A high performance sealing butterfly valve

Abstract

The present invention relates to a high-performance sealing butterfly valve, comprising a valve body, a valve stem, a butterfly plate, and a valve seat. A flow channel is arranged in the valve body, the valve stem is rotatably mounted on the valve body, the butterfly plate is fixedly connected to the valve stem, the valve seat is arranged in the flow channel, the butterfly plate is provided with a sealing pair, a first sealing surface is arranged on the outer periphery of the sealing pair, a first sealing ring is arranged between the sealing pair and the butterfly plate, the valve seat is slidably mounted on the valve body, a second sealing surface is arranged on the inner periphery of the valve seat, a positioning assembly is arranged on the right side of the valve seat, the positioning assembly comprises an annular adjustment seat and a first locking bolt, the adjustment seat is slidably mounted on the valve body, an adjustment perforation is arranged through the adjustment seat, the adjustment perforation is in the shape of a long strip, the valve body is provided with a locking screw hole, the first locking bolt passes through the adjustment perforation and is threadedly matched with the locking screw hole. By adopting the above scheme, a high-performance sealing butterfly valve is provided, which can replace the sealing pair and slide the valve seat to realize the replacement of the butterfly plate and the valve seat as a whole without the need to replace the first sealing surface and the second sealing surface.

Description

Technical Field

[0001] The invention relates to a high-performance sealing butterfly valve. Background Art

[0002] A butterfly valve, also known as a flap valve, is a simple regulating valve used to control the flow of various fluids, including air, water, steam, various corrosive media, slurries, oils, liquid metals, and radioactive media. It primarily serves to shut off and throttle flow in pipelines. Existing butterfly valves typically consist of a valve body, a valve stem, a butterfly disc, and a valve seat. The valve body is provided with a flow channel extending from side to side. The valve stem is rotatably mounted to the valve body, with its axial direction aligned vertically. The butterfly disc is positioned within the flow channel and fixedly connected to the valve stem. The valve seat is fixedly mounted within the flow channel. Rotation of the valve stem drives the butterfly disc and valve seat to close the flow channel, while rotation of the butterfly disc and valve seat disengages the disc to open the flow channel.

[0003] Among them, sealing performance is one of the most important parameters of butterfly valves. The valve seats on existing butterfly valves are fixed to the valve body in a high-strength fixing manner. Therefore, after long-term use, the sealing surfaces on the valve seat and the butterfly plate are worn, and the valve seat and butterfly plate need to be replaced as a whole, which results in excessively high maintenance costs. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a high-performance sealing butterfly valve that can replace the sealing pair and adjust the sliding of the valve seat to achieve the goal of not having to replace the butterfly plate and the valve seat as a whole when the first sealing surface and the second sealing surface are damaged.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: it includes a valve body, a valve stem, a butterfly plate, and a valve seat, wherein a flow channel is provided in the valve body and runs through the valve body to the left and right, the valve stem is rotatably installed in the valve body, and the axial direction is vertical, the butterfly plate is placed in the flow channel and is fixedly connected to the valve stem, the valve seat is arranged in the flow channel and is located on the right side of the butterfly plate, characterized in that: an annular sealing pair is detachably connected to the right side of the butterfly plate, a first sealing surface is provided on the outer periphery of the sealing pair, a first sealing ring is provided between the sealing pair and the butterfly plate, the valve seat is slidably installed on the valve body along the left and right directions, a second sealing surface for abutting against the first sealing surface is provided on the inner periphery of the valve seat, and a positioning assembly is provided on the right side of the valve seat, the positioning assembly includes an annular adjustment seat and a first locking bolt, the adjustment seat is slidably installed on the valve body along the left and right directions, the adjustment seat is radially penetrated with an adjustment through-hole, the adjustment through-hole is a long strip extending left and right, a locking screw hole is provided on the valve body corresponding to the adjustment through-hole, the first locking bolt passes through the adjustment through-hole and is threadedly matched with the locking screw hole.

[0006] By adopting the above technical solution, 1. the valve stem realizes the abutment between the first sealing surface and the second sealing surface by rotating, thereby closing the flow channel, and the first sealing surface and the second sealing surface can be separated by rotating the valve stem, thereby opening the flow channel; 2. when the first sealing surface and the second sealing surface are worn after long-term use, a gap is generated between the first sealing surface and the second sealing surface, which can be adjusted by driving the adjustment seat to the left, so that the valve seat will be adjusted to the left under the push of the adjustment seat, thereby eliminating the gap between the first sealing surface and the second sealing surface, and the sealing can continue to be used without the need to replace the butterfly plate and the valve seat due to wear, so that the maintenance cost is lower; 3. After the above adjustment many times, the first sealing surface and the second sealing surface are completely damaged or unevenly damaged and the seal cannot be adjusted, the valve seat is replaced, and the butterfly plate only needs to be replaced with the sealing pair, and there is no need to replace the butterfly plate as a whole, so that the maintenance cost is lower.

[0007] The present invention is further configured as follows: a first alloy part is welded on the outer periphery of the sealing pair, a first sealing surface is arranged on the first alloy part, the cross section of the first sealing surface is arranged in an arc shape, a second alloy part is welded on the inner periphery of the valve seat, and the second sealing surface is arranged on the second alloy part.

[0008] By adopting the above technical solution, the first alloy part and the second alloy part are formed locally by welding with an alloy material having better wear resistance, so that the butterfly valve is more wear-resistant and has a longer service life while having a lower production cost.

[0009] The present invention is further configured as follows: the number of adjustment perforations is several, and each of the adjustment perforations is arranged along the circumferential spacing of the adjustment seat, the number of first locking bolts and the number of locking screw holes are arranged corresponding to the number of adjustment perforations, and each first locking bolt in the adjustment seat is respectively provided with a first built-in groove for the head of the corresponding first locking bolt to be inserted, and an annular sealing groove is provided on the inner periphery of the adjustment seat, and a sealing ring for sealing each first built-in groove is provided in the sealing groove.

[0010] By adopting the above technical solution, 1. the coordinated use of several adjustment through-holes, locking screw holes and the first locking bolt improves the fixed installation strength between the adjustment seat and the valve body after adjustment, thereby ensuring stability in use; 2. The setting of the first built-in groove allows the head of the first locking bolt to be built-in, which reduces the impact on flow channel transmission; 3. The setting of the sealing ring in the sealing groove closes the first built-in groove, preventing the first locking bolt from loosening and falling into the flow channel and being lost with the flow of the flow channel.

[0011] The present invention is further configured as follows: the positioning assembly also includes a ring-shaped fixing seat, a fixing bolt and an anti-retraction bolt. The fixing seat is arranged on the right side of the adjustment seat. The fixing bolt is used to fix the fixing seat to the valve body. The fixing seat is provided with an anti-retraction screw hole along the left and right directions. The anti-retraction bolt is threadedly matched with the anti-retraction screw hole, and the anti-retraction bolt is against the adjustment seat.

[0012] By adopting the above technical solution, after the adjustment seat is adjusted and the first locking bolt is fixed to the valve body, the anti-retraction bolt is rotated to make the anti-retraction bolt press against the adjustment seat. Therefore, even if the first locking bolt is loose, the anti-retraction bolt can prevent the adjustment seat from shifting to the right and causing a gap between the first sealing surface and the second sealing surface, thereby ensuring the effectiveness of the seal.

[0013] The present invention is further configured as follows: the number of anti-retraction screw holes is several, each of the anti-retraction screw holes is arranged along the circumferential spacing of the fixing seat, and the number of anti-retraction bolts is arranged corresponding to the number of anti-retraction screw holes.

[0014] By adopting the above technical solution, a plurality of anti-retraction bolts cooperate to achieve the stability of the circumferential force of the adjustment seat.

[0015] The present invention is further configured as follows: a positioning insertion hole for inserting an anti-retraction bolt is provided on the right side of the adjustment seat.

[0016] By adopting the above technical solution, the anti-retraction bolt is partially inserted into the alignment socket to achieve circumferential positioning of the adjustment seat and the fixing seat.

[0017] The present invention is further configured as follows: the positioning assembly also includes an annular anti-rotation seat, an anti-rotation cap and a second locking bolt. The anti-rotation seat is arranged on the right side of the fixed seat. The anti-rotation seat is penetrated by an anti-rotation through-hole in the left and right directions. The fixed seat is provided with an anti-rotation screw hole corresponding to the anti-rotation through-hole. The second locking bolt passes through the anti-rotation through-hole and is threadedly connected with the anti-rotation screw hole. The head of the anti-retreat bolt is an external hexagon. The anti-rotation cap is provided with a first matching groove that is adapted to the shape and size of the head of the anti-retreat bolt. A number of clamping teeth are arranged circumferentially on the outer periphery of the anti-rotation cap. The anti-rotation seat is provided with a second matching groove that is adapted to the shape and size of the outer periphery of the anti-rotation cap.

[0018] By adopting the above technical solution, when the anti-backoff bolt is adjusted into place, the anti-rotation cap is put on the head of the anti-backoff bolt, and then the anti-rotation seat is matched with the anti-backoff bolt. Among them, since the engaging teeth themselves are small in size and the spacing between adjacent engaging teeth is small, even if the current position of the anti-rotation cap does not match the second matching groove, only fine-tuning within a spacing is required to achieve matching, which basically does not affect the position of the anti-backoff bolt. After the anti-rotation cap and the anti-rotation seat are matched, the anti-rotation seat is fixed to the fixing seat with high strength by the second locking bolt to complete the installation, realizing the rotation limit of the anti-backoff bolt and ensuring the stable anti-backoff function of the anti-backoff bolt.

[0019] The present invention is further configured as follows: the fixing seat is provided with a fixing portion located on the outer periphery of the anti-rotation seat, the fixing portion is provided with a fixing through-hole extending radially through the anti-rotation seat, the valve stem is provided with a fixing screw hole corresponding to the fixing through-hole, the fixing bolt passes through the fixing through-hole and is threadedly connected to the fixing screw hole, the fixing portion is provided with a second built-in groove for the head of the corresponding fixing bolt to be inserted into the fixing through-hole facing the anti-rotation seat, and the second built-in groove faces the outer peripheral wall of the anti-rotation seat.

[0020] By adopting the above technical solution, the setting of the fixing part can realize that the fixing bolt is located at the outer periphery of the anti-rotation seat, thereby effectively preventing the fixing bolt from loosening and falling into the flow channel and being lost along with the flow of the flow channel.

[0021] The present invention is further configured as follows: the valve seat is located on the inner circumference of the adjustment seat and is provided with a first covering ring extending axially, the adjustment seat is located on the inner circumference of the fixed seat and is provided with a second covering ring extending axially, and the anti-rotation seat is located on the inner circumference of the fixed seat and is provided with a third covering ring extending axially.

[0022] By adopting the above technical solution, the first cover ring is used to prevent the left and right spacing between the valve seat and the adjustment seat from being exposed to the flow channel, the second cover ring is used to prevent the left and right spacing between the adjustment seat and the fixed seat from being exposed to the flow channel, and the third cover ring is used to prevent the left and right spacing between the fixed seat and the anti-rotation seat from being exposed to the flow channel, making the flow smoother. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 A cross-sectional view of a specific embodiment of the present invention;

[0025] Figure 2 It is a parts diagram of the anti-rotation cap in a specific embodiment of the present invention;

[0026] Figure 3 for Figure 1 A magnified view of middle A;

[0027] Figure 4 for Figure 3 Enlarged view of middle B;

[0028] Figure 5 for Figure 3 Enlarged view of C in the middle. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] like Figure 1-Figure 5 As shown, the present invention discloses a high-performance sealing butterfly valve, including a valve body 1, a valve stem 2, a butterfly plate 3, and a valve seat 4. A flow channel 11 running through the valve body 1 is provided, and the valve stem 2 is rotatably mounted on the valve body 1, and the axial direction is vertical. The butterfly plate 3 is placed in the flow channel 11 and is fixedly connected to the valve stem 2 by a card connection. The valve seat 4 is arranged in the flow channel 11 and is located on the right side of the butterfly plate 3. The right side of the butterfly plate 3 is detachably connected by bolts and is provided with an annular sealing pair 31. The outer periphery of the sealing pair 31 is provided with a first sealing surface 311, and a first sealing ring 32 is provided between the sealing pair 31 and the butterfly plate 3. The valve seat 4 is slidably mounted on the valve body 1 in the left and right directions by cooperating with the inner peripheral wall of the flow channel 11, and the inner periphery of the valve seat 4 is provided with a sealing ring 31. There is a second sealing surface 41 for abutting against the first sealing surface 311. In addition, a positioning assembly is provided on the right side of the valve seat 4, wherein the positioning assembly includes an annular adjustment seat 5 and a first locking bolt 51, and the adjustment seat 5 is cooperated with the inner circumferential wall of the flow channel 11 to achieve sliding installation on the valve body 1 along the left and right directions, wherein a ceramic sealing ring 81 is provided between the adjustment seat 5 and the valve seat 4, and a second sealing ring 82 is provided between the outer periphery of the adjustment seat 5 and the valve body 1. In addition, an adjustment through-hole 52 is provided radially through the adjustment seat 5, and the adjustment through-hole 52 is in the shape of a long strip extending left and right. Correspondingly, a locking screw hole 12 is provided on the valve body 1 corresponding to the adjustment through-hole 52, and the first locking bolt 51 passes through the adjustment through-hole 52 and is threadedly engaged with the locking screw hole 12.

[0031] Therefore, 1. the valve stem 2 rotates to achieve the abutment between the first sealing surface 311 and the second sealing surface 41, thereby sealing the flow channel 11, and the first sealing surface 311 and the second sealing surface 41 can be separated by the rotation of the valve stem 2, thereby opening the flow channel 11; 2. when the first sealing surface 311 and the second sealing surface 41 are worn after long-term use, a gap is generated between the first sealing surface 311 and the second sealing surface 41, which can be adjusted by driving the adjustment seat 5 to the left, so that the valve seat 4 is adjusted to the left under the push of the adjustment seat 5, thereby eliminating the gap between the first sealing surface 311 and the second sealing surface 41, and the sealing can continue to be used without the need to replace the butterfly plate 3 and the valve seat 4 due to wear, so that the maintenance cost is lower; 3. after the above-mentioned adjustments are repeated many times, resulting in the first sealing surface 311 and the second sealing surface 41 being completely damaged or unevenly damaged and unable to adjust the seal, the valve seat 4 is replaced, and the butterfly plate 3 only needs to replace the sealing pair 31, without replacing the butterfly plate 3 as a whole, so that the maintenance cost is lower.

[0032] Among them, the outer periphery of the sealing pair 31 in this embodiment is welded with a first alloy part 312, the first sealing surface 311 is set on the first alloy part 312, the cross-section of the first sealing surface 311 is set in an arc shape, and the inner periphery of the valve seat 4 is welded with a second alloy part 42, and the second sealing surface 41 is set on the second alloy part 42, so that the local first alloy part 312 and the second alloy part 42 are welded by an alloy material with better wear resistance, so that the butterfly valve is more wear-resistant and the service life is increased under low production costs.

[0033] Preferably, the number of the adjustment through-holes 52 in this embodiment is several, and each of the adjustment through-holes 52 is arranged along the circumferential spacing of the adjustment seat 5. The number of the first locking bolts 51 and the number of the locking screw holes 12 are arranged corresponding to the number of the adjustment through-holes 52. The adjustment seat 5 is provided with a first built-in groove 53 for the head of the corresponding first locking bolt 51 to be built in, and an annular blocking groove is provided on the inner circumference of the adjustment seat 5. A blocking ring 54 (rubber ring) is provided in the blocking groove for blocking each first built-in groove 53. Made of rubber material), therefore, 1. the coordinated use of the plurality of adjustment through-holes 52, the locking screw holes 12 and the first locking bolt 51 improves the fixed installation strength of the adjustment seat 5 and the valve body 1 after the adjustment is completed, thereby ensuring the stability of use; 2. The setting of the first built-in groove 53 allows the head of the first locking bolt 51 to be built-in, thereby reducing the impact on the transmission of the flow channel 11; 3. The setting of the sealing ring 54 in the sealing groove closes the first built-in groove 53 to prevent the first locking bolt 51 from loosening and falling into the flow channel 11 and being lost along with the flow of the flow channel 11.

[0034] In addition, the positioning assembly in this embodiment also includes an annular fixing seat 6, a fixing bolt 61 and an anti-backlash bolt 62. The fixing seat 6 is arranged on the right side of the adjusting seat 5. The fixing bolt 61 is used to fix the fixing seat 6 to the valve body 1. In addition, the fixing seat 6 is provided with an anti-backlash screw hole 63 along the left and right directions, wherein the anti-backlash bolt 62 is threadedly engaged with the anti-backlash screw hole 63, and the left end of the anti-backlash bolt 62 is against the adjusting seat 5. Therefore, when the adjusting seat 5 is adjusted and the first locking bolt 51 is fixed to the valve body 1, the anti-backlash bolt 62 is rotated to make the anti-backlash bolt 62 against the adjusting seat 5. Therefore, even if the first locking bolt 51 is loosened, the anti-backlash bolt 62 can prevent the adjusting seat 5 from shifting to the right, resulting in a gap between the first sealing surface 311 and the second sealing surface 41, thereby ensuring the effectiveness of the seal.

[0035] Preferably, the number of anti-retraction screw holes 63 in this embodiment is several, and each of the anti-retraction screw holes 63 is arranged along the circumferential spacing of the fixing seat 6, and the number of anti-retraction bolts 62 is arranged corresponding to the number of anti-retraction screw holes 63. Therefore, several anti-retraction bolts 62 cooperate to achieve the stability of the circumferential force of the adjustment seat 5.

[0036] Preferably, the right side of the adjustment seat 5 in this embodiment is provided with an alignment hole 55 for inserting the anti-retreat bolt 62, so that the anti-retreat bolt 62 is partially inserted into the alignment hole 55 to achieve circumferential positioning of the adjustment seat 5 and the fixed seat 6.

[0037] Among them, the positioning assembly in this embodiment also includes an annular anti-rotation seat 7, an anti-rotation cap 71 and a second locking bolt 72, wherein the anti-rotation seat 7 is arranged on the right side of the fixing seat 6, and the anti-rotation seat 7 is penetrated by an anti-rotation through hole 73 in the left and right directions, and correspondingly, the fixing seat 6 is provided with an anti-rotation screw hole 64 corresponding to the anti-rotation through hole 73, so that the second locking bolt 72 passes through the anti-rotation through hole 73 and is threadedly connected with the anti-rotation screw hole 64, wherein the head of the anti-retreat bolt 62 is an outer hexagon, and the anti-rotation cap 71 is provided with a first matching groove 711 that is adapted to the shape and size of the head of the anti-retreat bolt 62, in addition, the outer periphery of the anti-rotation cap 71 is provided with a plurality of engaging teeth 712 arranged circumferentially, and correspondingly, the anti-rotation seat 7 is provided with an anti-rotation screw hole 64 that is connected to the outer periphery of the anti-rotation cap 71 The second matching groove is adapted in shape and size. Therefore, when the anti-retreat bolt 62 is adjusted into place, the anti-rotation cap 71 is put on the head of the anti-retreat bolt 62, and then the anti-rotation seat 7 is matched with the anti-retreat bolt 62. Among them, since the engaging teeth 712 themselves are small in size and the spacing between adjacent engaging teeth 712 is small, even if the current position of the anti-rotation cap 71 does not match the second matching groove, only fine-tuning within a spacing is required to achieve matching, which basically does not affect the position of the anti-retreat bolt 62. After the anti-rotation cap 71 is matched with the anti-rotation seat 7, the anti-rotation seat 7 is fixed to the fixing seat 6 with high strength by the second locking bolt 72 to complete the installation, thereby realizing the rotation limit of the anti-retreat bolt 62 and ensuring the stable anti-retreat function of the anti-retreat bolt 62.

[0038] Preferably, the fixing seat 6 in this embodiment is provided with a fixing portion 65 located on the outer periphery of the anti-rotation seat 7, wherein the fixing portion 65 is provided with a fixing through-hole 651 radially extending through the anti-rotation seat 7, and the corresponding valve body 1 is provided with a fixing screw hole 13 corresponding to the fixing through-hole 651, so that the fixing bolt 61 passes through the fixing through-hole 651 and is threadedly connected with the fixing screw hole 13. In addition, the fixing portion 65 is provided with a second built-in groove 652 on the side of the fixing through-hole 651 facing the anti-rotation seat 7 for the head of the corresponding fixing bolt 61 to be built in. Preferably, the second built-in groove 652 faces the outer peripheral wall of the anti-rotation seat 7, so that the setting of the fixing portion 65 realizes that the fixing bolt 61 is located on the outer periphery of the anti-rotation seat 7, thereby effectively preventing the fixing bolt 61 from loosening and falling into the flow channel 11 and being lost with the flow of the flow channel 11.

[0039] In addition, the valve seat 4 in this embodiment is located on the inner circumference of the adjusting seat 5 and is provided with a first cover ring 43 extending axially, the adjusting seat 5 is located on the inner circumference of the fixed seat 6 and is provided with a second cover ring 56 extending axially, and the anti-rotation seat 7 is located on the inner circumference of the fixed seat 6 and is provided with a third cover ring 74 extending axially, so that the first cover ring 43 prevents the left and right spacing between the valve seat 4 and the adjusting seat 5 from being exposed to the flow channel 11, the second cover ring 56 prevents the left and right spacing between the adjusting seat 5 and the fixed seat 6 from being exposed to the flow channel 11, and the third cover ring 74 prevents the left and right spacing between the fixed seat 6 and the anti-rotation seat 7 from being exposed to the flow channel 11, so that the flow is smoother.

[0040] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-performance sealed butterfly valve, comprising a valve body, a valve stem, a butterfly plate, and a valve seat. The valve body is provided with a flow channel running through left and right. The valve stem is rotatably mounted on the valve body, and the axial direction is vertical. The butterfly plate is placed in the flow channel and is fixedly connected to the valve stem. The valve seat is arranged in the flow channel and is located on the right side of the butterfly plate. The characteristics are: A ring-shaped sealing pair is detachably connected to the right side of the butterfly plate, a first sealing surface is provided on the outer periphery of the sealing pair, a first sealing ring is provided between the sealing pair and the butterfly plate, the valve seat is slidably installed on the valve body along the left and right directions, a second sealing surface for abutting against the first sealing surface is provided on the inner periphery of the valve seat, a positioning assembly is provided on the right side of the valve seat, the positioning assembly includes a ring-shaped adjustment seat and a first locking bolt, the adjustment seat is slidably installed on the valve body along the left and right directions, the adjustment seat is radially penetrated with adjustment through holes, the adjustment through holes are in the shape of long strips extending left and right, locking screw holes are provided on the valve body corresponding to the adjustment through holes, the first locking bolt passes through the adjustment through holes and cooperates with the thread of the locking screw holes.

2. A high performance sealing butterfly valve according to claim 1, characterized in that: A first alloy part is welded on the outer periphery of the sealing pair, a first sealing surface is arranged on the first alloy part, a cross section of the first sealing surface is arranged in an arc shape, a second alloy part is welded on the inner periphery of the valve seat, and a second sealing surface is arranged on the second alloy part.

3. A high performance sealing butterfly valve according to claim 1, characterized in that: There are several adjustment through-holes, and each of the adjustment through-holes is arranged at a circumferential spacing along the adjustment seat. The number of first locking bolts and the number of locking screw holes are arranged corresponding to the number of adjustment through-holes. Each first locking bolt in the adjustment seat is respectively provided with a first built-in groove for the head of the corresponding first locking bolt to be inserted therein, and an annular sealing groove is provided on the inner periphery of the adjustment seat, and a sealing ring for sealing each first built-in groove is provided in the sealing groove.

4. A high performance sealing butterfly valve according to any one of claims 1 to 3, characterized in that: The positioning assembly also includes a ring-shaped fixing seat, a fixing bolt and an anti-retraction bolt. The fixing seat is arranged on the right side of the adjusting seat. The fixing bolt is used to fix the fixing seat to the valve body. The fixing seat is penetrated by an anti-retraction screw hole in the left and right directions. The anti-retraction bolt is threadedly matched with the anti-retraction screw hole, and the anti-retraction bolt is against the adjusting seat.

5. A high performance sealing butterfly valve according to claim 4, characterized in that: There are a plurality of anti-retraction screw holes, each of which is arranged along the circumferential spacing of the fixing seat, and the number of anti-retraction bolts is arranged correspondingly to the number of anti-retraction screw holes.

6. A high performance sealing butterfly valve according to claim 4, characterized in that: A positioning socket for inserting an anti-retraction bolt is arranged on the right side of the adjustment seat.

7. A high performance sealing butterfly valve according to claim 4, characterized in that: The positioning assembly also includes an annular anti-rotation seat, an anti-rotation cap and a second locking bolt. The anti-rotation seat is arranged on the right side of the fixed seat. The anti-rotation seat is penetrated with anti-rotation through holes in the left and right directions. The fixed seat is provided with anti-rotation screw holes corresponding to the anti-rotation through holes. The second locking bolt passes through the anti-rotation through holes and is threadedly connected with the anti-rotation screw holes. The head of the anti-retreat bolt is an external hexagon. The anti-rotation cap is provided with a first matching groove that is compatible with the shape and size of the head of the anti-retreat bolt. A number of clamping teeth are arranged circumferentially along the outer periphery of the anti-rotation cap, and the anti-rotation seat is provided with a second matching groove that is compatible with the shape and size of the outer periphery of the anti-rotation cap.

8. A high performance sealing butterfly valve according to claim 7, characterized in that: The fixing seat is located on the outer periphery of the anti-rotation seat and is provided with a fixing portion, the fixing portion is provided with a fixing through hole radially extending through the anti-rotation seat, the valve stem is provided with a fixing screw hole corresponding to the fixing through hole, the fixing bolt passes through the fixing through hole and is threadedly connected with the fixing screw hole, the fixing portion is located on the side of the fixing through hole facing the anti-rotation seat and is provided with a second built-in groove for the head of the corresponding fixing bolt to be inserted, and the second built-in groove faces the outer peripheral wall of the anti-rotation seat.

9. A high performance sealing butterfly valve according to claim 7, characterized in that: The valve seat is located at the inner circumference of the adjustment seat and is provided with a first covering ring along the axial extension, the adjustment seat is located at the inner circumference of the fixed seat and is provided with a second covering ring along the axial extension, and the anti-rotation seat is located at the inner circumference of the fixed seat and is provided with a third covering ring along the axial extension.

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