CN105351533B - Double containment fire hydrant - Google Patents
Double containment fire hydrant Download PDFInfo
- Publication number
- CN105351533B CN105351533B CN201510753771.2A CN201510753771A CN105351533B CN 105351533 B CN105351533 B CN 105351533B CN 201510753771 A CN201510753771 A CN 201510753771A CN 105351533 B CN105351533 B CN 105351533B
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- Prior art keywords
- valve
- valve body
- sealing
- bearing
- plate
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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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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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C35/00—Permanently-installed equipment
- A62C35/20—Hydrants, e.g. wall-hoses, wall units, plug-in cabinets
-
- 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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/46—Attachment of sealing rings
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
- Details Of Valves (AREA)
Abstract
The present invention relates to a kind of double containment fire hydrants, including valve seat, valve rod, intake tunnel and the valve body being set on valve seat, the side of valve body is equipped with water outlet mouthpiece, the hollow formation valve cavity of valve inner, and body top and bottom are open, body top is equipped with valve body gland, valve body gland is equipped with sealing cover, valve rod passes vertically through sealing cover and valve body gland, and it extends in valve cavity, water outlet mouthpiece is connected with valve cavity, intake tunnel passes vertically through valve seat and is connected with valve cavity, valve stem top is equipped with the handwheel rotated with ovable valve stem, the place of being bordered by of valve body gland and valve rod is equipped with the first sealing structure, body base is equipped with second seals structure, the lower end of second seals structure and valve rod is slidably connected, second seals structure can be rotated respectively with valve rod or second seals structure does not rotate.Sealing effect of the present invention is good, can solve fire hydrant seepy question caused by being not closed completely, and be easy to switch, to timely put out a fire.
Description
Technical field
The present invention relates to a kind of fire hydrant more particularly to a kind of double containment fire hydrants.
Background technology
Fire hydrant is as a kind of fire fighting supply facility, mainly for fire fighting truck from municipal water supply pipe network or outdoor fire fighting feed pipe
Fire extinguishing is implemented in net water intaking, or directly connect and put out a fire with rotary hose, hydraulic giant.For a long time, in subway work installing engineering,
Often meet the fire hydrant used on the hydrant system in fire-fighting system seepy question caused by closing and is poorly sealed, this is asked
The appearance of topic annoyings always metro fire-fighting system and the operation security of vehicle, while also being brought to construction quality and maintenance management
Prodigious trouble.Moreover, traditional fire hydrant makes valve rod move upwards in rotation handwheel, to open valve plate using high pressure water flow into
When row fire extinguishing, rotation handwheel is very difficult and laborious, causes quickly open valve plate, to be delayed fire extinguishing good opportunity.
In view of the above shortcomings, the designer is actively subject to research and innovation, to found a kind of new structural double density
Fire hydrant is sealed, makes it with more the utility value in industry.
Invention content
In order to solve the above technical problems, that the object of the present invention is to provide a kind of sealing effects is good, is easy to the double containment of switch
Fire hydrant.
The present invention double containment fire hydrant, including valve seat, be set on the valve seat intake tunnel, be set to the valve
The valve body of seat top, the valve rod that is set in the valve body, the side of the valve body are equipped with water outlet mouthpiece, in the valve inner
Sky forms valve cavity, which is connected with water outlet mouthpiece, the body top and bottom be respectively arranged with it is described
The upper opening and under shed that valve cavity is connected, the under shed are connected with intake tunnel, the body top be equipped with
The upper compatible valve body gland that is open, the valve body gland are equipped with sealing cover, and the valve rod stretches to valve body by valve body
In cavity, and sealing cover valve body gland is sequentially passed through, the valve rod is described with the top being located at outside the valve body and relatively
Top is arranged and stretches to the bottom end in the valve cavity, and the top is equipped with the handwheel rotated with ovable valve stem, under described
Opening in be equipped with second seals structure, and the second seals structure can the relatively described under shed above and below the moving direction of valve body
Mobile, the second seals structure and the lower end of the valve rod are slidably connected, and the second seals structure includes that radial seal is hard
It is hard that the soft valve plate of valve plate, lateral seal and sealing clamp, the sealing clamp and the soft valve plate stacking of lateral seal are placed in radial seal
On valve plate, the sealing clamp top surface is provided with toroidal cavity, is provided in the toroidal cavity for reducing the valve rod
The radial-thrust bearing of frictional resistance between sealing clamp rotates the handwheel band ovable valve stem and is pressed down against sealing clamp, makes
The soft valve plate of lateral seal starts to deform under the action of sealing clamp and radial seal hard valve plate, and close with the valve interior wall
It is bonded and forms sealing.
Further, the hard valve plate of the radial seal includes discoid bottom and columned upward convex from the bottom
The lug boss formed is acted, the sealing clamp and the soft valve plate of lateral seal are discoid, and are laminated and to be sleeved on the radial direction close
It seals on the lug boss of hard valve plate.
Further, the bottom surface of the valve rod invaginates to form a groove, the columned protrusion of the hard valve plate of radial seal
Portion stretches into the groove, and can be slided up and down in the groove.
Further, the lug boss of the hard valve plate of the radial seal is surrounded with the activity promotion key of circular ring shape, the activity
The frictional force that the lug boss that promotion bond energy enough reduces the hard valve plate of radial seal generates when being slided in the groove of stem bottom, it is described
The limit steel loop of circular ring shape is surrounded on the outer wall of stem lower portion, the limit steel loop can prevent valve rod from valve body gland inward turning
Go out.
Further, the body base and the soft valve plate corresponding section of lateral seal are equipped with the guide groove of a ring shape, when the
It is described to open to sealing soft valve plate under the action of sealing clamp and radial seal hard valve plate when two sealing structures close intake tunnel
Begin to deform, and being capable of prolonged expansion, realization sealing into the guide groove.
Further, being equipped between the valve rod and valve body gland prevents the water in valve cavity from being flowed out from valve body gland
First sealing structure, first sealing structure are cirque structure, including double O-ring seals and setting in double O-ring seals
The bearing of lower section, double O-ring seals and bearing are fixed on by sealing cover between valve rod and valve body gland.
Further, the bearing includes bearing inner race, bearing retainer and bearing outer ring, and the bearing inner race setting exists
The inner ring of the bearing retainer, the bearing outer ring are arranged in the outer ring of the bearing retainer, and the valve rod sequentially passes through
Double O-ring seals and bearing.
Further, the handwheel is fixed on valve stem top by handwheel fixing screws.
Further, the lower end outer wall of the valve rod is equipped with external screw thread, and the inner wall of the valve body gland is equipped with and institute
State the internal thread that external screw thread matches.
Further, the valve seat and valve body are integrally formed.
By above-mentioned technical proposal, the present invention has at least the following advantages：The second seals structure of the present invention and valve rod energy
Enough rotation or second seals structure respectively do not rotate so that the rotation of valve rod is no longer restricted by second seals structure, in turn
So that hand wheel rotating valve rod is more laborsaving, it is easier to second seals structure is opened, so that fire extinguishing is more rapid, timely；Rotation
Changing hands wheel makes valve rod move downward, and then second seals structure is driven to playback downwards, to block intake tunnel, that is, closes
The double containment fire hydrant, sealing effect are good.
Above description is only the general introduction of technical solution of the present invention, in order to better understand the technical means of the present invention,
And can be implemented in accordance with the contents of the specification, below with presently preferred embodiments of the present invention and after coordinating attached drawing to be described in detail such as.
Description of the drawings
Fig. 1 is the structural schematic diagram of double containment fire hydrant of the present invention.
In figure：1, valve seat；2, valve rod；3, intake tunnel；4, valve body；5, water outlet mouthpiece；6, valve cavity；7, valve body pressure
Lid；8, sealing cover；9, handwheel；10, the first sealing structure；11, second seals structure；12, double O-ring seals；13, in bearing
Circle；14, bearing retainer；15, bearing outer ring；16, the hard valve plate of radial seal；17, the soft valve plate of lateral seal；18, sealing clamp；
19, radial-thrust bearing；20, groove；21, activity promotes key；22, steel loop is limited；23, guide groove；24, handwheel fixing screws.
Specific implementation mode
With reference to the accompanying drawings and examples, the specific implementation mode of the present invention is described in further detail.Implement below
Example is not limited to the scope of the present invention for illustrating the present invention.
Referring to Fig. 1, a kind of double containment fire hydrant described in a preferred embodiment of the present invention, including valve seat 1, be set to it is described
Intake tunnel 3, the valve body 4 for being set to 1 top of the valve seat on valve seat 1, the valve rod 2 being set in the valve body 4, the valve
The side of body 4 is equipped with water outlet mouthpiece 5, and 4 inner hollow of the valve body forms valve cavity 6, the valve cavity 6 and water outlet mouthpiece 5
It is connected, 4 top and bottom of the valve body are respectively arranged with the upper opening being connected with the valve cavity 6 and under shed, institute
It states under shed with intake tunnel 3 to be connected, the top of the valve body 4 is equipped with the compatible valve body gland 7 with the upper opening, described
Valve body gland 7 is equipped with sealing cover 8, and the valve rod 2 is stretched to by valve body 4 in valve cavity 6, and sequentially passes through 8 valve of sealing cover
Body gland 7, the valve rod 2 have the top being located at outside the valve body 4 and the relatively described top setting and stretch to the valve
Bottom end in body cavity 6, the top are equipped with the handwheel 9 rotated with ovable valve stem 2, and the second sealing is equipped in the under shed and is tied
Structure 11, and the second seals structure can the relatively described under shed moved up and down along the moving direction of valve body, it is described second sealing
Structure 11 and the lower end of the valve rod 2 are slidably connected, and the second seals structure 11 includes the hard valve plate 16 of radial seal, lateral close
Seal soft valve plate 17 and sealing clamp 18, the vertical section of the hard valve plate of the radial seal 16 is in inverted T shaped, the sealing clamp 18 and side
It being placed on the hard valve plate of radial seal 16 to the stacking of soft valve plate 17 is sealed, 18 top surface of the sealing clamp is provided with toroidal cavity,
The radial-thrust bearing for reducing frictional resistance between the valve rod 2 and sealing clamp 18 is provided in the toroidal cavity
19, it rotates the handwheel 9 and is pressed down against sealing clamp 18 with ovable valve stem 2, make the soft valve plate 17 of lateral seal in 18 He of sealing clamp
Start to deform under the action of the hard valve plate of radial seal 16, and is fitted closely with 4 inner wall of the valve body and form sealing, sealing clamp
18 can rotate or sealing clamp 18 does not rotate respectively with valve rod 2.
The hard valve plate 16 of radial seal includes discoid bottom and columned raises up to be formed from the bottom
Lug boss, the sealing clamp 18 and the soft valve plate of lateral seal 17 are discoid, and are laminated and are sleeved on the radial seal
On the lug boss of hard valve plate 16.
The bottom surface of the valve rod 2 invaginates to form a groove 20, and the hard 16 columned lug boss of valve plate of radial seal is stretched
Enter in the groove 20, and can be slided up and down in the groove 20.The lug boss ring of the hard valve plate of the radial seal 16
The activity for being wound with circular ring shape promotes key 21, and the activity, which promotes key 21, can reduce the lug boss of the hard valve plate of radial seal 16 in valve
The frictional force generated when sliding in the groove 20 of 2 bottom of bar is surrounded with the limit steel of circular ring shape on the outer wall of 2 lower part of the valve rod
Ring 22, the limit steel loop 22 can prevent valve rod 2 from being screwed out out of valve body gland 7.The inner wall of 4 bottom of the valve body is equipped with one
The guide groove 23 of ring shape, it is described to sealing soft valve plate 17 in sealing clamp 18 when second seals structure 11 closes intake tunnel 3
Start to deform under the action of the hard valve plate of radial seal 16, and can into the guide groove 23 prolonged expansion.
Prevent the water in valve cavity 6 from being flowed out from valve body gland 7 first is equipped between the valve rod 2 and valve body gland 7
Sealing structure 10, first sealing structure 10 are cirque structure, including double O-ring seals 12 and setting in double O-shaped sealings
The bearing of 12 lower section of circle, double O-ring seals 12 and bearing are fixed on by sealing cover 8 between valve rod 2 and valve body gland 7.
The bearing includes bearing inner race 13, bearing retainer 14 and bearing outer ring 15, and the bearing inner race 13 is arranged in the bearing
The inner ring of retainer 14, the bearing outer ring 15 are arranged in the outer ring of the bearing retainer 14, and the valve rod 2 sequentially passes through institute
State double O-ring seals 12 and bearing.The handwheel 9 is fixed on the valve by the sealing fire hydrant by handwheel fixing screws 24
The top of bar 2.The lower end outer wall of the valve rod 2 is equipped with external screw thread, and the inner wall of the valve body gland 7 is equipped with and the outer spiral shell
The internal thread that line matches.The valve seat 1 and valve body 4 are integrally formed.
In fire extinguishing procedure, double O-ring seals 12, bearing inner race 13, bearing retainer 14 and the axis of the first sealing structure 10
Bearing outer-ring 15 not only plays the role of sealing, and water is prevented to be flowed out from valve body gland 7, and bearing inner race 13, bearing are kept
Frame 14 and bearing outer ring 15 also reduce the frictional resistance between valve rod 2 and valve body gland 7 so that user is easier valve rod 2
It is spun out from valve body gland 7.Equally, the circular circular ring shape activity of the lug boss of the hard valve plate of radial seal 16 promoted key 21 with
And radial-thrust bearing 19 can reduce second seals structure 11 and the frictional resistance in 2 relative rotational motion of valve rod so that the
The movement of two sealing structures 11 up and down becomes easier to, i.e., the double containment fire hydrant is easier to open and close.Fire extinguishing
After, when second seals structure 11, which moves downward, closes intake tunnel 3, the edge of the soft valve plate of lateral seal 17 being capable of guide
Prolonged expansion in slot 23 enhances the sealing effect of second seals structure 11 to play the role of secondary blocking and closing flow
Fruit.
Working principle of the present invention is as follows：
When putting out a fire using the present invention, rotary hose is connected to water outlet mouthpiece 5 first, then rotation hand wheel 9, drives valve
Bar 2 rotates so that valve rod 2 moves upwards, and then the hard valve plate of radial seal 16 of second seals structure 11 is driven to move upwards, i.e.,
The double containment fire hydrant is opened, then, the high pressure water flow from 11 lower section of second seals structure pours in valve along intake tunnel 3
In body cavity 6, flowed out from rotary hose for putting out a fire through water outlet mouthpiece 5.After fire extinguishing, negative direction rotation hand wheel 9 makes valve rod 2
It moves downward, and then second seals structure 11 is driven to playback downwards, to block intake tunnel 3, that is, close the double containment
Then fire hydrant disassembles rotary hose from water outlet mouthpiece 5, that is, complete entire water supply fire-fighting work.
The above is only a preferred embodiment of the present invention, it is not intended to restrict the invention, it is noted that for this skill
For the those of ordinary skill in art field, without departing from the technical principles of the invention, can also make it is several improvement and
Modification, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (7)
1. a kind of double containment fire hydrant, including valve seat (1), be set on the valve seat (1) intake tunnel (3), be set to
Valve body (4) above the valve seat (1), the valve rod (2) being set in the valve body (4), the one of the valve body (4)
Side is equipped with water outlet mouthpiece (5), and valve body (4) inner hollow forms valve cavity (6), the valve cavity (6) and water outlet mouthpiece
(5) be connected, be respectively arranged at the top and bottom of the valve body (4) the upper opening being connected with the valve cavity (6) and
Under shed, the under shed are connected with intake tunnel (3), it is characterised in that：Be equipped at the top of the valve body (4) with it is described
The compatible valve body gland (7) of upper opening, the valve body gland (7) are equipped with sealing cover (8), the valve rod (2) by
Valve body (4) stretches in valve cavity (6), and sequentially passes through sealing cover (8) and valve body gland (7), the valve rod
(2) have and be located at the external top of the valve body (4) and the relatively described top setting and stretch to the valve cavity (6)
Interior bottom end, the top are equipped with the handwheel (9) rotated with ovable valve stem (2), second seals structure are equipped in the under shed
(11), and the second seals structure can the relatively described under shed moved up and down along the moving direction of valve body, it is described second sealing
Structure (11) and the lower end of the valve rod (2) are slidably connected, and the second seals structure (11) includes the hard valve of radial seal
Plate (16), the soft valve plate of lateral seal (17) and sealing clamp (18), the sealing clamp (18) and the soft valve plate of lateral seal (17)
Stacking is placed on the hard valve plate of radial seal (16), and sealing clamp (18) top surface is provided with toroidal cavity, and the circular ring shape is recessed
It is provided with the radial-thrust bearing (19) for reducing frictional resistance between the valve rod (2) and sealing clamp (18) in slot, turns
Dynamic handwheel (9) the band ovable valve stem (2) is pressed down against sealing clamp (18), and the soft valve plate of lateral seal (17) is made to be pressed in sealing
Start to deform under the action of plate (18) and the hard valve plate of radial seal (16), and is fitted closely with the valve body (4) inner wall
And form sealing；Valve body (4) bottom is equipped with the guide groove of a ring shape with the soft valve plate of lateral seal (17) corresponding section
(23), when second seals structure (11) seals intake tunnel (3), the soft valve plate of lateral seal (17) is pressed in sealing
Start to deform under the action of plate (18) and the hard valve plate of radial seal (16), and to the guide groove (23) interior prolonged expansion；
Being equipped between the valve rod (2) and valve body gland (7) prevents the water in valve cavity (6) from being flowed from valve body gland (7)
The first sealing structure (10) gone out, including double O types sealing rings (12) and setting are below double O-ring seals (12)
Bearing, double O types sealing rings (12) and bearing are fixed on valve rod (2) and valve body gland by sealing cover (8)
(7) between；
The bearing includes bearing inner race (13), bearing retainer (14) and bearing outer ring (15), the bearing inner race
(13) setting is in the inner ring of the bearing retainer (14), and bearing outer ring (15) setting is in the bearing retainer
(14) outer ring, the valve rod (2) sequentially pass through double O types sealing rings (12) and bearing.
2. double containment fire hydrant according to claim 1, it is characterised in that：The hard valve plate of radial seal (16) packet
Include discoid bottom and cylindrical and raise up the lug boss to be formed from the bottom, the sealing clamp (18) and
The soft valve plate of lateral seal (17) is discoid, and is laminated and is sleeved on the lug boss of the hard valve plate of the radial seal (16)
On.
3. according to the double containment fire hydrant described in claim 2, it is characterised in that：The bottom surface invagination shape of the valve rod (2)
At a groove (20), the columned lug boss of the hard valve plate of radial seal (16) stretches into the groove (20), and the diameter
It can be slided up and down in the groove (20) to hard valve plate (16) is sealed.
4. according to the double containment fire hydrant described in claim 3, it is characterised in that：The hard valve plate of radial seal (16)
The activity that lug boss is surrounded with circular ring shape promotes key (21), and the limit of circular ring shape is surrounded on the outer wall of valve rod (2) lower part
Position steel loop (22).
5. according to the double containment fire hydrant described in claim 1, it is characterised in that：The handwheel (9) is fixed by handwheel
Screw (24) is fixed at the top of valve rod (2).
6. according to the double containment fire hydrant described in claim 1, it is characterised in that：On the lower end outer wall of the valve rod (2)
Equipped with external screw thread, the inner wall of the valve body gland (7) is equipped with the internal thread to match with the external screw thread.
7. according to the double containment fire hydrant described in claim 1, it is characterised in that：The valve seat (1) and valve body (4) one
It is body formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510753771.2A CN105351533B (en) | 2015-11-09 | 2015-11-09 | Double containment fire hydrant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510753771.2A CN105351533B (en) | 2015-11-09 | 2015-11-09 | Double containment fire hydrant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105351533A CN105351533A (en) | 2016-02-24 |
| CN105351533B true CN105351533B (en) | 2018-09-07 |
Family
ID=55327564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510753771.2A Active CN105351533B (en) | 2015-11-09 | 2015-11-09 | Double containment fire hydrant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105351533B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106924921B (en) * | 2017-04-10 | 2022-05-13 | 重庆科技学院 | Special quick open-close type fire hydrant for corridor |
| CN108867765A (en) * | 2018-07-24 | 2018-11-23 | 百安消防科技有限公司 | A kind of intelligence fire hydrant |
| CN109737224B (en) * | 2019-01-16 | 2019-11-29 | 中石化上海工程有限公司 | A kind of VOC tail gas water seal arrangement and water sealing method |
| CN116066627A (en) * | 2023-02-01 | 2023-05-05 | 江苏明江阀业有限公司 | Bellows governing valve with prevent blockking up function |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100393412B1 (en) * | 2000-12-06 | 2003-07-31 | 주식회사 육송 | hydrant valve |
| CN2492253Y (en) * | 2001-05-31 | 2002-05-22 | 姚平 | Quick fire hydrant |
| CN2527799Y (en) * | 2002-01-06 | 2002-12-25 | 戴纪良 | Stop valve |
| CN2682251Y (en) * | 2003-09-17 | 2005-03-02 | 吴军标 | Double-sealing piston valve |
| JP2008151333A (en) * | 2006-11-21 | 2008-07-03 | Kitaura Seisakusho:Kk | Pressure reducing valve with water stopping function |
| CN202337998U (en) * | 2011-09-06 | 2012-07-18 | 江西荣和特种消防设备制造有限公司 | Detachable pressure-regulating outdoor fire hydrant |
| CN205173497U (en) * | 2015-11-09 | 2016-04-20 | 中铁电气化局集团北京建筑工程有限公司 | Double containment fire hydrant |
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2015
- 2015-11-09 CN CN201510753771.2A patent/CN105351533B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN105351533A (en) | 2016-02-24 |
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