentioned purpose, a kind of multifunctional fuel safety protecting device provided by the invention, it comprises housing, housing has the gas-entered passageway that is interconnected, forward closes combustion gas valve seat, reverse pressure regulation mouth, gaseous-pressure chamber, outlet passageway; Housing is divided into upper shell and lower shell body again, installs rubber film between upper shell and lower shell body, and at rubber film center position installing pressure regulation pull bar; The pressure regulation lever is installed on the lever strong point, one end inserts in the pressure regulation pull bar, the other end connects the pressure regulation push rod and cooperatively interacts at terminal little plug of pressure regulation of installing of pressure regulation push rod and reverse pressure regulation mouth, to reach the effect of regulating gaseous-pressure in charge flow rate and the regulation valve body; Center position above rubber film is installed a pressure adjusting spring and upper shell and is headed on mutually, to reach the effect of automatic adjusting air inlet closing pressure; Be characterized in: forward close the elastic force spool of combustion gas and forward close the combustion gas valve seat and cooperatively interact one of gas-entered passageway appropriate position installing; Spool push rod of installing interconnects or heads on mutually between elastic force spool and the little plug of pressure regulation, by combustion gas self pressure control, pressure regulation lever drives pressure regulation push rod, the little plug of pressure regulation, spool push rod are cooperatively interacted push the elastic force spool open, the effect of automatic self-closing gas when reaching normal ventilation and accidental gas leakage; In order to ensure the safety of using in the low pressure pipeline combustion gas, the armature plate that also can install a block permanent magnet and pressure regulation pull bar bottom at the lower shell body center position cooperatively interacts, and inhales the effect that pressure regulation pull bar down cuts out combustion gas when taking notice of outer gas leakage mutually fast to reach; Install an enable switch pull-button at upper shell top center position, and the enable switch pull-button is inserted in the pull-button guide sleeve; At hollow guiding cover of enable switch pull-button center position installing, and be inserted in a Returnning spring in the hollow guiding cover outside and pull-button guide sleeve inside top heads on mutually, to reach automatically reset effect after the combustion gas of enable switch pull-button breakdown; Insert in the hollow guiding cover starting pull bar, an end is connected with pressure regulation pull bar upper end, and the other end and hollow guiding cover stick mutually, makes things convenient for the normal effect of using of breakdown combustion gas to reach; Maximum safety in order to ensure the high-pressure gas use, appropriate position at gas-entered passageway, also can increase installing a ball valve seat and a ball spool and cooperatively interact, the effect of quick assistance elastic force spool automatic self-closing gas when reaching the super flow of accidental gas leakage; This multifunctional fuel safety protecting device also comprises a conical switch valve of inner sealing formula that prevents to wear and tear and leak gas; The conical switch valve of described inner sealing formula, it comprises valve chest, valve chest has suction port and the air outlet that is interconnected, conical rotary spool of installing between suction port and air outlet, and conical rotary spool inserted in the conical valve pocket cooperatively interact; Being inserted in a pressure spring and spool cover cap in rotary valve rod heads on mutually; Compress conical rotary spool to reach, prevent the effect of combustion gas toward external leakage; Also install a switch handle at the rotary valve rod end and cooperatively interact, to reach the convenient effect that opens and closes combustion gas.
The main core technology of this multifunctional fuel safety protecting device is: utilize combustion gas self pressure control forward to close the work that cooperatively interacts of the elastic force spool of combustion gas and the valve seat of forward closing combustion gas, guarantee the purpose of pacifying to reach the accidental gas leakage automatic self-closing gas.
Beneficial effect
The invention has the beneficial effects as follows: in the high, medium and low voltage combustion gas, use, when accident leaks air flow abnormity it all effectively automatic self-closing gas guarantee safety, simultaneously, ultralow or stop the supple of gas or steam when not having air pressure or air feed house lead in also can automatic self-closing gas when pressure, guarantee maximum safety, and do not need artificial regularly the maintenance and energy saving.
Description of drawings:
Below in conjunction with accompanying drawing multifunctional fuel safety protecting device of the present invention is described in further detail.
Fig. 1 is a multifunctional fuel safety protecting device normal ventilation of the present invention side-looking structural representation when using;
Fig. 2 is the side-looking structural representation of multifunctional fuel safety protecting device of the present invention gas leakage when closing automatically;
Fig. 3 is the side-looking structural representation that multifunctional fuel safety protecting device of the present invention uses in high-pressure gas;
Fig. 4 is the side-looking structural representation that multifunctional fuel safety protecting device of the present invention uses in the compression ignite gas in pipeline;
Fig. 5 is the side-looking structural representation that multifunctional fuel safety protecting device of the present invention uses in the pipeline low-pressure fuel gas;
Among Fig. 1,1, housing; 2, gas-entered passageway; 3, forward close combustion gas valve seat rubber film; 10, pressure regulation pull bar; 11, pressure regulation lever; The 12 lever strong points 13, pressure regulation push rod; 14, the little plug of pressure regulation; 15, pressure adjusting spring; 16, elastic force spool; 17, spool push rod; 18, permanent magnet; 19, armature plate; 20, enable switch draws knob; 21, draw the knob guide sleeve; 22, hollow guiding cover; 23, Returnning spring; 24, starting bar; 25, ball valve seat; 26, ball spool; 27, conical switch valve; 28, valve chest; 29, suction port; 30, air outlet; 31, conical rotary spool; 32, conical valve pocket; 33, rotary valve rod; 34, pressure spring; 35, spool cover cap; 36, switch knob.
Embodiment:
Referring to accompanying drawing 1, a kind of multifunctional fuel safety protecting device provided by the invention, it comprises housing (1), and housing (1) has the gas-entered passageway (2) that is interconnected, forward closes combustion gas valve seat (3), reverse pressure regulation mouth (4), gaseous-pressure chamber (5), outlet passageway (6); Housing is divided into upper shell (7) and lower shell body (8) again, installs rubber film (9) between upper shell (7) and lower shell body (8), and at rubber film (9) center position installing pressure regulation pull bar (10); Pressure regulation lever (11) is installed on the lever strong point (12), one end inserts in the pressure regulation pull bar (10), the other end connects pressure regulation push rod (13) and cooperatively interacts at terminal little plug of pressure regulation of installing of pressure regulation push rod (13) (14) and reverse pressure regulation mouth (4), to reach the effect of regulating gaseous-pressure in charge flow rate and the regulation valve body; At rubber film (9) top center position, install a pressure adjusting spring (15) and head on mutually, to reach the effect of automatic adjusting air inlet closing pressure with upper shell (7); Be characterized in: forward close the elastic force spool (16) of combustion gas and forward close combustion gas valve seat (3) and cooperatively interact one of gas-entered passageway (2) appropriate position installing; A spool push rod of installing (17) interconnects or heads on mutually between elastic force spool (16) and the little plug of pressure regulation (14), by combustion gas self pressure control, make pressure regulation lever (11) drive pressure regulation push rod (13), the little plug of pressure regulation (14), spool push rod (17) and cooperatively interact and push elastic force spool (16) open, the effect of automatic self-closing gas when reaching normal ventilation and accidental gas leakage; In order to ensure the safety of in the low pressure pipeline combustion gas, using, the armature plate (19) that also can install a block permanent magnet (18) and pressure regulation pull bar (10) bottom at lower shell body (8) center position cooperatively interacts, and inhales the effect that pressure regulation pull bar (10) down cuts out combustion gas when taking notice of outer gas leakage mutually fast to reach; Install an enable switch pull-button (20) at upper shell (7) top center position, and enable switch pull-button (20) is inserted in the pull-button guide sleeve (21); At enable switch pull-button (a 20) center position installing hollow guiding cover (22), and be inserted in a Returnning spring (23) in hollow guiding cover (22) outside and head on mutually with pull-button guide sleeve (21) inside top, to reach automatically reset effect after enable switch pull-button (20) the breakdown combustion gas; Insert in the hollow guiding cover (22) starting pull bar (24), an end is connected with pressure regulation pull bar (10) upper end, and the other end and hollow guiding cover (22) stick mutually, makes things convenient for the normal effect of using of breakdown combustion gas to reach; In order to ensure the maximum safety of in high-pressure gas, using, appropriate position in gas-entered passageway (2), also can increase a ball valve seat of installing (25) and cooperatively interact with a ball spool (26), the effect of assistance elastic force spool (16) automatic self-closing gas fast when reaching the super flow of accidental gas leakage; This multifunctional fuel safety protecting device also comprises an inner sealing formula horn-break switch valve (27) that prevents to wear and tear and leak gas, the conical switch valve (27) of described inner sealing formula, it comprises valve chest (28), valve chest (28) has the suction port (29) and air outlet (30) that is interconnected, an installing conical rotary spool (31) between suction port (29) and air outlet (30), and conical rotary valve (31) inserted in the conical valve pocket (32) cooperatively interact; Being inserted in a pressure spring (34) in rotary valve rod (33) heads on mutually with spool cover cap (35); To reach the effect that conical rotary spool (31) prevents the past external leakage of combustion gas that compresses; (3 interworkings are closed, to reach the convenient purpose that opens and closes combustion gas at rotary valve rod.
The main core technology of this multifunctional fuel safety protecting device is: utilize combustion gas self pressure control forward to close the work that cooperatively interacts of the elastic force spool (16) of combustion gas and the valve seat (3) of forward closing combustion gas, automatic self-closing gas is guaranteed purpose of safety when reaching accidental gas leakage.
Operation instruction:
This multifunctional fuel safety protecting device can manufacture the yarn row product of multiple different structure; Can in the bottled combustion gas of high pressure, use, also can in middle pressure or low pressure pipeline combustion gas, use; As in high-pressure gas, using, can remove described permanent magnet (18) and armature plate (19) (as shown in Figure 3); As in the road combustion gas of middle pressure pipe, using, except that removing permanent magnet (18) and armature plate (19), can also remove described ball spool (26) and ball valve seat (25) (as shown in Figure 4); As in the low pressure pipeline combustion gas, using, except that removing described ball spool (26) and ball valve seat (25), the while can also keep voltage regulation function according to actual needs or remove voltage regulation function and (promptly keep pressure adjusting spring (15) and the little plug of pressure regulation (14) or remove pressure adjusting spring (15) and the reservation little plug of pressure regulation (14) (as shown in Figure 5).This multifunctional fuel safety protecting device, as be installed in the pipeline gas gauge table and use, also can reach equal safe effect.Annotate: described combustion gas is meant liquefied petroleum gas (LPG), rock gas or artificial synthesis combustion gas.
Using method:
Earlier the gas-entered passageway of this multifunctional fuel safety protecting device (2) end is connected fuel gas source, air outlet (30) end connects gas equipment (as household water heater, gas cooking range etc.).When needs use combustion gas, by drawing enable switch pull-button (20) on artificial the exerting oneself, make in succession pressure regulation push rod (13), the little plug of pressure regulation (14) of pressure regulation lever (11) assist mutually to push the Elastic valve core (16) of forward closing combustion gas open with spool push rod (17), combustion gas just can normally enter in the gaseous-pressure chamber (5); Under the effect of combustion gas self pressure, described rubber film (9) is up splashed forever and is risen, and this safety protection device just is in normally open and proper functioning (as shown in Figure 1); When accident is taken off pipe or other reasons gas leakage or stopped the supple of gas or steam when not having air pressure; under the interaction of pressure adjusting spring (15) power and permanent magnet (18) suction, ball spool (26) power, this multifunctional fuel safety protecting device just can forward be closed combustion gas (as shown in Figure 2) automatically.Annotate: Fig. 3, Fig. 4 using method and above-mentioned same this paper have not promptly done detailed explanation, are appreciated that).
Claims (2)
1, a kind of multifunctional fuel safety protecting device, it comprises housing (1), housing (1) has the gas-entered passageway (2) that is interconnected, forward closes combustion gas valve seat (3), reverse pressure regulation mouth (4), gaseous-pressure chamber (5), outlet passageway (6); Housing is divided into upper shell (7) and lower shell body (8) again, installs rubber film (9) between upper shell (7) and lower shell body (8), and at rubber film (9) center position installing pressure regulation pull bar (10); Pressure regulation lever (11) is installed on the lever strong point (12), and an end inserts in the pressure regulation pull bar (10), and the other end connects pressure regulation push rod (13) and cooperatively interacts at terminal little plug of pressure regulation of installing of pressure regulation push rod (13) (14) and reverse pressure regulation mouth (4); At rubber film (9) top center position, install a pressure adjusting spring (15) and head on mutually with upper shell (7); It is characterized in that: one of appropriate position installing is forward closed the elastic force spool (16) of combustion gas and is forward closed combustion gas valve seat (3) and cooperatively interacts in gas-entered passageway (2); A spool push rod of installing (17) interconnects or heads on mutually between elastic force spool (16) and the little plug of pressure regulation (14); In order to ensure the safety of in the pipeline low-pressure fuel gas, using,, install the armature plate (19) of a block permanent magnet (18) bottom pressure regulation pull bar (10) and cooperatively interact at lower shell body (8) center position; Install an enable switch pull-button (20) at upper shell (7) top center position, and enable switch pull-button (20) is inserted in the pull-button guide sleeve (21); At enable switch pull-button (20) center position, install a hollow guiding cover (22), and be inserted in a Returnning spring (23) in hollow guiding cover (22) outside and head on mutually with pull-button guide sleeve (21) inside top; Insert in the hollow guiding cover (22) starting pull bar (24), an end is connected with pressure regulation pull bar (10) upper end, and the other end and hollow guiding cover (22) stick mutually; In order to ensure the maximum safety of using in the high-pressure gas, the appropriate position in gas-entered passageway (2) also can increase a ball valve seat of installing (25) and cooperatively interact with a ball spool (26); This multifunctional fuel safety protecting device comprises that also the conical switch valve of inner sealing formula (27) that leaks gas that prevents to wear and tear cooperatively interacts.
2, a kind of multifunctional fuel safety protecting device according to claim 1, it is characterized in that: the conical switch valve (27) of described inner sealing formula, it comprises valve chest (28), valve chest (28) has the suction port (29) and air outlet (30) that is interconnected, between suction port (29) and air outlet (30), install a conical rotary spool (31), and conical rotary spool (31) is inserted in the conical valve pocket (32); Being inserted in a pressure spring (34) in rotary valve rod (33) heads on mutually with spool cover cap (35); Also install a switch handle (36) at rotary valve rod (33) end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810090823 CN101551062B (en) | 2008-04-04 | 2008-04-04 | Multifunctional fuel safety protecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810090823 CN101551062B (en) | 2008-04-04 | 2008-04-04 | Multifunctional fuel safety protecting device |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101166077A Division CN102720872A (en) | 2008-04-04 | 2008-04-04 | Multifunctional gas safety protection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101551062A true CN101551062A (en) | 2009-10-07 |
| CN101551062B CN101551062B (en) | 2013-04-10 |
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ID=41155456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200810090823 Active CN101551062B (en) | 2008-04-04 | 2008-04-04 | Multifunctional fuel safety protecting device |
Country Status (1)
| Country | Link |
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| CN (1) | CN101551062B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103244727A (en) * | 2012-02-14 | 2013-08-14 | 罗达莱克斯阀门(上海)有限公司 | Pressure regulating device and pressure regulator thereof |
| CN103759064A (en) * | 2014-01-09 | 2014-04-30 | 合肥远智自动化科技有限公司 | Ultralow-pressure precise pressure reducing valve |
| CN104514902A (en) * | 2013-09-26 | 2015-04-15 | 江门市尚域科技开发有限公司 | Gas valve |
| TWI686555B (en) * | 2019-01-09 | 2020-03-01 | 白翼誌 | Fluid safety switch structure |
| CN112152136A (en) * | 2020-09-21 | 2020-12-29 | 湖北省电力装备有限公司 | Gas-insulated metal-enclosed switchgear for high-voltage power |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU605168B2 (en) * | 1987-08-25 | 1991-01-10 | Rong-Chao Chuang | Forward direction closing safety valve device for automatically shutting the gas pipeline passage off during pressure reducing failure |
| DE10043811B4 (en) * | 2000-09-06 | 2004-09-02 | Mertik Maxitrol Gmbh & Co. Kg | Excess flow valve |
| CN1508477A (en) * | 2002-08-23 | 2004-06-30 | 珉 张 | Gas safety vavle for complete kitchen |
| CN2837662Y (en) * | 2005-05-26 | 2006-11-15 | 张珉 | Complete gas safety device |
| CN2837640Y (en) * | 2005-09-08 | 2006-11-15 | 张珉 | Explosion-proof energy-saving relief valve for gas |
-
2008
- 2008-04-04 CN CN 200810090823 patent/CN101551062B/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103244727A (en) * | 2012-02-14 | 2013-08-14 | 罗达莱克斯阀门(上海)有限公司 | Pressure regulating device and pressure regulator thereof |
| CN103244727B (en) * | 2012-02-14 | 2016-01-20 | 罗达莱克斯阀门(上海)有限公司 | Regulator and pressure governor thereof |
| CN104514902A (en) * | 2013-09-26 | 2015-04-15 | 江门市尚域科技开发有限公司 | Gas valve |
| CN103759064A (en) * | 2014-01-09 | 2014-04-30 | 合肥远智自动化科技有限公司 | Ultralow-pressure precise pressure reducing valve |
| TWI686555B (en) * | 2019-01-09 | 2020-03-01 | 白翼誌 | Fluid safety switch structure |
| CN112152136A (en) * | 2020-09-21 | 2020-12-29 | 湖北省电力装备有限公司 | Gas-insulated metal-enclosed switchgear for high-voltage power |
| CN112152136B (en) * | 2020-09-21 | 2023-01-20 | 湖北省电力装备有限公司 | Gas-insulated metal-enclosed switchgear for high-voltage power |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101551062B (en) | 2013-04-10 |
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Effective date of registration: 20130426 Address after: 710016 Fengcheng Road, Shaanxi, No. six, No. 135, Xi'an Patentee after: Shaanxi Datang Intelligent Instrument Instrument Co., Ltd. Address before: 571100 Hainan Province, Haikou City Road No. 68 Hainan Baiju procuratorial first branch Patentee before: Zhang Min |
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Address after: 710016 Fengcheng Road, Shaanxi, No. six, No. 135, Xi'an Patentee after: Shaanxi Datang gas safety Polytron Technologies Inc Address before: 710016 Fengcheng Road, Shaanxi, No. six, No. 135, Xi'an Patentee before: Shaanxi Datang Intelligent Instrument Instrument Co., Ltd. |
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Denomination of invention: A multifunctional gas safety protection device Effective date of registration: 20201021 Granted publication date: 20130410 Pledgee: Xi'an Science and Technology Financial Service Center Co.,Ltd. Pledgor: SHAANXI DATANG GAS SAFETY TECHNOLOGY Co.,Ltd. Registration number: Y2020610000177 |
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Date of cancellation: 20220125 Granted publication date: 20130410 Pledgee: Xi'an Science and Technology Financial Service Center Co.,Ltd. Pledgor: SHAANXI DATANG GAS SAFETY TECHNOLOGY CO.,LTD. Registration number: Y2020610000177 |
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Denomination of invention: A multifunctional gas safety protection device Effective date of registration: 20220127 Granted publication date: 20130410 Pledgee: Xi'an Science and Technology Financial Service Center Co.,Ltd. Pledgor: SHAANXI DATANG GAS SAFETY TECHNOLOGY CO.,LTD. Registration number: Y2022610000005 |
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