Butterfly valve bonnet and positioning method

Abstract

The present invention discloses a butterfly valve bonnet and a positioning method, comprising a butterfly valve body, a valve stem, a sealing gasket and a pressure cover, wherein a gate plate is arranged inside the butterfly valve body, a valve stem is inserted outside the gate plate, holes and grooves are opened on both sides of the bottom of the valve stem, and the holes and grooves are used to insert and fix the gate plate, one end of the top of the valve stem is inserted into the butterfly valve body, a sealing ring is sleeved on the outside of the top end of the valve plate, a sealing gasket is arranged on the top of the sealing ring, and the sealing gasket is sleeved on the outside of the valve stem, the present invention enhances the sealing performance by optimizing the structural design of the butterfly valve bonnet, especially by improving the matching mode of the valve stem, the sealing gasket and the pressure cover; the groove of the sealing gasket is engaged with the convex structure of the inner wall of the groove at the top of the butterfly valve body, which effectively prevents the sealing gasket from rotating with the rotation of the valve stem, reduces the wear of the sealing ring, thereby extending the service life of the seal and improving the reliability of the entire butterfly valve system.

Description

Technical Field

[0001] The invention relates to the technical field of a butterfly valve bonnet and a positioning method, and in particular to a butterfly valve bonnet and a positioning method. Background Art

[0002] In the field of industrial fluid control, butterfly valves are a commonly used type of valves, which are widely used in various pipeline systems due to their compact structure, easy operation and good sealing performance. The main components of butterfly valves include butterfly valve body, gate, valve stem, sealing gasket and gland, etc. The traditional butterfly valve design has some limitations in actual operation, especially in terms of sealing performance and positioning accuracy;

[0003] In the traditional butterfly valve design, the gasket and the sealing ring are easily worn in long-term operation, resulting in a decrease in sealing performance. This wear not only increases maintenance costs, but may also cause leakage, affecting the safety and stability of the pipeline system. Therefore, how to improve the sealing performance of the butterfly valve and reduce the wear of the seal is a major problem that needs to be solved in the prior art;

[0004] In addition, the existing butterfly valves lack an effective positioning mechanism during operation, so the position control of the gate is not precise enough, which may cause position deviation during the opening and closing process of the valve, affecting the accuracy of fluid control. This problem of inaccurate positioning is particularly prominent in situations where fine control of fluid flow is required.

[0005] To this end, the present invention proposes a butterfly valve bonnet and a positioning method, which aim to improve the sealing performance of the butterfly valve, reduce the wear of the sealing component, and improve the positioning accuracy of the butterfly valve to ensure that the gate can be accurately controlled. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a butterfly valve bonnet and a positioning method, which solve the problems of insufficient sealing performance and insufficient positioning accuracy of the prior butterfly valve mentioned in the background technology.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a butterfly valve bonnet and positioning method, comprising a butterfly valve body, a valve stem, a sealing gasket and a pressure cover, a gate plate is arranged inside the butterfly valve body, a valve stem is inserted outside the gate plate, holes are provided on both sides of the bottom of the valve stem, and the holes are used to insert and fix the gate plate, one end of the top of the valve stem is inserted into the interior of the butterfly valve body, a sealing ring is sleeved on the outside of the top end of the valve plate, a sealing gasket is arranged on the top of the sealing ring, the sealing gasket is sleeved on the outside of the valve stem, a pressure cover is sleeved on the outside of the top end, a hole groove is provided inside the pressure cover, and a fixing bolt is inserted inside the hole groove, one end of the bottom of the fixing bolt is threadedly connected to one end of the top of the valve stem, a positioning screw is provided on one side of the pressure cover, and one end of the bottom of the positioning screw is threadedly connected to one end of the top of the butterfly valve body.

[0008] Preferably, two sealing grooves are provided on the outer wall at the top end of the valve stem, and the sealing grooves are in a ring-shaped structure, and the inside of the sealing grooves is used to embed the sealing ring. By designing a ring-shaped sealing groove on the outer wall at the top end of the valve stem, the sealing ring can be more effectively embedded, thereby enhancing the sealing performance of the butterfly valve. This structure can ensure that the position of the sealing ring on the valve stem is more stable, reducing the risk of leakage.

[0009] Preferably, a hole groove is provided at one end of the top of the valve stem, and the inner wall of the hole groove is a threaded structure, the outer part of the top end of the valve stem is a square structure, and the top end of the valve stem is embedded with the bottom of the pressure cover, and the bottom of the pressure cover is provided with a groove, and the shape of the groove is consistent with the shape of the top of the valve stem. The inner wall of the hole groove at the top end of the valve stem is designed to be a threaded structure, which allows the valve stem to be connected to the pressure cover or other components through threads, enhances the stability and reliability of the connection, and reduces the loose connection caused by vibration or pressure changes. The square structure at one end of the top of the valve stem is consistent with the shape of the groove at the bottom of the pressure cover. This design provides a precise positioning and fixing mechanism to ensure the correct alignment between the valve stem and the pressure cover, thereby improving the stability of the overall structure and the accuracy of operation.

[0010] Preferably, a groove is provided on the top of the butterfly valve body, and the sealing ring and the sealing gasket are embedded in the groove; the inner wall of the groove on the top of the butterfly valve body is provided with a convex structure, and a groove is provided on the outer side of the sealing gasket; the groove on the outer side of the sealing gasket is engaged with the convex structure on the inner wall of the groove on the top of the butterfly valve body; the sealing gasket is made of stainless steel, and the convex structure on the inner wall of the groove on the top of the butterfly valve body is engaged with the groove on the outer side of the sealing gasket; this engaging mechanism enhances the positioning stability of the sealing gasket and prevents displacement during valve operation, thereby ensuring long-term sealing performance; the sealing gasket is made of stainless steel, which has excellent corrosion resistance and wear resistance, can maintain performance in various working environments, and extend the service life of the sealing component.

[0011] Preferably, the outer wall of one end of the top of the gland is in a square structure, and the outer side of one end of the bottom of the gland is in a circular structure. Two grooves are provided on the outer wall of one end of the bottom of the gland, and the surface of the groove on the outer side of the gland is in an arc-shaped structure. The outside of the gland is engaged with the outer wall of the top end of the positioning screw through the groove. The bottom end of the positioning screw is threadedly connected to the butterfly valve body. A hexagonal groove is provided at the top end of the positioning screw. The hexagonal groove design at the top end of the positioning screw facilitates tightening or loosening with tools, which simplifies the maintenance and operation process. This design makes the fixing and adjustment of the gland more convenient and quick.

[0012] Preferably, a convex structure is provided at the bottom of the gland, and the convex structure at the bottom of the gland is arranged in an arc shape, and the convex structure at the bottom of the gland is in sliding contact with the top of the sealing gasket.

[0013] Preferably, the steps are as follows:

[0014] S01: Assembly of valve stem and butterfly valve body: insert the valve stem into the hole groove at the top of the butterfly valve body so that the bottom end of the valve stem can be fitted on the outside of the gate and fixed through the hole groove; then, fit the sealing gasket on the outside of the valve stem, ensuring that the sealing gasket and the sealing ring are both embedded in the groove at the top of the butterfly valve body to achieve a sealing effect;

[0015] S02: Fixed sealing of gland and valve stem: Align the groove at the bottom of gland with the top end of valve stem to ensure that the bottom of gland can further seal the hole groove at the top of butterfly valve body; then, insert the fixing bolt into the hole groove at the top of gland, and make the bottom end of fixing bolt be threadedly connected with the top end of valve stem; by tightening the fixing bolt, the gland is firmly fixed on the top of valve stem;

[0016] S03: Butterfly valve switch operation: By rotating the gland, the valve stem is driven to rotate, and then the valve stem can drive the gate to rotate, so as to achieve the switch effect of the butterfly valve body; during the rotation of the valve stem, the outer wall groove of the sealing gasket is engaged with the convex block on the inner wall of the groove at the top of the butterfly valve body, so the sealing gasket can play a better positioning effect, avoiding the sealing gasket from rotating with the valve stem, thereby avoiding driving the sealing ring to rotate and reducing the wear of the sealing ring;

[0017] S04: Secondary sealing operation: When the sealing ring and the butterfly valve body are loose, the fixing bolts are rotated so that the fixing bolts can press the gland downward, and then the gland moves downward to press the sealing gasket and the sealing ring for the second time to achieve the secondary sealing effect;

[0018] S05: Fixing and adjusting the rotation angle of the gland: When the rotation angle of the gland needs to be fixed, tighten the positioning screw so that the positioning screw can move downward, and the top end of the positioning screw engages with the groove on the outer wall of the gland to fix the angle of the gland, thereby keeping the gate angle inside the butterfly valve body fixed; loosen the positioning screw so that the positioning screw can move upward and disengage from the gland, allowing the gland to rotate; after the gland rotates ninety degrees, the positioning screw moves downward to engage with another groove on the outside of the gland to achieve the positioning effect.

[0019] The present invention provides a butterfly valve bonnet and a positioning method, which have the following beneficial effects:

[0020] (1) Improving sealing performance and reliability: The present invention enhances the sealing performance by optimizing the structural design of the butterfly valve bonnet, especially by improving the matching mode of the valve stem, the sealing gasket and the pressure cover; the groove of the sealing gasket engages with the convex structure of the inner wall of the groove at the top of the butterfly valve body, effectively preventing the sealing gasket from rotating with the valve stem, reducing the wear of the sealing ring, thereby extending the service life of the seal and improving the reliability of the entire butterfly valve system.

[0021] (2) Enhance the accuracy and stability of valve positioning: By introducing the design of positioning screws and glands, the present invention provides an effective valve positioning mechanism; the positioning screws can engage with the grooves on the outer wall of the gland to fix the angle of the gland, thereby keeping the angle of the gate inside the butterfly valve body fixed, thereby improving the accuracy and stability of valve operation and ensuring the accuracy of fluid control.

[0022] (3) Simplified maintenance and operation procedures: The design of the present invention simplifies the maintenance and operation procedures of the butterfly valve. Through the design of the tightening bolts and positioning screws, the butterfly valve can be quickly adjusted and maintained without the need for complicated tools or steps. When looseness occurs between the sealing ring and the butterfly valve body, secondary sealing can be achieved by simply turning the tightening bolts, greatly reducing maintenance time and costs. At the same time, the design of the positioning screws makes the positioning and angle adjustment of the valve more convenient and quick, thereby improving operating efficiency.

[0023] Thereby, the problems of insufficient sealing performance and insufficient positioning accuracy of the existing butterfly valve are solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is the explosion schematic diagram of the present invention;

[0026] Figure 3 This is a schematic diagram of the valve stem structure of the present invention;

[0027] Figure 4 This is a schematic diagram of the sealing groove structure of the present invention;

[0028] Figure 5 This is a schematic diagram of the valve cover structure of the present invention;

[0029] Figure 6 This is a schematic diagram of the sealing ring structure of the present invention;

[0030] Figure 7 It is a schematic diagram of the structure of the butterfly valve body of the present invention.

[0031] In the figure, 1, butterfly valve body; 2, gate; 3, valve stem; 4, sealing gasket; 5, gland; 6, positioning screw; 7, tightening bolt; 8, sealing groove; 9, sealing ring. DETAILED DESCRIPTION

[0032] The following will be combined with 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 of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Embodiment 1:

[0034] See also Figure 1-7The embodiment of the present invention provides a technical solution: a butterfly valve bonnet and positioning method, including a butterfly valve body 1, a valve stem 3, a sealing gasket 4 and a gland 5, a gate plate 2 is arranged inside the butterfly valve body 1, a valve stem 3 is inserted outside the gate plate 2, holes are provided on both sides of the bottom of the valve stem 3, and the holes are used to insert and fix the gate plate 2, one end of the top of the valve stem 3 is inserted inside the butterfly valve body 1, a sealing ring 9 is sleeved on the outside of the top end of the valve plate, a sealing gasket 4 is provided on the top of the sealing ring 9, the sealing gasket 4 is sleeved on the outside of the valve stem 3, a gland 5 is sleeved on the outside of the top end, a hole is provided inside the gland 5, and a fixing bolt 7 is inserted inside the hole, one end of the fixing bolt 7 is threadedly connected to the top end of the valve stem 3, and a positioning screw 6 is provided on one side of the gland 5. One end of the bottom of the screw 6 is threadedly connected to one end of the top of the butterfly valve body 1. A groove is provided on the top of the butterfly valve body 1. The sealing ring 9 and the sealing gasket 4 are embedded in the groove. The inner wall of the groove at the top of the butterfly valve body 1 is provided with a convex structure, and a groove is provided on the outside of the sealing gasket 4. The groove on the outside of the sealing gasket 4 is engaged with the convex structure on the inner wall of the groove on the top of the butterfly valve body 1. The sealing gasket 4 is made of stainless steel. The valve stem 3 is inserted into the hole groove on the top of the butterfly valve body 1, and then the bottom end of the valve stem 3 is sleeved on the outside of the gate plate 2 for fixing; then the sealing gasket 4 is sleeved on the outside of the valve stem 3, so that the sealing gasket 4 and the sealing ring 9 are both embedded in the groove on the top of the butterfly valve body 1, thereby achieving a sealing effect; two sealing grooves 8 are provided on the outer wall of the top end of the valve stem 3, and the sealing groove 8 It has a ring-shaped structure, and the sealing groove 8 is used to embed the sealing ring 9; a hole groove is provided at one end of the top of the valve stem 3, and the inner wall of the hole groove is a threaded structure, the outside of the top end of the valve stem 3 is a square-shaped structure, and the top end of the valve stem 3 is embedded with the bottom of the gland 5, and the bottom of the gland 5 is provided with a groove, and the shape of the groove is consistent with the shape of the top of the valve stem 3; then the groove at the bottom of the gland 5 is aligned with the top end of the valve stem 3, so that the bottom of the gland 5 can further seal the hole groove at the top of the butterfly valve body 1, and then the fixing bolt 7 is inserted into the hole groove at the top of the gland 5, so that the bottom end of the fixing bolt 7 can be threadedly connected with the top end of the valve stem 3, and the fixing bolt 7 is tightened, so that the gland 5 can be firmly fixed to the top of the valve stem 3, and the gland 5 can be firmly fixed to the top of the valve stem 3 by rotating. The dynamic pressure cover 5 can drive the valve stem 3 to rotate, and then the valve stem 3 can drive the gate plate 2 to rotate, so as to achieve the effect of opening and closing the butterfly valve body 1. During the rotation of the valve stem 3, the outer wall groove of the sealing gasket 4 is engaged with the convex block on the inner wall of the top groove of the butterfly valve body 1, so that the sealing gasket 4 can achieve a better positioning effect, avoiding the sealing gasket 4 to rotate with the rotation of the valve stem 3, thereby driving the sealing ring 9 to rotate and causing the sealing ring 9 to wear. When there is looseness between the sealing ring 9 and the butterfly valve body 1, the fixing bolts 7 are rotated to tighten the pressure cover 5 downward, and then the pressure cover 5 can move downward to perform secondary compression on the sealing gasket 4 and the sealing ring 9, thereby achieving the effect of secondary sealing.

[0035] Embodiment 2:

[0036] The embodiment of the present invention provides a technical solution: a butterfly valve bonnet and positioning method, wherein the outer wall of one end of the top of the gland 5 is in a square structure, and the outer side of one end of the bottom of the gland 5 is in a circular structure, two grooves are provided on the outer wall of one end of the bottom of the gland 5, and the surface of the groove on the outer side of the gland 5 is in an arc-shaped structure, the outside of the gland 5 is engaged with the outer wall of one end of the top of the positioning screw 6 through the groove, the bottom end of the positioning screw 6 is threadedly connected to the butterfly valve body 1, and the top end of the positioning screw 6 is provided with a hexagonal groove; a convex structure is provided at the bottom of the gland 5, and the convex structure at the bottom of the gland 5 is arranged in an arc shape, and the convex structure at the bottom of the gland 5 is in sliding contact with the top of the sealing gasket 4, and when the rotation angle of the gland 5 needs to be fixed, by tightening The positioning screw 6 is positioned so that the positioning screw 6 can move downward, and the top end of the positioning screw 6 can move downward so that the top end of the positioning screw 6 can be engaged with the groove on the outer wall of the gland 5, so that the angle of the gland 5 can be fixed, and the angle of the gate 2 inside the butterfly valve body 1 can be kept fixed. The gland 5 is positioned by the positioning screw 6, which is beneficial to fix the gate 2 switch. By loosening the positioning screw 6, the positioning screw 6 can be moved upward, so that the positioning screw 6 can be disengaged from the engagement with the gland 5, and the gland 5 can be rotated. After the gland 5 is rotated ninety degrees, the positioning screw 6 moves downward to engage with another groove on the outside of the gland 5, thereby achieving a positioning effect.

[0037] Embodiment 3:

[0038] The embodiment of the present invention provides a technical solution: a butterfly valve bonnet and a positioning method, the steps of which are as follows:

[0039] S01: Assembly of valve stem and butterfly valve body: insert valve stem 3 into the hole groove at the top of butterfly valve body 1, so that the bottom end of valve stem 3 can be fitted on the outside of gate plate 2 and fixed through the hole groove; then, fit sealing gasket 4 on the outside of valve stem 3, and ensure that sealing gasket 4 and sealing ring 9 are both embedded in the groove at the top of butterfly valve body 1 to achieve sealing effect;

[0040] S02: Fixed sealing of gland and valve stem: Align the groove at the bottom of gland 5 with the top end of valve stem 3 to ensure that the bottom of gland 5 can further seal the hole groove at the top of butterfly valve body 1; then, insert the fixing bolt 7 into the hole groove at the top of gland 5, and make the bottom end of fixing bolt 7 threadedly connected with the top end of valve stem 3; by tightening the fixing bolt 7, gland 5 is firmly fixed to the top of valve stem 3;

[0041] S03: Butterfly valve switch operation: By rotating the gland 5, the valve stem 3 is driven to rotate, and then the valve stem 3 can drive the gate plate 2 to rotate, so as to achieve the switch effect of the butterfly valve body 1; during the rotation of the valve stem 3, since the groove on the outer wall of the sealing gasket 4 is engaged with the convex block on the inner wall of the groove on the top of the butterfly valve body 1, the sealing gasket 4 can play a good positioning effect, so as to prevent the sealing gasket 4 from rotating with the valve stem 3, and then avoid driving the sealing ring 9 to rotate, thereby reducing the wear of the sealing ring 9;

[0042] S04: Secondary sealing operation: When the sealing ring 9 and the butterfly valve body 1 are loose, the fixing bolts 7 are rotated so that the fixing bolts 7 can press the gland 5 downward, thereby moving the gland 5 downward to perform secondary compression on the sealing gasket 4 and the sealing ring 9 to achieve a secondary sealing effect;

[0043] S05: Fixing and adjusting the rotation angle of the gland: When the rotation angle of the gland 5 needs to be fixed, the positioning screw 6 is tightened so that the positioning screw 6 can move downward, and one end of the top of the positioning screw 6 engages with the groove on the outer wall of the gland 5 to fix the angle of the gland 5, thereby keeping the angle of the gate 2 inside the butterfly valve body 1 fixed; the positioning screw 6 is loosened so that the positioning screw 6 can move upward to disengage from the engagement with the gland 5, allowing the gland 5 to rotate; after the gland 5 rotates ninety degrees, the positioning screw 6 moves downward to engage with another groove on the outside of the gland 5, thereby achieving a positioning effect.

[0044] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0045] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A butterfly valve bonnet, characterized in that: The butterfly valve comprises a butterfly valve body (1), a valve stem (3), a sealing gasket (4) and a gland (5), wherein a gate plate (2) is arranged inside the butterfly valve body (1), a valve stem (3) is inserted outside the gate plate (2), holes are provided on both sides of the bottom of the valve stem (3), and the holes are used to insert and fix the gate plate (2), one end of the top of the valve stem (3) is inserted into the butterfly valve body (1), a sealing ring (9) is sleeved on the outside of the top end of the valve plate, a sealing gasket (4) is arranged on the top of the sealing ring (9), the sealing gasket (4) is sleeved on the outside of the valve stem (3), a gland (5) is sleeved on the outside of the top end, a hole is provided inside the gland (5), and a fixing bolt (7) is inserted inside the hole, and one end of the fixing bolt (7) is threadedly connected to one end of the top of the valve stem (3), and one side of the gland (5) is provided with a positioning screw (6), and one end of the bottom of the positioning screw (6) is threadedly connected to one end of the top of the butterfly valve body (1).

2. A butterfly valve bonnet according to claim 1, characterized in that: Two sealing grooves (8) are provided on the outer wall of one end of the top of the valve stem (3). The sealing grooves (8) are ring-shaped structures, and the inside of the sealing grooves (8) is used for embedding sealing rings (9).

3. The butterfly valve bonnet according to claim 1, characterized in that: A hole groove is provided at one end of the top of the valve stem (3), and the inner wall of the hole groove is a threaded structure. The outside of the top end of the valve stem (3) is a square structure, and the top end of the valve stem (3) is embedded in the bottom of the pressure cover (5). The bottom of the pressure cover (5) is provided with a groove, and the shape of the groove matches the shape of the top of the valve stem (3).

4. The butterfly valve bonnet according to claim 1, characterized in that: The butterfly valve body (1) is provided with a groove at the top, and the sealing ring (9) and the sealing gasket (4) are embedded in the groove. The inner wall of the groove at the top of the butterfly valve body (1) is provided with a convex structure, and the outer side of the sealing gasket (4) is provided with a groove. The outer groove of the sealing gasket (4) is engaged with the convex structure on the inner wall of the groove at the top of the butterfly valve body (1), and the sealing gasket (4) is made of stainless steel.

5. The butterfly valve bonnet according to claim 1, characterized in that: The outer wall of the top end of the pressure cover (5) is in a square shape, and the outer side of the bottom end of the pressure cover (5) is in a circular shape. The outer wall of the bottom end of the pressure cover (5) is provided with two grooves, and the surface of the grooves on the outer side of the pressure cover (5) is in an arc-shaped structure. The outside of the pressure cover (5) is engaged with the outer wall of the top end of the positioning screw (6) through the grooves. The bottom end of the positioning screw (6) is threadedly connected to the butterfly valve body (1), and the top end of the positioning screw (6) is provided with a hexagonal groove.

6. The butterfly valve bonnet according to claim 1, characterized in that: The bottom of the gland (5) is provided with a convex structure, and the convex structure at the bottom of the gland (5) is arranged in an arc shape. The convex structure at the bottom of the gland (5) is in sliding contact with the top of the sealing gasket (4).

7. A butterfly valve bonnet positioning method according to any one of claims 1 to 6, characterized in that: The steps are as follows: S01: Assembly of the valve stem and the butterfly valve body: insert the valve stem (3) into the hole groove at the top of the butterfly valve body (1) so that the bottom end of the valve stem (3) can be fitted onto the outside of the gate plate (2) and fixed via the hole groove; then, fit the sealing gasket (4) onto the outside of the valve stem (3) to ensure that the sealing gasket (4) and the sealing ring (9) are both embedded in the groove at the top of the butterfly valve body (1) to achieve a sealing effect; S02: Fixed sealing of the gland and the valve stem: Align the groove at the bottom of the gland (5) with the top end of the valve stem (3) to ensure that the bottom of the gland (5) can further seal the hole groove at the top of the butterfly valve body (1); then, insert the fixing bolt (7) into the hole groove at the top of the gland (5), and thread the bottom end of the fixing bolt (7) with the top end of the valve stem (3); by tightening the fixing bolt (7), the gland (5) is firmly fixed to the top of the valve stem (3); S03: Butterfly valve switch operation: By rotating the gland (5), the valve stem (3) is driven to rotate, and the valve stem (3) can then drive the gate plate (2) to rotate, thereby achieving the switch effect of the butterfly valve body (1); during the rotation of the valve stem (3), the sealing gasket (4) can play a good positioning effect because the groove on the outer wall of the sealing gasket (4) is engaged with the convex block on the inner wall of the groove on the top of the butterfly valve body (1), thereby preventing the sealing gasket (4) from rotating with the valve stem (3), thereby preventing the sealing ring (9) from rotating, and reducing the wear of the sealing ring (9); S04: Secondary sealing operation: When there is looseness between the sealing ring (9) and the butterfly valve body (1), the fixing bolt (7) is rotated so that the fixing bolt (7) can press the gland (5) downward, thereby moving the gland (5) downward, and performing secondary compression on the sealing gasket (4) and the sealing ring (9), thereby achieving a secondary sealing effect; S05: Fixing and adjusting the rotation angle of the gland: When the rotation angle of the gland (5) needs to be fixed, the positioning screw (6) is tightened so that the positioning screw (6) can move downward, and one end of the top of the positioning screw (6) is engaged with the groove on the outer wall of the gland (5) to fix the angle of the gland (5), thereby keeping the angle of the gate (2) inside the butterfly valve body (1) fixed; By loosening the positioning screw (6), the positioning screw (6) can move upwards and disengage from the engagement with the pressure cover (5), allowing the pressure cover (5) to rotate; after the pressure cover (5) rotates ninety degrees, the positioning screw (6) moves downwards and can engage with another groove outside the pressure cover (5), thereby achieving a positioning effect.

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