CN201382187Y - Fireproof check valve for exhaust duct of building - Google Patents
Fireproof check valve for exhaust duct of building Download PDFInfo
- Publication number
- CN201382187Y CN201382187Y CN200920150912U CN200920150912U CN201382187Y CN 201382187 Y CN201382187 Y CN 201382187Y CN 200920150912 U CN200920150912 U CN 200920150912U CN 200920150912 U CN200920150912 U CN 200920150912U CN 201382187 Y CN201382187 Y CN 201382187Y
- Authority
- CN
- China
- Prior art keywords
- fire prevention
- prevention valve
- valve body
- gravity rod
- fire
- 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.)
- Expired - Lifetime
Links
Images
Landscapes
- Check Valves (AREA)
Abstract
The utility model discloses a fireproof check valve for an exhaust duct of a building. The check valve comprises a fireproof valve body, a fireproof valve seat and a check valve plate; the fireproof valve body is fixed in the fireproof valve seat; the check valve plate is movably connected to the inner part of the fireproof valve body; and the check valve plate overturns or drops to communicate or close a channel of the exhaust duct behind the fireproof valve seat. The check valve is characterized in that a thermo-sensitive sheet is arranged on the fireproof valve seat above the back part of the check valve plate; the fireproof valve seat behind the fireproof valve body is hinged with one end of a gravity rod; an deformed elastic device is arranged at the hinged part of the gravity rod and the fireproof valve body; the other end of the gravity rod is propped up by the thermo-sensitive sheet; and while being heated, the thermo-sensitive sheet fuses or deforms, the elastic device returns to the original shape, the gravity rod falls down, and the check valve plate drops to close the fireproof valve body. The check valve disclosed by the utility model has a simple structure, enables the gravity rod to fall down rapidly and press the gravity rod on the check valve plate tightly, and firmly seals the fireproof valve body, so that the channel between the building shared exhaust duct and the fireproof valve body can be safely closed.
Description
Technical field
The utility model relates to a kind of building air exhausting device, particularly relates to the building air exhaust channel fire-preventing check valve of the air outlet flue of a kind of residential housing kitchen and toilet.
Background technique
Existing building is provided with shared air exhaust channel, each layer kitchen, toilet are connected with shared air exhaust channel respectively, in order to prevent that the foul smell in the shared air exhaust channel from recharging, be equipped with safety check between each kitchen, toilet and the shared air channel, simultaneously, when preventing other floor breaking out of fires, pyrotechnics in the shared air exhaust channel pours in down a chimney into this chamber, family, and NBS also requires at this position fire-closing valve to be set, when the breaking out of fire of other rooms, automatic-closing valve prevents fire spread.The structure more complicated that existing building air exhaust channel fire-preventing check valve has, the closing motion that has is insensitive.Fire-preventing check valve generally all is to be made of non-return valve block and fire prevention valve body and fire prevention valve seat, and when other floor breaking out of fires, the safety check sheet falls and seal the fire prevention valve body, makes pyrotechnics can not spread and pour in down a chimney into indoor.A kind of fire-preventing check valve of structure wherein, for using a fixedly end of gravity rod of hot melt sheet at the rear of non-return valve block, the other end of gravity rod is movably connected on the fire prevention valve seat, after hot melt sheet chance hot melt is disconnected, gravity rod falls under the effect of self gravitation, and then the non-return valve block depressed sealing fire prevention valve body.Prevent that pyrotechnics from spreading and pour in down a chimney effect into this family though such fire-preventing check valve can play,, fall slow and flameproof effect is not good especially because the general weight of gravity rod is low weight.
Summary of the invention
The utility model is finished in order to solve deficiency of the prior art, the purpose of this utility model provide a kind of simple in structure, can make that gravity rod falls rapidly, and gravity rod is pressed on the non-return valve block tightly, sealing fire prevention valve body, and then the shared air exhaust channel of secure closed building securely and indoor between the building air exhaust channel fire-preventing check valve of path.
A kind of building air exhaust channel fire-preventing check valve of the present utility model, comprise the fire prevention valve body, fire prevention valve seat and non-return valve block, described fire prevention valve body is fixed in the described fire prevention valve seat, described non-return valve block is movably connected in the described fire prevention valve body, described non-return valve block overturns or falls the path that is communicated with or seals the air exhaust channel of described fire prevention valve seat rear connection, fire prevention valve seat in top, described non-return valve block rear portion is provided with heat-sensitive sheet, an end of a hinged gravity rod on the described fire prevention valve body rear fire prevention valve seat, described gravity rod and described fire prevention valve body hinged place are provided with the elastic device of deformation, described heat-sensitive sheet supports the other end of described gravity rod, described heat-sensitive sheet is met the disconnected or distortion of hot melt, described elastic device restores to the original state, described gravity rod falls, and described safety check slabbing is the described fire prevention valve body of sealing down.
A kind of building air exhaust channel fire-preventing check valve of the present utility model can also be:
Described elastic device is a torsion spring, and described gravity rod end around the axle of described torsion spring counterclockwise or turn clockwise.
Described fire prevention valve body rear fire prevention valve seat is provided with the pin-joint piece that stretches out, it is hinged that bolt or screw or screw are passed through in described pin-joint piece and described gravity rod end, described torsion spring one end is fixed on the outer fire prevention valve seat of pin-joint piece, and the other end of described torsion spring is fixed on the gravity rod.
Described pin-joint piece rear is provided with fixed plate, and described fixed plate is provided with cambered way, and described gravity rod is provided with sliding bar, and described sliding bar slides along described slideway, and described bolt or screw or screw pass fixed plate, gravity rod end, torsion spring successively.
Described heat-sensitive sheet is hot melt sheet or thermal distortion sheet, and it is disconnected that described heat-sensitive sheet is met hot melt, and it is softening that described thermal distortion sheet is met thermal distortion, and described thermal distortion sheet cooling restores to the original state.
Described heat-sensitive sheet one end is fixed on the described fire prevention valve seat, and the described heat-sensitive sheet the other end is fixed on the described gravity rod.
Described fire prevention valve seat is provided with the support plate that stretches to central authorities, and described support plate is fixed by bolt, screw or screw and described heat-sensitive sheet one end, and the other end of described heat-sensitive sheet is fixed by bolt or screw or screw and described gravity rod.
Described fire prevention valve body rear is provided with guide channel.
The outer rim of described fire prevention valve seat is provided with plug side, and described plug side is pegged graft and is fixed in described mount inlet outside.
Upper half part level of described non-return valve block is provided with rotating shaft, described rotating shaft is rotatable to be connected on the described fire prevention valve body, the rotating shaft of described non-return valve block is positioned at the place ahead of described fire prevention valve body with top, and the following part of described non-return valve block rotating shaft is positioned at the rear of described fire prevention valve body.
A kind of building air exhaust channel fire-preventing check valve of the present utility model, in terms of existing technologies, because its top, non-return valve block rear portion fire prevention valve seat is provided with heat-sensitive sheet, an end of a hinged gravity rod on the fire prevention valve body rear fire prevention valve seat, gravity rod and fire prevention valve body hinged place are provided with the elastic device of deformation, and heat-sensitive sheet supports the other end of gravity rod, heat-sensitive sheet is met the disconnected or distortion of hot melt, elastic device restores to the original state, and gravity rod falls, and the safety check slabbing is sealing fire-closing valve body down.The building air exhaust channel fire-preventing check valve advantage of this spline structure has a restorable strength for the elastic device owing to deformation under the situation of heat-sensitive sheet fusing or distortion, the action of gravity drive gravity rod of this strength and gravity rod itself falls rapidly and the non-return valve block is against on the fire prevention valve body tightly, sealing fire prevention valve body, and then effectively prevent flue gas and fire spread and pour in down a chimney into indoor, and because the effect of elastic device, can seal the fire prevention valve body convenient, fast, safely, prevent to pour in down a chimney.
Description of drawings
A kind of building air exhaust channel of Fig. 1 the utility model fire-preventing check valve embodiment plan view.
A kind of building air exhaust channel of Fig. 2 the utility model fire-preventing check valve embodiment rear view.
Sectional view after a kind of building air exhaust channel of Fig. 3 the utility model fire-preventing check valve gravity rod falls.
A-A sectional view among a kind of building air exhaust channel of Fig. 4 the utility model fire-preventing check valve Fig. 1.
B portion enlarged view among a kind of building air exhaust channel of Fig. 5 the utility model fire-preventing check valve Fig. 3.
A kind of building air exhaust channel of Fig. 6 the utility model fire-preventing check valve is another embodiment's rear view again.
The figure number explanation
1 ... fire prevention valve seat 2 ... fire prevention valve body 3 ... non-return valve block 4 ... gravity rod
5 ... heat-sensitive sheet 6 ... guide channel 7 ... torsion spring 8 ... plug side
9 ... rotating shaft 10 ... fixed plate 11 ... sliding bar 12 ... slideway
Embodiment
Below in conjunction with accompanying drawing Fig. 1 to Fig. 6 building air exhaust channel fire-preventing check valve of the present utility model is described in further detail.
A kind of building air exhaust channel fire-preventing check valve of the present utility model please refer to relevant each figure among Fig. 1 to Fig. 6, comprises fire prevention valve body 2, fire prevention valve seat 1 and non-return valve block 3, and this is a structure member general in the fire-preventing check valve.Fire prevention valve body 2 is fixed in the fire prevention valve seat 1, non-return valve block 3 is movably connected in the fire prevention valve body 2, non-return valve block 3 overturns or falls and is communicated with or the shared air exhaust channel of building at closed valve seat rear and the path between the fire prevention valve body, when not having fire at ordinary times, in the time of need be by indoor outside air draft, the wind jack-up non-return valve block 3 of discharging makes the shared air exhaust channel of building at fire prevention valve seat 1 rear can be communicated with the indoor air draft of carrying out; When fire occurring, non-return valve block 3 falls, and the valve body 2 of will preventing fires seals, and then the path between indoor kitchen and toilet and the shared air exhaust channel of building is sealed.Fire prevention valve seat 1 in top, non-return valve block 3 rear portions is provided with heat-sensitive sheet 5, an end of a hinged gravity rod 4 on the fire prevention valve body 2 rears fire prevention valve seat 1, gravity rod 4 and fire prevention valve body 2 hinged places are provided with the elastic device of deformation, heat-sensitive sheet 5 supports the other end of gravity rod 4, heat-sensitive sheet 5 is met the disconnected or distortion of hot melt, elastic device restores to the original state, and gravity rod 4 falls, and non-return valve block 3 falls sealing fire prevention valve body 2.Like this because the elastic device of deformation has a restorable strength under the situation of heat-sensitive sheet 5 fusing or distortion, this strength adds that the gravity acting in conjunction drive gravity rod 4 of gravity rod falls rapidly and non-return valve block 3 is against on the fire prevention valve body 2 tightly, sealing fire prevention valve body 2, and then effectively prevent flue gas and fire spread and pour in down a chimney into indoor, and since elastic device and gravity act on simultaneously, can seal fire prevention valve body 2 convenient, fast, safely, prevent to pour in down a chimney.
A kind of building air exhaust channel fire-preventing check valve of the present utility model please refer among Fig. 1 to Fig. 6 relevant each figure, and concrete structure can be, elastic device is a torsion spring 7, and described gravity rod 4 ends around the axle of torsion spring 7 counterclockwise or turn clockwise.Torsion spring 7 is in rotation under the effect of restoring force and then drive gravity rod 4 and fall counterclockwise or after turning clockwise, and props up non-return valve block 3 and promptly makes it fall to be pressed on the fire prevention valve body 2 sealing fire prevention valve body 2.When installing, clockwise or rotate counterclockwise gravity rod 4 and make behind torsion spring 7 torsional deformations, act on can wait for next fire the time gravity rod 4 and heat-sensitive sheet 5 are fixing.Described concrete articulated manner is, fire prevention valve body 2 rears fire prevention valve seat 1 is provided with the pin-joint piece that stretches out, it is hinged that bolt or screw or screw are passed through in pin-joint piece and gravity rod 4 ends, and torsion spring 7 one ends are fixed on the outer fire prevention valve seat 1 of pin-joint piece, and the other end of torsion spring 7 is fixed on the gravity rod 4.Can also be that the pin-joint piece rear is provided with fixed plate 10, fixed plate 10 be provided with cambered way 12, and gravity rod 4 is provided with sliding bar 11, and sliding bar 11 slides along slideway 12, and bolt or screw or screw pass fixed plate 10, gravity rod end, torsion spring successively.Like this, after heat-sensitive sheet 5 chance hot melts broke or are out of shape, gravity rod 4 fell, and sliding bar 11 slides along slideway 12, drives gravity rod 4 and falls rapidly, seals the valve body 2 of preventing fires.
A kind of building air exhaust channel fire-preventing check valve of the present utility model, please refer to relevant each figure among Fig. 1 to Fig. 6, further heat-sensitive sheet 5 is the tinsel relatively more responsive to temperature specifically, heat-sensitive sheet 5 can be the hot melt sheet, it also can be the thermal distortion sheet, it is disconnected that the hot melt sheet is met hot melt, and it is softening that the thermal distortion sheet is met thermal distortion, and the cooling of thermal distortion sheet restores to the original state.When in use the temperature that runs into when the hot melt sheet reaches 150 ℃ (error ± 2 ℃) or 70 ℃ (error ± 2 ℃), the fusing of hot melt sheet, gravity rod 4 quickens to fall under the effect of torsion spring 7, be against on the non-return valve block 3, sealing fire prevention valve body 2, the shared air exhaust channel of building at sealing fire prevention valve seat 1 rear portion prevents that pyrotechnics from spreading and pour in down a chimney.The hot melt sheet that more renews then prevents to pour in down a chimney when next fire from taking place.And the thermal distortion sheet is when the temperature that runs into reaches 150 ℃ (error ± 2 ℃) or 70 ℃ (error ± 2 ℃), the distortion of thermal distortion sheet is softening, unclamped gravity rod 4, gravity rod 4 quickens to fall under the effect of torsion spring 7, be against on the non-return valve block 3, sealing fire prevention valve body 2 prevents that pyrotechnics from spreading and pour in down a chimney.Use the advantage of distortion sheet to be that it can resile automatically after cooling, can or support, make non-return valve block 3 air draft of can overturning gravity rod 4 pull-up again.The thermal distortion sheet that does not need more to renew can prevent to produce when next fire from taking place and pour in down a chimney.
A kind of building air exhaust channel fire-preventing check valve of the present utility model please refer to relevant each figure among Fig. 1 to Fig. 6, and heat-sensitive sheet 5 one ends are fixed on the fire prevention valve seat 1, and heat-sensitive sheet 5 the other ends are fixed on the gravity rod 4.Be specially fire prevention valve seat 1 and be provided with the support plate that stretches to central authorities, support plate is fixed by bolt, screw or screw and heat-sensitive sheet 5 one ends, and the other end of heat-sensitive sheet 5 is fixed by bolt or screw or screw and gravity rod 4.Certainly can also be other means of fixation, so long as can realize that by heat-sensitive sheet 5 gravity rod 4 being fixed on fire prevention gets final product on the valve seat 1.Further, rear at fire prevention valve body 2 is provided with guide channel 6, the effect of guide channel is that flue gas and foul smell are derived rapidly, comparative optimization be that guide channel 6 is the arc guide channel, the guide channel water conservancy diversion effect of arc is relatively good, indoor flue gas and foul smell can be entered in the shared air exhaust channel of building fast, concentrate to be discharged into roof.
A kind of building air exhaust channel fire-preventing check valve of the present utility model please refer to Fig. 1 to Fig. 6, and the outer rim of fire prevention valve seat 1 is provided with plug side 8, and plug side 8 is pegged graft and is fixed in the mount inlet outside, can not use screw to fix like this, mounts and dismounts more convenient.Non-return valve block 3 is a disk, and fire prevention valve body 2 is circular, and the internal diameter of fire prevention valve body 2 is less than the diameter of non-return valve block 3, and non-return valve block 3 can be with fire prevention valve body 2 complete closed.Upper half part level of non-return valve block 3 is provided with rotating shaft 9, and rotating shaft 9 is rotatable to be connected on the fire prevention valve body 2, and 3 rotating shafts 9 of non-return valve block are positioned at the place ahead of fire prevention valve body 2 with top, and the part of non-return valve block 3 rotating shafts 9 below is positioned at the rear of the valve body 2 of preventing fires.Be specially on fire prevention valve body 2 and be provided with the hole at rotating shaft 9 two end part, in the rotating shaft 9 two ends patchholes, rotating shaft 9 ends can rotate in the hole.
Above-mentionedly only several specific embodiments in the utility model are illustrated; but can not be as protection domain of the present utility model; every equivalence variation of having done according to the design spirit in the utility model or modification or equal proportion are amplified or are dwindled etc., all should think to fall into protection domain of the present utility model.
Claims (10)
1, a kind of building air exhaust channel fire-preventing check valve, comprise the fire prevention valve body, fire prevention valve seat and non-return valve block, described fire prevention valve body is fixed in the described fire prevention valve seat, described non-return valve block is movably connected in the described fire prevention valve body, described non-return valve block overturns or falls the path that is communicated with or seals the air exhaust channel at described fire prevention valve seat rear, it is characterized in that: fire prevention valve seat in top, described non-return valve block rear portion is provided with heat-sensitive sheet, an end of a hinged gravity rod on the described fire prevention valve body rear fire prevention valve seat, described gravity rod and described fire prevention valve body hinged place are provided with the elastic device of deformation, described heat-sensitive sheet supports the other end of described gravity rod, described heat-sensitive sheet is met the disconnected or distortion of hot melt, described elastic device restores to the original state, described gravity rod falls, and described safety check slabbing is the described fire prevention valve body of sealing down.
2, a kind of building air exhaust channel fire-preventing check valve according to claim 1, it is characterized in that: described elastic device is a torsion spring, described gravity rod end is around the axle of described torsion spring counterclockwise or turn clockwise.
3, a kind of building air exhaust channel fire-preventing check valve according to claim 2, it is characterized in that: described fire prevention valve body rear fire prevention valve seat is provided with the pin-joint piece that stretches out, it is hinged that bolt or screw or screw are passed through in described pin-joint piece and described gravity rod end, described torsion spring one end is fixed on the outer fire prevention valve seat of pin-joint piece, and the other end of described torsion spring is fixed on the gravity rod.
4, a kind of building air exhaust channel fire-preventing check valve according to claim 3, it is characterized in that: described pin-joint piece rear is provided with fixed plate, described fixed plate is provided with cambered way, described gravity rod is provided with sliding bar, described sliding bar slides along described slideway, and described bolt or screw or screw pass fixed plate, gravity rod end, torsion spring successively.
5, according to claim 1 or 2 or 3 or 4 described a kind of building air exhaust channel fire-preventing check valves, it is characterized in that: described heat-sensitive sheet is hot melt sheet or thermal distortion sheet, it is disconnected that described heat-sensitive sheet is met hot melt, and it is softening that described thermal distortion sheet is met thermal distortion, and described thermal distortion sheet cooling restores to the original state.
6, a kind of building air exhaust channel fire-preventing check valve according to claim 5, it is characterized in that: described heat-sensitive sheet one end is fixed on the described fire prevention valve seat, and the described heat-sensitive sheet the other end is fixed on the described gravity rod.
7, a kind of building air exhaust channel fire-preventing check valve according to claim 6, it is characterized in that: described fire prevention valve seat is provided with the support plate that stretches to central authorities, described support plate is fixed by bolt, screw or screw and described heat-sensitive sheet one end, and the other end of described heat-sensitive sheet is fixed by bolt or screw or screw and described gravity rod.
8, a kind of building air exhaust channel fire-preventing check valve according to claim 5, it is characterized in that: described fire prevention valve body rear is provided with guide channel.
9, a kind of building air exhaust channel fire-preventing check valve according to claim 5, it is characterized in that: the outer rim of described fire prevention valve seat is provided with plug side, and described plug side is pegged graft and is fixed in described mount inlet outside.
10, a kind of building air exhaust channel fire-preventing check valve according to claim 5, it is characterized in that: upper half part level of described non-return valve block is provided with rotating shaft, described rotating shaft is rotatable to be connected on the described fire prevention valve body, the rotating shaft of described non-return valve block is positioned at the place ahead of described fire prevention valve body with top, and the following part of described non-return valve block rotating shaft is positioned at the rear of described fire prevention valve body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920150912U CN201382187Y (en) | 2009-04-27 | 2009-04-27 | Fireproof check valve for exhaust duct of building |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920150912U CN201382187Y (en) | 2009-04-27 | 2009-04-27 | Fireproof check valve for exhaust duct of building |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201382187Y true CN201382187Y (en) | 2010-01-13 |
Family
ID=41525662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920150912U Expired - Lifetime CN201382187Y (en) | 2009-04-27 | 2009-04-27 | Fireproof check valve for exhaust duct of building |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201382187Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102679522A (en) * | 2012-05-31 | 2012-09-19 | 苏州盟通利机电设备有限公司 | Self-locking self-drooping air door structure |
| CN109751437A (en) * | 2017-11-07 | 2019-05-14 | 宁波方太厨具有限公司 | A kind of fireproof check valve for flue with double valve sheet |
| CN111059328A (en) * | 2019-12-30 | 2020-04-24 | 宁波方太厨具有限公司 | Fireproof check valve for range hood |
-
2009
- 2009-04-27 CN CN200920150912U patent/CN201382187Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102679522A (en) * | 2012-05-31 | 2012-09-19 | 苏州盟通利机电设备有限公司 | Self-locking self-drooping air door structure |
| CN102679522B (en) * | 2012-05-31 | 2014-12-17 | 苏州盟通利机电设备有限公司 | Self-locking self-drooping air door structure |
| CN109751437A (en) * | 2017-11-07 | 2019-05-14 | 宁波方太厨具有限公司 | A kind of fireproof check valve for flue with double valve sheet |
| CN109751437B (en) * | 2017-11-07 | 2024-01-16 | 宁波方太厨具有限公司 | Flue fireproof check valve with double valve plates |
| CN111059328A (en) * | 2019-12-30 | 2020-04-24 | 宁波方太厨具有限公司 | Fireproof check valve for range hood |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201382187Y (en) | Fireproof check valve for exhaust duct of building | |
| CN101608702B (en) | Check fire valve for flue | |
| CN201486107U (en) | Fireproof check valve of exhaust duct of storied building | |
| CN107101012B (en) | Fireproof plug valve for gas pipeline | |
| CN203453554U (en) | Fireproof check valve of exhaust pipe opening of range hood | |
| CN201521685U (en) | Fireproof check valve with guiding device | |
| CN210687151U (en) | Oil smoke discharging fireproof check valve with front and back double control | |
| CN205479533U (en) | Grease proofing cigarette flows backward check valve | |
| CN107489794A (en) | A kind of oil-smoke-exhausting fireproof check valve | |
| CN203248797U (en) | Flue non-return fire damper | |
| CN207246494U (en) | A kind of monolithic valve fireproof check valve for flue | |
| CN201487315U (en) | Fireproof check valve with ejector | |
| CN201443628U (en) | Flue fire-resisting-resisting check valve | |
| CN207268320U (en) | A kind of oil-smoke-exhausting fireproof check valve | |
| CN106178341A (en) | A kind of Simple fire retarding device of check valve | |
| CN202719235U (en) | Flue check valve | |
| CN207621442U (en) | A kind of single valve piece fireproof check valve for flue | |
| CN114791048A (en) | Check valve | |
| CN201496628U (en) | Smoke/fire-preventing one-way valve in flues | |
| CN108488445A (en) | A kind of fire-preventing check valve | |
| CN209876073U (en) | Fireproof check valve for oil smoke exhaust | |
| CN203023573U (en) | Fireproof flue check valve | |
| CN111720606A (en) | High-sealing fireproof check valve | |
| CN108518489B (en) | A kind of fire-fighting smoke exhaust fire damper being easily installed | |
| CN207527092U (en) | A kind of new-type fire-preventing check valve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100113 |
|
| CX01 | Expiry of patent term |