CN106609859A - An air-tight seal ball valve - Google Patents
An air-tight seal ball valve Download PDFInfo
- Publication number
- CN106609859A CN106609859A CN201510699514.5A CN201510699514A CN106609859A CN 106609859 A CN106609859 A CN 106609859A CN 201510699514 A CN201510699514 A CN 201510699514A CN 106609859 A CN106609859 A CN 106609859A
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- Prior art keywords
- valve
- pressure
- pressure bladder
- bladder
- air
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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
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- 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
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/12—Covers for housings
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- 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
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/04—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having cylindrical surfaces; Packings therefor
- F16K5/0457—Packings
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- 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
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/04—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having cylindrical surfaces; Packings therefor
- F16K5/0457—Packings
- F16K5/0464—Packings in the housing
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- 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
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/08—Details
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
Abstract
The invention provides an air-tight seal ball valve comprising a valve body, a valve rod, a valve cover and a valve element. The valve element is located in the valve body; the valve body is inside provided with two first air inflation channels; two sealed air bags A are installed in the valve body and are correspondingly connected to air outlets of the first air inflation channels; the valve element is provided with two annular grooves C which are corresponding to the sealed air bags A and act cooperatively with the same to form a sealing surface; the valve cover is fixed on the valve body; a sealed air bag B is arranged between the valve cover and the valve rod; the sealed air bag B cooperates with the valve cover and the valve rod to form a sealing surface. The valve is good in sealing effect and high in reliability. The air-tight seal ball valve has the advantages that the torque for opening and closing the valve is small, the valve element can rotate easily without friction when the valve is opened and closed and alarm can be given when hydraulic pressure is too high.
Description
Technical field
The present invention relates to valve manufacture field, particularly a kind of hermetic seal ball valve.
Background technology
In China, ball valve is widely used in industries such as petroleum refining, long-distance transport pipes, chemical industry, papermaking, pharmacy, water conservancy, electric power, municipal administration, iron and steel, and very important status is occupied in national economy.Ball valve has the features such as flow resistance is little in the case of simple structure, reliability, standard-sized sheet, therefore, the performance of ball valve is continued to improve also has very big positive role to the production of society.
General ordinary ball valve is all to be extruded the sealing surface for being formed mutually by metal and metal, during open and close ball valve, the torque of needs is larger, and very big torque ability smoothly open and close ball valve is particularly needed in relatively large ball valve is opened, and so just seem aborning excessive cumbersome；And for ordinary ball valve, easily occurring leakage between valve rod and valve gap, medium, if pumped (conveying) medium has corrosivity, can also be damaged from spouting along valve rod to the operator of valve, therefore, the sealing between valve rod and valve seat needs improvement；And valve sealing and ball valve after repeatedly opening, easily there is the not tight situation of ball valve sealing, liquid particularly in conveying contains small solid particle, these solid particles will cause valve element more severe with valve seat rubs mutually, Jing is needed often to change valve seat therefrom, the normal production of enterprise can thus be delayed, particularly in the conveying stronger to some Korrosionsmediums, the sealing of valve plays pivotal role to the safety for producing；When fluid pressure is too high in valve, Producer is often not aware that, often results in pipeline breaking, it is therefore desirable to which one kind being capable of valve with alarm too high to fluid pressure.
The content of the invention
For the problem that above-mentioned ball valve is present, the technical purpose of the present invention is to provide a kind of sealing of sealing effectiveness more preferably, between valve gap and valve rod tighter valve, can be used on the higher place of the reliability requirement to valve, solve the problems, such as conventional valves during pumped (conveying) medium easily occur reveal, this hermetic seal ball valve this be also a kind of controlled valve torque it is little, opening and closing valve when valve element can easily without frictional rotation, can it is excessive to fluid pressure and report to the police hermetic seal ball valve.
The present invention is achieved through the following technical solutions：
A kind of hermetic seal ball valve, including valve body, valve rod, valve gap, valve element and pressure bladder, the valve element is provided with two filling channels one in valve body in the valve body, two pressure bladder A are installed, the pressure bladder A is correspondingly connected to the gas outlet of filling channel one in the valve body；The valve element is provided with two cannelure C, and the cannelure C is corresponding with pressure bladder A and interaction forms sealing surface；Valve gap is fixed with the valve body, pressure bladder B is provided between the valve gap and valve rod, the pressure bladder B works in coordination to form sealing surface with valve gap, valve rod.
Due to said structure, two filling channels one are provided with valve body wall, two described filling channels are arranged symmetrically, and the pressure bladder A filling channels one corresponding with valve body installed in valve body are connected so that the pressure bladder A in valve body can be inflated by filling channel one；Offer two cannelure C on valve element, respectively corresponding pressure bladder A works in coordination and forms two seals face for two cannelure C, reaches the effect of sealing；In addition to sealing is needed between valve body and valve element, sealing is also required between valve gap and valve rod, generally this is easily ignored, therefore, pressure bladder B is provided between valve gap and valve rod, pressure bladder B interacts with valve gap, valve rod and forms sealing surface, so allows for all realizing hermetic seal with pressure bladder B between valve element and valve body, between valve gap and valve rod.
A kind of hermetic seal ball valve, air inlet is offered on the flange outer wall at the valve body two ends, the filling channel one connects air inlet with pressure bladder A, the air inlet pipe of the air inlet connection is provided with air gauge, the air inlet pipe is connected with air valve, and the air gauge is used to measure the atmospheric pressure value in pressure bladder A.
Due to said structure; air inlet is provided with two flange outer walls; the pressure bladder A in valve body can be inflated by this air inlet; and the air valve installed on air inlet can be after compressor be shut down; the air pressure in pressure bladder A is set to keep stable; and open air valve and the gas in pressure bladder A is discharged; play a part of pressure release; air gauge between air inlet and air valve can detect the atmospheric pressure value in pressure bladder A; when gas has leakage; the atmospheric pressure value read in air gauge just may know that, so be easier to overhaul valve.
A kind of hermetic seal ball valve, the pressure bladder material is compounded rubber material, and the wall thickness of the pressure bladder answers >=1mm, its section to be ellipse.
Due to said structure, the material of pressure bladder is compounded rubber material, high pressure can be born, and have good wearability energy and ruggedness, in order to ensure the ruggedness of pressure bladder, in order to ensure the reliability of pressure bladder, its thickness Ying Gai≤1mm, in order that sealing tight between valve body and valve element, the cross sectional shape of pressure bladder is ellipse.
A kind of hermetic seal ball valve, the filling channel（7）Section be a diameter of 5-20mm circle.
Due to said structure, the filling channel cross sectional shape being provided with valve body wall and valve gap is circle, and circular section can make pressure bladder be more easy to be connected and easier to process with inflation trachea.
A kind of hermetic seal ball valve, the valve element is provided with two cannelures, and the cannelure C is arranged symmetrically with the centrage of valve rod 2, and the cannelure C places plane is parallel with flange sealing surface.
Due to said structure, the two cannelure C set on valve element, when valve element is in the closed position, cannelure C is arranged symmetrically with the centrage of valve rod, pressure bladder A is after aerating, pressure bladder A can be engaged with valve element, and a part of pressure bladder A is stretched in cannelure C and expansion in cannelure C, makes valve seal good.
A kind of hermetic seal ball valve, filling channel two is provided with the valve gap, the inwall of the valve gap is provided with annular groove, the pressure bladder B is placed in annular groove, the pressure bladder B is communicated with filling channel two, and the filling channel two connects air inlet with pressure bladder B, and the air inlet pipe of the air inlet connection is provided with air gauge, the air inlet pipe is connected with air valve, and the air gauge is used to measure the atmospheric pressure value in pressure bladder A.
Due to said structure, the filling channel two being provided with valve gap is connected with pressure bladder B, valve gap inner cylinder face is provided with groove, this groove is used for placing pressure bladder, pressure bladder connects filling channel, filling channel can be inflated to pressure bladder, and the pressure bladder after inflation cooperatively forms sealing surface with the cannelure D on valve rod；The air valve installed on valve gap can give pressure bladder inflation/deflation, and air gauge can in real time show the atmospheric pressure value in pressure bladder, read atmospheric pressure value and just can know that pressure bladder either with or without gas leakage or breakage.
A kind of hermetic seal ball valve, tells that stem lower portion is provided with cannelure D, and the pressure bladder B can simultaneously be located at contact in annular groove and cannelure D and form sealing.
Due to said structure, the bottom of valve rod is provided with cannelure D, pressure bladder B is expanded in the annular groove of valve gap and cannelure D after the pressurizing and is formed sealing surface.
A kind of hermetic seal ball valve, is provided with pressure transducer 1 and pressure transducer 2 in the valve body, the pressure transducer 1 and pressure transducer 2 are respectively positioned at the porch and exit of valve flowing channel；The pressure value for measuring is passed to MCU by the pressure transducer 1,2 respectively, the MCU is connected with alarm, inflation mechanism, the MCU is calculated again to the atmospheric pressure value of pressure bladder A, B inflation according to the pressure value for measuring, and the atmospheric pressure value is the optimal atmospheric pressure value of sealed valve.
Due to said structure, after the pressure value that the pressure value that MCU measures pressure transducer 1 is measured with pressure transducer 2 compares, calculate to the optimal atmospheric pressure value to pressure bladder A, B inflation, and the signal of this atmospheric pressure value is sent to into inflation mechanism, inflation mechanism is optimum pressure value to the atmospheric pressure value that pressure bladder A, B pressurize；When the fluid pressure in valve becomes big/change hour, MCU sends a signal to inflation mechanism, so that optimum pressure value in pressure bladder A, B become it is big/diminish, when fluid pressure is too high in valve, when wanting seal ball-valve to want to have exceeded its rated pressure to the pressure of pressure bladder A, B inflation, MCU sends alarm signal to alarm, and alarm sends warning.
The invention has the beneficial effects as follows:
1st, it is provided with pressure bladder in valve body and in valve gap, cannelure is provided with valve element and valve rod, thus valve can be caused when closed, there is two seals face at valve element, valve rod also form a layer sealing surface with valve cover chamber, just more preferably, the sealing between valve gap and valve rod is tighter for such sealing effectiveness.
When valve is opened, the pressure bladder in valve body is without air pressure, and the pressure bladder in valve gap has sealing air pressure, therefore when valve is opened, also airtight front cover can be formed between valve gap and valve rod so that the more reliable performance of valve, solves the problems, such as that revealing easily occur during pumped (conveying) medium in conventional valves.
2nd, before open and close valve, first the gas in pressure bladder is bled off, then carrys out rotation valve rod and open and close valve, such valve element just can easily without frictional rotation, and such Open valve also being capable of easy manipulation using the torque of very little.
3rd, due to being provided with pressure transducer, MCU, alarm and external inflation mechanism, therefore pressure bladder A, B to hermetic seal ball valve in atmospheric pressure value can be adjusted according to the liquid pressure value in valve, warning can be sent when fluid pressure is excessive in valve.
Description of the drawings
Fig. 1 is the structural representation of the present invention.
Labelling in figure：1 is valve body, 2 is valve rod, 3 is valve gap, 4 is valve element, 5 is pressure bladder, 6 is cannelure, 7 is filling channel, 8 is air valve, 9 is air gauge.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention is described in detail.
A kind of hermetic seal ball valve as shown in Figure 1, including valve rod 1, valve rod 2, valve gap 3, valve element 4, pressure bladder 5, cannelure 6, filling channel 7, air valve 8, air gauge 9, the valve element 4 is characterized in that in valve body 1：Two filling channels 7 are provided with the valve body 1, the section of the filling channel 7 is the circle of a diameter of 5-20mm, two pressure bladders 5 are installed in the valve body 1, the material of the pressure bladder 5 is compounded rubber material, the wall thickness of the pressure bladder 5 is 3mm, and the section of pressure bladder 5 is ellipse
Described two pressure bladders 5 are correspondingly connected to the gas outlet of filling channel 7 in valve body；The valve element 4 is provided with two cannelures 6, and two on the valve element cannelure 6 is arranged symmetrically with the centrage of valve rod 2, and with two pressure bladders 5 in valve body interacts to form sealing surface respectively, and the cannelure C places plane is parallel with flange sealing surface；Air inlet is offered on the flange outer wall at the two ends of the valve body 1, two filling channels 7 in the valve body connect air inlet with the pressure bladder 5 in valve, the air inlet pipe of the air inlet connection is provided with air gauge 9, the air inlet pipe is connected with air valve 8, and the air gauge 9 is used to measure the atmospheric pressure value in pressure bladder 5；Valve gap 3 is fixed with the valve body 1, pressure bladder 5 is provided between the valve gap 3 and valve rod 2, the bottom of the valve rod 2 is provided with cannelure 6, the pressure bladder 5 in valve gap can simultaneously be located at contact in annular groove and cannelure 6 and form sealing surface；Filling channel 7 is provided with the valve gap 3, annular groove is provided with the inwall of the valve gap 3, pressure bladder 5 in the valve gap 3 is placed in annular groove and connects with the filling channel 7 in valve gap 3, filling channel 7 in the valve connects air inlet with the pressure bladder 5 in valve, the air inlet pipe of the air inlet connection on the valve gap 3 is provided with air gauge 9, the air inlet pipe is connected with air valve 8, and the air gauge 9 on the valve gap is used to measure the atmospheric pressure value in the pressure bladder 5 in valve body.
Pressure transducer 1 and pressure transducer 2 are provided with the valve body 1, the pressure transducer 1 and pressure transducer 2 are located at respectively at the entrance and exit of valve flowing channel；The pressure value P 1, P2 for measuring is passed to MCU by the pressure transducer 1,2 respectively, works as P1>During P2, the optimal atmospheric pressure value to pressure bladder A, B inflation is 1.5 times of P1, works as P2>During P1, the optimal atmospheric pressure value to pressure bladder A, B inflation is 1.5 times of P2；When the liquid in valve becomes P1' by P1, P2 becomes P2', P1'>During P2', it is 1.5P1' that MCU is calculated to the optimum pressure value of pressure bladder A, B inflation, and the pressure value signal of 1.5P1' is sent to into inflation mechanism, the optimum pressure value that inflation mechanism is adjusted in pressure bladder A, B is changed into 1.5P1', when the liquid in valve becomes P1' by P1, P2 becomes P2', P2'>During P1', the optimum pressure value that inflation mechanism is adjusted in pressure bladder A, B is changed into 1.5P2'；When fluid pressure is too high in valve, the maximum pressure-bearing of seal ball-valve is P0, to fully seal ball valve to the pressure that pressure bladder A, B are inflated is 0.95 times of P0When, MCU sends alarm signal to alarm, and alarm sends warning.
The hermetic seal ball valve of the present invention, is realized by following steps：
1, when needing to close valve, using air valve 9 first by valve gap 3, the gas in pressure bladder 5 in valve body 1 bleeds off, rotating valve handss handle, valve element 4 is set to rotate 90 ° and be in closing valve location, valve element 4 is after closing valve location, open all air valves 9, pressure value P 1 and P2 that MCU is passed back according to pressure transducer, calculate optimum pressure value P for completely closing valve to the inflation of pressure bladder 5 in valve gap 3 and in valve body 1, the signal of optimum pressure value P is simultaneously passed to inflation mechanism by MCU, inflation mechanism is optimum pressure value P to the atmospheric pressure value of the inflation of pressure bladder 5 in valve gap 3 and in valve body 1, fully seal valve.
2nd, when needing to open valve, the gas in two pressure bladders 5 in valve body is discharged with an air valve 9 on two air valves 9 and valve gap 3 on valve body 1, is rotated further by handle so that valve rod 2 rotates 90 ° with movable valve plug 4, now valve element 4 is in a fully open position；If after opening valve, there is pumped (conveying) medium in valve, now the pressure bladder 5 in valve gap 3 can be inflated, this makes it possible in medium course of conveying, make to form hermetic seal between valve rod 2 and valve gap 3, reach better seal fruit, and the reliability of valve is also improved.
3rd, when fluid pressure is too high in valve, the maximum pressure-bearing of seal ball-valve is P0, to fully seal ball valve to the pressure that pressure bladder A, B are inflated is 0.95 times of P0SWhen, MCU sends alarm signal to alarm, and alarm sends warning.
Claims (8)
1. a kind of hermetic seal ball valve, including valve body（1）, valve rod（2）, valve gap（3）And valve element（4）, the valve element（4）Located at valve body（1）It is interior, it is characterized in that：The valve body（1）Inside it is provided with two filling channels one, the valve body（1）Two pressure bladder A are inside installed, the pressure bladder A is correspondingly connected to the gas outlet of filling channel one；The valve element（4）Two cannelure C are provided with, the cannelure C is corresponding with pressure bladder A and interaction forms sealing surface；The valve body（1）On be fixed with valve gap（3）, the valve gap（3）With valve rod（2）Between be provided with pressure bladder B, the pressure bladder B and valve gap（3）, valve rod（2）Work in coordination to form sealing surface.
2. hermetic seal ball valve according to claim 1, is characterized in that, the valve body（1）Air inlet is offered on the flange outer wall at two ends, the filling channel one connects air inlet with pressure bladder A, the air inlet pipe of the air inlet connection is provided with air gauge（9）, the air inlet pipe and air valve（8）It is connected, the air gauge（9）For measuring pressure bladder（5）In atmospheric pressure value.
3. hermetic seal ball valve according to claim 2, is characterized in that, pressure bladder (5) material be compounded rubber material, the pressure bladder（5）Wall thickness should >=1mm, pressure bladder（5）Section for ellipse.
4. hermetic seal ball valve according to claim 3, is characterized in that, the filling channel（7）Section be a diameter of 5-20mm circle.
5. hermetic seal ball valve according to claim 4, is characterized in that, the cannelure C is with valve rod（2）Centrage be arranged symmetrically, the cannelure C places plane is parallel with flange sealing surface.
6. hermetic seal ball valve according to claim 5, is characterized in that, the valve gap（3）Inside it is provided with filling channel two, the valve gap（3）Inwall on be provided with annular groove, the pressure bladder B is placed in annular groove, and the pressure bladder B is communicated with filling channel two, and the filling channel two connects air inlet with pressure bladder B, and the air inlet pipe of air inlet connection is provided with air gauge（9）, the air inlet pipe and air valve（8）It is connected, the air gauge（9）Atmospheric pressure value in for measuring pressure bladder A.
7. hermetic seal ball valve according to claim 6, is characterized in that, the valve rod（2）Bottom is provided with cannelure D, and the pressure bladder B can simultaneously be located at contact in annular groove and cannelure D and form sealing.
8. hermetic seal ball valve according to claim 7, is characterized in that, the valve body（1）Pressure transducer 1 and pressure transducer 2 are inside provided with, the pressure transducer 1 and pressure transducer 2 are located at respectively at the entrance and exit of valve flowing channel；The pressure value for measuring is passed to MCU by the pressure transducer 1,2 respectively, the MCU is connected with alarm, inflation mechanism, the MCU is calculated again to the atmospheric pressure value of pressure bladder A, B inflation according to the pressure value for measuring, and the atmospheric pressure value is the optimal atmospheric pressure value of sealed valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510699514.5A CN106609859A (en) | 2015-10-26 | 2015-10-26 | An air-tight seal ball valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510699514.5A CN106609859A (en) | 2015-10-26 | 2015-10-26 | An air-tight seal ball valve |
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| Publication Number | Publication Date |
|---|---|
| CN106609859A true CN106609859A (en) | 2017-05-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510699514.5A Pending CN106609859A (en) | 2015-10-26 | 2015-10-26 | An air-tight seal ball valve |
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| CN (1) | CN106609859A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108194651A (en) * | 2017-12-25 | 2018-06-22 | 合肥恒力装备有限公司 | A kind of sealed valve |
| CN109404557A (en) * | 2018-12-20 | 2019-03-01 | 启东市冶金机械有限公司 | Flexible sealing pulverized coal spraying ball valve |
| CN110686091A (en) * | 2019-08-21 | 2020-01-14 | 宁波日安精工机械有限公司 | Pneumatic solenoid valve spool for industrial braking equipment |
| CN111550419A (en) * | 2020-05-15 | 2020-08-18 | 杭州余杭特种风机有限公司 | High-sealing coal gas pressurizing centrifugal blower |
| CN112246183A (en) * | 2020-11-10 | 2021-01-22 | 福州闽海药业有限公司 | High-efficient wet granulator that sealing performance is good |
| CN113503377A (en) * | 2021-09-10 | 2021-10-15 | 江苏中研宜普科技有限公司 | High-efficiency sealing valve of heat storage combustion device |
-
2015
- 2015-10-26 CN CN201510699514.5A patent/CN106609859A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108194651A (en) * | 2017-12-25 | 2018-06-22 | 合肥恒力装备有限公司 | A kind of sealed valve |
| CN108194651B (en) * | 2017-12-25 | 2020-03-03 | 合肥恒力装备有限公司 | Sealing valve |
| CN109404557A (en) * | 2018-12-20 | 2019-03-01 | 启东市冶金机械有限公司 | Flexible sealing pulverized coal spraying ball valve |
| CN110686091A (en) * | 2019-08-21 | 2020-01-14 | 宁波日安精工机械有限公司 | Pneumatic solenoid valve spool for industrial braking equipment |
| CN111550419A (en) * | 2020-05-15 | 2020-08-18 | 杭州余杭特种风机有限公司 | High-sealing coal gas pressurizing centrifugal blower |
| CN111550419B (en) * | 2020-05-15 | 2022-03-15 | 杭州余杭特种风机有限公司 | High-sealing coal gas pressurizing centrifugal blower |
| CN112246183A (en) * | 2020-11-10 | 2021-01-22 | 福州闽海药业有限公司 | High-efficient wet granulator that sealing performance is good |
| CN113503377A (en) * | 2021-09-10 | 2021-10-15 | 江苏中研宜普科技有限公司 | High-efficiency sealing valve of heat storage combustion device |
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Legal Events
| Date | Code | Title | Description |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170503 |
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| WD01 | Invention patent application deemed withdrawn after publication |