stopcock valve

Abstract

This invention relates to the field of valve technology and discloses a plug valve, comprising: a valve body with an internal fluid channel, an opening communicating with the fluid channel on its side wall, and an annular groove surrounding the opening; a valve core assembled within the valve body; a valve cover, a sealing cover disposed at the opening, and having a first protrusion and a second protrusion, the first protrusion abutting against the valve core; the second protrusion engaging with the annular groove; a valve stem, one end connected to the valve core, the other end extending through the valve cover; the valve stem is used to drive the valve core to rotate, thereby controlling the opening and closing of the fluid channel; a dynamic seal disposed between the valve stem and the valve cover; and a static seal comprising a first seal sandwiched between the first protrusion and the valve body, and a second seal sandwiched between the second protrusion and the annular groove. This invention can effectively reduce the possibility of leakage of the medium from the joint between the valve body and the valve core, and between the valve body and the valve cover, thereby improving the overall sealing performance of the valve.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and more specifically to a plug valve. Background Technology

[0002] A plug valve is a type of valve that opens and closes a fluid passage by rotating a valve core. The valve core is typically a truncated cone, which mates with a conical sealing surface within the valve body to form a seal. Plug valves offer advantages such as simple structure, rapid opening and closing, and low fluid resistance, and are widely used in pipeline systems in petroleum, chemical, metallurgical, and water treatment industries.

[0003] However, because the sealing structure between the valve cover and the valve body is relatively simple, when the valve is in operation for a long time or in an environment with fluctuating operating conditions (such as temperature changes and pressure shocks), the seals are prone to aging or loosening, resulting in a decrease in sealing performance, which in turn causes the medium to leak from the joint surface between the valve cover and the valve body or from the joint surface between the valve core and the valve body. Summary of the Invention

[0004] This invention provides a plug valve to solve the problem of relatively poor sealing reliability of existing plug valves.

[0005] This invention provides a plug valve, comprising: The valve body has an internal fluid channel, and the side wall of the valve body has an opening that communicates with the fluid channel; the side wall of the valve body also has an annular groove surrounding the opening; The valve core is assembled into the valve body through the opening; A valve cover and a sealing cover are provided at the opening. The valve cover has a first protrusion and a second protrusion on the side facing the valve body. The first protrusion extends into the valve body through the opening and abuts against the valve core. The second protrusion surrounds the periphery of the first protrusion and is spaced apart from the first protrusion. The second protrusion is inserted into the annular groove. The valve stem has one end connected to the valve core and the other end extending out of the valve cover; the valve stem is used to drive the valve core to rotate relative to the valve body in order to control the opening and closing of the fluid passage; A dynamic seal is disposed between the valve stem and the valve cover; The static sealing element includes a first sealing element and a second sealing element, wherein the first sealing element is sandwiched between the first protrusion and the valve body, and the second sealing element is sandwiched between the second protrusion and the annular groove.

[0006] Beneficial Effects: This invention, by setting an annular groove on the valve body and arranging mutually spaced first and second protrusions on the valve cover, can both rely on the first protrusion to press against the valve core, stabilizing the valve core assembly position and ensuring a tight fit between the valve core and the valve body sealing surface, and utilize the second protrusion to insert into the annular groove to achieve precise alignment and installation of the valve cover and valve body. Simultaneously, the placement of first and second sealing elements at two mating positions forms a double static sealing structure, which, combined with the dynamic sealing element arranged between the valve stem and valve cover, constructs a multi-layered, all-round sealing protection system. This effectively resists the effects of complex working conditions such as temperature changes and pressure shocks, slows down the aging and loosening of sealing elements, significantly improves the overall sealing performance of the valve, and effectively reduces the possibility of media leakage from the joints between the valve body and valve core, and between the valve body and valve cover. Furthermore, this plug-in assembly structure offers precise positioning and convenient disassembly and assembly. While ensuring sealing stability and reliability, it also simplifies the assembly process, improves assembly efficiency, and further extends the overall service life of the plug valve under various industrial pipeline conditions.

[0007] In one optional embodiment, the plug valve further includes a first pressure plate located on the side of the valve cover away from the valve body, the first pressure plate being movably sleeved on the valve stem; the valve cover has a through hole for the valve stem to pass through, and the end of the valve cover away from the valve body has a receiving groove communicating with the through hole, the connection between the receiving groove and the through hole forming a stepped surface, and the dynamic sealing element is sandwiched between the first pressure plate and the stepped surface and fills the receiving groove.

[0008] Beneficial effects: This invention provides a receiving groove with a through hole at the end of the valve cover, forming a stepped surface. The dynamic seal is placed in the receiving groove, and then a first pressure plate movably sleeved on the valve stem is used to press and limit the dynamic seal. This not only achieves precise positioning and stable storage of the dynamic seal, preventing it from shifting or coming off during valve stem rotation, but also, with the pressing action of the first pressure plate, ensures that the dynamic seal fits tightly against the outer wall of the valve stem and the inner wall of the receiving groove, further enhancing the dynamic sealing effect at the valve stem. This effectively compensates for the wear gap of the dynamic seal, adapts to the valve stem rotation operation, and, by using the first pressure plate to press and limit the dynamic seal, the pressing force on the dynamic seal can be flexibly adjusted, maintaining the sealing stability of the valve stem area for a long time and further reducing the risk of media leakage along the valve stem gap.

[0009] In one optional embodiment, the first pressure plate is mounted on the valve cover by fasteners, and a pressure sleeve is provided between the first pressure plate and the dynamic seal. The pressure sleeve is slidably mounted on the valve stem, with one end of the pressure sleeve abutting against the first pressure plate and the other end abutting against the dynamic seal. The first pressure plate has a first limiting groove on the side facing the pressure sleeve, and a portion of the pressure sleeve is inserted into the first limiting groove and abuts against the bottom and wall of the first limiting groove.

[0010] Beneficial effects: This invention securely mounts the first pressure plate onto the valve cover using fasteners, and adds a sliding sleeve fitted onto the valve stem between the first pressure plate and the dynamic seal for force transmission and tightening. This ensures that the tightening force is evenly applied to the entire dynamic seal, avoiding uneven stress and localized deformation failure caused by single-point pressure. Simultaneously, the first limiting groove on the first pressure plate limits the insertion and positioning of the sleeve, effectively restricting radial and circumferential displacement, ensuring the sleeve remains coaxial with the valve stem, and thus ensuring a tight fit and balanced force distribution throughout the dynamic seal. This not only improves the stability and uniformity of the dynamic seal during valve stem rotation but also reduces abnormal wear on the dynamic seal, extending its service life and further optimizing the sealing and protection effect at the valve stem position.

[0011] In one optional embodiment, the dynamic seal is a packing seal and a packing gasket. The packing gasket is sleeved on the valve stem and includes an abutment portion and a sealing portion. The abutment portion fits against the stepped surface, and the packing seal is sandwiched between the abutment portion and the pressure sleeve. The sealing portion is located on the side of the abutment portion facing the valve core and is sandwiched between the valve stem and the wall of the through hole.

[0012] Beneficial effects: This invention sets the dynamic sealing element as a combination structure of a packing seal and a packing gasket. The packing gasket's abutting part conforms to the stepped surface to achieve positioning and support, while the sealing part conforms to the valve stem and the through hole wall to complete the internal basic seal. The packing seal is then sandwiched between the packing gasket and the pressure sleeve to bear the compression force, which allows the sealing force to be transmitted evenly in sequence. This ensures the sealing effect of the packing gasket on the radial clearance of the valve stem and allows the packing seal to fully fill the sealing gap, adapting to the valve stem rotation. This effectively improves the dynamic sealing tightness at the valve stem, while also dispersing the operating pressure and friction loss, slowing down the wear rate of the sealing components, and avoiding the problems of poor sealing and stress concentration damage that are common with single sealing structures. This further improves the sealing stability and service life of the valve stem.

[0013] In an alternative embodiment, the plug valve further includes a third seal, which is clamped between the valve stem and / or the through-hole wall via a mounting groove formed thereon, the third seal being located on the side of the sealing portion closer to the valve core.

[0014] Beneficial effects: This invention adds a third sealing element located on the side of the sealing part closer to the valve core between the valve stem and the wall of the through hole, and uses an assembly groove formed in the valve stem and / or the wall of the through hole to achieve positioning and installation. This forms an additional sealing barrier on the basis of the original dynamic seal, effectively preventing the medium from leaking outward along the valve stem, improving the sealing level and sealing reliability at the valve stem. At the same time, the assembly groove can stabilize and limit the third sealing element, preventing it from shifting or falling off during valve opening and closing, and ensuring the sealing effect under long-term operation.

[0015] In one optional embodiment, the plug valve further includes a second pressure plate located on the side of the valve cover away from the valve body, and the valve stem has a first valve section and a second valve section coaxially arranged at the end away from the valve core. The first valve section is located at the end of the valve stem, and the diameter of the first valve section is smaller than the diameter of the second valve section. A bearing seat is provided at the connection between the first valve section and the second valve section, and the second pressure plate is sleeved on the first valve section. A first bearing sleeved on the first valve section is sandwiched between the second pressure plate and the bearing seat.

[0016] Beneficial effects: This invention, by setting the valve stem end into a first valve section and a second valve section with different diameters and setting a bearing seat at the connection of the two valve sections, enables rapid installation and positioning of the bearing seat. Furthermore, in conjunction with the second pressure plate and the first bearing sleeved on the first valve section, on the one hand, the second pressure plate can apply a stable axial clamping force to the valve stem, causing the valve core to fit tightly against the valve body sealing surface, effectively improving the sealing performance of the valve core and reducing the risk of media leakage; on the other hand, the first bearing can reduce the frictional resistance during valve stem rotation, reduce the operating torque required for valve opening and closing, solve the problem of large opening and closing torque and laborious operation of traditional plug valves, making valve opening and closing actions more convenient and smooth. At the same time, the first bearing can play a coaxial limiting role for the valve stem, suppressing wobbling and shaking during valve stem rotation, improving the stability of valve stem operation, and extending the overall service life of the valve.

[0017] In one optional embodiment, the second pressure plate is mounted on the valve cover by fasteners, and the second pressure plate is also provided with a second bearing sleeved on the first valve section; And / or, the bearing housing is further provided with a sealing ring, which is located on the side of the first bearing near the valve cover.

[0018] Beneficial Effects: This invention uses fasteners to mount the second pressure plate on the valve cover, allowing operators to easily adjust the clamping force of the second pressure plate. This enables online control of the tightness of the seal between the valve core and the valve body, maintaining a good sealing effect. Simultaneously, a second bearing is installed inside the second pressure plate, forming a double-bearing support structure with the original first bearing. This effectively reduces frictional resistance during valve stem rotation, decreases the operating force required to open and close the valve, making valve operation easier and smoother. It also precisely corrects the coaxiality of the valve stem rotation, suppressing deviation and shaking during operation. Furthermore, the sealing rings installed inside the bearing housing prevent the working medium, dust, and moisture from entering the bearing installation area, preventing rust and jamming. They also retain internal lubricating grease, ensuring long-term stable operation of the bearing and effectively extending the service life of various bearings.

[0019] In one optional embodiment, the valve stem has a plug-in portion at one end near the valve core, and the valve core has a plug-in groove, into which the plug-in portion is inserted; the valve cover has a through hole for the valve stem to pass through, and the first protrusion has a second limiting groove communicating with the through hole, the connection between the second limiting groove and the through hole forming a limiting step, and the valve stem has an annular flange on its peripheral sidewall near the plug-in portion, the annular flange abutting against the limiting step, the groove wall of the second limiting groove, and the valve core.

[0020] Beneficial effects: This invention enables rapid and precise alignment and assembly of the valve stem and valve core through the insertion and engagement of the valve stem end plug-in part with the valve core plug-in groove, stably transmitting rotational torque and ensuring synchronous rotation of the two. Simultaneously, the annular flange on the valve stem abuts against and limits the valve core against the limiting step at the valve cover, the wall of the second limiting groove, and the valve core, respectively. This provides both axial and radial bidirectional positioning constraints on the valve stem, effectively limiting axial movement and radial offset during operation, ensuring coaxiality of the valve stem rotation. It also assists in pressing the valve core, making the valve core and valve body sealing surface fit more tightly, improving the sealing effect at the valve core, and distributing the working force on the valve core, reducing transmission clearance, and making the valve opening and closing action more precise and stable, effectively improving the valve's operational stability and sealing reliability.

[0021] In one alternative embodiment, an annular boss is formed between the groove wall adjacent to the opening and the opening, and the side of the annular boss near the opening is inclined towards the opening of the annular groove along the groove bottom towards the groove opening.

[0022] Beneficial effects: By setting the side of the annular boss near the opening as a guide slope, the assembly process can be smoothly guided by the guide slope, allowing the annular boss to smoothly enter the assembly gap between the first protrusion and the second protrusion, simplifying the assembly process of the valve cover and the valve body and improving the accuracy of assembly alignment.

[0023] In one alternative embodiment, the first seal is sandwiched between the first protrusion and / or the valve body via a mounting groove formed on the first protrusion and / or the valve body.

[0024] Beneficial effects: By providing an installation groove on the first protrusion and / or valve body, the present invention confines the first seal within the installation groove, achieving precise positioning and reliable clamping of the first seal. This prevents displacement, extrusion, or deformation of the first seal under valve assembly, pressure, or temperature fluctuation conditions, ensuring the long-term stable sealing function of the first seal. Furthermore, the installation groove improves the assembly efficiency and consistency of the first seal, enhances the reliability of the first static seal between the valve body and valve cover, and further reduces the risk of media leakage. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a cross-sectional view of a plug valve according to an embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the valve body shown; Figure 3 for Figure 1 A magnified view of part M in the diagram; Figure 4 for Figure 1 A magnified view of N in the diagram; Figure 5 for Figure 1 A magnified view of a portion of P; Figure 6 for Figure 1 The diagram shows the structure of the plug valve.

[0027] Explanation of reference numerals in the attached figures: 1. Valve body; 101. Fluid passage; 102. Opening; 103. Annular groove; 104. Third limiting groove; 105. Annular boss; 2. Valve core; 201. Insertion groove; 3. Valve cover; 301. First protrusion; 302. Second protrusion; 303. Receiving groove; 304. Second limiting groove; 4. Valve stem; 401. First valve section; 402. Second valve section; 403. Insertion part; 404. Annular 5. Flange; 6. Dynamic seal; 501. Packing seal; 502. Packing gasket; 5021. Abutment part; 5022. Sealing part; 7. Static seal; 601. First seal; 602. Second seal; 8. First pressure plate; 9. First limiting groove; 10. Pressure sleeve; 11. Third seal; 12. Second pressure plate; 13. Bearing housing; 14. First bearing; 15. Sealing ring; 16. Bushing. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] The following is combined Figures 1 to 6 The following describes embodiments of the present invention.

[0030] According to embodiments of the present invention, such as Figures 1 to 3 As shown, a plug valve is provided, including: valve body 1, valve core 2, valve cover 3, valve stem 4, dynamic seal 5, and static seal 6.

[0031] Specifically, the valve body 1 has a fluid channel 101 inside, and the side wall of the valve body 1 has an opening 102 communicating with the fluid channel 101; the side wall of the valve body 1 also has an annular groove 103 surrounding the opening 102; the valve core 2 is assembled into the valve body 1 through the opening 102; the valve cover 3 is sealed at the opening 102, and the valve cover 3 has a first protrusion 301 and a second protrusion 302 on the side facing the valve body 1. The first protrusion 301 extends into the valve body 1 through the opening 102 and abuts against the valve core 2; the second protrusion 302 surrounds the periphery of the first protrusion 301 and... The valve stem 4 is spaced apart from the first protrusion 301; the second protrusion 302 is inserted into the annular groove 103; one end of the valve stem 4 is connected to the valve core 2, and the other end extends out of the valve cover 3; the valve stem 4 is used to drive the valve core 2 to rotate relative to the valve body 1 to control the opening and closing of the fluid channel 101; the dynamic seal 5 is disposed between the valve stem 4 and the valve cover 3; the static seal 6 includes a first seal 601 and a second seal 602, the first seal 601 is sandwiched between the first protrusion 301 and the valve body 1, and the second seal 602 is sandwiched between the second protrusion 302 and the annular groove 103.

[0032] This invention, through the provision of an annular groove 103 on the valve body 1 and the arrangement of a first protrusion 301 and a second protrusion 302 spaced apart on the valve cover 3, achieves both a firm fit between the valve core 2 and the valve body 1 by using the first protrusion 301 to abut against the valve core 2, ensuring a secure assembly position and a tight seal between the valve core 2 and the valve body 1, and precise alignment and installation of the valve cover 3 and valve body 1 by inserting the second protrusion 302 into the annular groove 103. Simultaneously, a double static sealing structure is formed by providing a first sealing element 601 and a second sealing element 602 at two mating locations, further enhanced by the arrangement of [missing information - likely related to sealing elements] between the valve stem 4 and the valve cover 3. The dynamic sealing element 5 forms a multi-layered and all-round sealing protection system, which can effectively resist the influence of complex working conditions such as temperature changes and pressure shocks, slow down the aging and loosening of the sealing element, greatly improve the overall sealing performance of the valve, and effectively reduce the possibility of leakage of the medium from the joint of valve body 1 and valve core 2, and valve body 1 and valve cover 3. In addition, the plug-in assembly structure is precise in positioning and convenient in disassembly and assembly. While ensuring sealing stability and reliability, it can also simplify the assembly process, improve assembly efficiency, and further extend the overall service life of the plug valve under various industrial pipeline working conditions.

[0033] Specifically, in this embodiment, such as Figure 3 As shown, along the axial direction of the valve stem 4, the length of the first protrusion 301 is greater than the length of the second protrusion 302.

[0034] Specifically, in this embodiment, such as Figure 3As shown, the first protrusion 301 and the second protrusion 302 are spaced apart, which means that an annular assembly gap will naturally form between them. Secondly, the valve body 1 is provided with an annular groove 103 surrounding the opening 102, which means that an annular boss 105 will naturally form between the groove wall of the annular groove 103 adjacent to the opening 102 and the opening 102. The annular boss 105 can be embedded in the annular assembly gap formed by the first protrusion 301 and the second protrusion 302. In this way, not only can the precise alignment between the valve cover 3 and the valve body 1 be achieved, but the medium permeation path can also be extended, and the blocking effect of the medium leaking towards the second seal 602 can be improved.

[0035] Understandable, such as Figure 3 As shown, in order to improve the assembly positioning and sealing barrier effect, the width of the annular boss 105 along the radial direction of the valve stem 4 is adapted to the width of the annular assembly gap.

[0036] Specifically, such as Figure 3 As shown, in this embodiment, the shape of the first boss is adapted to the shape of the opening 102, and the shape of the second boss is adapted to the shape of the annular groove 103.

[0037] Specifically, in this embodiment, the valve cover 3 can be fixed to the valve body 1 by fasteners. For example, the fasteners can be bolts and nuts.

[0038] Specifically, in this embodiment, the first sealing element 601 may be a lip ring, a plug ring, or an O-ring, and the second sealing element 602 may be a graphite gasket or a spiral wound gasket.

[0039] Furthermore, such as Figure 1 , Figure 3 as well as Figure 4As shown, the plug valve also includes a first pressure plate 7 located on the side of the valve cover 3 away from the valve body 1. The first pressure plate 7 is movably sleeved on the valve stem 4. The valve cover 3 is provided with a through hole for the valve stem 4 to pass through. The end of the valve cover 3 away from the valve body 1 is provided with a receiving groove 303 that communicates with the through hole. The connection between the receiving groove 303 and the through hole forms a stepped surface. The dynamic sealing element 5 is sandwiched between the first pressure plate 7 and the stepped surface and fills the receiving groove 303. It is understood that, in this embodiment of the invention, by providing a receiving groove 303 with a through hole at the end of the valve cover 3 and forming a stepped surface, the dynamic seal 5 is placed in the receiving groove 303, and then the first pressure plate 7, which is movably sleeved on the valve stem 4, is used to press and limit the dynamic seal 5. This not only achieves precise positioning and stable storage of the dynamic seal 5, preventing it from shifting or coming off during the rotation of the valve stem 4, but also, with the pressing action of the first pressure plate 7, makes the dynamic seal 5 fit tightly against the outer wall of the valve stem 4 and the inner wall of the receiving groove 303, further enhancing the dynamic sealing effect at the valve stem 4, effectively compensating for the wear gap of the dynamic seal 5, and adapting to the rotational motion of the valve stem 4. At the same time, by using the first pressure plate 7 to press and limit the dynamic seal 5, the pressing force on the dynamic seal 5 can be flexibly adjusted, maintaining the sealing stability of the valve stem 4 for a long time, and further reducing the risk of the medium leaking out along the gap of the valve stem 4.

[0040] Specifically, in this embodiment, the first pressure plate 7 is movably sleeved on the valve stem 4, meaning that the first pressure plate 7 can move relative to the valve stem 4 along the axial direction of the valve stem 4.

[0041] Specifically, in this embodiment, the first pressure plate 7 can directly abut against the dynamic seal 5 through its own structure, or it can indirectly abut against the dynamic seal 5 with the help of other components, as long as the force of the first pressure plate 7 can be effectively transmitted to the dynamic seal 5 to achieve the pressing and limiting of the dynamic seal 5.

[0042] Furthermore, such as Figure 1 and Figure 4As shown, the first pressure plate 7 is set on the valve cover 3 by fasteners. A pressure sleeve 8 is provided between the first pressure plate 7 and the dynamic seal 5. The pressure sleeve 8 is slidably sleeved on the valve stem 4, and one end of the pressure sleeve 8 abuts against the first pressure plate 7, and the other end abuts against the dynamic seal 5. A first limiting groove 701 is provided on the side of the first pressure plate 7 facing the pressure sleeve 8. A portion of the pressure sleeve 8 is inserted into the first limiting groove 701 and abuts against the bottom and wall of the first limiting groove 701. It is understood that in this embodiment of the invention, the first pressure plate 7 is securely mounted on the valve cover 3 using fasteners, and a pressure sleeve 8, which is slidably fitted onto the valve stem 4, is added between the first pressure plate 7 and the dynamic seal 5 for force transmission and compression. This allows the compression force to be applied evenly to the entire dynamic seal 5, avoiding uneven stress and local deformation failure caused by single-point pressure. At the same time, the first limiting groove 701 on the first pressure plate 7 limits the insertion and positioning of the pressure sleeve 8, effectively restricting radial and circumferential displacement of the pressure sleeve 8, ensuring that the pressure sleeve 8 always remains coaxial with the valve stem 4, thereby ensuring tight fit and balanced force distribution throughout the dynamic seal 5. In this way, not only is the stability and uniformity of the dynamic seal improved during the rotation of the valve stem 4, but abnormal wear of the dynamic seal 5 is also reduced, extending the service life of the dynamic seal 5, thereby further optimizing the sealing and protection effect at the valve stem 4 position.

[0043] Specifically, in this embodiment, the pressure sleeve 8 is slidably sleeved on the valve stem 4, which means that the pressure sleeve 8 can move relative to the valve stem 4 along the axial direction of the valve stem 4.

[0044] For example, in this embodiment, the fasteners can be bolts and nuts. It can be understood that by adjusting the position of the nut on the bolt, the clamping force applied by the first pressure plate 7 to the pressure sleeve 8 can be flexibly changed, thereby controlling the pre-tightening pressure of the pressure sleeve 8 on the dynamic seal 5, and thus realizing convenient adjustment of the sealing clamping force.

[0045] Furthermore, such as Figure 3As shown, the dynamic seal 5 consists of a packing seal 501 and a packing gasket 502. The packing gasket 502 is fitted onto the valve stem 4. The packing gasket 502 includes an abutment portion 5021 and a sealing portion 5022. The abutment portion 5021 is in contact with the stepped surface. The packing seal 501 is sandwiched between the abutment portion 5021 and the pressure sleeve 8. The sealing portion 5022 is located on the side of the abutment portion 5021 facing the valve core 2 and is sandwiched between the valve stem 4 and the wall of the through hole. It is understood that in this embodiment of the invention, the dynamic sealing element 5 is configured as a combination structure of a packing seal 501 and a packing gasket 502. The abutment portion 5021 of the packing gasket 502 adheres to the stepped surface to achieve positioning support, and the sealing portion 5022 adheres to the valve stem 4 and the through hole wall to complete the internal basic seal. The packing seal 501 is then sandwiched between the packing gasket 502 and the pressure sleeve 8 to bear the compressive force. This allows the sealing force to be transmitted evenly in sequence, ensuring the sealing effect of the packing gasket 502 on the radial gap of the valve stem 4, and also allowing the packing seal 501 to fully fill the sealing gap, adapting to the rotation of the valve stem 4. This effectively improves the dynamic sealing tightness at the valve stem 4, while also dispersing the working pressure and friction loss, slowing down the wear rate of the sealing components, and avoiding the problems of poor sealing and concentrated stress damage that are prone to occur with a single sealing structure. This further improves the sealing stability and service life of the valve stem 4.

[0046] For example, the packing seal 501 may be, but is not limited to, modified PTFE conventional structure packing, V-type combined structure V-type packing group, NEWAY low leakage packing, and metal wire-reinforced packing.

[0047] Furthermore, such as Figure 3 As shown, the plug valve also includes a third sealing element 9. The third sealing element 9 is sandwiched between the valve stem 4 and / or the through hole wall through an assembly groove formed on the valve stem 4 and / or the through hole wall. The third sealing element 9 is located on the side of the sealing part 5022 near the valve core 2. It can be understood that by adding a third sealing element 9 located on the side of the sealing part 5022 near the valve core 2 between the valve stem 4 and the through hole wall, and using the assembly groove formed on the valve stem 4 and / or the through hole wall for positioning and installation, an additional sealing barrier can be formed on the basis of the original dynamic seal. This effectively prevents the medium from leaking outward along the valve stem 4, improves the sealing level and sealing reliability at the valve stem 4, and at the same time, the assembly groove can play a stabilizing and limiting role for the third sealing element 9, preventing the third sealing element 9 from shifting or falling off during the valve opening and closing process, and ensuring the sealing effect under long-term operation.

[0048] For example, the third seal 9 can be made of fluororubber O-ring. This seal has excellent resistance to acid and alkali corrosion, can be adapted to thousands of chemical media conditions, can operate stably for a long time in a high temperature environment of up to 260°C, and also has excellent anti-burst and anti-tear properties.

[0049] In some embodiments, such as Figure 1 , Figure 5 as well as Figure 6 As shown, the plug valve also includes a second pressure plate 10 located on the side of the valve cover 3 away from the valve body 1. The valve stem 4 has a first valve section 401 and a second valve section 402 coaxially arranged at the end away from the valve core 2. The first valve section 401 is located at the end of the valve stem 4, and the diameter of the first valve section 401 is smaller than the diameter of the second valve section 402. A bearing seat 11 is provided at the connection between the first valve section 401 and the second valve section 402. The second pressure plate 10 is sleeved on the first valve section 401. A first bearing 12 sleeved on the first valve section 401 is sandwiched between the second pressure plate 10 and the bearing seat 11. It is understood that by setting the end of the valve stem 4 into a first valve section 401 and a second valve section 402 with different diameters, and setting a bearing seat 11 at the connection of the two valve sections, the bearing seat 11 can be quickly installed and positioned. Furthermore, with the second pressure plate 10 and the first bearing 12 sleeved on the first valve section 401, on the one hand, the second pressure plate 10 can apply a stable axial clamping force to the valve stem 4, causing the valve core 2 to fit tightly against the sealing surface of the valve body 1, effectively improving the sealing performance of the valve core 2 and reducing the risk of media leakage. On the other hand, the first bearing 12 can reduce the frictional resistance during the rotation of the valve stem 4, reduce the operating torque required for valve opening and closing, solve the problem of large opening and closing torque and difficult operation of traditional plug valves, and make the valve opening and closing action more convenient and smooth. At the same time, the first bearing 12 can play a coaxial limiting role for the valve stem 4, suppress the wobbling and shaking when the valve stem 4 rotates, improve the smoothness of valve stem 4 operation, and extend the overall service life of the valve.

[0050] Specifically, in this embodiment, such as Figure 1 As shown, the end of the valve stem 4 is the end of the valve stem 4 that is away from the valve core 2.

[0051] Specifically, in this embodiment, the first bearing 12 can be a planar bearing, a ball bearing, or a thrust ball bearing.

[0052] It should be noted that, since the valve stem 4 needs to drive the valve core 2 to complete the rotational opening and closing action, in this embodiment, the first valve section 401 corresponding to the valve stem 4 can rotate relative to the second pressure plate 10.

[0053] It needs to be further explained that, such as Figure 1 and Figure 6As shown, when both the first pressure plate 7 and the second pressure plate 10 are provided on the valve cover 3, the second pressure plate 10 is located on the side of the first pressure plate 7 away from the valve cover 3. That is, the two are arranged at intervals along the axial direction of the valve stem 4, with a regular structural layout and no interference between them. The first pressure plate 7 is mainly used to press the dynamic sealing element 5 between the valve stem 4 and the valve cover 3, stabilize the sealing structure, and ensure the dynamic sealing performance during the rotation of the valve stem 4. The second pressure plate 10, together with the first bearing 12, forms a rotational support for the valve stem 4, and can also adjust the axial pressing force of the valve core 2 to ensure the fit and sealing between the valve core 2 and the fluid channel 101.

[0054] It is evident that the layered arrangement of the first pressure plate 7 and the second pressure plate 10 not only rationally divides the assembly space and effectively avoids structural interference problems during component assembly and operation, but also allows for online adjustment of the sealing tightness of the plug valve and the contact state of the valve core 2 by relying on the adjustment structure of the two sets of pressure plates. It also facilitates online inspection and replacement of vulnerable components such as internal seals and bearings without disassembling the entire valve body 1, thereby improving equipment debugging efficiency and subsequent maintenance convenience.

[0055] Furthermore, such as Figure 1 and Figure 6 As shown, in order to make full use of the space above the valve cover 3, the first pressure plate 7 and the second pressure plate 10 are set at an angle in the radial direction of the valve stem 4, preferably at 90 degrees.

[0056] Furthermore, such as Figure 5 As shown, the second pressure plate 10 is mounted on the valve cover 3 by fasteners. The second pressure plate 10 also contains a second bearing sleeved on the first valve section 401; and / or, the bearing seat 11 contains a sealing ring 13, located on the side of the first bearing 12 closest to the valve cover 3. It can be understood that by mounting the second pressure plate 10 on the valve cover 3 with fasteners, the operator can easily adjust the clamping force of the second pressure plate 10, thereby controlling the tightness of the seal between the valve core 2 and the valve body 1 online and maintaining a good sealing effect. Simultaneously, the addition of a second bearing inside the second pressure plate 10, combined with the original first bearing 12, forms a double-bearing support structure. This effectively reduces the frictional resistance during the rotation of the valve stem 4, reduces the operating force required for valve opening and closing, making valve operation easier and smoother, and also precisely corrects the coaxiality of the valve stem 4 rotation, suppressing any deviation or shaking during operation. In addition, the sealing ring 13 installed inside the bearing housing 11 can not only prevent the working medium, dust and moisture from entering the bearing installation area, preventing the bearing from rusting and jamming, but also retain internal lubricating grease, ensuring the long-term stable operation of the bearing and effectively extending the service life of various bearings.

[0057] For example, in this embodiment, the fasteners can be bolts and nuts. It can be understood that by adjusting the position of the nut on the bolt, the clamping force applied by the second pressure plate 10 to the valve stem 4 can be flexibly changed, thereby controlling the pre-tightening pressure of the valve stem 4 on the valve core 2, and thus achieving convenient adjustment of the sealing clamping force.

[0058] In some embodiments, such as Figure 3 As shown, the valve stem 4 has a plug-in part 403 at one end near the valve core 2, and the valve core 2 has a plug-in groove 201. The plug-in part 403 is plugged into the plug-in groove 201. The valve cover 3 has a through hole for the valve stem 4 to pass through. The first protrusion 301 has a second limiting groove 304 that communicates with the through hole. The connection between the second limiting groove 304 and the through hole forms a limiting step. The valve stem 4 has an annular flange 404 on its peripheral side wall near the plug-in part 403. The annular flange 404 abuts against the limiting step, the groove wall of the second limiting groove 304, and the valve core 2, respectively. It is understood that, in this embodiment of the invention, the valve stem 4 end plug-in portion 403 is engaged with the valve core 2 plug-in groove 201, enabling the valve stem 4 and valve core 2 to be quickly and accurately aligned and assembled, stably transmitting rotational torque and ensuring synchronous rotation. Simultaneously, the annular flange 404 on the valve stem 4 abuts against and limits the valve cover 3's limiting step, the second limiting groove 304's groove wall, and the valve core 2, respectively. This provides both axial and radial bidirectional positioning constraints on the valve stem 4, effectively limiting axial movement and radial offset during operation, ensuring the valve stem 4's coaxiality, and also assisting in pressing the valve core 2, making the valve core 2 and valve body 1's sealing surface fit more tightly, improving the sealing effect of the valve core 2. Furthermore, it shares the working force of the valve core 2, reducing transmission clearance, making the valve opening and closing action more precise and stable, and effectively improving the valve's operational stability and sealing reliability.

[0059] In some embodiments, such as Figure 3 As shown, an annular boss 105 is formed between the groove wall of the annular groove 103 and the opening 102. Along the groove bottom of the annular groove 103 towards the groove opening, the side of the annular boss 105 near the opening 102 is inclined towards the groove opening of the annular groove 103. It can be understood that by setting the side of the annular boss 105 near the opening 102 as a guide slope, the assembly can be smoothly guided by the guide slope, allowing the annular boss 105 to smoothly enter the assembly gap between the first protrusion 301 and the second protrusion 302, simplifying the assembly process of the valve cover 3 and the valve body 1 and improving the assembly alignment accuracy. At the same time, during the process of the annular boss 105 being embedded in the above-mentioned gap, the second protrusion 302 can simultaneously extend into the interior of the annular groove 103, forming a stable nested fit with the groove wall of the annular groove 103.

[0060] In some embodiments, such as Figure 3As shown, the first seal 601 is clamped between the first protrusion 301 and / or the valve body 1 via a mounting groove formed on the first protrusion 301 and / or the valve body 1. It can be understood that by providing a mounting groove on the first protrusion 301 and / or the valve body 1, the first seal 601 is confined within the mounting groove, achieving precise positioning and reliable clamping of the first seal 601. This prevents the first seal 601 from shifting, being extruded, or deforming under valve assembly, pressure, or temperature fluctuation conditions, ensuring the long-term stable sealing function of the first seal 601. Furthermore, the mounting groove improves the assembly efficiency and consistency of the first seal 601, enhances the reliability of the first static seal between the valve body 1 and the valve cover 3, and further reduces the risk of media leakage.

[0061] In some embodiments, such as Figure 1 and Figure 2 As shown, a third limiting groove 104 is provided on the inner wall of the fluid channel 101 opposite to the opening 102 of the valve body 1. A portion of the valve core 2 is located in the third limiting groove 104. Along the axial direction of the valve stem 4, there is a gap between the valve core 2 and the bottom of the third limiting groove 104. A bushing 14 is provided between the valve core 2 and the inner wall of the opening 102 and the groove wall of the third limiting groove 104, respectively. Ribs are provided in the areas corresponding to the bushing 14 of the inner wall of the opening 102 and the groove wall of the third limiting groove 104.

[0062] It is understood that, in this embodiment of the invention, by providing a third limiting groove 104 inside the fluid channel 101 of the valve body 1, the valve core 2 is partially embedded therein, with an axial gap reserved between them. This not only provides reliable limiting and guiding for the valve core 2, but also avoids jamming caused by hard resistance during operation. Bushings 14 are respectively provided between the valve core 2 and the inner wall of the opening 102, and between the groove wall of the third limiting groove 104, with ribs provided in corresponding areas. This reduces direct friction between the valve core 2 and the valve body 1, lowers opening and closing resistance, and simultaneously utilizes the cooperation between the ribs and the bushings 14 to form a stable support and guiding structure, extending the service life of the bushings 14 and the valve body 1, and improving the sealing reliability and operational consistency of the valve.

[0063] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A plug valve, characterized in that, include: The valve body (1) has a fluid channel (101) inside. The side wall of the valve body (1) has an opening (102) that communicates with the fluid channel (101). The side wall of the valve body (1) also has an annular groove (103) surrounding the opening (102). The valve core (2) is assembled into the valve body (1) through the opening (102); A valve cover (3) is provided with a sealing cover at the opening (102). The valve cover (3) has a first protrusion (301) and a second protrusion (302) on the side facing the valve body (1). The first protrusion (301) extends through the opening (102) into the valve body (1) and abuts against the valve core (2). The second protrusion (302) surrounds the periphery of the first protrusion (301) and is spaced apart from the first protrusion (301). The second protrusion (302) is inserted into the annular groove (103). The valve stem (4) is connected at one end to the valve core (2) and extends through the valve cover (3) at the other end; the valve stem (4) is used to drive the valve core (2) to rotate relative to the valve body (1) in order to control the opening and closing of the fluid passage (101); A dynamic seal (5) is disposed between the valve stem (4) and the valve cover (3); The static sealing element (6) includes a first sealing element (601) and a second sealing element (602). The first sealing element (601) is sandwiched between the first protrusion (301) and the valve body (1), and the second sealing element (602) is sandwiched between the second protrusion (302) and the annular groove (103).

2. The plug valve according to claim 1, characterized in that, The plug valve further includes a first pressure plate (7) located on the side of the valve cover (3) away from the valve body (1), the first pressure plate (7) being movably sleeved on the valve stem (4); the valve cover (3) is provided with a through hole for the valve stem (4) to pass through, and the end of the valve cover (3) away from the valve body (1) is provided with a receiving groove (303) communicating with the through hole, the receiving groove (303) and the through hole forming a stepped surface, and the dynamic sealing element (5) is sandwiched between the first pressure plate (7) and the stepped surface and fills the receiving groove (303).

3. The plug valve according to claim 2, characterized in that, The first pressure plate (7) is fastened to the valve cover (3) by fasteners. A pressure sleeve (8) is provided between the first pressure plate (7) and the dynamic seal (5). The pressure sleeve (8) is slidably sleeved on the valve stem (4). One end of the pressure sleeve (8) abuts against the first pressure plate (7) and the other end abuts against the dynamic seal (5). The first pressure plate (7) has a first limiting groove (701) on the side facing the pressure sleeve (8). A portion of the pressure sleeve (8) is inserted into the first limiting groove (701) and abuts against the bottom and wall of the first limiting groove (701).

4. The plug valve according to claim 3, characterized in that, The dynamic sealing element (5) is a packing seal (501) and a packing gasket (502). The packing gasket (502) is sleeved on the valve stem (4). The packing gasket (502) includes an abutment portion (5021) and a sealing portion (5022). The abutment portion (5021) is in contact with the stepped surface. The packing seal (501) is sandwiched between the abutment portion (5021) and the pressure sleeve (8). The sealing portion (5022) is located on the side of the abutment portion (5021) facing the valve core (2) and is sandwiched between the valve stem (4) and the hole wall of the through hole.

5. The plug valve according to claim 4, characterized in that, The plug valve also includes a third seal (9), which is sandwiched between the valve stem (4) and / or the through hole wall by a mounting groove formed thereon, and the third seal (9) is located on the side of the sealing part (5022) near the valve core (2).

6. The plug valve according to claim 1, characterized in that, The plug valve further includes a second pressure plate (10) located on the side of the valve cover (3) away from the valve body (1). The valve stem (4) has a first valve section (401) and a second valve section (402) coaxially arranged at the end away from the valve core (2). The first valve section (401) is located at the end of the valve stem (4), and the diameter of the first valve section (401) is smaller than the diameter of the second valve section (402). A bearing seat (11) is provided at the connection between the first valve section (401) and the second valve section (402). The second pressure plate (10) is sleeved on the first valve section (401). A first bearing (12) sleeved on the first valve section (401) is sandwiched between the second pressure plate (10) and the bearing seat (11).

7. The plug valve according to claim 6, characterized in that, The second pressure plate (10) is mounted on the valve cover (3) by fasteners, and the second pressure plate (10) is also provided with a second bearing sleeved on the first valve section (401); And / or, the bearing housing (11) is also provided with a sealing ring (13), which is located on the side of the first bearing (12) near the valve cover (3).

8. The plug valve according to any one of claims 1 to 7, characterized in that, The valve stem (4) has a plug-in part (403) at one end near the valve core (2), and the valve core (2) has a plug-in groove (201). The plug-in part (403) is inserted into the plug-in groove (201). The valve cover (3) has a through hole for the valve stem (4) to pass through. The first protrusion (301) has a second limiting groove (304) that communicates with the through hole. The second limiting groove (304) and the through hole form a limiting step. The valve stem (4) has an annular flange (404) on its peripheral sidewall near the plug-in part (403). The annular flange (404) abuts against the limiting step, the groove wall of the second limiting groove (304), and the valve core (2).

9. The plug valve according to any one of claims 1 to 7, characterized in that, An annular boss (105) is formed between the groove wall of the annular groove (103) adjacent to the opening (102) and the opening (102). Along the groove bottom of the annular groove (103) towards the groove opening, the side of the annular boss (105) near the opening (102) is inclined towards the groove opening of the annular groove (103).

10. The plug valve according to any one of claims 1 to 7, characterized in that, The first seal (601) is sandwiched between the first protrusion (301) and / or the valve body (1) by a mounting groove formed on the first protrusion (301).

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