Sealing type flange butterfly valve

Abstract

The invention discloses a sealing type flange butterfly valve, and relates to the technical field of butterfly valves, the sealing type flange butterfly valve comprises a tail cover, the tail cover is screwed to the bottom of a lower shaft sleeve, a lower valve rod is clamped to the inner wall of the lower shaft sleeve, the top end of the lower valve rod vertically penetrates through the middle of the bottom of a valve seat, and an upper valve rod vertically penetrates through the middle of the top of the valve seat; the top end of the upper valve rod is connected to the inner wall of the upper shaft sleeve in a clamped mode, the top of the upper shaft sleeve is connected to the bottom of the support in a screwed mode, a handle is arranged on the top of the support, a butterfly plate is arranged between the upper valve rod and the lower valve rod, and sealing sleeves are arranged on the inner wall of the lower shaft sleeve and the inner wall of the upper shaft sleeve. According to the sealing type flange butterfly valve, the sealing sleeve has excellent elastic recovery capacity and automatic compensation capacity, effective sealing can be formed between the valve rod and the shaft sleeve, the leakage problem caused by gap changes is reduced, the rubber sealing ring and the metal sealing ring are combined, double sealing is achieved, the sealing reliability of the butterfly plate is improved, and the sealing performance of the butterfly plate is improved. And the leakage risk is reduced, and the medium adaptability is enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of butterfly valves, in particular to a sealed flange butterfly valve. Background Art

[0002] D43H triple eccentric multi-layer sealing flange butterfly valve is a long-life, energy-saving butterfly valve. Its structure adopts the principle of three-dimensional braided core design, and the valve seat adopts a multi-layer structure compatible with hard and soft seals. It is exquisitely processed and advanced in technology. Therefore, it is widely used in pipelines of corrosive media such as metallurgy, electric power, petroleum, chemical industry, air, gas, combustible gas, water supply and drainage, etc.

[0003] D43H butterfly valve is usually composed of valve body, butterfly plate, valve stem, sealing assembly and other main components. The valve seat adopts a multi-level structure compatible with hard and soft seals. This design can adapt to different working conditions and improve the sealing performance and service life of the valve. The sealing surface of the butterfly valve adopts a hard seal design, which can better resist medium corrosion and wear. The main components are made of high-strength materials, such as stainless steel and alloy steel, with high tensile strength and compressive strength, ensuring the safety and reliability of the valve.

[0004] The current sealed flange butterfly valve still has the following shortcomings:

[0005] 1. The existing butterfly valve is easily subjected to vibration shock between the valve stem and the shaft sleeve during use, which gradually forms a gap and causes medium leakage;

[0006] 2. The existing butterfly valves often have only one hard sealing layer inside the butterfly plate, which is prone to leakage due to gap changes during long-term use. Summary of the invention

[0007] In view of the shortcomings of the prior art, the present invention provides a sealed flange butterfly valve, which solves the problem mentioned in the above background technology that the valve stem and the shaft sleeve of the existing butterfly valve are easily subjected to vibration impact during use, thereby gradually forming a gap, causing medium leakage, and the existing butterfly valve often has only one hard sealing layer inside the butterfly plate, which is prone to leakage due to changes in the gap during long-term use.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a sealed flange butterfly valve, comprising a tail cover, the tail cover is screwed to the bottom of the lower sleeve, the inner wall of the lower sleeve is clamped with a lower valve stem, the top end of the lower valve stem vertically penetrates the middle of the bottom of the valve seat, the middle of the top of the valve seat is vertically penetrated with an upper valve stem, the top end of the upper valve stem is clamped to the inner wall of the upper sleeve, the top of the upper sleeve is screwed to the bottom of the bracket, a handle is provided on the top of the bracket, a butterfly plate is provided between the upper valve stem and the lower valve stem, and a sealing sleeve is provided on the inner walls of the lower sleeve and the upper sleeve.

[0009] Optionally, a slot is provided in the middle of the top of the tail cover, and screw holes are provided on the left and right sides of the bottom wall of the slot.

[0010] Optionally, a lower screw plate is provided at the bottom end of the lower sleeve, and the lower screw plate and the slot are engaged with each other.

[0011] Optionally, an upper screw plate is provided at the top of the upper sleeve, through holes are provided on the inner walls of the upper sleeve and the upper screw plate, and the top of the upper valve stem vertically passes through the through hole.

[0012] Optionally, a first screw plate is provided at the bottom of the bracket.

[0013] Optionally, a second screw plate is provided on the outer wall of the top end of the upper valve stem.

[0014] Optionally, the sealing sleeve includes a silicone sleeve layer and a compression spring component, the silicone sleeve layer is arranged on the inner walls of the lower sleeve and the upper sleeve, and the compression spring component is arranged between the silicone sleeve layer layers.

[0015] Optionally, a rubber sealing ring is provided on the annular outer wall of the butterfly plate, and a metal sealing ring is sleeved on the outer wall of the rubber sealing ring.

[0016] Optionally, flanges are provided at both left and right ends of the valve seat.

[0017] The present invention provides a sealed flange butterfly valve, which has the following beneficial effects:

[0018] The sealed flange butterfly valve, the engagement of the lower screw plate with the slot, and the connection with the fastening bolts make the connection between the lower sleeve and the tail cover more secure and not easy to loosen, and by adjusting the position of the lower sleeve, the screw holes opened on the surface of the lower screw plate and the slot can be better matched and corresponded, ensuring the accuracy and reliability of the connection. At the same time, the combined connection method of threaded connection and engagement is relatively simple. The operator can complete the installation and disassembly by inserting the lower screw plate into the slot and then tightening the fastening bolts, thereby improving work efficiency.

[0019] The sealing flange butterfly valve, the provision of the upper screw plate increases the contact area between the upper sleeve and the bracket, making the connection between the two more firmly, and under the tightening action of the stud bolts, the upper screw plate can better withstand axial force and torque, thereby improving the stability and reliability of the entire butterfly valve, and at the same time, the provision of the upper screw plate can increase the supporting area of ​​the upper sleeve and improve its bearing capacity, thereby ensuring the normal operation of the butterfly valve, the presence of the first screw plate increases the contact area between the bracket and the upper sleeve, thereby improving the strength and stability of the connection between the two, and by using the stud bolts to connect the first screw plate and the upper screw plate together, they can be easily installed and disassembled, thereby improving the efficiency of maintenance and overhaul.

[0020] The sealed flange butterfly valve can be easily installed and disassembled by sleeve- ing the second screw plate on the top outer wall of the upper valve stem, thereby improving the efficiency of maintenance and inspection. The operator can adjust the position of the second screw plate so that the screw holes opened on its surface coincide with the screw holes opened on the bottom wall of the bracket, thereby achieving precise connection and positioning. At the same time, the presence of the second screw plate can further increase the stability of the upper valve stem, reduce the vibration and swing generated during use, and improve the working reliability of the butterfly valve.

[0021] The sealed flange butterfly valve has a silicone sleeve with excellent elastic recovery ability. Under the reverse push of the compression spring component, it can fit tightly against the surface of the upper valve stem and the lower valve stem to form an effective seal. This elastic seal can adapt to different working conditions and ensure the reliability of the seal, thereby reducing the risk of medium leakage. The compression spring component can automatically compensate for the change in the gap between the upper valve stem and the lower valve stem and the lower sleeve and the upper sleeve. At the same time, when encountering gap changes caused by factors such as temperature expansion and installation errors, the sealing sleeve can be adjusted in time to maintain a good sealing state, thereby reducing leakage problems caused by gap changes.

[0022] The sealing flange butterfly valve, the combination of rubber sealing ring and metal sealing ring provides the butterfly plate with more reliable sealing performance, so that it can effectively prevent medium leakage, wherein the rubber sealing ring has good elasticity and adaptability, can adapt to the pressure and temperature changes of the medium, and the metal sealing ring has high strength and wear resistance, can maintain good sealing performance under harsh working conditions, and the wear resistance of the metal sealing ring can extend the service life of the butterfly plate and reduce the frequency of replacing the sealing ring, and the double sealing structure also increases the reliability of the seal and reduces the risk of leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the invention;

[0024] Figure 2 It is a schematic diagram of the front cross-sectional structure of the invention;

[0025] Figure 3 It is a schematic diagram of the valve seat structure in the invention;

[0026] Figure 4 It is a schematic diagram of the upper sleeve structure in the invention;

[0027] Figure 5 It is a schematic diagram of the lower sleeve structure in the invention;

[0028] Figure 6 It is a schematic diagram of the sealing sleeve structure in the invention;

[0029] Figure 7 It is a schematic diagram of the butterfly plate structure in the invention.

[0030] In the figure: 1, tail cover; 101, slot; 2, lower sleeve; 201, lower screw plate; 3, lower valve stem; 4, valve seat; 401, flange; 5, upper valve stem; 501, second screw plate; 6, upper sleeve; 601, upper screw plate; 7, bracket; 701, first screw plate; 8, handle; 9, butterfly plate; 901, rubber sealing ring; 902, metal sealing ring; 10, sealing sleeve; 1001, silicone sleeve layer; 1002, compression spring member. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it 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 an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] See also Figures 1 to 7 The present invention provides a technical solution: a sealed flange butterfly valve, comprising a tail cover 1, the tail cover 1 is screwed to the bottom of a lower sleeve 2, a lower valve stem 3 is clamped on the inner wall of the lower sleeve 2, the top of the lower valve stem 3 vertically penetrates the middle of the bottom of a valve seat 4, an upper valve stem 5 vertically penetrates the middle of the top of the valve seat 4, the top of the upper valve stem 5 is clamped on the inner wall of an upper sleeve 6, the top of the upper sleeve 6 is screwed to the bottom of a bracket 7, a handle 8 is provided on the top of the bracket 7, a butterfly plate 9 is provided between the upper valve stem 5 and the lower valve stem 3, and a sealing sleeve 10 is provided on the inner walls of the lower sleeve 2 and the upper sleeve 6.

[0035] In this embodiment, Figure 1 and Figure 2 and Figure 5As shown, a slot 101 is provided in the middle of the top of the tail cover 1, and screw holes are provided on the left and right sides of the bottom wall of the slot 101; it should be noted that the operator can first vertically insert the bottom end of the lower sleeve 2 into the slot 101 provided on the top of the tail cover 1, so that the tail cover 1 and the lower sleeve 2 can be engaged with each other, and then use the fastening bolts to screw into the corresponding screw holes of the slot 101 and the bottom end of the lower sleeve 2, and tighten them to complete the assembly connection between the tail cover 1 and the lower sleeve 2. In actual use, the design of the slot 101 allows the lower sleeve 2 to be easily inserted therein to achieve the preliminary connection between the tail cover 1 and the lower sleeve 2. This mutually engaging design simplifies the assembly process and improves production efficiency. By providing screw holes on the left and right sides of the bottom wall of the slot 101, and using the fastening bolts to thread the tail cover 1 and the lower sleeve 2, the connection stability between the two can be further enhanced to ensure that the tail cover 1 will not loosen or fall off during use.

[0036] In this embodiment, Figure 2 and Figure 5 As shown, a lower screw plate 201 is provided at the bottom end of the lower sleeve 2, and the lower screw plate 201 and the slot 101 are engaged with each other; it should be noted that when the operator vertically inserts the lower screw plate 201 provided at the bottom end of the lower sleeve 2 into the slot 101 opened at the top of the tail cover 1, the outer diameter of the lower screw plate 201 coincides with the inner diameter of the slot 101, so that the two fit tightly together. At the same time, the position of the lower sleeve 2 is adjusted so that the screw holes opened on the surface of the lower screw plate 201 coincide with the screw holes opened on the bottom wall of the slot 101, and then the fastening bolts are screwed into the corresponding screw holes of the slot 101 and the bottom end of the lower sleeve 2, and tightened. , the threaded connection between the tail cover 1 and the lower sleeve 2 can be completed. In actual use, the engagement of the lower screw plate 201 with the slot 101 and the connection with the fastening bolts make the connection between the lower sleeve 2 and the tail cover 1 more secure and not easy to loosen. By adjusting the position of the lower sleeve 2, the screw holes opened on the surface of the lower screw plate 201 and the slot 101 can be better matched and corresponded to ensure the accuracy and reliability of the connection. At the same time, the combined connection method of the threaded connection and the engagement is relatively simple. The operator can complete the installation and disassembly by inserting the lower screw plate 201 into the slot 101 and then tightening the fastening bolts, thereby improving work efficiency.

[0037] In this embodiment, Figure 4As shown, an upper screw plate 601 is provided at the top of the upper sleeve 6, and through holes are opened on the inner walls of the upper sleeve 6 and the upper screw plate 601, and the top of the upper valve stem 5 vertically passes through the through hole; it should be noted that after completing the assembly connection between the tail cover 1 and the lower sleeve 2, the operator can vertically insert the top of the upper valve stem 5 that passes through the through hole of the upper sleeve 6 into the interior of the bracket 7, so that the upper screw plate 601 provided at the top of the upper sleeve 6 can fit the bottom of the bracket 7, and then use the stud bolts to screw the upper sleeve 6 and the bracket 7 together to complete the assembly of the two. In actual use, the setting of the upper screw plate 601 increases the contact area between the upper sleeve 6 and the bracket 7, making the connection between the two more firmly, and under the tightening action of the stud bolts, the upper screw plate 601 can better withstand axial force and torque, thereby improving the stability and reliability of the entire butterfly valve. At the same time, the setting of the upper screw plate 601 can increase the support area of ​​the upper sleeve 6 and improve its bearing capacity, thereby ensuring the normal operation of the butterfly valve.

[0038] In this embodiment, Figure 2 and Figure 4 As shown, a first screw plate 701 is provided at the bottom of the bracket 7; it should be noted that when the operator vertically inserts the top end of the upper valve stem 5 into the interior of the bracket 7, the upper screw plate 601 provided at the top end of the upper shaft sleeve 6 will be tightly fitted to the bottom of the first screw plate 701 provided at the bottom of the bracket 7. At the same time, the operator can manually adjust the relative position between the upper screw plate 601 and the first screw plate 701 so that the screw holes opened on the surfaces of the two can overlap with each other, and then use the stud bolts to screw into the overlapping screw holes and tighten them, thereby completing the bracket 7 and the upper The threaded connection of the sleeve 6, in actual use, the presence of the first screw plate 701 increases the contact area between the bracket 7 and the upper sleeve 6, thereby improving the strength and stability of the connection between the two, and by using stud bolts to connect the first screw plate 701 and the upper screw plate 601 together, they can be easily installed and disassembled, thereby improving the efficiency of maintenance and inspection. At the same time, the operator can manually adjust the relative position between the upper screw plate 601 and the first screw plate 701 to achieve adjustment and positioning of the bracket 7 and the upper sleeve 6 to ensure the accurate connection between the two.

[0039] In this embodiment, Figure 2 and Figure 7As shown, the top outer wall of the upper valve stem 5 is provided with a second screw plate 501; it should be noted that, after the operator vertically inserts the top of the upper valve stem 5 into the interior of the bracket 7, the operator can first open the top cover of the entire bracket 7, and sleeve the second screw plate 501 on the top outer wall of the upper valve stem 5 so that it fits with the bottom wall of the bracket 7. At the same time, the position of the second screw plate 501 is adjusted so that the screw hole opened on its surface can correspond to the position of the screw hole opened on the bottom wall of the bracket 7 directly below it, and then use a two-way bolt to screw it into the overlapping screw hole and tighten it, so that the upper valve stem 5 can be realized. The fastening connection between the valve stem 5 and the upper valve stem 5 can be conveniently installed and disassembled in actual use by sleeved the second screw plate 501 on the top outer wall of the upper valve stem 5, thereby improving the efficiency of maintenance and inspection. The operator can adjust the position of the second screw plate 501 so that the screw holes opened on its surface coincide with the screw holes opened on the bottom wall of the bracket 7, thereby achieving precise connection and positioning. At the same time, the presence of the second screw plate 501 can further increase the stability of the upper valve stem 5, reduce the vibration and swing generated during use, and improve the working reliability of the butterfly valve.

[0040] In this embodiment, Figure 6 As shown, the sealing sleeve 10 includes a silicone sleeve layer 1001 and a compression spring member 1002, wherein the silicone sleeve layer 1001 is arranged on the inner walls of the lower sleeve 2 and the upper sleeve 6, and the compression spring member 1002 is arranged between the interlayers of the silicone sleeve layer 1001; it should be noted that the operator can vertically insert the upper valve stem 5 and the lower valve stem 3 into the interior of the lower sleeve 2 and the upper sleeve 6 respectively, during which time the outer walls of the upper valve stem 5 and the lower valve stem 3 will respectively push the silicone sleeve layer 1001 at the corresponding position outward, so that the compression spring member 1002 arranged in the interlayer of the silicone sleeve layer 1001 is squeezed and deformed, thereby expanding the opening diameters of the lower sleeve 2 and the upper sleeve 6, so that the upper valve stem 5 and the lower valve stem 3 can be fully inserted into the corresponding sleeves, and at the same time, the compression spring member 1002 will release the compression energy, thereby pushing the silicone sleeve layer 1001 tightly. It fits the outer wall of the upper valve stem 5 and the lower valve stem 3 to make up the gap between them and the lower sleeve 2 and the upper sleeve 6, so as to realize the sealed connection between the upper valve stem 5 and the lower valve stem 3 and the lower sleeve 2 and the upper sleeve 6. In actual use, the silicone sleeve layer 1001 has excellent elastic recovery ability. Under the reverse push of the compression spring member 1002, it can tightly fit the surface of the upper valve stem 5 and the lower valve stem 3 to form an effective seal. This elastic seal can adapt to different working conditions and ensure the reliability of the seal, thereby reducing the risk of medium leakage. The compression spring member 1002 can automatically compensate for the gap changes between the upper valve stem 5 and the lower valve stem 3 and the lower sleeve 2 and the upper sleeve 6. At the same time, when encountering gap changes caused by factors such as temperature expansion and installation errors, the sealing sleeve 10 can be adjusted in time to maintain a good sealing state, thereby reducing leakage problems caused by gap changes.

[0041] In this embodiment, Figure 7 As shown, the annular outer wall of the butterfly plate 9 is provided with a rubber sealing ring 901, and the outer wall of the rubber sealing ring 901 is sleeved with a metal sealing ring 902; it should be noted that when the butterfly valve is in use, its operator can manually turn the handle 8 in time when the medium enters the valve seat 4, so that the butterfly plate 9 is driven to rotate through the upper valve stem 5 connected thereto through the handle 8 in turn. During this period, the outer wall of the butterfly plate 9 will rotate in contact with the inner wall of the valve seat 4 until the entire butterfly plate 9 rotates to close the opening of the valve seat 4. At the same time, its metal sealing ring 902 will fit closely with the inner wall of the valve seat 4 and produce extrusion deformation, while the rubber sealing ring 90 1 absorbs pressure transmission at the same time, so that in actual use, the combination of the rubber sealing ring 901 and the metal sealing ring 902 provides the butterfly plate 9 with a more reliable sealing performance, so that it can effectively prevent medium leakage, wherein the rubber sealing ring 901 has good elasticity and adaptability, and can adapt to the pressure and temperature changes of the medium, while the metal sealing ring 902 has high strength and wear resistance, and can maintain good sealing performance under harsh working conditions, and the wear resistance of the metal sealing ring 902 can extend the service life of the butterfly plate 9 and reduce the frequency of replacing the sealing ring, and the double sealing structure also increases the reliability of the seal and reduces the risk of leakage.

[0042] In this embodiment, Figure 3 As shown, flanges 401 are provided at both ends of the valve seat 4; it should be noted that before using the flange butterfly valve in the present invention, the operator needs to manually assemble its various components together, and then install the entire valve seat 4 between the pipes. Then, the operator can fit the flanges 401 provided at the inlet and outlet ends of the valve seat 4 to the mounting flanges at the pipe openings on both sides, and then use the fastening screws to screw them into the corresponding overlapping screw holes one by one, thereby completing the threaded installation between the valve seat 4 and the pipe. In actual use, the presence of the flange 401 makes the connection between the valve seat 4 and the pipe more convenient, and the installation and disassembly can be carried out by tightening or loosening the fastening screws, reducing the difficulty of installation and maintenance, and the fit between the flanges 401 can form a good seal to prevent medium leakage and ensure the sealing of the butterfly valve. At the same time, the fastening screws connect the flange 401 to the pipe, and also increase the connection strength between the valve seat 4 and the pipe, so that the valve seat 4 can withstand the pressure and various external forces in the pipe.

[0043] The use method of the present invention: When the sealed flange butterfly valve is used, the working process is as follows:

[0044] like Figures 1 to 7As shown, first, the operator vertically inserts the lower screw plate 201 provided at the bottom end of the lower sleeve 2 into the slot 101 opened at the top of the tail cover 1. Since the outer diameter of the lower screw plate 201 matches the inner diameter of the slot 101, the two fit tightly together. At the same time, the position of the lower sleeve 2 is adjusted so that the screw holes opened on the surface of the lower screw plate 201 coincide with the screw holes opened on the bottom wall of the slot 101. Then, the fastening bolts are screwed into the corresponding screw holes of the slot 101 and the bottom end of the lower sleeve 2, and tightened to complete the threaded connection between the tail cover 1 and the lower sleeve 2. Then, the upper valve stem 5 and the lower valve stem 3 are vertically inserted into the lower sleeve 2 and the upper sleeve 6 respectively. During this period, the outer walls of the upper valve stem 5 and the lower valve stem 3 will respectively push the silicone sleeve layer 1001 at the corresponding position outward, so that the compression spring member 1002 arranged in the interlayer of the silicone sleeve layer 1001 is squeezed and deformed, thereby expanding the opening diameter of the lower shaft sleeve 2 and the upper shaft sleeve 6, so that the upper valve stem 5 and the lower valve stem 3 can be fully inserted into the corresponding shaft sleeves. At the same time, the compression spring member 1002 will release the compression energy, thereby pushing the silicone sleeve layer 1001 back to fit tightly against the outer walls of the upper valve stem 5 and the lower valve stem 3, making up for the gap between them and the lower shaft sleeve 2 and the upper shaft sleeve 6, so as to achieve the sealed connection between the upper valve stem 5 and the lower valve stem 3 and the lower shaft sleeve 2 and the upper shaft sleeve 6. , and then the operator vertically inserts the top of the upper valve stem 5 into the interior of the bracket 7, and the upper screw plate 601 provided at the top of the upper sleeve 6 will fit tightly against the bottom of the first screw plate 701 provided at the bottom of the bracket 7. At the same time, the operator can manually adjust the relative position between the upper screw plate 601 and the first screw plate 701 so that the screw holes opened on the surfaces of the two can coincide with each other, and then use the stud bolts to screw into the overlapping screw holes and tighten them, thereby completing the threaded connection between the bracket 7 and the upper sleeve 6, and then install the entire valve seat 4 between the pipes. Again, the operator can fit the flange 401 provided at the inlet and outlet ends of the valve seat 4 to the pipes on both sides. The mounting flange at the mouth is then screwed into the corresponding overlapping screw holes with the fastening screws, thereby completing the threaded installation between the valve seat 4 and the pipeline. When the medium flows into the pipeline, the operator can manually turn the handle 8 in time, thereby driving the butterfly plate 9 to rotate through the upper valve stem 5 connected thereto through the handle 8 in turn. During this period, the outer wall of the butterfly plate 9 will rotate in contact with the inner wall of the valve seat 4 until the entire butterfly plate 9 rotates to close the opening of the valve seat 4. At the same time, its metal sealing ring 902 will fit closely with the inner wall of the valve seat 4 and produce extrusion deformation, while the rubber sealing ring 901 will absorb the pressure transmission at the same time, thereby achieving effective cutoff of the medium.

[0045] The above description 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 can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A sealed flange butterfly valve, comprising a tail cover (1), characterized in that: The tail cover (1) is screwed to the bottom of the lower sleeve (2), the inner wall of the lower sleeve (2) is clamped with a lower valve stem (3), the top end of the lower valve stem (3) vertically penetrates the middle of the bottom of the valve seat (4), the middle of the top of the valve seat (4) is vertically penetrated with an upper valve stem (5), the top end of the upper valve stem (5) is clamped to the inner wall of the upper sleeve (6), the top of the upper sleeve (6) is screwed to the bottom of the bracket (7), the top of the bracket (7) is provided with a handle (8), a butterfly plate (9) is provided between the upper valve stem (5) and the lower valve stem (3), and the inner walls of the lower sleeve (2) and the upper sleeve (6) are provided with sealing sleeves (10).

2. The sealed flange butterfly valve according to claim 1, characterized in that: A slot (101) is provided in the middle of the top of the tail cover (1), and screw holes are provided on the left and right sides of the bottom wall of the slot (101).

3. The sealed flange butterfly valve according to claim 2, characterized in that: A lower screw plate (201) is provided at the bottom end of the lower shaft sleeve (2), and the lower screw plate (201) and the clamping groove (101) are mutually engaged.

4. The sealed flange butterfly valve according to claim 1, characterized in that: An upper screw plate (601) is provided at the top of the upper sleeve (6), and through holes are provided on the inner walls of the upper sleeve (6) and the upper screw plate (601), and the top of the upper valve stem (5) vertically penetrates the interior of the through hole.

5. The sealed flange butterfly valve according to claim 1, characterized in that: A first screw plate (701) is provided at the bottom of the bracket (7).

6. The sealed flange butterfly valve according to claim 1, characterized in that: A second screw plate (501) is provided on the outer wall of the top end of the upper valve stem (5).

7. The sealed flange butterfly valve according to claim 1, characterized in that: The sealing sleeve (10) comprises a silicone sleeve layer (1001) and a compression spring component (1002), wherein the silicone sleeve layer (1001) is arranged on the inner walls of the lower shaft sleeve (2) and the upper shaft sleeve (6), and the compression spring component (1002) is arranged between the silicone sleeve layers (1001).

8. The sealed flange butterfly valve according to claim 1, characterized in that: The annular outer wall of the butterfly plate (9) is provided with a rubber sealing ring (901), and the outer wall of the rubber sealing ring (901) is sleeved with a metal sealing ring (902).

9. The sealed flange butterfly valve according to claim 1, characterized in that: Flange plates (401) are provided at both left and right ends of the valve seat (4).

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