A top-mounted ultra-low temperature butterfly valve that can be maintained online

Abstract

The present invention discloses a top-mounted ultra-low temperature butterfly valve which can be maintained online, and belongs to the technical field of butterfly valves. The valve body is arranged into a main valve body and two detachable auxiliary valve body structures, and valve plates corresponding to the positions of the two auxiliary valve bodies are installed on both sides of the valve stem. The arrangement of the two valve plates not only improves the sealing effect of the valve plates, but also cooperates with the two detachable auxiliary valve bodies to facilitate online disassembly of the auxiliary valve bodies to maintain the valve plates in the valve body. During the maintenance process, there is no need to remove the butterfly valve from the pipeline, and the normal use of the butterfly valve is not affected. In addition, a compensation cavity is provided inside the sealing cavity of the sealing ring on the valve body, and a cold expansion compensation layer is provided inside the compensation cavity which is tightly attached to the inner wall of the sealing ring. When working in a low temperature environment, the cold expansion compensation layer expands to a certain extent when it encounters cold, thereby pushing the sealing ring to be squeezed outward, effectively improving the sealing degree between the sealing ring and the valve plate, and the sealing effect between the valve body and the valve plate will not be affected by the shrinkage of the sealing ring.

Description

Technical Field

[0001] The present invention relates to the technical field of butterfly valves, and more particularly to a top-mounted ultra-low temperature butterfly valve capable of online maintenance. Background Art

[0002] A butterfly valve, also called a flap valve, is a simple regulating valve that can be used for the on-off control of low-pressure pipeline media. A butterfly valve is a valve whose closing member (valve disc or butterfly plate) is a disc that rotates around the valve axis to achieve opening and closing. It can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. It mainly plays the role of cutting off and throttling in pipelines.

[0003] The valve body and valve plate of ordinary sealed butterfly valves are an integral installation structure, that is, the valve plate is directly installed in the valve body. Once the valve leaks, it can only be repaired by removing the valve from the pipeline. Therefore, it cannot be repaired or replaced online, and it is difficult to perform maintenance on site without affecting the use of the valve.

[0004] Moreover, the sealing ring materials used in the prior art are mostly multi-layered sealing rings made of stainless steel and flexible graphite. Since flexible graphite is a soft non-metallic material and is not resistant to medium erosion, the sealing ring is easily damaged after the butterfly valve is used for a long time, thereby affecting the valve sealing performance. In severe cases, it will cause the valve seal to fail. Especially in ultra-low temperature environments, the sealing ring is prone to shrinkage due to cold. When the sealing ring shrinks, the sealing effect between the sealing ring and the inner wall of the valve body is greatly reduced.

[0005] To this end, we propose a top-mounted ultra-low temperature butterfly valve that can be maintained online to effectively solve some problems existing in the prior art. Summary of the invention

[0006] 1. Technical issues to be solved

[0007] In view of the problems existing in the prior art, the purpose of the present invention is to provide a top-mounted ultra-low temperature butterfly valve that can be maintained online. The valve body is arranged to be a main valve body and two detachable auxiliary valve body structures, and valve plates corresponding to the positions of the two auxiliary valve bodies are installed on both sides of the valve stem. The arrangement of the two valve plates not only improves the sealing effect of the valve plates, but also cooperates with the two detachable auxiliary valve bodies to facilitate online disassembly of the auxiliary valve bodies to maintain the valve plates in the valve body. During the maintenance process, there is no need to remove the butterfly valve from the pipeline, and the normal use of the butterfly valve is not affected. In addition, a compensation chamber is opened inside the sealing chamber of the sealing ring on the valve body, and a cold expansion compensation layer is arranged inside the compensation chamber, which is tightly attached to the inner wall of the sealing ring. When working in a low temperature environment, the cold expansion compensation layer expands to a certain extent when it encounters cold, thereby pushing the sealing ring to be squeezed outward, effectively improving the sealing degree between the sealing ring and the valve plate, and the sealing effect between the valve body and the valve plate will not be affected by the shrinkage of the sealing ring.

[0008] 2. Technical solution

[0009] To solve the above problems, the present invention adopts the following technical solutions.

[0010] A top-mounted ultra-low temperature butterfly valve which can be maintained online comprises a valve body and a valve stem rotatably installed in the valve body, a valve cover connected with the top end of the valve stem is installed on the valve body, a turntable is provided on one side of the valve cover, the valve body comprises a main valve body and auxiliary valve bodies embedded and installed on both sides of the bottom end of the main valve body, both sides of the bottom end of the main valve body are provided with arc-shaped embedded cavities for embedding and installing the auxiliary valve bodies, valve plates are fixedly installed on the left and right ends of the valve stem located inside the valve body, the two valve plates are respectively arranged corresponding to the positions of the two auxiliary valve bodies, sealing cavities corresponding to the positions of the valve plates are opened on both sides of the main valve body and on the inner side walls of the two auxiliary valve bodies, sealing rings located on the outer side of the valve plates are embedded and installed in the mutually connected sealing cavities, compensation cavities are opened on the inner walls of the plurality of sealing cavities, and the interiors of the compensation cavities are coated with cold expansion compensation layers.

[0011] Furthermore, the two auxiliary valve bodies are both arc-shaped connecting bodies, and connecting blocks are fixedly connected to the relative positions of the two arc-shaped connecting bodies and the main valve body. The upper and lower corresponding connecting blocks are connected by mounting bolts, and a sealing gasket is attached to the connecting position between the auxiliary valve body and the main valve body. The valve body is arranged into a main valve body and two detachable auxiliary valve bodies matching structure, and the two auxiliary valve bodies match two valve plates, so that when the auxiliary valve body is removed downward, the valve plate corresponding to its position can be inspected and maintained without affecting the normal closing use of the butterfly valve, so as to facilitate online maintenance of the butterfly valve.

[0012] Furthermore, an arc-shaped embedding cavity matching with the outer wall of the valve stem is provided on the relative inner walls of the two valve plates, and an arc-shaped fastening sleeve covering the outer wall of the valve stem is provided on both sides of the arc-shaped embedding cavity, and magnetic attraction layers that are magnetically attracted to each other are respectively attached to the relative side walls of the relatively arranged arc-shaped fastening sleeves. When the two valve plates are installed, the valve plates are embedded in the valve stem through the arc-shaped embedding cavity and the arc-shaped fastening sleeve, which is conducive to high-precision connection and fixation between the valve plates and the valve stem.

[0013] Furthermore, a connecting plate is fixedly connected to the side wall of one end of the valve plate away from the valve stem, and a plurality of locking grooves are provided on the side wall opposite to the valve stem. The corresponding locking grooves inside and outside are threadedly connected by locking screws. When the valve plate is embedded in the valve stem, a plurality of locking screws are used for mechanical connection to realize the installation of the two valve plates on the valve stem respectively. The two valve plates work together, which on the one hand effectively improves the performance of the butterfly valve and effectively plays an anti-seepage role. On the other hand, the two valve plates are symmetrically arranged. When online maintenance is required, the two valve plates are rotated to a closed state, and the auxiliary valve body is disassembled downward and front and back in turn, so that the two valve plates can be inspected front and back without removing the butterfly valve from the pipeline, and the use of the butterfly valve is not affected during the maintenance process.

[0014] Furthermore, the outer end wall of the locking groove on the connecting plate is filled with an anti-corrosion sealing plug, and the end faces of the valve plate and the connecting plate are coated with an anti-corrosion layer. The anti-corrosion sealing plug effectively plays a certain anti-corrosion role for the locking screws installed on the connecting plate.

[0015] Furthermore, the sealing ring is coated on the side wall of the valve plate near the outer end, and the sealing ring includes a shrinkage-resistant filling layer attached to the sealing cavity and a flexible sealing pad layer arranged at the outer end of the shrinkage-resistant filling layer. The flexible sealing pad layer cooperates with the shrinkage-resistant filling layer, so that the sealing ring has good strength in a low temperature environment, is not easily damaged by medium erosion, and extends its service life.

[0016] Furthermore, the shrinkage-resistant filling layer is made of glass fiber and insulating adhesive, and the mass ratio of the glass fiber and the insulating adhesive is 1:2. The glass fiber has excellent rigidity and strength, and combined with the super strong adhesion of the insulating adhesive, the sealing ring not only has super tensile strength and rigidity, but also can reduce shrinkage and improve low-temperature impact strength.

[0017] Furthermore, the cold expansion compensation layer includes an elastic extrusion layer embedded in the compensation cavity, the cold expansion layer is filled between the elastic extrusion layer and the compensation cavity, the outer end of the elastic extrusion layer is in contact with the shrinkage-resistant filling layer, and the cold expansion layer can have a certain expansion effect in a cold environment, thereby pushing the elastic extrusion layer to be squeezed toward the sealing ring, so that the sealing ring can maintain a high-strength sealing effect with the outer wall of the valve plate.

[0018] Furthermore, the elastic extrusion layer is made of a low-temperature resistant elastic sheet, and the outer end surface of the elastic extrusion layer is a wavy structure, which is configured to effectively exert multi-point extrusion force on the inner end wall of the sealing ring.

[0019] Furthermore, the cold expansion layer is made of a cold expansion material, and the cold expansion material is made of a 3D printed unique micro-lattice structure material, and the new material has a certain cold expansion effect.

[0020] 3. Beneficial effects

[0021] Compared with the prior art, the advantages of the present invention are:

[0022] (1) This scheme arranges the valve body into a main valve body and two detachable auxiliary valve body structures, and fixedly installs valve plates corresponding to the positions of the two auxiliary valve bodies on the left and right sides of the valve stem. The arrangement of the two valve plates not only improves the sealing effect of the valve plates after opening and closing, but also cooperates with the two detachable auxiliary valve bodies to facilitate the online disassembly of the auxiliary valve bodies and the maintenance of the two valve plates in the valve body. During the maintenance process, there is no need to remove the butterfly valve from the pipeline, and the normal closing and use of the butterfly valve is not affected. In addition, a compensation chamber is provided inside the sealing chamber of the sealing ring on the valve body, and a cold expansion compensation layer is provided inside the compensation chamber, which is closely attached to the inner wall of the sealing ring. When working in a low temperature environment, the cold expansion compensation layer expands to a certain extent when it is cold, thereby pushing the sealing ring outward for extrusion, effectively improving the sealing degree between the sealing ring and the valve plate, and will not affect the sealing effect between the sealing ring and the valve plate due to the shrinkage of the sealing ring.

[0023] (2) Both auxiliary valve bodies are arc-shaped connecting bodies. Connecting blocks are fixedly connected to the relative positions of the two arc-shaped connecting bodies and the main valve body. The corresponding upper and lower connecting blocks are connected by mounting bolts, and sealing gaskets are attached to the connecting parts of the auxiliary valve body and the main valve body. The valve body is arranged into a matching structure of the main valve body and two detachable auxiliary valve bodies. The two auxiliary valve bodies match the two valve plates. When the auxiliary valve body is disassembled downward, the valve plate corresponding to its position can be inspected and maintained without affecting the normal closing use of the butterfly valve, so as to facilitate online maintenance of the butterfly valve.

[0024] (3) The opposite inner walls of the two valve plates are provided with arc-shaped embedding cavities that match the outer wall of the valve stem. Both sides of the arc-shaped embedding cavities are provided with arc-shaped fastening sleeves that cover the outer wall of the valve stem. The opposite side walls of the arc-shaped fastening sleeves are respectively attached with magnetic layers that attract each other. When installing the two valve plates, the valve plates are embedded in the valve stem through the arc-shaped embedding cavities and the arc-shaped fastening sleeves, which is conducive to high-precision connection and fixation between the valve plates and the valve stem.

[0025] (4) A connecting plate is fixedly connected to the side wall of the valve plate at one end away from the valve stem. A plurality of locking grooves are provided on the side wall of the connecting plate opposite to the valve stem. The corresponding locking grooves inside and outside are threadedly connected by locking screws. When the valve plate is embedded in the valve stem, a plurality of locking screws are used for mechanical connection to realize the installation of the two valve plates on the valve stem respectively. The two valve plates work together, which, on the one hand, effectively improves the performance of the butterfly valve and effectively plays an anti-seepage role. On the other hand, the two valve plates are symmetrically arranged. When online maintenance is required, the two valve plates are rotated to a closed state, and the auxiliary valve body is disassembled downward and forward in turn, so that the two valve plates can be inspected front and back without removing the butterfly valve from the pipeline, and the use of the butterfly valve is not affected during the maintenance process.

[0026] (5) The outer end wall of the locking groove on the connecting plate is filled with an anti-corrosion sealing plug, and the end faces of the valve plate and the connecting plate are coated with an anti-corrosion layer. The anti-corrosion sealing plug effectively plays a certain anti-corrosion role for the locking screws installed on the connecting plate.

[0027] (6) The sealing ring is wrapped around the side wall of the valve plate near the outer end. The sealing ring includes a shrinkage-resistant filling layer attached to the sealing cavity and a flexible sealing pad layer arranged at the outer end of the shrinkage-resistant filling layer. The flexible sealing pad layer cooperates with the shrinkage-resistant filling layer so that the sealing ring has good strength in a low temperature environment, is not easily damaged by the erosion of the medium, and prolongs its service life.

[0028] (7) The shrinkage-resistant filling layer is made of glass fiber and insulating glue. The mass ratio of glass fiber to insulating glue is 1:2. The glass fiber has excellent rigidity and strength. Combined with the super strong adhesion of the insulating glue, the sealing ring not only has super tensile strength and rigidity, but also can reduce shrinkage and improve low-temperature impact strength.

[0029] (8) The cold expansion compensation layer includes an elastic extrusion layer embedded in the compensation cavity. The cold expansion layer is filled between the elastic extrusion layer and the compensation cavity. The outer end of the elastic extrusion layer is in contact with the shrinkage-resistant filling layer. The elastic extrusion layer is made of a low-temperature resistant elastic sheet. The outer end surface of the elastic extrusion layer has a wavy structure. The cold expansion layer is made of a cold expansion material. The cold expansion material uses a unique microlattice structure material obtained by 3D printing. This new material has a certain cold expansion effect. The cold expansion layer can have a certain expansion effect in a cold environment, thereby pushing the elastic extrusion layer to extrude toward the sealing ring. The expansion extrusion layer is set to a wavy structure, which effectively exerts a multi-point extrusion force on the inner end wall of the sealing ring, so that the sealing ring can maintain a high-strength sealing effect with the outer wall of the valve plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A perspective view of the present invention;

[0031] Figure 2 It is a partially exploded stereogram of the present invention;

[0032] Figure 3 The separation of the joint between the valve body and the valve plate of the present invention Figure 1 ;

[0033] Figure 4 The separation of the joint between the valve body and the valve plate of the present invention Figure 2 ;

[0034] Figure 5 A three-dimensional diagram of the junction between the valve plate and the valve stem of the present invention;

[0035] Figure 6 The valve plate and the valve stem of the present invention are separated Figure 1 ;

[0036] Figure 7 The valve plate and the valve stem of the present invention are separated Figure 2 ;

[0037] Figure 8 It is a partial cross-sectional view of the junction of the valve body and the valve plate of the present invention;

[0038] Fig. 9 It is a partial cross-sectional view of the junction of the sealing ring and the cold expansion layer of the present invention.

[0039] Description of the numbers in the figure:

[0040] 1 valve body, 101 main valve body, 102 auxiliary valve body, 2 valve cover, 3 valve stem, 4 valve plate, 401 connecting plate, 402 locking screw, 403 arc-shaped embedded cavity, 404 arc-shaped fastening sleeve, 5 sealing ring, 501 flexible sealing gasket layer, 502 shrinkage-resistant filling layer, 6 cold expansion layer, 7 elastic extrusion layer. DETAILED DESCRIPTION

[0041] The following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all the embodiments. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0042] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] Embodiment 1:

[0045] See also Figure 1-7 , a top-mounted ultra-low temperature butterfly valve that can be repaired online, includes a valve body 1 and a valve stem 3 rotatably installed in the valve body 1, a valve cover 2 connected to the top of the valve stem 3 is installed on the valve body 1, a turntable is provided on one side of the valve cover 2, and a driving structure for driving the valve stem 3 to rotate is provided inside the valve cover 2, the driving structure is connected to the turntable, so that the valve stem 3 can be rotated by operating the turntable. This is a prior art and will not be described in detail here. The valve body 1 includes a main valve body 101 and an auxiliary valve body 102 embedded and installed on both sides of the bottom end of the main valve body 101, both sides of the bottom end of the main valve body 101 are provided with an arc-shaped embedded cavity for the auxiliary valve body 102 to be embedded and installed, valve plates 4 are fixedly installed on the left and right ends of the valve stem 3 located inside the valve body 1, and the two valve plates 4 are respectively arranged corresponding to the positions of the two auxiliary valve bodies 102. When the auxiliary valve body 101 is disassembled 2, in order to facilitate online maintenance of the valve plate corresponding to the position thereof, the two auxiliary valve bodies 102 are both arc-shaped connecting bodies, and connecting blocks are fixedly connected to the relative positions of the two arc-shaped connecting bodies and the main valve body 101, and the upper and lower corresponding connecting blocks are connected by mounting bolts, and sealing gaskets are attached to the connecting parts of the auxiliary valve bodies 102 and the main valve body 101, and the valve body 1 is configured as a matching structure of the main valve body 101 and two detachable auxiliary valve bodies 102, and the two auxiliary valve bodies 102 match the two valve plates 4, so that when the auxiliary valve bodies 102 are disassembled downward, the valve plates 4 corresponding to the positions thereof can be repaired without affecting the normal closing use of the butterfly valve, so as to facilitate online maintenance of the butterfly valve, and when repairing one of the valve plates 4, the auxiliary valve body 102 at the other valve plate 4 is in a sealed state with the main valve body.

[0046] The opposite inner walls of the two valve plates 4 are provided with arc-shaped embedding cavities 403 that are embedded and matched with the outer wall of the valve stem 3, and arc-shaped fastening sleeves 404 that cover the outer wall of the valve stem 3 are provided on both sides of the arc-shaped embedding cavity 403. Magnetic attraction layers that attract each other are respectively attached to the opposite side walls of the relatively arranged arc-shaped fastening sleeves 404. The magnetic attraction layers that attract each other are provided to effectively improve the stable connection of the two valve plates 4 after embedding and installation. When installing the two valve plates 4, the valve plates 4 are embedded in the valve stem 3 through the arc-shaped embedding cavity 403 and the arc-shaped fastening sleeve 404, which is conducive to high-precision connection and fixation between the valve plates 4 and the valve stem 3. A connecting plate 401 is fixedly connected to the side wall of the valve plate 4 away from the valve stem 3, and a plurality of locking grooves are provided on the connecting plate 401 and the side wall opposite to the valve stem 3. The corresponding locking grooves inside and outside are threaded by locking screws 402 Connection. When the valve plate 4 is embedded in the valve stem 3, a plurality of locking screws 402 are used for mechanical connection to realize that the two valve plates 4 are respectively installed on the valve stem 3. The two valve plates 4 work together. On the one hand, it effectively improves the performance of the butterfly valve and effectively plays an anti-seepage role. On the other hand, the two valve plates 4 are symmetrically arranged. When online maintenance is required, the two valve plates 4 are rotated to a closed state, and the auxiliary valve body 102 is disassembled downward and forward in turn, so that the two valve plates 4 can be inspected front and back without removing the butterfly valve from the pipeline, and the use of the butterfly valve is not affected during the maintenance process. The outer end wall of the locking groove on the connecting plate 401 is filled with an anti-corrosion sealing plug, and the end faces of the valve plate 4 and the connecting plate 401 are coated with an anti-corrosion layer. The anti-corrosion sealing plug effectively plays a certain anti-corrosion role on the locking screws 402 installed on the connecting plate 401.

[0047] See also Figure 2-4 and Figure 8-9 , sealing cavities corresponding to the position of the valve plate 4 are opened on both sides of the main valve body 101 and the inner walls of the two auxiliary valve bodies 102, and a sealing ring 5 located on the outer side of the valve plate 4 is embedded and installed in the mutually connected sealing cavities, and the sealing ring 5 is covered on the side wall of the valve plate 4 near the outer end, and the sealing ring 5 includes a shrinkage-resistant filling layer 502 attached to the sealing cavity and a flexible sealing pad layer 501 arranged at the outer end of the shrinkage-resistant filling layer 502. The flexible sealing pad layer 501 cooperates with the shrinkage-resistant filling layer 502, so that the sealing ring 5 has good strength in a low temperature environment, is not easily damaged by medium erosion, and extends its service life. The shrinkage-resistant filling layer 502 is made of glass fiber and insulating glue, and the mass ratio of glass fiber to insulating glue is 1:2. The glass fiber has good rigidity and strength, and cooperates with the super strong adhesion of the insulating glue, so that the sealing ring 5 not only has super tensile strength and rigidity, but also can reduce shrinkage and improve low-temperature impact strength.

[0048] See also Figure 8-9, compensation cavities are provided on the inner walls of multiple sealing cavities, and the interiors of the compensation cavities are covered with cold expansion compensation layers. The cold expansion compensation layers include an elastic extrusion layer 7 embedded in the compensation cavity, and a cold expansion layer 6 is filled between the elastic extrusion layer 7 and the compensation cavity. The outer end of the elastic extrusion layer 7 is in contact with the shrinkage-resistant filling layer 502, and the elastic extrusion layer 7 is made of a low-temperature resistant elastic sheet. The outer end surface of the elastic extrusion layer 7 has a wavy structure, and the cold expansion layer 6 is made of a cold expansion material. The cold expansion material adopts a unique microlattice structure material of 3D printing. Technical personnel in this field can also choose any other material that can expand coldly. The new material has a certain cold expansion effect. The cold expansion layer 6 can have a certain expansion effect in a cold environment, thereby pushing the elastic extrusion layer 7 to extrude toward the sealing ring 5, and the elastic extrusion layer 7 exerts a multi-point extrusion force on the inner end wall of the sealing ring 5, so that the sealing ring 5 can maintain a high-strength sealing effect with the outer wall of the valve plate 4.

[0049] The present solution configures the valve body 1 into a structure of a main valve body 101 and two detachable auxiliary valve bodies 102, and fixedly installs valve plates 4 corresponding to the positions of the two auxiliary valve bodies 102 on the left and right sides of the valve stem 3. The configuration of the two valve plates 4 not only improves the sealing effect of the valve plates 4 after opening and closing, but also cooperates with the two detachable auxiliary valve bodies 102 to facilitate online disassembly of the auxiliary valve bodies 102 to perform sequential maintenance on the two valve plates 4 in the valve body 1. During the maintenance process, there is no need to remove the butterfly valve from the pipeline, and the normal closing and use of the butterfly valve is not affected. In addition, a compensation cavity is provided inside the sealing cavity of the sealing ring 5 on the valve body 1, and a cold expansion compensation layer is provided inside the compensation cavity, which is tightly attached to the inner wall of the sealing ring 5. When working in a low temperature environment, the cold expansion compensation layer expands to a certain extent when it is cold, thereby pushing the sealing ring 5 to be squeezed outward, effectively improving the sealing degree between the sealing ring 5 and the valve plate 4, and the sealing effect between the valve body 1 and the valve plate 4 will not be affected by the contraction of the sealing ring 5.

[0050] The components used in the present invention are all universal standard parts or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0051] The above is only a preferred specific implementation manner of the present invention; but the protection scope of the present invention is not limited thereto; any technician familiar with the technical field within the technical scope disclosed by the present invention; any equivalent replacement or change based on the technical solution and improved concept of the present invention shall be covered by the protection scope of the present invention.

Claims

1. A top-mounted, online-maintainable, ultra-low-temperature butterfly valve, comprising a valve body (1) and a valve stem (3) rotatably mounted in the valve body (1), a valve cover (2) connected to the top end of the valve stem (3) being mounted on the valve body (1), a rotary disk being provided on one side of the valve cover (2), and characterized in that: The valve body (1) comprises a main valve body (101) and auxiliary valve bodies (102) embedded on both sides of the bottom end of the main valve body (101); both sides of the bottom end of the main valve body (101) are provided with arc-shaped embedding cavities for embedding the auxiliary valve bodies (102); valve plates (4) are fixedly installed on the left and right ends of the valve stem (3) located inside the valve body (1); sealing cavities corresponding to the position of the valve plates (4) are opened on both sides of the main valve body (101) and on the inner side walls of the two auxiliary valve bodies (102); sealing rings (5) located on the outer side of the valve plates (4) are embedded and installed in the mutually connected sealing cavities; compensation cavities are opened on the inner walls of the plurality of sealing cavities; the interiors of the compensation cavities are coated with a cold expansion compensation layer.

2. The top-mounted, online-maintainable, ultra-low-temperature butterfly valve according to claim 1 is characterized in that: The two auxiliary valve bodies (102) are both arc-shaped connecting bodies, and connecting blocks are fixedly connected to the relative positions of the two arc-shaped connecting bodies and the main valve body (101). The upper and lower corresponding connecting blocks are connected by mounting bolts, and a sealing gasket is attached to the connection between the auxiliary valve body (102) and the main valve body (101).

3. The top-mounted, online-maintainable ultra-low temperature butterfly valve according to claim 1 is characterized in that: The two valve plates (4) have opposing inner walls provided with arc-shaped embedding cavities (403) embedded and matched with the outer wall of the valve stem (3), and arc-shaped fastening sleeves (404) covering the outer wall of the valve stem (3) are provided on both sides of the arc-shaped embedding cavity (403), and magnetic attraction layers that attract each other are respectively attached to the opposing side walls of the arc-shaped fastening sleeves (404).

4. The top-mounted, online-maintainable ultra-low temperature butterfly valve according to claim 3 is characterized in that: A connecting plate (401) is fixedly connected to the side wall of the valve plate (4) at one end away from the valve stem (3), and a plurality of locking grooves are provided on the side wall of the connecting plate (401) opposite to the valve stem (3), and the corresponding locking grooves inside and outside are threadedly connected by locking screws (402).

5. The top-mounted, online-maintainable ultra-low temperature butterfly valve according to claim 4 is characterized in that: The outer end wall of the locking groove on the connecting plate (401) is filled with an anti-corrosion sealing plug, and the end surfaces of the valve plate (4) and the connecting plate (401) are coated with an anti-corrosion layer.

6. The top-mounted, online-maintainable ultra-low temperature butterfly valve according to claim 1 is characterized in that: The sealing ring (5) is coated on the side wall of the valve plate (4) close to the outer end, and the sealing ring (5) comprises a shrinkage-resistant filling layer (502) attached to the sealing cavity and a flexible sealing pad layer (501) arranged at the outer end of the shrinkage-resistant filling layer (502).

7. The top-mounted, online-maintainable ultra-low temperature butterfly valve according to claim 6 is characterized in that: The shrinkage-resistant filling layer (502) is made of glass fiber and insulating adhesive, and the mass ratio of the glass fiber to the insulating adhesive is 1:

2.

8. The top-mounted, online-maintainable, ultra-low-temperature butterfly valve according to claim 7 is characterized in that: The cold expansion compensation layer comprises an elastic extrusion layer (7) embedded in the compensation cavity, the cold expansion layer (6) is filled between the elastic extrusion layer (7) and the compensation cavity, and the outer end of the elastic extrusion layer (7) is in contact with the shrinkage-resistant filling layer (502).

9. The top-mounted, online-maintainable ultra-low temperature butterfly valve according to claim 8, characterized in that: The elastic extrusion layer (7) is made of a low-temperature resistant elastic sheet, and the outer end surface of the elastic extrusion layer (7) has a wavy structure.

10. The top-mounted, online-maintainable, ultra-low-temperature butterfly valve according to claim 8, characterized in that: The cold expansion layer (6) is made of a cold expansion material, and the cold expansion material is a 3D printed micro-lattice structure material.

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