CN204784940U - Boiler lime -ash emission control valve and control valve structure that is used for discharging lime -ash - Google Patents
Boiler lime -ash emission control valve and control valve structure that is used for discharging lime -ash Download PDFInfo
- Publication number
- CN204784940U CN204784940U CN201520476496.XU CN201520476496U CN204784940U CN 204784940 U CN204784940 U CN 204784940U CN 201520476496 U CN201520476496 U CN 201520476496U CN 204784940 U CN204784940 U CN 204784940U
- Authority
- CN
- China
- Prior art keywords
- valve seat
- control valve
- ash
- lime
- valve structure
- 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
- 238000007599 discharging Methods 0.000 title claims abstract description 10
- 235000008733 Citrus aurantifolia Nutrition 0.000 title abstract 7
- 235000011941 Tilia x europaea Nutrition 0.000 title abstract 7
- 239000004571 lime Substances 0.000 title abstract 7
- 239000012530 fluid Substances 0.000 claims abstract description 7
- 230000029058 respiratory gaseous exchange Effects 0.000 claims description 24
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 229910052863 mullite Inorganic materials 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 239000013049 sediment Substances 0.000 abstract 3
- 230000000903 blocking effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000002742 anti-folding effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Landscapes
- Lift Valve (AREA)
Abstract
The utility model relates to a boiler lime -ash field of discharging discloses a boiler lime -ash emission control valve and control valve structure that is used for discharging lime -ash. The control valve structure includes valve chamber (1), be formed with row sediment passageway (2) in valve chamber (1), be provided with on the internal face of entry end (3) of row's sediment passageway (2) and be used for and case (4) complex disk seat (5), the control valve structure is still including running through valve chamber (1) and air flue (6) of disk seat (5), air flue (6) will arrange sediment passageway (2) and the outside fluid intercommunication of valve chamber (1). The emission flow of adjusting the lime -ash in control can be changeed to this control valve structure, prevents that the lime -ash from blockking up.
Description
Technical field
The utility model relates to boiler ash draining technology field, particularly, relates to a kind of control valve structure for discharging lime-ash, and a kind of boiler ash exhaust-control valve with this control valve structure.
Background technique
Circulating fluidized-bed boiler Combustion technology is a high-efficiency low-pollution clean-burning technology.Usually, to stabilize the economy operation in order to ensure boiler controller system, need the adjustment that the bed temperature to boiler, bed pressure etc. adapt to, the discharge amount of boiler ash controls to be then a key factor, namely, circulating fluidized-bed boiler Combustion technology controls to have higher requirement to the discharge amount of lime-ash.
Existing, most of circulating fluidized bed boiler mainly adopts the mechanical type Ash valve of Non-follow control or pneumatic control.This mechanical type Ash valve many employings cast steel and heat-resisting steels make flashboard, manually or the aperture of pneumatic adjustment flashboard, control the flow of lime-ash.But in lime-ash discharge process, because flashboard directly contacts lime-ash, the inner side surface of flashboard is subject to the direct impact of lime-ash, serious wear, further, lime-ash easily enters in the tracks gap of flashboard both sides, make flashboard jam, affect the adjustment of flashboard, cause the blocking of lime-ash.
Model utility content
The purpose of this utility model is to provide a kind of control valve structure for discharging lime-ash, and this control valve structure can be easier to the emission flow of regulating and controlling lime-ash, prevents lime-ash from blocking.
To achieve these goals, the utility model provides a kind of control valve structure for discharging lime-ash, this control valve structure comprises valve chamber, slagging channel is formed in described valve chamber, the internal face of the entry end of described slagging channel is provided with the valve seat for coordinating with spool, described control valve structure also comprises the air flue running through described valve chamber and described valve seat, and the external fluid of described slagging channel with described valve chamber is communicated with by described air flue.
Pass through technique scheme, air flue is had due to valve chamber and valve seat running through, the Single port of this air flue is positioned at the outside of described valve chamber, another port is formed on the internal surface of described valve seat, so that slagging channel is communicated with the external fluid of valve chamber, like this, in lime-ash discharge process, external air source can be used to pass through this air flue and to inject air-flow in slagging channel, this gas flow purging lime-ash also through the lime-ash flowed, carries out disturbance to lime-ash stream, lime-ash is more evacuated, thus be convenient to lime-ash flowing, effectively prevent the lime-ash blocking in slagging channel.
Preferably, described control valve structure comprises breathing pipe, and described breathing pipe runs through described valve chamber and described valve seat, and the Single port of described breathing pipe is positioned at the outside of described valve chamber, and another port extends to the internal surface of described valve seat, to form described air flue.
Further, the quantity of described breathing pipe is multiple, and uniform along described slagging channel circumference;
Described valve seat comprises the quantity valve seat lobe identical with described breathing pipe, and described valve seat lobe and described breathing pipe stationary positioned form described valve seat with mutual split.
Preferably, the air outlet of described air flue is formed in the entry position place of described valve seat.
Preferably, described valve seat is by the valve seat of mullite slurry injection forming.
Preferably, the inner chamber of described valve seat is formed as two arcuate shape that convex surface is radially-inwardly stretched along the cross section of its axial direction.
Further, the air outlet shape of described air flue is on the arcuate shape face at described valve seat entry position place.
Preferably, the Single port of described valve seat is formed as the described entry end of described slagging channel, and the internal face of the another port of described valve seat and the channel inner surface of described slagging channel are connected smoothly.
Preferably, the abrasion-proof and refractory layer that described valve chamber comprises housing, is arranged on the insulating on described inner walls face and is arranged on the internal surface of described insulating, forms described slagging channel in described abrasion-proof and refractory layer.
In addition, the utility model also provides a kind of boiler ash exhaust-control valve, this boiler ash exhaust-control valve comprises the valve rod of to-and-fro motion setting and above-described control valve structure, wherein, described valve rod is provided with spool, and described valve rod drives described spool coordinate with described valve base sealing or depart from.
Other features and advantages of the utility model are described in detail in embodiment part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide further understanding of the present utility model, and forms a part for specification, is used from explanation the utility model, but does not form restriction of the present utility model with embodiment one below.In the accompanying drawings:
Fig. 1 is the end elevation of the control valve structure that the utility model embodiment provides, and wherein, valve seat is in analyses and observe state;
Fig. 2 is the B-B cross-sectional schematic in Fig. 1, wherein, shows the spool driven by valve rod that can coordinate with valve seat.
Description of reference numerals
1-valve chamber, 2-slagging channel, 3-entry end, 4-spool, 5-valve seat, 6-air flue, 7-breathing pipe, 8-valve seat lobe, 9-air outlet, 10-housing, 11-insulating, 12-abrasion-proof and refractory layer, 13-valve rod, 14-fastening connection piece.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the utility model, is not limited to the utility model.
As illustrated in fig. 1 and 2, what the utility model provided comprises valve chamber 1 and air flue 6 for the control valve structure of discharging lime-ash, wherein, the slagging channel 2 for discharging boiler ash is formed in valve chamber 1, the internal face of the entry end 3 of slagging channel 2 is provided with valve seat 5, such as, valve seat 5 is positioned on the internal face of slagging channel 2 by reinforcing bar, plastics fastener etc., valve seat 5 is for being sealed and matched with spool 4, to prevent lime-ash from flowing automatically under stopping deslagging state, and air flue 6 runs through valve chamber 1 and valve seat 5 is formed, and the external fluid of slagging channel 2 with valve chamber 1 is communicated with by air flue 6.
Like this, air flue 6 is had due to valve chamber 1 and valve seat 5 running through, the Single port of this air flue 6 is positioned at the outside of described valve chamber 1, another port is formed on the internal surface of described valve seat 5, so that the external fluid of slagging channel 2 with valve chamber 1 is communicated with, like this, in lime-ash discharge process, external air source can be used to pass through this air flue 6 and to inject air-flow in slagging channel 2, this gas flow purging lime-ash also through the lime-ash flowed, carries out disturbance to lime-ash stream, lime-ash is more evacuated, thus be convenient to lime-ash flowing and discharge amount control, effectively prevent the lime-ash blocking in slagging channel.
In control valve structure of the present utility model, air flue 6 can be formed by structural type, such as, valve chamber 1 directly can run through and form passage to form a part for air flue 6, valve seat 5 then directly runs through and forms another passage to form another part of air flue 6, like this, when on the slagging channel 2 that valve seat 5 is fixedly assemblied in valve chamber 1, two-part passage docks to form overall air flue 6 mutually.
Certainly, selectively, for the ease of the connection of external air source, be easier to being fixedly connected with of valve seat 5 and valve chamber 1, preferably simultaneously, as illustrated in fig. 1 and 2, control valve structure of the present utility model also comprises breathing pipe 7, and this breathing pipe 7 runs through valve chamber 1 and valve seat 5, and the Single port of breathing pipe 7 is positioned at the outside of valve chamber 1, another port extends to the internal surface of valve seat 5, to form air flue 6.More preferably, the end face of breathing pipe 7 does not stretch out the internal surface of valve seat 5.Like this, breathing pipe 7 is communicated with slagging channel 2 and outside at fluid, while being convenient to lime-ash discharge, the effect of fastening valve seat 5 and slagging channel 2 can also be played, due to the barrier effect of reduction of fractions to a common denominator pipe 7, valve seat 5 effectively can be assisted to resist washing away of lime-ash, improve the reliability of location.
Further, as shown in Figure 1, for the ease of the assembling of valve seat 5, and improve the stream flower effect of lime-ash, preferably, the quantity of breathing pipe 7 is multiple, and uniform along slagging channel 2 circumference; Such as have four breathing pipes 7, and each other in 90 ° of layouts, meanwhile, valve seat 5 comprises the quantity valve seat lobe 8 identical with breathing pipe 7, valve seat lobe 8 and breathing pipe 7 stationary positioned form valve seat 5 with mutual split.Such as, the side end face of each valve seat lobe 8 is formed with a half bore, and valve seat lobe 8 is assemblied in the space between breathing pipe 7 respectively, like this, a half bore on the side end face of two valve seat lobes 8 will be fitted on corresponding breathing pipe 7, and meanwhile, valve seat lobe 8 is by mutually against being spliced to form Integral valve seat 5; Or the middle part of each valve seat lobe 8 is formed with penetration hole, like this, when assembling, the penetration hole of each valve seat lobe 8 is inserted on corresponding breathing pipe 7, meanwhile, valve seat lobe 8 by mutually against being spliced to form Integral valve seat 5.Like this, shaping and the assembling of valve seat 5 is easier to.
Certainly, in order to be more convenient for, air-flow carries out disturbance to lime-ash, and lime-ash is more evacuated, thus is convenient to lime-ash flowing and discharge amount control, preferably, as shown in Figure 2, the air outlet 9 of air flue 6 is formed in the entry position place of valve seat 5, namely, air outlet 9 is formed in the position of the close entry end 3 of slagging channel 2, like this, air-flow can very first time disturbance lime-ash, and what be more conducive to lime-ash helps stream.Certainly, also also can be formed with air outlet 9 in the position away from entry end 3 of valve seat 5, like this, in the passage of whole valve seat 5, stream can be helped to lime-ash.
In addition, under the rugged environment that high-temperature material long term wear is washed away, in order to effectively improve the wear resistance of valve seat 5, preferably, valve seat 5 of the present utility model is the valve seat adopting mullite slurry injection forming.Such as, with mould, valve seat can be divided into four pieces and carry out moulding by casting, then each valve seat lobe is placed in special baking machine and carries out high-temperature baking maintenance, to discharge valve seat lobe internal moisture, improve wear resistance and the anti-folding of high temperature of valve seat entirety, high temperature compression strength, make its thermal expansivity little, to improve working life significantly, such as, more than 6 years can be used.Certainly, further, when injection forming valve seat lobe, some wear-resisting auxiliary material can be increased therein, such as abrasion-resistant metal nail, silica sand etc., or mullite slurry and metalwork mixing can be poured into a mould, to improve the wear-resisting of valve seat, flushing resistance.
In addition, in order to improve the sealing of valve seat 5 under non-deslagging state of this control valve structure, preferably, as shown in Figure 2, the inner chamber of valve seat 5 is formed as two arcuate shape that convex surface is radially-inwardly stretched along the cross section of its axial direction, namely, the middle part radially-inwardly arc protrusion of valve seat 5 inner passage, like this, is spool 4 timing, the outer surface of spool 4 will be formed with arc projecting surface and coordinate closely, effectively to prevent lime-ash gravity flow in the non-discharge state.
In this case, further, as shown in Figure 2, air outlet 9 shape of air flue 6 is on the arcuate shape face at valve seat 5 entry position place, and namely, air outlet 9 is formed in described arc projecting surface on the side of the entry end 3 of slagging channel 2.Like this, under the assistance of arcuate shape, during lime-ash discharge, the air-flow of air flue 6 is more conducive to the fluidisation of lime-ash, and under the non-discharge state of lime-ash, the arc projecting surface with valve seat 5 is formed and is sealed and matched closely by spool 4.
In addition, help stream in order to lime-ash of being more convenient for, prevent lime-ash from blocking, as shown in Figure 2, preferably, the Single port of valve seat 5 is formed as the entry end 3 of slagging channel 2, and the internal face of the another port of valve seat 5 and the channel inner surface of slagging channel 2 are connected smoothly.Such as, one end of the internal surface of the arcuate shape of above-mentioned valve seat 5 is directly formed as entry end 3, the other end then with the channel inner surface smooth connection of slagging channel 2, thus be more conducive to lime-ash help stream.
In addition, in a kind of structural type of valve chamber 1, as illustrated in fig. 1 and 2, the abrasion-proof and refractory layer 12 that valve chamber 1 comprises housing 10, is arranged on the insulating 11 on housing 10 internal face and is arranged on the internal surface of insulating 11, slagging channel 2 is formed in abrasion-proof and refractory layer 12, such as, insulating 11 and abrasion-proof and refractory layer 12 can such as to be pressganged able-bodied men mutual assembling and positioning by fastening connection piece 14 simultaneously.
In addition, the utility model also provides a kind of boiler ash exhaust-control valve, as shown in Figure 2, this boiler ash exhaust-control valve comprises the valve rod 13 of to-and-fro motion setting and above-described control valve structure, wherein, valve rod 13 is provided with spool 4, valve rod 13 is sealed and matched by external motive device to-and-fro motion to be with movable valve plug 4 and valve seat 5 or to depart from.
Certainly, spool 4 and valve seat 5 must have good centering, and such as, concentricity preferably controls in 1mm.
Like this, owing to being entered into the disturbance of the air-flow in slagging channel 2 by air flue 6, this boiler ash exhaust-control valve can prevent lime-ash from blocking significantly, and effectively improve the flowing of lime-ash, good regulating and controlling effect is played to the discharge of lime-ash, meanwhile, also working life is extended significantly.
Below preferred implementation of the present utility model is described by reference to the accompanying drawings in detail; but; the utility model is not limited to the detail in above-mentioned mode of execution; within the scope of technical conceive of the present utility model; can carry out multiple simple variant to the technical solution of the utility model, these simple variant all belong to protection domain of the present utility model.
It should be noted that in addition, each the concrete technical characteristics described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode.In order to avoid unnecessary repetition, the utility model illustrates no longer separately to various possible compound mode.
In addition, also can carry out combination in any between various different mode of execution of the present utility model, as long as it is without prejudice to thought of the present utility model, it should be considered as content disclosed in the utility model equally.
Claims (10)
1. one kind for discharging the control valve structure of lime-ash, comprise valve chamber (1), slagging channel (2) is formed in described valve chamber (1), the internal face of the entry end (3) of described slagging channel (2) is provided with the valve seat (5) for coordinating with spool (4), it is characterized in that, described control valve structure also comprises the air flue (6) running through described valve chamber (1) and described valve seat (5), and the external fluid of described slagging channel (2) with described valve chamber (1) is communicated with by described air flue (6).
2. control valve structure according to claim 1, it is characterized in that, described control valve structure comprises breathing pipe (7), described breathing pipe (7) runs through described valve chamber (1) and described valve seat (5), and the Single port of described breathing pipe (7) is positioned at the outside of described valve chamber (1), another port extends to the internal surface of described valve seat (5), to form described air flue (6).
3. control valve structure according to claim 2, is characterized in that, the quantity of described breathing pipe (7) is multiple, and uniform along described slagging channel (2) circumference;
Described valve seat (5) comprises the quantity valve seat lobe (8) identical with described breathing pipe (7), and described valve seat lobe (8) and described breathing pipe (7) stationary positioned form described valve seat (5) with mutual split.
4. control valve structure according to claim 1, is characterized in that, the air outlet (9) of described air flue (6) is formed in the entry position place of described valve seat (5).
5. control valve structure according to claim 1, is characterized in that, described valve seat (5) is by the valve seat of mullite slurry injection forming.
6. control valve structure according to claim 1, is characterized in that, the inner chamber of described valve seat (5) is formed as two arcuate shape that convex surface is radially-inwardly stretched along the cross section of its axial direction.
7. control valve structure according to claim 6, is characterized in that, air outlet (9) shape of described air flue (6) is on the arcuate shape face at described valve seat (5) entry position place.
8. according to the control valve structure in claim 1-7 described in any one, it is characterized in that, the Single port of described valve seat (5) is formed as the described entry end (3) of described slagging channel (2), and the internal face of the another port of described valve seat (5) and the channel inner surface of described slagging channel (2) are connected smoothly.
9. control valve structure according to claim 1, it is characterized in that, the abrasion-proof and refractory layer (12) that described valve chamber (1) comprises housing (10), is arranged on the insulating (11) on described housing (10) internal face and is arranged on the internal surface of described insulating (11), forms described slagging channel (2) in described abrasion-proof and refractory layer (12).
10. a boiler ash exhaust-control valve, it is characterized in that, comprise to-and-fro motion arrange valve rod (13) and according to the control valve structure in claim 1-9 described in any one, wherein, described valve rod (13) is provided with spool (4), described valve rod (13) drives described spool (4) and described valve seat (5) are sealed and matched or depart from.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520476496.XU CN204784940U (en) | 2015-07-03 | 2015-07-03 | Boiler lime -ash emission control valve and control valve structure that is used for discharging lime -ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520476496.XU CN204784940U (en) | 2015-07-03 | 2015-07-03 | Boiler lime -ash emission control valve and control valve structure that is used for discharging lime -ash |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204784940U true CN204784940U (en) | 2015-11-18 |
Family
ID=54524989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520476496.XU Active CN204784940U (en) | 2015-07-03 | 2015-07-03 | Boiler lime -ash emission control valve and control valve structure that is used for discharging lime -ash |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204784940U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105757268A (en) * | 2016-05-19 | 2016-07-13 | 陈亮 | Ash valve |
-
2015
- 2015-07-03 CN CN201520476496.XU patent/CN204784940U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105757268A (en) * | 2016-05-19 | 2016-07-13 | 陈亮 | Ash valve |
| CN105757268B (en) * | 2016-05-19 | 2019-01-08 | 陈亮 | Ash valve |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| BR102013000283A2 (en) | discharge flow modifier, duct intersection incorporating the same and methods for the same | |
| CN204784940U (en) | Boiler lime -ash emission control valve and control valve structure that is used for discharging lime -ash | |
| CN101581385B (en) | High-temperature resistant air cooling smoke gate device | |
| CN205330918U (en) | Interior cold type compressor clearance tolerance governing system actuating mechanism | |
| CN201306476Y (en) | 2-position 3-way air reversing valve | |
| CN202082931U (en) | Integrated multiple low flow rate strand air single heat accumulating type nozzle | |
| CN207578961U (en) | A kind of hot nozzle of hydraulic type single-point needle valve | |
| CN216764684U (en) | Air injection device of glass kiln and glass kiln | |
| CN208331293U (en) | A kind of device adjusting cinder notch circulation area | |
| WO2012159324A1 (en) | Piston-type speed controller | |
| CN202057030U (en) | Atmospheric pressure vertical type boiler | |
| KR20160089901A (en) | valve system for a gas engine | |
| CN205243668U (en) | Can change cooling of valve portion, calorific loss and sealing performance's engine cylinder lid | |
| CN206409730U (en) | A kind of bypass line mixing arrangement | |
| CN201215314Y (en) | External thermal storage burner | |
| JP2008169788A (en) | Variable nozzle turbocharger and engine having it | |
| CN203847266U (en) | Double-EGR (Exhaust Gas Recirculation)-channel integrated engine cylinder cover | |
| CN102102766A (en) | Combustible and explosive liquid explosive feed valve | |
| CN207648195U (en) | A kind of high-temperature flue gas triple valve | |
| CN106676216B (en) | A method of for safeguarding industrial furnace cooling wall | |
| CN104963739B (en) | A kind of engine of the rotary gas supply-discharge system of band | |
| CN203559066U (en) | Blow-in taphole structure of blast furnace | |
| CN205618698U (en) | Lime -ash valve | |
| CN103644326A (en) | Two-stage buffer type anti-water-hammer coaxial valve | |
| CN201925945U (en) | No-blockage coaling mechanism |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |