CN108061164B - Method and device for preventing shaft sleeve of flap valve from feeding slag - Google Patents
Method and device for preventing shaft sleeve of flap valve from feeding slag Download PDFInfo
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- CN108061164B CN108061164B CN201711175097.XA CN201711175097A CN108061164B CN 108061164 B CN108061164 B CN 108061164B CN 201711175097 A CN201711175097 A CN 201711175097A CN 108061164 B CN108061164 B CN 108061164B
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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
- 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
- F16K1/16—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 with pivoted closure-members
- F16K1/18—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 with pivoted closure-members with pivoted discs or flaps
- F16K1/22—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 with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
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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
- 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
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Valves (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a method and a device for preventing shaft sleeves of a flap valve from feeding slag. The device comprises a valve body, a shaft sleeve, a valve shaft, a turning plate and a blowing device; the valve shaft penetrates through the valve body, and the turning plate is arranged on the valve shaft; the valve shaft penetrates through the outer parts of the two ends of the valve body and is respectively sleeved with shaft sleeves, and the purging device is respectively communicated with the shaft sleeves at the two ends of the valve shaft. The technical problem that the shaft sleeve of the flap valve is easy to feed slag to cause abrasion of the flap valve in the prior art is solved, and the technical effect of effectively preventing the shaft sleeve of the flap valve from feeding slag and further prolonging the service life of the flap valve is achieved.
Description
Technical Field
The invention belongs to the technical field of mechanical valve application, and particularly relates to a method and a device for preventing a shaft sleeve of a flap valve from slag feeding.
Background
At present, a blast furnace gas wet-method bilingual dust removal device mainly comprises a bilingual washing system, a washing water supply system, a water level control system, a sewage discharge treatment system, a relevant detection control system and the like.
After the blast furnace gas is dedusted by gravity, the blast furnace gas is distributed to a bilingual washing system by a raw gas main pipe. The raw gas is fully mixed and stirred with turbid circulating water in a wet gas washing system consisting of two sets of venturi tubes connected in series. The blast furnace gas and turbid circulating water form strong convection by utilizing the increase of the flow velocity at the throat part of the venturi, so that a large amount of fine dust carried in the gas is soaked in the water. The fine particles soaked by the water can not move along with the gas flow, and are carried into the water at the turning part (the lower part of the venturi) of the gas flow in the venturi, so that the particles in the gas are separated from the gas flow. The clean gas which is washed and purified by the two-stage venturi tubes is guided to a blast furnace pressure reducing valve bank or a TRT unit through a clean gas pipe at a bilingual outlet and is decompressed and then flows into a clean blast furnace gas dry pipe.
Turbid circulating water in the bilingual tower is collected at the lower part of the bilingual washing tower after participating in washing. Then the sewage is drained into a drainage square ditch of the washing system through a drainage turning plate controlled by the liquid level of the float box.
The duplex water drainage system (see attached figure 1) is an important component of a blast furnace gas wet dedusting system. And the water level detection of each venturi washing tower uses two sets of buoy box devices to be connected with the water storage cone part at the lower part of the venturi by using the principle of a communicating vessel. The drainage control uses two drainage turning plates which are connected with corresponding buoy boxes by using a crank arm and a valve shaft. The valve shaft device is driven by the change of the water level in the buoy box to control the opening and closing of the corresponding turning plate. The rising of the floating ball in the buoy box drives the turning plate to open, and the falling of the floating ball in the buoy box drives the turning plate to close.
The opening and closing moment of the flap is provided by the buoyancy generated by the float in the buoy box and the self weight of the flap, so the action moment of the flap valve cannot be too large. If the mechanical resistance of the turning plate is too large, the turning plate is blocked, and the floating buoy box cannot push the turning plate, so that the water level in the washing tower is out of control, and the safe operation of the bilingual washing system is influenced.
The flap valve adopts the form of turning over the board, uses circular valve plate to rotate around the pivot, relies on the turned angle of pivot to control the valve plate aperture, realizes the throttle control to working medium.
A rotating shaft in the flap valve serves as a rotating part of the valve, and a shaft sleeve and the rotating shaft are adopted to support and lubricate the rotating part. Because a large amount of high-hardness fine particles such as coal dust, iron powder and the like washed from coal gas are mixed in the discharged water of the blast furnace gas wet dust removal system. In the normal working process, the rotating shaft and the shaft sleeve which are soaked in the drained water inevitably carry partial fine particles along with the rotation of the rotating shaft. The high hardness fine particles entrained between the shaft and the sleeve cause wear on the contact surfaces. In severe cases, the shaft will be blocked and will not operate.
Along with the continuous deepening of the abrasion process, the gap between the rotating shaft of the flap valve and the shaft sleeve is enlarged, and more foreign bodies are brought into the enlarged gap by pressure drainage, so that the abrasion is further aggravated. Until the abrasion exceeds the limit, the seal on the shaft is broken down, and the valve leaks water. Or because the clearance is enlarged, the rotating shaft of the valve deflects under the action of an external driving force, so that the valve plate or the rotating shaft is clamped, and the regulation is failed.
Disclosure of Invention
In view of the above, the present invention has been made in order to provide a method and a device for preventing slag penetration of a sleeve of a flap valve that overcome or at least partially solve the above problems.
In a first aspect, an embodiment of the invention provides a method for preventing slag from entering a shaft sleeve of a flap valve, which comprises the following steps: the pressure maintaining medium purging devices are arranged on the shaft sleeves on the two sides of the flap valve, so that the pressure of the introduced pressure maintaining medium is higher than the pressure of a flowing medium in the drainage flap, a gap between the flap valve shaft and the shaft sleeves is purged, and slag is prevented from entering the inner part of the shaft sleeve of the flap valve.
Further, the purging device controls the ball valve to selectively introduce different pressure maintaining media or control the pressure of the introduced pressure maintaining media through the check valve according to the pressure value obtained by the pressure gauge, and performs micro-positive pressure purging on the internal gap between the valve shaft of the flap valve and the shaft sleeve.
Further, the pressure maintaining medium comprises an inert, harmless gas or liquid.
Further, the pressure maintaining medium is nitrogen or liquid nitrogen.
Furthermore, the purging device is installed through an opening in the flap valve shaft sleeve, and a pressure maintaining medium source connector is installed through a pressure maintaining medium source connector arranged on the purging device, so that the pressure maintaining medium is introduced.
The invention discloses a device for preventing a shaft sleeve of a flap valve from feeding slag, which comprises a valve body, a shaft sleeve, a valve shaft and a flap, and is characterized by also comprising a purging device; the valve shaft penetrates through the valve body, and the turning plate is arranged on the valve shaft; the valve shaft penetrates through the outer parts of the two ends of the valve body and is respectively sleeved with shaft sleeves, and the purging device is respectively communicated with the shaft sleeves at the two ends of the valve shaft.
Further, the purging device comprises 2 purging heads, a purging pipe, a pressure gauge, a one-way valve, a ball valve, a pressure maintaining medium source and a controller; the purging pipe comprises a main pipe and 2 branch pipes, one end of the main pipe is respectively communicated with the 2 branch pipes, the main pipe is sequentially provided with the pressure gauge, the one-way valve and the ball valve, and the other end of the main pipe is communicated with the pressure maintaining medium source; the 2 blowing heads are respectively arranged on shaft sleeves at two ends of the valve shaft, are respectively connected with the tail end of one branch pipe of the blowing pipe, and are respectively communicated with the pressure maintaining medium source through a main pipe of the blowing pipe; the controller is respectively electrically connected with the pressure gauge, the one-way valve and the ball valve and is used for acquiring the pressure value of the pressure gauge, controlling the ball valve to select whether to introduce a pressure maintaining medium or to control the pressure of the introduced pressure maintaining medium through the one-way valve according to the pressure value, and carrying out micro-positive pressure purging on the internal gap between the valve shaft and the shaft sleeve.
Further, the purging pipe is made of stainless steel materials.
Further, a pressure maintaining medium source connector is arranged on the purging pipe and used for installing the pressure maintaining medium source connector to realize the introduction of the pressure maintaining medium.
Furthermore, a plurality of pressure maintaining medium source interfaces are used for respectively accessing different pressure maintaining medium sources; the controller is respectively electrically connected with the pressure gauge, the one-way valve and the ball valve and is used for acquiring the pressure value of the pressure gauge, controlling the ball valve to selectively introduce different pressure maintaining media or control the pressure of the introduced pressure maintaining media through the one-way valve according to the pressure value, and carrying out micro-positive pressure purging on the internal gap between the valve shaft and the shaft sleeve.
The technical scheme provided in the embodiment of the application at least has the following technical effects or advantages:
the invention discloses a method and a device for preventing shaft sleeves of a flap valve from feeding slag. The device comprises a valve body, a shaft sleeve, a valve shaft, a turning plate and a blowing device; the valve shaft penetrates through the valve body, and the turning plate is arranged on the valve shaft; the purging device is communicated with the shaft sleeves at the two ends of the valve shaft respectively to purge an internal gap between the valve shaft and the shaft sleeves. The technical problem that the shaft sleeve of the flap valve is easy to feed slag to cause abrasion of the flap valve in the prior art is solved, and the technical effect of effectively preventing the shaft sleeve of the flap valve from feeding slag and further prolonging the service life of the flap valve is achieved.
Drawings
FIG. 1 shows a prior art twin scrubbing system drainage schematic;
FIG. 2 shows a schematic view of the structure of a flap valve according to an embodiment of the invention;
fig. 3 shows a schematic structural view of a flap valve equipped with a purging device according to an embodiment of the present invention.
Detailed Description
The invention provides a method and a device for preventing a shaft sleeve of a flap valve from feeding slag, which are used for solving the technical problem that the flap valve is abraded due to the fact that the shaft sleeve of the flap valve is easy to feed slag in the prior art, and achieve the technical effects of effectively preventing the shaft sleeve of the flap valve from feeding slag and further prolonging the service life of the flap valve.
In order to better understand the technical solutions of the present invention, the following detailed descriptions of the technical solutions of the present invention are provided with the accompanying drawings and the specific embodiments, and it should be understood that the specific features in the embodiments and the examples of the present invention are the detailed descriptions of the technical solutions of the present invention, and are not limitations of the technical solutions of the present invention, and the technical features in the embodiments and the examples of the present invention may be combined with each other without conflict.
The embodiment provides a method for preventing a shaft sleeve of a flap valve from slag feeding, which comprises the following steps: the shaft sleeves on the two sides of the flap valve are provided with the pressure maintaining medium purging devices, so that the pressure of the introduced pressure maintaining medium is higher than the pressure of a flowing medium in the drainage flap, a gap between the flap valve shaft and the shaft sleeve is purged, and slag in the shaft sleeve of the flap valve is prevented.
In the specific implementation process, the traditional flap valve is improved, the invention can be used in a drainage flap valve of a blast furnace gas wet dust removal system, and the sweeping devices are additionally arranged on the shaft sleeves on the two sides of the flap valve, so that the pressure of the introduced pressure maintaining medium is higher than the pressure of the flowing medium in the drainage flap valve, and the phenomenon that impurities such as slag easily enter a gap between the valve shaft of the flap valve and the shaft sleeve and are blocked or even deadly due to the opening and closing actions of the flap valve is avoided.
As an optional implementation manner, the purging device controls the ball valve to select to introduce different pressure maintaining media or to control the pressure of the introduced pressure maintaining media through the check valve according to a pressure value obtained by the pressure gauge, and performs micro-positive pressure purging on an internal gap between the valve shaft and the shaft sleeve of the flap valve.
In the specific implementation process, the pressure of the pressure maintaining medium is observed through a pressure gauge and controlled through a ball valve, and micro-positive pressure purging is performed on a possibly slag feeding part in the gap between the valve shaft of the flap valve and the shaft sleeve. Through micro-positive pressure purging, abrasion between a rotating shaft and a shaft sleeve of the flap valve is reduced, a gap of a rotating part of the flap valve is maintained, and dynamic sealing between the rotating shaft and the shaft sleeve is prevented from being punctured by pressure drainage; meanwhile, the resistance moment of the rotating part is ensured to be smaller than the maximum moment which can be provided by the buoy box, and the phenomena that the buoy box and the flap system are blocked and the regulation is out of order are avoided. The service life of the flap valve is prolonged to be longer than the damping down maintenance period of the blast furnace, and the maintenance workload of field equipment is reduced.
As an alternative embodiment, the pressure maintaining medium comprises an inert, non-hazardous gas or liquid.
In a specific implementation, an inert, non-hazardous gas or liquid at a pressure above the operating pressure may be used as a purge source, depending on the process. Nitrogen (or purified water with pressure higher than that of flowing medium in the drainage turnover plate) can be selected, inert harmless gas or liquid enters the system through the shaft sleeve, no chemical reaction occurs, no potential safety hazard exists even a small amount of inert harmless gas or liquid enters the drainage system, and the service life of the system is prolonged.
As an alternative embodiment, the pressure-maintaining medium is nitrogen or liquid nitrogen.
In the specific implementation process, the gas source can be nitrogen or liquid nitrogen, and the content of the nitrogen in the blast furnace gas reaches 55-60%, so that the introduced nitrogen does not react with the blast furnace gas, and the property of the blast furnace gas is not influenced by a small amount of nitrogen. And a small amount of nitrogen discharged along with the drainage cannot cause adverse effects on the field environment.
As an optional implementation manner, the purging device is installed on the flap valve shaft sleeve through an opening, and a pressure maintaining medium source connector is installed on the purging device through a pressure maintaining medium source connector, so that the pressure maintaining medium is introduced.
In the specific implementation process, the installation hole is formed in the flap valve shaft sleeve, and the purging device is installed, so that the purging device can be detached and separated from the system, and is convenient to replace and store.
In particular, the method is mainly used for, but not limited to, the blast furnace gas wet dedusting system drainage flap valve. It is within the scope of the claims to use the method of the present invention on any application system as long as the objectives of the present invention are achieved.
The embodiment of the invention also provides a device for preventing the shaft sleeve of the flap valve from feeding slag, which comprises a valve body, a shaft sleeve, a valve shaft, a flap plate and a blowing device; the valve shaft penetrates through the valve body, and the turning plate is arranged on the valve shaft in the valve body; the purging device is communicated with the shaft sleeves at the two ends of the valve shaft respectively to purge an internal gap between the valve shaft and the shaft sleeves.
In a specific implementation process, the invention improves the existing flap valve, and as shown in fig. 2, the improved flap valve comprises: the valve shaft 3 penetrates through the valve body 1, and the turning plate 4 is arranged on the valve shaft 3; the valve shaft 3 is sleeved with shaft sleeves 2 respectively through the outsides of two ends of the valve body 1. The purging device is arranged on the outer side of the shaft sleeve 2, is respectively communicated with the shaft sleeves 2 at two ends of the valve shaft 3, and purges an inner gap between the valve shaft and the shaft sleeves. Of course, the purging device of the invention is also applicable to the existing flap valve, and only needs to be communicated with the internal clearance between the valve shaft and the shaft sleeve of the flap valve.
In the invention, the purging device can be communicated with the valve shaft 3 through a through hole formed in the shaft sleeve 2. Of course, the purging device and the flap valve can be detached and separated and connected through an internal thread structure and an external thread structure.
Referring to fig. 3, as an alternative embodiment, the purging device includes two purging heads 6, a purging pipe 7, a pressure gauge 8, a check valve 9, a ball valve 10, and a pressure maintaining medium source 11;
the purging pipe comprises a main pipe and two branch pipes, wherein one end of the main pipe is respectively communicated with the 2 branch pipes, the main pipe is sequentially provided with the pressure gauge 8, the one-way valve 9 and the ball valve 10, and the other end of the main pipe is communicated with the pressure maintaining medium source 11;
the 2 blowing heads 6 are respectively arranged on shaft sleeves at two ends of the valve shaft 3, are respectively connected with the tail end of one branch pipe of the blowing pipe 7, and are respectively communicated with the pressure maintaining medium source 11 through a main pipe of the blowing pipe 7.
In specific implementation process, install on the flap valve both sides axle sleeve 2 and sweep device 5, observe and utilize check valve 9, ball valve 10 control to let in gas pressure or let in other higher inert medium of pressure according to control medium through manometer 8, the possible sediment position of perhaps advancing of flap valve shaft 3 and axle sleeve 2 internal gap can adopt gas or liquid pressure in a little positive pressure to sweep, realizes preventing the inside purpose of advancing the sediment of flap valve axle sleeve 2, avoids impurity such as sediment to get into the easy flap valve shaft 3 and axle sleeve 2 internal gap, and it is dead even to block the flap valve switching action formation jamming.
In order to save labor cost and more accurately control the purging device 5, the invention further comprises a controller, wherein the controller is respectively electrically connected with the pressure gauge 8, the one-way valve 9 and the ball valve 10 and is used for acquiring the pressure value of the pressure gauge 8, controlling the ball valve 10 to select whether to introduce a pressure maintaining medium or not according to the pressure value or controlling the pressure of the introduced pressure maintaining medium through the one-way valve 9, and performing micro-positive pressure purging on the internal gap between the valve shaft 3 and the shaft sleeve 2.
As an alternative embodiment, the purge tube is made of stainless steel.
In the specific implementation process, the purging device can be preferably made of stainless steel so as to avoid corrosion of the pressure maintaining medium and prolong the service life of the system.
As an optional implementation manner, a pressure maintaining medium source interface is arranged on the purge pipe, and is used for installing the pressure maintaining medium source connector to realize the introduction of the pressure maintaining medium.
In the specific implementation process, the pressure maintaining medium is introduced through the interface, so that the pressure maintaining medium is conveniently accessed, and the method is simple and rapid.
As an optional implementation manner, the pressure maintaining medium source interfaces are multiple and are used for respectively accessing different pressure maintaining medium sources; the controller is respectively electrically connected with the pressure gauge, the one-way valve and the ball valve and is used for acquiring the pressure value of the pressure gauge, controlling the ball valve to selectively introduce different pressure maintaining media or control the pressure of the introduced pressure maintaining media through the one-way valve according to the pressure value, and carrying out micro-positive pressure purging on the internal gap between the valve shaft and the shaft sleeve.
In the specific implementation process, the ball valves are respectively communicated with a plurality of pressure maintaining medium sources, the introduction of the pressure maintaining medium sources is controlled, and different inert harmless gases or liquids with pressure higher than the working pressure can be selected as purging sources according to the allowable conditions of the process. For example, nitrogen or purified water with a pressure higher than the flow medium in the drainage flap can be used. It should be noted that, for the working principle or the specific implementation method of the above-mentioned apparatus, reference may be made to the specific description of the method embodiment, which is not described herein again.
The technical scheme provided in the embodiment of the application at least has the following technical effects or advantages:
the invention discloses a method and a device for preventing shaft sleeves of a flap valve from feeding slag. The device comprises a valve body, a shaft sleeve, a valve shaft, a turning plate and a blowing device; the valve shaft penetrates through the valve body, and the turning plate is arranged on the valve shaft; the purging device is communicated with the shaft sleeves at the two ends of the valve shaft respectively to purge an internal gap between the valve shaft and the shaft sleeves. The technical problem that the shaft sleeve of the flap valve is easy to feed slag to cause abrasion of the flap valve in the prior art is solved, and the technical effect of effectively preventing the shaft sleeve of the flap valve from feeding slag and further prolonging the service life of the flap valve is achieved.
Those skilled in the art will appreciate that embodiments of the present invention provide methods in which all or a portion of the steps may be performed by hardware associated with program instructions. Such as may be accomplished by a computer running program. The program may be stored in a readable storage medium, such as a random access memory, a magnetic disk, an optical disk, or the like.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (3)
1. A device for preventing a shaft sleeve of a flap valve from feeding slag comprises a valve body, a shaft sleeve, a valve shaft and a flap, and is characterized by also comprising a purging device;
the valve shaft penetrates through the valve body, and the turning plate is arranged on the valve shaft;
the valve shaft penetrates through the outer parts of the two ends of the valve body and is respectively sleeved with shaft sleeves, and the purging devices are respectively communicated with the shaft sleeves at the two ends of the valve shaft;
the purging device comprises 2 purging heads, purging pipes, a pressure gauge, a one-way valve, a ball valve, a pressure maintaining medium source and a controller;
the purging pipe comprises a main pipe and 2 branch pipes, one end of the main pipe is respectively communicated with the 2 branch pipes, the main pipe is sequentially provided with the pressure gauge, the one-way valve and the ball valve, and the other end of the main pipe is communicated with the pressure maintaining medium source;
the 2 blowing heads are respectively arranged on shaft sleeves at two ends of the valve shaft, are respectively connected with the tail end of one branch pipe of the blowing pipe, and are respectively communicated with the pressure maintaining medium source through a main pipe of the blowing pipe;
the purging pipe is provided with a pressure maintaining medium source connector for installing the pressure maintaining medium source connector to realize the introduction of the pressure maintaining medium;
the pressure maintaining medium source interfaces are multiple and are used for being respectively connected with different pressure maintaining medium sources; the controller is respectively electrically connected with the pressure gauge, the one-way valve and the ball valve and is used for acquiring a pressure value of the pressure gauge, controlling the ball valve to select whether to introduce a pressure maintaining medium or not according to the pressure value, controlling the ball valve to select to introduce different pressure maintaining media or controlling the pressure of the introduced pressure maintaining medium through the one-way valve, and performing micro-positive pressure purging on an internal gap between the valve shaft and the shaft sleeve;
the pressure maintaining medium is liquid.
2. The apparatus of claim 1, wherein the purge tube is made of a stainless steel material.
3. A method for preventing slag from entering a shaft sleeve of a flap valve by using the device as claimed in claim 1 or 2,
the shaft sleeves on the two sides of the flap valve are provided with pressure maintaining medium purging devices, so that the pressure of the introduced pressure maintaining medium is higher than the pressure of a flowing medium in the drainage flap, a gap between the flap valve shaft and the shaft sleeves is purged, and slag is prevented from entering the inner part of the shaft sleeves of the flap valve;
the purging device controls the ball valve to select whether to introduce pressure maintaining media or to select to introduce different pressure maintaining media or controls the ball valve to select the pressure of the introduced pressure maintaining media through the check valve according to the pressure value obtained by the pressure gauge, and performs micro-positive pressure purging on the internal gap between the valve shaft and the shaft sleeve of the flap valve;
the purging device is installed through an opening in the flap valve shaft sleeve, and a pressure maintaining medium source connector is installed through a pressure maintaining medium source connector arranged on the purging device, so that the pressure maintaining medium is introduced;
the pressure maintaining medium is liquid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711175097.XA CN108061164B (en) | 2017-11-22 | 2017-11-22 | Method and device for preventing shaft sleeve of flap valve from feeding slag |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711175097.XA CN108061164B (en) | 2017-11-22 | 2017-11-22 | Method and device for preventing shaft sleeve of flap valve from feeding slag |
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| CN108061164A CN108061164A (en) | 2018-05-22 |
| CN108061164B true CN108061164B (en) | 2020-05-26 |
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| CN201711175097.XA Active CN108061164B (en) | 2017-11-22 | 2017-11-22 | Method and device for preventing shaft sleeve of flap valve from feeding slag |
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| CN110792839A (en) * | 2019-10-18 | 2020-02-14 | 河海大学 | Structure for realizing automatic control of two water storage pipe switches |
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| US9121513B1 (en) * | 2014-04-01 | 2015-09-01 | Yi-Ming Fan | Triple eccentric valve with symmetric drain-proof ring applied no normal force to valve seat |
| CN205868966U (en) * | 2016-04-29 | 2017-01-11 | 湖北中烟工业有限责任公司 | Filament cutter rotor sweeps device |
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| CN201129480Y (en) * | 2007-12-18 | 2008-10-08 | 中核苏阀科技实业股份有限公司 | Super high temperature flue gas butterfly valve |
| CN201697140U (en) * | 2010-06-17 | 2011-01-05 | 长沙贝尔环保节能设备有限公司 | Air shock-wave soot blowing system |
| CN202531861U (en) * | 2012-04-20 | 2012-11-14 | 电建阀门有限公司 | High-temperature butterfly valve with long service life |
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| CN108061164A (en) | 2018-05-22 |
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