CN103322257B - Protection device of fuel gas valve - Google Patents
Protection device of fuel gas valve Download PDFInfo
- Publication number
- CN103322257B CN103322257B CN201310289663.5A CN201310289663A CN103322257B CN 103322257 B CN103322257 B CN 103322257B CN 201310289663 A CN201310289663 A CN 201310289663A CN 103322257 B CN103322257 B CN 103322257B
- Authority
- CN
- China
- Prior art keywords
- seal
- spring
- axle sleeve
- protective gear
- gas valve
- 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.)
- Active
Links
Landscapes
- Mechanically-Actuated Valves (AREA)
Abstract
The invention provides a protection device of a fuel gas valve and belongs to the technical field of machines. The protection device of the fuel gas valve solves the problems that an existing fuel gas valve is low in safety performance and the like. The protection device of the fuel gas valve comprises a valve body, a valve rod and a valve element, wherein the valve body is provided with an air inlet pipe and an air outlet pipe, and the valve element is arranged in the valve body. One end of the valve rod is connected with the valve element, and the other end of the valve rod penetrates out of the valve body. The protection device is fixed in the valve body. The protection device comprises a shaft sleeve, a sealing shaft, a sealing gasket and a spring. The shaft sleeve is fixed in the valve body, and the sealing shaft is axially arranged in the shaft sleeve in a sliding and penetrating mode. One end of the sealing shaft is provided with the sealing gasket, the spring is sleeved on the sealing shaft, one end of the spring abuts against the sealing gasket, and the other end of the spring abuts against the shaft sleeve. When the spring is compressed, sealing is formed between the sealing gasket and the shaft sleeve so as to block circulation of fuel gas. The protection device of the fuel gas valve has the advantages of being simple in structure, good in safety performance, long in service life and the like.
Description
Technical field
The invention belongs to field of mechanical technique, relate to a kind of protective gear, particularly a kind of protective gear of gas valve.
Background technique
At present, combustion gas, as fuel, is deep into huge numbers of families, particularly big and medium-sized cities, and pipeline gas is installed to kitchen, and wherein gas valve is very important parts, is opened by the opening and closing controlling gas valve or is blocked pipeline gas.When using pipeline gas, particularly cook cook time, positive utensil may be made to extinguish when gaseous-pressure exceedes certain pressure, at this moment people just cannot learn because pipeline gas air pressure is too high that cause or cause due to burner problem own.
In order to overcome the above problems, people have invented the gas valve with detection combustion gas air pressure function of all kinds, and such as Chinese patent literature data discloses the gas valve [application number: 200810120670.1 of band pressure-detecting device; Authorization Notice No.: CN101354097B], it comprises valve body, the valve rod with suction tude and steam outlet pipe and is positioned at the spool of valve body, one end and the spool of valve rod are connected, the other end passes valve body, suction tude has pressure tap, pressure-detecting device is provided with outside suction tude, suction tude be provided be axially fixed in suction tude and can circumference rotate valve pocket, form sealing between valve pocket and suction tude, be provided with between valve pocket and suction tude when valve pocket moves into the annular groove that pressure tap can be made all the time to be connected with pressure-detecting device when tracheae circumference is rotated.
The gas valve of this kind of structure, valve pocket is axially fixed in suction tude and can circumference rotates, and no matter how this gas pipeline is laid, and only need rotate valve pocket and pressure valve just can be made to be in best test position, easy to detect.But the gas valve of this kind of structure in use; when gas valve is flow through in combustion gas; when the flow of combustion gas, pressure exceed normal pressure; or the situations such as the damaged leakage of sebific duct; due to the gas valve of this kind of structure; itself does not have safety protection device, and cannot alleviate in time and even discharge dangerous situation, Safety performance is lower.
Summary of the invention
The object of the invention is for the above-mentioned problems in the prior art, provide the protective gear of the gas valve that a kind of structure is simple, Safety performance is good.
Object of the present invention realizes by following technical proposal: a kind of protective gear of gas valve, gas valve comprises the valve body with suction tude and steam outlet pipe, valve rod and the spool being positioned at valve body, one end of described valve rod is connected with spool, the other end passes valve body, it is characterized in that, described protective gear is fixed in valve body, described protective gear comprises axle sleeve, seal shaft, gasket seal and spring, described axle sleeve is fixed in valve body, described seal shaft along axle sleeve axis arrange and slide be located in axle sleeve, one end of described seal shaft is provided with described gasket seal, described spring housing is on seal shaft, one end of described spring is resisted against on gasket seal, the other end is resisted against on axle sleeve, when described spring is compressed, above-mentioned gasket seal can be formed to seal with axle sleeve and block gas circulation.
Spring itself has elastic force, and the value of elastic of spring is certain, and when the flow of combustion gas, pressure are in normal state, between the effect lower seal pad and axle sleeve of spring force, have the passage for gas circulation, combustion gas is normally circulated; Normal flow rate or paranormal pressure is flowed exceed once combustion gas, the thrust being greater than spring force is produced during fuel gas flow, combustion gas promotes gasket seal Compress Spring, seal shaft moving axially along axle sleeve, makes gasket seal abut against the side of axle sleeve, is formed airtight between gasket seal and axle sleeve, block the circulation of combustion gas, combustion gas can not be revealed, and gas accidents can not occur, and Safety performance is good; Just realize by spring, gasket seal, seal shaft and axle sleeve the object blocking pipeline gas when combustion gas surpasses stream, superpressure, structure is simple.
In the protective gear of above-mentioned a kind of gas valve; described protective gear also comprises adjusting nut; described adjusting nut and seal shaft are connected by screw thread, and described adjusting nut is positioned at the outside of gasket seal, and described gasket seal and seal shaft are slidably connected.By precession or back-out adjusting nut, adjust the decrement of spring, thus change the elastic force of spring, make the value that the value of elastic of spring reaches default, regulate simple.
In the protective gear of above-mentioned a kind of gas valve, described gasket seal comprises hard gasket and soft seal pad, and described hard gasket and soft seal pad are connected by stickup.Can not excessive deformation when hard gasket makes soft seal pad move left and right along seal shaft, play the effect of support, soft seal pad is rubber gasket, produces certain deformation, good sealing effect during sealing.
In the protective gear of above-mentioned a kind of gas valve, the edge of described soft seal pad sidepiece has convex annular ball, described axle sleeve has the annular slope matched with convex annular ball.When gasket seal and axle sleeve formed seal time, convex annular ball be embedded on annular slope formed sealing, increase sealing area, good sealing effect.
In the protective gear of above-mentioned a kind of gas valve; the center of described soft seal pad sidepiece has annular projection; the described external diameter of annular projection and the internal diameter of spring match, and described spring housing is in the outside of annular projection, and one end of spring is resisted against on soft seal pad.Annular projection plays the effect of retaining spring, makes spring can not double swerve, and spring good stability, spring force value just keeps constant, and spring force precision is high, makes the protected effect of this protective gear good.
In the protective gear of above-mentioned a kind of gas valve, the center of described axle sleeve is fixed with guide cylinder, and described seal shaft is located in guide cylinder, and the other end of described seal shaft has annular shoulder block.Guide cylinder play the guiding role, the internal diameter of guide cylinder and the external diameter of seal shaft match, seal shaft can not be rocked along during the axial left and right translation of axle sleeve, thus make spring keep stable, spring force precision is high, annular shoulder block makes seal shaft can not come off in guide cylinder because of the elastic force of spring, and structure is simple.
In the protective gear of above-mentioned a kind of gas valve, described guide cylinder is connected by fastener rings mutually with axle sleeve.Join strength is high.
In the protective gear of above-mentioned a kind of gas valve, the external diameter of described guide cylinder and the internal diameter of spring match, and described spring housing is located at the outside of guide cylinder, and the other end of spring is resisted against on fastener rings.Guide cylinder plays the effect of retaining spring, makes spring can not double swerve, and spring good stability, spring force value just keeps constant, and spring force precision is high, makes the protected effect of this protective gear good.
In the protective gear of above-mentioned a kind of gas valve; one end of described axle sleeve is fixed with air inlet cover by screw thread; described air inlet puts has inlet hole, and the cross-section area of described inlet hole is slightly less than the cross-section area of gasket seal, and described adjusting nut, gasket seal are all positioned at air inlet cover.Inlet hole and gasket seal are just to setting, and air inlet cover guides air-flow to flow into from inlet hole and all focuses on gasket seal, makes gasket seal front bear flow velocity and the pressure of combustion gas, and the thrust of generation is passed to spring accurately.
In the protective gear of above-mentioned a kind of gas valve, described protective gear is fixed in spool, has seal ring between described axle sleeve and spool.Gas valve is when closing, and there is not potential safety hazard, now protective gear is positioned at spool, does not bear the impact of the out-of-date generation of gas flow, reduces the operating time of this protective gear, long service life; When gas valve is opened, this protective gear is simultaneously in running order, effectively avoids because of gas accidentses such as overpressure of gas, super stream and the damaged leakages of sebific duct; gap between seal ring sealing axle sleeve and spool; combustion gas can not from this gap seepage, and good sealing effect, pressure sensitive precision is high.
In the protective gear of above-mentioned a kind of gas valve; described axle sleeve and spool drive fit are connected; the madial wall of described spool has annular groove one, the outer side wall of described axle sleeve has annular groove two, described seal ring is positioned at annular groove one and annular groove two.Axle sleeve and spool drive fit are connected, connect simple, annular groove one and annular groove two provide the mounting point of seal ring, seal ring is positioned at annular groove one and annular groove two, closes the gap between axle sleeve and spool, combustion gas can not be oozed out between axle sleeve and spool, good sealing effect, and seal ring makes axle sleeve all be positioned at this position, place of spool when locating, during batch production, the high conformity of product.
Compared with prior art, the protective gear of gas valve provided by the invention has the following advantages:
1, the protective gear of this gas valve is fixed in spool; when gas valve is closed; there is not the problems such as combustion gas super stream, hypervelocity; this protective gear is in off working state; when gas valve is opened, this protective gear is in protective position and plays a protective role, this kind of structure; the operating time of effective this protective gear of minimizing, long service life.
2, the protective gear of this gas valve is by the decrement of adjusting nut adjustment spring, makes the elastic force of spring meet predefined value, regulates simple.
3, the protective gear spring housing of this gas valve is in the outside of seal shaft; one end of spring is enclosed within the outside of annular projection; the other end is enclosed within the outside of guide cylinder; the external diameter of annular projection and guide cylinder all matches with the internal diameter of spring, all spring is played to the effect of location, and the phenomenon offset can not occur spring; spring good stability; the elastic constant of spring, elastic force precision is high, and the protected effect of this protective gear is good.
4, the protective gear of this gas valve is provided with air inlet cover, and air inlet cover guides air-flow to focus on gasket seal, and the thrust that fuel gas flow produces is born in gasket seal front, and accurately the thrust of combustion gas is passed to spring, transmitting accuracy is high.
5, the annular slope on the convex annular ball at the edge, protective gear soft seal pad outer circumferential of this gas valve and axle sleeve circumference inner side edge edge matches, and during sealing, convex annular ball is close to and is combined on annular slope, good sealing effect.
Accompanying drawing explanation
Fig. 1 is the overall structure sectional view of this band protective gear gas valve.
Sectional view when Fig. 2 is the protective gear normal operating condition of this gas valve.
Fig. 3 is the sectional view when protective gear of this gas valve surpasses stream, superpressure is ended.
Fig. 4 is the side view of the protective gear axle sleeve of this gas valve.
In figure, 1, valve body; 1a, suction tude; 1b, steam outlet pipe; 2, valve rod; 3, spool; 4, axle sleeve; 4a, annular slope; 5, seal shaft; 5a, annular shoulder block; 6, gasket seal; 6a, hard gasket; 6b, soft seal pad; 6b1, convex annular ball; 6b2, annular projection; 7, spring; 8, seal ring; 9, adjusting nut; 10, guide cylinder; 11, fastener rings; 12, air inlet cover; 12a, inlet hole.
Embodiment
Be below specific embodiments of the invention and by reference to the accompanying drawings, technological scheme of the present invention is further described, but the present invention be not limited to these embodiments.
As shown in Figure 1, this gas valve comprises valve body 1, the valve rod 2 with suction tude 1a and steam outlet pipe 1b and is positioned at the spool 3 of valve body 1, one end of valve rod 2 is connected with spool 3, the other end passes outside valve body 1 and is connected with handle, steam outlet pipe 1b has pressure-detecting device, and this pressure-detecting device can lay out tracheae 1b rotates.This protective gear is fixed in spool 3, comprises axle sleeve 4, seal shaft 5, gasket seal 6, spring 7, adjusting nut 9, seal ring 8 and air inlet cover 12.
The external diameter of axle sleeve 4 and the internal diameter of spool 3 match, axle sleeve 4 is by being tightly fixed in spool 3, the madial wall of spool 3 has annular groove one, the outer side wall of axle sleeve 4 has annular groove two, seal ring 8 is arranged in annular groove one and annular groove two, and seal shaft 5 overlaps the gap between 4 and spool 3, and plays the effect of location to the installation of axle sleeve 4, in batch production, each axle sleeve 4 is made to be installed in same position in spool 3.As shown in Figure 4, the center of axle sleeve 4 is fixed with guide cylinder 10 by fastener rings 11, slide in guide cylinder 10 and be equipped with seal shaft 5, seal shaft 5 is arranged along the axis of guide cylinder 10, one end of seal shaft 5 is fixed with adjusting nut 9 by screw thread, the end that seal shaft 5 is positioned at the other end of guide cylinder 10 has annular shoulder block 5a, and adjusting nut 9 and annular shoulder block 5a make seal shaft 5 can not come off in guide cylinder 10.Gasket seal 6 is slidably located in the outside of seal shaft 5, comprise hard gasket 6a and soft seal pad 6b, hard gasket 6a is made up of metallic material, and soft seal pad 6b is made up of rubber material, and both are connected by stickup, hard gasket 6a and adjusting nut 9 fit.The edge of soft seal pad 6b sidepiece has convex annular ball 6b1, axle sleeve 4 there is in week annular slope 4a to the inside that match with convex annular ball 6b1.The center of soft seal pad 6b sidepiece has annular projection 6b2, the external diameter of annular projection 6b2 and the internal diameter of spring 7 match, the external diameter of guide cylinder 10 also matches with the internal diameter of spring 7, spring 7 is set on seal shaft 5, one end of spring 7 is enclosed within the outside of annular projection 6b2, and be resisted against on soft seal pad 6b, the other end is enclosed within the outside of guide cylinder 10, and be resisted against on fastener rings 11, annular projection 6b2 and guide cylinder 10 all play the effect of location to spring 7, spring 7 can not double swerve, the good stability of spring 7, elastic constant.One end of axle sleeve 4 is fixed with air inlet cover 12 by screw thread, air inlet cover 12 has inlet hole 12a, when gas valve is opened, air inlet cover 12 is near the suction tude 1a of valve body 1, the cross-section area of inlet hole 12a is slightly less than the rank street area of gasket seal 6, and adjusting nut 9 and gasket seal 6 are all positioned at air inlet cover 12.
As shown in Figure 2; this kind of state is the state that this protective gear is in when normally using; combustion gas enters in spool 3 from suction tude 1a; all concentrated by the guiding function of air inlet cover 12 and impact gasket seal 6; fuel gas flow is impacted the thrust produced and is less than or equals the elastic force of spring 7; be in the state of unlatching between gasket seal 6 and axle sleeve 4, there is between gasket seal 6 and axle sleeve 4 passage passed through for combustion gas.
As shown in Figure 3; this kind of state is the state that this protective gear is in protection cut-off; combustion gas is entered as in spool 3 from suction tude 1a; all concentrated by the guiding function of air inlet cover 12 and impact gasket seal 6; the situations such as super stream, superpressure are in due to combustion gas; the thrust that combustion gas impact gasket seal 6 produces is greater than the elastic force of spring 7; spring 7 is compressed; the convex annular ball 6b1 of soft seal pad 6b is resisted against the interior formation sealing of annular slope 4a of axle sleeve 4; the circulation of combustion gas in cut-off gas valve; combustion gas can not be revealed, and effectively avoids the generation of gas accidents.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Although more employ the term such as valve body 1, suction tude 1a, steam outlet pipe 1b, valve rod 2, spool 3, axle sleeve 4, annular slope 4a, seal shaft 5, annular shoulder block 5a, gasket seal 6, hard gasket 6a, soft seal pad 6b, convex annular ball 6b1, annular projection 6b2, spring 7, seal ring 8, adjusting nut 9, guide cylinder 10, fastener rings 11, air inlet cover 12, inlet hole 12a herein, do not get rid of the possibility using other term.These terms are used to be only used to describe and explain essence of the present invention more easily; The restriction that they are construed to any one additional is all contrary with spirit of the present invention.
Claims (9)
1. the protective gear of a gas valve, gas valve comprises the valve body (1) with suction tude (1a) and steam outlet pipe (1b), valve rod (2) and be positioned at the spool (3) of valve body (1), one end of described valve rod (2) is connected with spool (3), the other end passes valve body (1), it is characterized in that, described protective gear is fixed in valve body (1), described protective gear comprises axle sleeve (4), seal shaft (5), gasket seal (6) and spring (7), described axle sleeve (4) is fixed in valve body (1), described seal shaft (5) along axle sleeve (4) axis arrange and slide be located in axle sleeve (4), one end of described seal shaft (5) is provided with described gasket seal (6), described spring (7) is enclosed within seal shaft (5), one end of described spring (7) is resisted against on gasket seal (6), the other end is resisted against on axle sleeve (4), when described spring (7) is by compression, above-mentioned gasket seal (6) can be formed to seal with axle sleeve (4) and block gas circulation, one end of described axle sleeve (4) is fixed with air inlet cover (12) by screw thread, described air inlet cover (12) has inlet hole (12a), the cross-section area of described inlet hole (12a) is slightly less than the cross-section area of gasket seal (6), described gasket seal (6) is positioned at air inlet cover (12).
2. the protective gear of a kind of gas valve according to claim 1; it is characterized in that; described protective gear also comprises adjusting nut (9); described adjusting nut (9) and seal shaft (5) are connected by screw thread; and described adjusting nut (9) is positioned at the outside of gasket seal (6), described gasket seal (6) and seal shaft (5) are slidably connected.
3. the protective gear of a kind of gas valve according to claim 1 and 2; it is characterized in that; described gasket seal (6) comprises hard gasket (6a) and soft seal pad (6b), and described hard gasket (6a) and soft seal pad (6b) are connected by stickup.
4. the protective gear of a kind of gas valve according to claim 3; it is characterized in that; the edge of described soft seal pad (6b) sidepiece has convex annular ball (6b1), described axle sleeve (4) has the annular slope (4a) matched with convex annular ball (6b1).
5. the protective gear of a kind of gas valve according to claim 3; it is characterized in that; the center of described soft seal pad (6b) sidepiece has annular projection (6b2); the external diameter of described annular projection (6b2) and the internal diameter of spring (7) match; described spring (7) is enclosed within the outside of annular projection (6b2), and one end of spring (7) is resisted against on soft seal pad (6b).
6. the protective gear of a kind of gas valve according to claim 1 and 2; it is characterized in that; the center of described axle sleeve (4) is fixed with guide cylinder (10); described seal shaft (5) is located in guide cylinder (10), and the other end of described seal shaft (5) has annular shoulder block (5a).
7. the protective gear of a kind of gas valve according to claim 6, is characterized in that, described guide cylinder (10) is connected by fastener rings (11) mutually with axle sleeve (4).
8. the protective gear of a kind of gas valve according to claim 7; it is characterized in that; the external diameter of described guide cylinder (10) and the internal diameter of spring (7) match; described spring (7) is set in the outside of guide cylinder (10), and the other end of spring (7) is resisted against on fastener rings (11).
9. the protective gear of a kind of gas valve according to claim 1 and 2; it is characterized in that; described protective gear is fixed in spool (3); there is between described axle sleeve (4) and spool (3) seal ring (8); described axle sleeve (4) and spool (3) drive fit are connected; the madial wall of described spool (3) has annular groove one; the outer side wall of described axle sleeve (4) has annular groove two, and described seal ring (8) is positioned at annular groove one and annular groove two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310289663.5A CN103322257B (en) | 2013-07-10 | 2013-07-10 | Protection device of fuel gas valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310289663.5A CN103322257B (en) | 2013-07-10 | 2013-07-10 | Protection device of fuel gas valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103322257A CN103322257A (en) | 2013-09-25 |
| CN103322257B true CN103322257B (en) | 2015-05-06 |
Family
ID=49191190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310289663.5A Active CN103322257B (en) | 2013-07-10 | 2013-07-10 | Protection device of fuel gas valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103322257B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106499849A (en) * | 2016-12-30 | 2017-03-15 | 玉环县中良铜业有限公司 | A kind of burnt gas leakage security valve |
| CN108980430A (en) * | 2018-07-18 | 2018-12-11 | 苏州福特曼机器人***有限公司 | Overcurrent stop valve |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4846221A (en) * | 1987-05-21 | 1989-07-11 | Kitz Corporation | Ball valve with built-in check valve |
| CN2498423Y (en) * | 2001-08-21 | 2002-07-03 | 叶云勤 | Security valve against leakage of gas pipeline |
| EP1508730A1 (en) * | 2003-08-22 | 2005-02-23 | Metallwerke Otto Dingerkus GmbH | Excess flow valve for pipelines |
| CN201071946Y (en) * | 2007-08-06 | 2008-06-11 | 山东力诺瑞特新能源有限公司 | Ball check valve |
| CN201827468U (en) * | 2010-11-03 | 2011-05-11 | 标准液压独股公司 | Ball valve with check valve and filter |
| CN203384437U (en) * | 2013-07-10 | 2014-01-08 | 玉环燃具实业有限公司 | Protection device of fuel gas valve |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002310314A (en) * | 2001-04-10 | 2002-10-23 | Hitachi Metals Ltd | Excessive flow-preventing valve |
-
2013
- 2013-07-10 CN CN201310289663.5A patent/CN103322257B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4846221A (en) * | 1987-05-21 | 1989-07-11 | Kitz Corporation | Ball valve with built-in check valve |
| CN2498423Y (en) * | 2001-08-21 | 2002-07-03 | 叶云勤 | Security valve against leakage of gas pipeline |
| EP1508730A1 (en) * | 2003-08-22 | 2005-02-23 | Metallwerke Otto Dingerkus GmbH | Excess flow valve for pipelines |
| CN201071946Y (en) * | 2007-08-06 | 2008-06-11 | 山东力诺瑞特新能源有限公司 | Ball check valve |
| CN201827468U (en) * | 2010-11-03 | 2011-05-11 | 标准液压独股公司 | Ball valve with check valve and filter |
| CN203384437U (en) * | 2013-07-10 | 2014-01-08 | 玉环燃具实业有限公司 | Protection device of fuel gas valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103322257A (en) | 2013-09-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2797942A1 (en) | Sleeve seal assembly and rotary valve having sleeve seal assembly | |
| CN104930206B (en) | Shut-off valve | |
| CN103322257B (en) | Protection device of fuel gas valve | |
| CN203272899U (en) | Ball check valve | |
| CN103671995A (en) | Two-piston type axial flow regulating valve | |
| CN203757101U (en) | Emergency cut-off safety device | |
| CN202790762U (en) | Fuel gas self-closing valve | |
| CN103256415A (en) | Gas ball valve capable of shutting down automatically under overpressure or overcurrent condition | |
| CN205013725U (en) | Modular multi -functional gate valve | |
| CN203384437U (en) | Protection device of fuel gas valve | |
| CN205877318U (en) | Gas self - closing valves | |
| CN107940095A (en) | A kind of multifunctional fuel self-closing valve | |
| CN205663900U (en) | Special governing valve of high temperature high pressure | |
| CN109424332B (en) | Natural gas well constant pressure throttling arrangement | |
| CN205859260U (en) | Band non-return valve core ball valve | |
| CN208793867U (en) | A kind of quick coupling of good seal performance | |
| CN209959950U (en) | Safety valve | |
| CN208364837U (en) | Valve for chemical industry | |
| CN208311608U (en) | A kind of axial-flow type pressure reducing valve | |
| CN208858844U (en) | A kind of rear shock absorber of motorcycle of ram pot good seal performance | |
| CN104565402A (en) | Valve | |
| CN205078834U (en) | Anti -fire ball vale | |
| CN205350370U (en) | Marine right angle choke valve | |
| CN211649081U (en) | Gas super-flow self-closing valve body structure | |
| CN211649130U (en) | Hydraulic pipeline for hydraulic engineering |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |