CN103090387B - Backfire preventing cutting torch - Google Patents
Backfire preventing cutting torch Download PDFInfo
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- CN103090387B CN103090387B CN201210577232.4A CN201210577232A CN103090387B CN 103090387 B CN103090387 B CN 103090387B CN 201210577232 A CN201210577232 A CN 201210577232A CN 103090387 B CN103090387 B CN 103090387B
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- acetylene
- cutting
- baffle plate
- mixing duct
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Abstract
Backfire preventing cutting torch, comprise cutting oxygen pipe road, oxy-acetylene mixing duct, the end of described cutting oxygen pipe road and oxy-acetylene mixing duct is provided with cutting head, it is characterized in that, at least one fireproof tempering device is provided with in described oxy-acetylene mixing duct, described fireproof tempering device comprises fixture, and described fixture is flexibly connected some activity templates, and described activity template is connected to each other by No. four elastic parts.Described activity template is the iron plate that there is antioxidation coating on surface.Described No. four elastic parts is spring.This invention significantly can improve the safety coefficient of cutting torch.
Description
Technical field
The present invention relates to a kind of cutting torch, specifically a kind of Backfire preventing cutting torch.
Background technology
Cutting torch is the main tool of gas cutting, can install or change cutting torch, regulates preheat flame gas flow and controls cutting oxygen flow.The effect of cutting torch is that oxygen is mixed in proportion with acetylene, form preheat flame, and pure oxygen in high pressure is ejected on cut workpiece, cut metal is burnt in oxygen jet, and oxygen jet also blows away the slag (oxide) that burning generates and form slot.Cutting torch is divided into jet absorption type and equal pressure two kinds by oxygen in preheat flame is different with the hybrid mode of acetylene, wherein general with the use of injector cutting torch.Cutting torch is divided into again common cutting torch, heavy type cutting torch and weldering by its purposes, cuts dual-purpose torch etc.Welding torch using method: the tightness that should check junction and each air valve before the igniting of welding torch, cutting torch.Also should check that it penetrates energy-absorbing power to the welding torch newly used and injector cutting torch.Welding torch, cutting torch igniting time should first open acetylene valve, after open oxygen valve; Nozzle aperture must not face toward people.When there is detonation because continuous operation is overheated in the tip of welding torch, cutting torch, application water cooling; As during detonation, then stopped using because of blocking, pick after leading to and can continue to use.The welding torch lighted, cutting torch is forbidden to hang on workpiece or put on the ground.The welding torch lighted, cutting torch is forbidden to hang on workpiece or put on the ground.Isobaric cutting torch should use the acetylene gas of medium pressure acetylene generator or acetylene gas bottle supply.Gas welding, gas cutting operating personnel should wear safety goggles.When using portable semi-automatic gas cutting machine or fixed automatic gas cutting machine, operating personnel should wear insulated shoes, and have the measure preventing from getting an electric shock.Should prevent cutter member from toppling over, falling during gas cutting.Distance mattess (or component) is too near or concentrate when carrying out gas cutting, should take provision for thermal insulation.Welding, cutting after hours, should be closed the air-supplying valve of oxygen, acetylene gas, and unload weldering (cutting) torch.Only must not close the valve of weldering (cutting) torch or airline hose bending is just left workplace.The airline hose do not unloaded from air-supplying valve, welding torch and cutting torch is forbidden to put into pipeline, container, case tank or tool box.With regard to the current cutting torch generally used, when there is tempering, cutting oxygen valve should be closed immediately, then closing acetylene control valve and preheat oxygen control valve.When normal work stops, Ying Xianguan cuts oxygen valve, then closes acetylene and preheat oxygen control valve.For this operation scheme, deal with improperly a little, will serious consequence be caused.
Summary of the invention
The present invention is directed to prior art deficiency, a kind of cutting torch that effectively can prevent tempering is provided.
For realizing above-mentioned technical purpose, the present invention is achieved by following technical proposals: Backfire preventing cutting torch, comprise cutting oxygen pipe road, oxy-acetylene mixing duct, the end of described cutting oxygen pipe road and oxy-acetylene mixing duct is provided with cutting head, it is characterized in that, be provided with at least one fireproof tempering device in described oxy-acetylene mixing duct, described fireproof tempering device comprises fixture, described fixture is flexibly connected some activity templates, and described activity template is connected to each other by No. four elastic parts.
In technique scheme, described activity template is the iron plate that there is antioxidation coating on surface.Described No. four elastic parts is spring.
The present invention compared with prior art, has following beneficial effect.
1, avoid tempering to enter oxy-acetylene mixing duct, heating handle makes it to grip.
2, tempering is avoided to enter steel cylinder and blast.
3, there is the iron plate of antioxidation coating using surface as activity template, prevent iron plate oxidized, affect anti-backfire effect.
4, spring is a kind of elastic parts that market easily obtains.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present invention.
Fig. 2 is fireproof tempering device structural representation in the embodiment of the present invention one.
Fig. 3 is fireproof tempering device structural representation in the embodiment of the present invention two.
Fig. 4 is fireproof tempering device structural representation in the embodiment of the present invention three.
Fig. 5 is fireproof tempering device structural representation in the embodiment of the present invention four.
Fig. 6 is fireproof tempering device structural representation in the embodiment of the present invention five.
Fig. 7 is fireproof tempering device structural representation in the embodiment of the present invention six.
Fig. 8 is the cross-sectional view of slide bar in Fig. 7.
Fig. 9 is fireproof tempering device structural representation in the embodiment of the present invention seven.
Figure 10 is fireproof tempering device structural representation in the embodiment of the present invention eight.
Figure 11 is A place schematic enlarged-scale view in Figure 10.
Figure 12 is B-B face sectional view in Figure 10.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail: embodiment 1: see Fig. 1 and Fig. 2, a kind of Backfire preventing cutting torch device, comprise cutting oxygen pipe road 2, oxy-acetylene mixing duct 3, the end of described cutting oxygen pipe road 2 and oxy-acetylene mixing duct 3 is provided with cutting head 1, described cutting oxygen pipe road is provided with cutting oxygen valve door 4, described oxy-acetylene mixing duct 3 is provided with preheating oxygen valve 5, and described cutting oxygen pipe road 2, oxy-acetylene mixing duct 3 are respectively arranged with air hose mouth 6 corresponding to the other end of cutting head 1.
Fireproof tempering device is provided with in described oxy-acetylene mixing duct 3, described fireproof tempering device comprises and is arranged on number one baffle plate 10 in oxy-acetylene mixing duct 3 and No. second baffle plate 11, described number one baffle plate 10 is near oxy-acetylene mist gas outlet, also namely, this number one baffle plate 10 is near cutting head 1.Described No. second baffle plate 11 is near oxy-acetylene mist air inlet.
Described number one baffle plate 10 has a piston rod 12 near middle part, described piston rod 12 one end is provided with first piston sheet 16, described piston rod 12 length is greater than number one baffle plate 10 and No. second baffle plate 11 spacing, piston rod 12 can left and right slippage, when described first piston sheet 16 is fitted in No. second baffle plate 11 sidewall, this first piston sheet 16 seals described third through-hole 14.
Described piston rod about 12 all offers the second through hole 13, circulates for oxy-acetylene mist; No. second baffle plate 11 center offers a third through-hole 14, and this third through-hole 14 is excessive with the unsuitable deviation in piston rod 12 position.After oxy-acetylene mist enters oxy-acetylene mixing duct 3, through the third through-hole 14 of No. second baffle plate 11, now piston rod 12 slides toward the left side, and first piston sheet 16 fixes piston rod 12 makes it not come off from the left side.
Oxy-acetylene mist then enters from the second through hole 13 of number one baffle plate 10, takes advantage of a situation and flows to cutting head 1 position, then cut.Just in case operating personnel's misoperation, when causing tempering, gas is gone back from the left side, piston rod 12 is pushed to right side from a left side, and now the first piston sheet 16 on right side presses close to the third through-hole 14 of No. second baffle plate 11, until cover third through-hole 14 completely.Oxy-acetylene mist is blocked in No. second baffle plate 11 place, thus effectively avoids tempering occurs.
Also be provided with elastic parts 18 between described number one baffle plate 10 and first piston sheet 16, one end of described elastic parts 18 leans on first piston sheet 16, and the other end leans on the sidewall of number one baffle plate 10.Preferably, described elastic parts 18 is spring.Spring housing is located on described piston rod 12.Be convenient to the fixing of spring.Spring 18 makes first piston sheet 16 touch third through-hole 14, is provided with spring 18 and can effectively prevents from cutting torch from moving causing piston rod 12 to be separated with third through-hole 14.Now No. second baffle plate 11 is in the effect of completely isolated the right and left, and gas cannot pass through from No. second baffle plate 11, just cannot get back to air inlet, thus effectively avoid tempering, eliminate potential safety hazard.
In addition, install second piston sheet 15 on the left of piston additional, during tempering, when on the left of being also, air-flow is turned right and flowed, the second piston sheet 15 increases the lifting surface area of piston rod 12, and promotion piston rod 12 is past rapidly moves right.
Embodiment 2: compared with embodiment 1, difference is, the structure of described fireproof tempering device is different, and all the other are all identical.
See Fig. 3, described a kind of Backfire preventing cutting torch device comprises at least two pieces of fixed heads 211 being arranged on oxy-acetylene mixing duct 3 inwall, described fixed head 211 is welded on oxy-acetylene mixing duct 3, and be positioned at 5 cm places on the right of cutting head 1, fixed head 211 is stainless steel products.There are 8 portable plates 212 described fixed head 211 the same side by hinge, described portable plate 212 adopts iron to make, one end of 4 wherein said portable plates 212 is provided with magnet 213, and is provided with the portable plate of magnet and does not arrange the portable plate interval layout of magnet.
Like this when portable plate is not by external force, the end of portable plate can be made to condense together.Be understandable that, also can be provided with magnet 213 on described portable plate 212.And the contrary mode of magnet 213 opposite sex arranges.So more be conducive to the end of portable plate is condensed together.
Described portable plate 212 length is greater than described oxy-acetylene mixing duct 3 radius.
During normal use, air-flow pushes activity template open, and finally flows to cutting head 1.Just in case operating personnel's misoperation, when there is tempering, fire stream refluxes from cutting torch position 1 is past, through fireproof tempering device, and fire stream contact portable plate 212, portable plate 212 is promoted from left to right, now magnet 213 by two pieces of portable plate 212 compact siro spinning technology together, according to physical knowledge, for power from left to right, this fireproof tempering device cannot be opened, excised the security incident that tempering occurs thoroughly.
Embodiment 3: compared with embodiment 1, difference is, the structure of described fireproof tempering device is different, and all the other are all identical.
See Fig. 4, described a kind of fireproof tempering device comprises and is arranged on No. three baffle plate 110 in oxy-acetylene mixing duct 3 and No. four baffle plate 111, described No. three baffle plate 110 is provided with the fourth hole 113 of oxygen supply acetylene gas mixture circulation, and described No. three baffle plate 110 is provided with the second elastic parts 118.One end of described two No. three elastic parts 5118 is provided with black box 119.Described No. four baffle plate 111 is provided with fifth hole 114, described black box 119 fit described fifth hole 114 time seal described fifth hole 114.In the present invention, described second elastic parts 118 is spring, the spheroid that described black box 119 is made for flexible material.
Mist is turned left from the right side flowing, through fifth hole 114, black box 119 body is promoted toward the left side, black box 119 promotes the second elastic parts 118, pressurized second elastic parts 118 is shunk, gas enters between No. three baffle plate 110 and No. four baffle plate 111, flows out from fourth hole 113, final arrival cutting head 1.
When there is tempering, tempering stream flows from the left side toward the right, through No. three baffle plate 110, enter between No. three baffle plate 110 and No. four baffle plate 111 from fourth hole 113, now, the second elastic parts 118 promotes black box 119, black box 119 is made closely to be pressed on fifth hole 114, seal fifth hole 114, tempering stream cannot pass fifth hole 114, also just cannot cause potential safety hazard to device.Being made up of fire proofing material of described black box 119, burned or thawing of black box etc. when preventing tempering thus destroy device.Black box 119 is preferably and adopts flexible material to make in addition, because adopt flexible material to make the sealing completely be more of value to fifth hole 114.Certainly, square black box 119 is also passable, only needs corresponding fifth hole 114 can engage completely with black box 119, has finally reached hermetic effect.
Embodiment 4: compared with embodiment 1, difference is, the structure of described fireproof tempering device is different, and all the other are all identical.
See Fig. 5, described a kind of fireproof tempering device comprises and is arranged on No. five baffle plate 310 in oxy-acetylene mixing duct 3 and No. six baffle plate 311, described No. five baffle plate 310 is provided with the 6th through hole 313, described No. six baffle plate 311 is provided with the 7th through hole 314, be provided with sliding shoe 315 between described No. five baffle plate 310 and No. six baffle plate 311, described sliding shoe is provided with inclined-plane corresponding to the 7th through hole 314 place.
Described No. five baffle plate 310 offers a groove 316, and described sliding shoe 315 is provided with projection 317 corresponding to this groove 316 place, and described projection 317 can along the slippage of groove 316 long side direction.Being provided with groove 316 with projection 317 is prevent sliding shoe from rotating at No. five baffle plate 310 and No. six baffle plate 311 in effect.
In normal use procedure, gas enters from the 7th through hole 314, and because air pressure is higher, sliding shoe 315 rises by gas, and gas is through the 6th through hole 314, and device normally uses.
If operating personnel's misoperation, when there is tempering, tempering stream enters from the 6th through hole 313, and due to the stop of sliding shoe, tempering stream can not enter to the 7th through hole 314.
The air pressure that gas produces is to the effect on sliding shoe 315 inclined-plane, and sliding shoe 315 can be made easily to increase, and inclined-plane can be concave slope, convex inclined-plane or waveform inclined-plane.Described convex inclined-plane refers to that the gradient is upper slow lower steep inclined-plane on the spot; Described concave slope refers to that the gradient is upper steep lower slow inclined-plane on the spot, and described wavy inclined-plane is gradient crossbar transistion on the spot, steep slow differ, the irregular inclined-plane of corrugate shape.
Embodiment 5: compared with embodiment 1, difference is, the structure of described fireproof tempering device is different, and all the other are all identical.
See Fig. 6, described a kind of fireproof tempering device comprises and is arranged on No. seven baffle plate 410 in oxy-acetylene mixing duct 3 and No. eight baffle plate 411, described No. seven baffle plate 410 is near cutting head 1, the 8th through hole 412 that oxygen supply acetylene gas mixture passes through is provided with in described No. seven baffle plate 410, No. eight through hole 412 is arranged on middle top, No. nine through hole 413 that oxygen supply acetylene gas mixture passes through is provided with in described No. eight baffle plate 411, equally, No. nine through hole 413 is arranged on middle top, No. two fixed heads 415 are provided with between described No. seven baffle plate 410 and No. eight baffle plate 411, No. two fixed heads 415 downward vertically, be articulated and connected No. nine baffle plate 416, No. nine baffle plate 416 can be rotated by tie point, described No. nine baffle plate 416 one end is provided with magnet 417, described No. two fixed head 415 relevant positions are provided with No. three fixed heads 418, the magnet 417 of No. three fixed heads 418 and No. nine baffle plate 416 one end is combined into fixture, after No. nine baffle plate 416 is fixed, oxy-acetylene mixing duct 3 is sealing state.
When cutting torch uses, oxy-acetylene mist is entered by No. nine through hole 413, and due to larger air pressure, blow No. nine baffle plate 416 open, oxy-acetylene mist flows out from No. eight through hole 412 again, takes advantage of a situation and flows to cutting head 1 position, then cut.
When operating personnel's misoperation causes tempering, tempering is entered by No. eight through hole 412, but now No. nine baffle plate 416 by magnet 417 and No. three fixed heads 418 the fixture that forms fix, tempering cannot be passed, just air inlet cannot be got back to, thus effectively avoided tempering, eliminate potential safety hazard.Add the stop of stopper 419, limit the rotation direction of No. nine baffle plate 416, the deeper circulation blocking tempering.
Embodiment 6: compared with embodiment 1, difference is, the structure of described fireproof tempering device is different, and all the other are all identical.
See Fig. 7 and Fig. 8, described a kind of fireproof tempering device comprises No. ten baffle plate 515 being fixedly arranged on described oxy-acetylene mixing duct 3 inwall, described No. ten baffle plate 515 is provided with No. ten through hole 516, slide bar 509 is installed with in described oxy-acetylene mixing duct 3, the cross section of described slide bar 509 is polygon, described slide bar 509 is by the center of described oxy-acetylene mixing duct 3 cross section, described slide bar 509 has an angle with the axis of described oxy-acetylene mixing duct 3, described slide bar 509 is arranged with the first slide block 510, described slide bar 509 is arranged with No. three elastic parts 511, one end of described No. three elastic parts 511 connects described first slide block 510, the other end of described No. three elastic parts 511 is fixed on described oxy-acetylene mixing duct 3 inwall, when described fireproof tempering device is in closed condition, described first slide block 510, the inwall of described oxy-acetylene mixing duct 3 and the described No. ten baffle plate 515 surround the first inflatable chamber 513, described first inflatable chamber 513 is only communicated with the first inner chamber 514 of described oxy-acetylene mixing duct 3 by the described No. ten through hole 516.
Described slide bar 509 is arranged on the first side, outlet side 517 of the described No. ten baffle plate 515.Described No. three elastic parts 511 is spring.
Before operation, fireproof tempering device, cutting oxygen valve door 4 and preheating oxygen valve 5 are all in closed condition.Operation starts, open cutting oxygen valve door 4 and preheating oxygen valve 5, oxygen in steel cylinder and acetylene enter oxy-acetylene mixing duct 3 and mix, mist washes the first slide block 510 open, then taken out of by oxygen jet and burn at cutting torch 1 gas vent, jet flame fusing workpiece or other metals reach the object of cutting.After having operated, the power washing the first slide block 510 open reduces and disappears, and preoperative state is got back in the effect that the first slide block 510 is subject to No. three elastic parts 511, and fireproof tempering device is closed, stop gas to flow through completely, thus stop flame tempering to handle even steel cylinder.Avoid acetylene tempering to heat handle to make it to grip.The more important thing is, avoid flame tempering to steel cylinder, light acetylene and blast, thus greatly improve cutting torch security.
Embodiment 7: compared with embodiment 1, difference is, the structure of described fireproof tempering device is different, and all the other are all identical.
See Fig. 9, described a kind of fireproof tempering device comprises the fixture 623 being fixedly arranged on described oxy-acetylene mixing duct 3 inwall, and described fixture 623 is flexibly connected some activity templates 622, and described activity template 622 is connected to each other by No. four elastic parts 621.Described activity template 622 is the iron plate that there is antioxidation coating on surface.Described No. four elastic parts 621 is spring.
Before operation, fireproof tempering device, cutting oxygen valve door 4 and preheating oxygen valve 5 are all in closed condition.Operation starts, open cutting oxygen valve door 4 and preheating oxygen valve 5, the oxygen in steel cylinder and acetylene enter oxy-acetylene mixing duct 3 and mix, and mist washes activity template 622 open, then in the burning of cutting torch 1 gas vent, jet flame fusing workpiece or other metals reach the object of cutting.After having operated, the power washing activity template 622 open reduces and disappears, and preoperative state is got back in the effect that activity template 622 is subject to No. four elastic parts 621, and fireproof tempering device is closed, and stops gas to flow through completely, thus stops flame tempering to handle even steel cylinder.Avoid acetylene tempering to heat handle to make it to grip.The more important thing is, avoid flame tempering to steel cylinder, light acetylene and blast, thus greatly improve cutting torch security.
Embodiment 8: compared with embodiment 1, difference is, the structure of described fireproof tempering device is different, and all the other are all identical.
See Figure 10, Figure 11 and Figure 12, described a kind of fireproof tempering device comprises the ride on Bus No. 11 baffle plate 715 being fixedly arranged on described oxy-acetylene mixing duct 3 inwall, described ride on Bus No. 11 baffle plate 715 is provided with ride on Bus No. 11 through hole 716, described oxy-acetylene mixing duct 3 inwall is provided with the chute 712 along described oxy-acetylene mixing duct 3 axis, No. five elastic parts 709 is provided with in described chute 712, described No. five elastic parts 709 connects the inserts 717 be embedded in chute 712, the second slide block 710 is connected by connecting portion 718 above described inserts 717, described No. five elastic parts 709 other end is fixed on the acetylene airintake direction end of described chute 712, when described fireproof tempering device 2 is in closed condition, described second slide block 710, inwall and the described ride on Bus No. 11 baffle plate 715 of described oxy-acetylene mixing duct 3 surround the second inflatable chamber 713, described second inflatable chamber 713 is only communicated with the second inner chamber 714 by described ride on Bus No. 11 through hole 716.
Described second slide block 710 is arranged on the acetylene airintake direction side of described ride on Bus No. 11 baffle plate 715, and described chute 712 is arranged on the acetylene airintake direction side of described second slide block 710.Described No. five elastic parts 709 is spring.
Before operation, fireproof tempering device, cutting oxygen valve door 4 and preheating oxygen valve 5 are all in closed condition.Operation starts, open cutting oxygen valve door 4 and preheating oxygen valve 5, the oxygen in steel cylinder and acetylene enter oxy-acetylene mixing duct 3 and mix, and mist washes the second slide block 710 open, then in the burning of cutting torch 1 gas vent, jet flame fusing workpiece or other metals reach the object of cutting.After having operated, the power washing the second slide block 710 open reduces and disappears, and preoperative state is got back in the effect that the second slide block 710 is subject to No. five elastic parts 709, and fireproof tempering device is closed, stop gas to flow through completely, thus stop flame tempering to handle even steel cylinder.Avoid acetylene tempering to heat handle to make it to grip.The more important thing is, avoid flame tempering to steel cylinder, light acetylene and blast, thus greatly improve cutting torch security.
Claims (3)
1. Backfire preventing cutting torch, comprise cutting oxygen pipe road (2), oxy-acetylene mixing duct (3), the end of described cutting oxygen pipe road (2) and oxy-acetylene mixing duct (3) is provided with cutting head (1), it is characterized in that, at least one fireproof tempering device is provided with in described oxy-acetylene mixing duct (3), described fireproof tempering device comprises fixture (623), described fixture (623) is upper is flexibly connected some activity templates (622), and described activity template (622) is connected to each other by elastic parts (621).
2. Backfire preventing cutting torch according to claim 1, is characterized in that, described activity template (622) is the iron plate that there is antioxidation coating on surface.
3. Backfire preventing cutting torch according to claim 1, is characterized in that, described elastic parts (621) is spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210577232.4A CN103090387B (en) | 2012-12-27 | 2012-12-27 | Backfire preventing cutting torch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210577232.4A CN103090387B (en) | 2012-12-27 | 2012-12-27 | Backfire preventing cutting torch |
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| Publication Number | Publication Date |
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| CN103090387A CN103090387A (en) | 2013-05-08 |
| CN103090387B true CN103090387B (en) | 2015-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210577232.4A Expired - Fee Related CN103090387B (en) | 2012-12-27 | 2012-12-27 | Backfire preventing cutting torch |
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| CN (1) | CN103090387B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107484367B (en) * | 2017-07-10 | 2020-03-10 | 新昌县登恺农业开发有限公司 | Communication box convenient to installation |
| CN110542122B (en) * | 2019-08-31 | 2020-12-04 | 江西发扬实业有限公司 | Methane stove sealed based on airflow |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2140022Y (en) * | 1992-10-20 | 1993-08-11 | 胡联兴企业有限公司 | Anti-inverse, flashback safety gas cutting structure |
| JPH09217629A (en) * | 1996-02-14 | 1997-08-19 | Suzuki Motor Corp | Lead valve device for two cycle engine |
| CN2320855Y (en) * | 1998-04-08 | 1999-05-26 | 乐清市铜管件厂 | Check valve |
| EP1210536A4 (en) * | 1999-06-15 | 2002-08-28 | Ip One Pty Ltd | A non-return valve |
| KR20030015175A (en) * | 2002-12-09 | 2003-02-20 | 이광석 | Check valve to shield fluid flow by forming magnetic force in the trumpet rubber tube |
| CN2874279Y (en) * | 2006-02-16 | 2007-02-28 | 郭守德 | Anti-flash back cutting gun |
| CN202228731U (en) * | 2011-09-05 | 2012-05-23 | 安徽荣达阀门有限公司 | Wafer type dish check valve |
| CN203010605U (en) * | 2012-12-27 | 2013-06-19 | 宁波市江北兴达焊割减压仪表厂 | Tempering-preventing cutting torch |
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