Hydraulic seal wear-resistant pneumatic ball valve

Abstract

This invention relates to a hydraulically sealed, wear-resistant pneumatic ball valve, comprising a valve body assembly including a valve seat, a valve core, a valve stem, and a pneumatic actuator. The valve core is rotatably disposed inside the valve seat, and one end of the valve core is fixed to the valve stem. The other end of the valve stem passes through the valve seat and connects to the pneumatic actuator, with the valve stem rotatably connected to the valve seat. The lower side of the pneumatic actuator is detachably connected to the valve core. The valve core includes a main body, a deformable component, and a support component. The deformable component is fixedly connected to the main body, and one axial end of the support component is fixedly connected to the main body, while the other axial end of the support component is fixedly connected to the deformable component. Through the cooperation of the main body, the deformable component, and the support component, under hydraulic pressure, the support component provides axial support for the deformable component, and the deformable component deforms under force to extend and press against the valve seat sealing surface, thereby effectively improving the sealing performance and wear resistance of the pneumatic ball valve under hydraulic conditions.

Description

Technical Field

[0001] This invention belongs to the field of ball valve technology, specifically relating to a hydraulically sealed wear-resistant pneumatic ball valve. Background Technology

[0002] Pneumatic ball valves are key actuators in industrial pipeline systems for controlling the flow of media. They mainly consist of a valve body, valve core, valve seat, valve stem, and pneumatic actuator. The sealing between the valve core and valve seat is achieved through preload and media pressure.

[0003] Traditional pneumatic ball valves maintain relatively stable sealing performance under normal temperature, clean, and low-pressure conditions. However, under harsh conditions such as high temperature, high pressure, high-frequency opening and closing, or media containing particulate impurities, dry friction and erosion by hard particles can easily occur between the ball and the valve seat sealing surface, leading to scratches, scoring, and pitting damage. Simultaneously, the sealing pair is subjected to abrasive effects during frequent opening and closing, causing the valve seat to soften, deform, or experience accelerated wear, and the wear-resistant layer on the ball surface to gradually peel off. This wear and deformation reduces the fit accuracy between the ball and the valve seat, resulting in uneven sealing pressure distribution and ultimately causing external or internal leakage failure of the valve.

[0004] Traditional pneumatic ball valves suffer from poor valve core sealing and wear resistance under harsh conditions of high temperature and high pressure, leading to valve leakage, failure, and shortened service life. To address this issue, there is an urgent need for a pneumatic ball valve design that can simultaneously improve valve core sealing and wear resistance under harsh conditions, ensuring the safe and stable operation of industrial pipeline systems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of poor sealing and wear resistance of ball valve core under harsh working conditions of high temperature and high pressure in the prior art, thereby providing a hydraulically sealed wear-resistant pneumatic ball valve.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A hydraulically sealed wear-resistant pneumatic ball valve, comprising: The valve body assembly includes a valve seat, a valve core, a valve stem, and a pneumatic actuator. The valve core is rotatably disposed inside the valve seat. The valve core is fixed to one end of the valve stem. The other end of the valve stem passes through the valve seat and is fixedly connected to the pneumatic actuator. The valve is rotatably connected to the valve seat. The lower side of the pneumatic actuator is detachably connected to the valve core. The valve core includes a main body, a deformable element, and a support element. The deformable element is fixedly connected to the main body, one end of the support element along the axial direction is fixed to the main body, and the other end of the support element along the axial direction is fixedly connected to the deformable element.

[0007] Preferably, the main body is provided with a plurality of first mounting grooves on both sides along the axial direction of the flow channel. The first mounting grooves correspond one-to-one with the support members. The support members are disposed in the first mounting grooves, and the axial length of the support members is greater than the axial length of the first mounting grooves.

[0008] Preferably, the main body further includes a second mounting groove, which is disposed on the outer surface of the main body and extends radially outward, wherein the projection of the second mounting groove coincides with the projection of the first mounting groove.

[0009] Preferably, the main body further includes a first wear-resistant part, which is disposed in the middle of the outer ring surface of the main body and abuts against the valve seat; The first wear-resistant part has rounded corners on both sides of its radial edge.

[0010] Preferably, the main body further includes two second wear-resistant parts, which are symmetrically arranged on both sides of the first wear-resistant part along the flow channel and fixedly connected to the first wear-resistant part, and each second wear-resistant part has rounded corners at both sides of its radial edge.

[0011] Preferably, the outer edge of the first wear-resistant part, the outer edge of the second wear-resistant part, and the outer edge of the deformable part are all located in the same annular surface.

[0012] Preferably, the deformable part is convex in the direction away from the first wear-resistant part, and one end of the support member is fixedly connected to the convex part of the deformable part along the axial direction, and is spaced apart from the side of the deformable part away from the first wear-resistant part.

[0013] Preferably, the deformable part is made of a flexible material, and the hardness of both the second wear-resistant part and the first wear-resistant part is greater than the hardness of the main body.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The hydraulically sealed wear-resistant pneumatic ball valve provided in the above technical solution effectively improves the valve's overall performance under hydraulic conditions through the coordinated operation of various components in the valve body assembly. The valve core is rotatably mounted inside the valve seat, and is fixedly connected to one end of the valve stem. The other end of the valve stem passes through the valve seat and connects to the pneumatic actuator. During operation, the pneumatic actuator drives the valve core to rotate within the valve seat via the valve stem, achieving valve opening and closing control. Simultaneously, the lower side of the pneumatic actuator is detachably connected to the valve core, facilitating valve core disassembly and maintenance, reducing maintenance difficulty and cost. Through the cooperation of the main body, deformable component, and support component, under hydraulic action, the support component provides reliable axial support for the deformable component, preventing displacement or excessive deformation. After deformation under force, the deformable component extends outward and presses against the sealing surface of the valve seat, allowing the sealing fit between the valve core and the valve seat to adaptively compensate according to the hydraulic pressure. The valve maintains reliable sealing performance even under hydraulic shock conditions, improving the sealing performance of the pneumatic ball valve under hydraulic conditions. Attached Figure Description

[0015] 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 based on these drawings without creative effort. Figure 1 A cross-sectional view of the assembly structure of the hydraulically sealed wear-resistant pneumatic ball valve provided by the present invention; Figure 2 This is a schematic diagram of the overall assembly structure of the valve core provided by the present invention; Figure 3 A schematic diagram of the main body provided by the present invention; Figure 4 This is a cross-sectional view of the overall assembly structure of the valve core provided by the present invention; Figure 5 This is a schematic diagram of the structure of the deformable component provided by the present invention.

[0016] Explanation of reference numerals in the attached figures: 1. Valve body assembly; 11. Valve seat; 12. Valve core; 121. Main body; 1211. First mounting groove; 1212. Second mounting groove; 1213. First wear-resistant part; 1214. Second wear-resistant part; 122. Deformable part; 123. Support part; 13. Valve stem; 14. Pneumatic actuator. Detailed Implementation

[0017] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0018] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] like Figure 1 As shown, this embodiment 1 provides a hydraulically sealed wear-resistant pneumatic ball valve, including a valve body assembly 1, which includes a valve seat 11, a valve core 12, a valve stem 13, and a pneumatic actuator 14.

[0021] The valve seat 11 is fixedly installed inside the housing of the valve body assembly 1, and the inner wall surface of the valve seat 11 forms a sealing surface that mates with the outer surface of the valve core 12. To improve the hardness and wear resistance of the sealing surface, in this embodiment, the valve seat 11 is integrally machined from stainless steel, and a cobalt-based wear-resistant alloy sealing layer is deposited on its inner wall surface. The surface of the sealing layer is ground and polished to give the sealing surface high dimensional accuracy and surface finish, thereby forming a precise spherical sealing pair with the outer surface of the valve core 12.

[0022] The valve core 12 is rotatably mounted inside the valve seat 11. The valve core 12 is spherical in shape, with a flow channel extending axially through its interior. The two ends of the flow channel connect to the upstream and downstream pipes, respectively. When the flow channel axis of the valve core 12 coincides with the pipe axis, the valve is fully open; when the valve core 12 rotates 90° and the flow channel axis is perpendicular to the pipe axis, the valve is closed. The valve core 12 is fixed to one end of the valve stem 13. In this embodiment, a mounting hole is provided at the top of the valve core 12, and the lower end of the valve stem 13 extends into the mounting hole. A flat key and a set screw are used for circumferential positioning and axial locking, creating a detachable connection between the valve stem 13 and the valve core 12. This facilitates the removal of the valve core 12 from the valve seat 11 for replacement or repair during maintenance. The other end of the valve stem 13 passes through the valve seat 11 and is connected to the pneumatic actuator 14. That is, the upper end of the valve stem 13 is fixedly connected to the lower side of the pneumatic actuator 14, thereby enabling a detachable connection between the lower side of the pneumatic actuator 14 and the valve core 12. To ensure the sealing of the rotatable connection between the valve stem 13 and the valve seat 11 and to prevent leakage of the medium along the valve stem 13, a stuffing box is provided at the through hole on the valve seat 11 corresponding to the valve stem 13. The stuffing box is filled with flexible graphite sealing packing and is tightened by a packing gland. The pneumatic actuator 14 preferably adopts a rack and pinion pneumatic actuator or a piston cylinder. During operation, compressed air is introduced to drive the output shaft to rotate, which in turn drives the valve stem 13 to rotate, realizing remote automatic opening and closing control of the valve. Since the lower side of the pneumatic actuator 14 and the valve core 12 are detachably connected through the valve stem 13, the disassembly and maintenance of the valve core 12 are very convenient, reducing the difficulty of inspection and maintenance costs.

[0023] Continue to refer to Figure 2 , Figure 3 and Figure 4 The valve core 12 includes a main body 121, a deformable part 122, and a support part 123.

[0024] The main body 121 is the skeleton structure of the valve core 12, and is spherical. The main body 121 is made of 316L stainless steel, which has good corrosion resistance and sufficient structural strength. A flow channel is axially oriented through the interior of the main body 121. Multiple first mounting grooves 1211 are provided on both sides of the main body 121 along the axial direction of the flow channel. In this embodiment, there are four first mounting grooves 1211, which are evenly distributed on the outer ring surface of both sides of the flow channel along the circumference of the main body 121. Each first mounting groove 1211 extends radially inward from the outer surface of the main body 121. Each first mounting groove 1211 corresponds to a support member 123. The support member 123 is disposed within the first mounting groove 1211, and the axial length of the support member 123 is greater than the axial length of the first mounting groove 1211. Because the axial length of the support member 123 is greater than the axial length of the first mounting groove 1211, one end of the support member 123 is embedded and fixed to the bottom of the first mounting groove 1211, and the other end extends out of the opening of the first mounting groove 1211 and extends to the deformable member 122 for fixed connection. This ensures that there is sufficient connection and support length between the support member 123 and the deformable member 122, so that the support member 123 can stably and reliably provide axial support for the deformable member 122, and prevent the support member 123 from coming out of the first mounting groove 1211 or becoming loose and failing under hydraulic impact.

[0025] The main body 121 also includes a second mounting groove 1212, which is disposed on the outer surface of the main body 121 and extends radially outward. The projection of the second mounting groove 1212 coincides with the projection of the first mounting groove 1211. In other words, the second mounting groove 1212 is located radially outside the first mounting groove 1211, and the two are arranged along the same radial direction with overlapping projections, forming an inner and outer stepped fitting space on the outer ring surface of the main body 121. The deformable member 122 is fitted and fixed in the second mounting groove 1212. The deformable member 122 and the second mounting groove 1212 are interference-fitted and bonded together with high-temperature resistant sealant. The interference fit ensures the firmness of the connection between the deformable part 122 and the main body 121, preventing the deformable part 122 from circumferentially shifting or axially sliding under long-term alternating hydraulic loads. On the other hand, the tight contact surface formed at the interference fit effectively seals the assembly gaps, preventing high-pressure medium from seeping into the valve core 12 along the space between the deformable part 122 and the second mounting groove 1212, thus preventing internal leakage and improving the sealing reliability of the assembly.

[0026] The deformable element 122 is made of a flexible material, preferably one of fluororubber, nitrile rubber, or polyurethane elastomer. In this embodiment, the deformable element 122 is made of fluororubber. Fluororubber has excellent high-temperature resistance, media resistance, and high elasticity, and can maintain stable elastic deformation capability for a long time under high-temperature and high-pressure hydraulic conditions. The deformable element 122 is convex in the direction away from the first wear-resistant part 1213, that is, the deformable element 122 protrudes outward on the side facing the flow channel to form an outward protrusion, which protrudes into the interior of the flow channel. When the liquid in the pipeline flows through the flow channel in the valve core 12, the liquid will impact the outward protrusion of the deformable element 122, providing a power source for the extension deformation of the deformable element 122.

[0027] The support member 123 is preferably a spring, and in this embodiment 1, the support member 123 is a stainless steel compression spring. One end of the support member 123 along the axial direction is fixedly connected to the main body 121, that is, it is embedded and fixed in the bottom of the first mounting groove 1211; the other end of the support member 123 along the axial direction is fixedly connected to the protruding part of the deformable member 122, specifically, the end of the spring is embedded in the protruding part of the deformable member 122 and vulcanized and fixed, so that a firm integrated connection is formed between the spring and the flexible material. Furthermore, the support member 123 and the deformable member 122 are spaced apart on the side away from the first wear-resistant part 1213. That is, the support member 123 is only connected to the inner convex part of the deformable member 122, and does not contact the outer surface of the deformable member 122 facing the sealing surface of the valve seat 11. This keeps the outer surface of the deformable member 122 intact, smooth and continuous, so that the outer surface of the deformable member 122 can fit flatly and closely with the inner wall of the valve seat 11. This prevents the support member 123 from creating a pit on the outer surface of the deformable member 122 and damaging the flatness of the sealing surface, thus ensuring that the sealing effect is not affected.

[0028] The technical effects of the support component 123 are mainly reflected in two aspects: First, it provides reliable axial support for the deformable component 122, preventing the deformable component 122 from shifting position or collapsing under hydraulic impact; Second, the spring has elastic recovery capability. When the deformable component 122 is subjected to excessive liquid impact, the spring can buffer and limit the deformation of the deformable component 122, preventing the deformation caused by excessive liquid impact from failing to reset itself; When the liquid impact disappears or weakens, the spring's restoring force pushes the deformable component 122 to spring back and reset, so that the deformable component 122 always maintains an elastic working state, ensuring that the deformable component 122 can always reliably extend and reset during repeated opening and closing of the valve, maintaining long-term stable sealing performance.

[0029] Refer to Figure 2 , Figure 3 and Figure 5The main body 121 also includes a first wear-resistant part 1213, which is disposed in the middle of the outer ring surface of the main body 121 and abuts against the valve seat 11. The first wear-resistant part 1213 has rounded corners on both sides of its radial edge; in this embodiment, the radius of the rounded corners is 0.5~2mm. The main body 121 also includes two second wear-resistant parts 1214, which are symmetrically arranged on both sides of the first wear-resistant part 1213 along the flow channel and fixedly connected to it. The edges of each second wear-resistant part 1214 also have rounded corners on both sides of its radial edge.

[0030] The hardness of both the first wear-resistant part 1213 and the second wear-resistant part 1214 is greater than that of the main body 121. Specifically, the main body 121 is made of 316L stainless steel with a surface hardness of approximately HB160~190; both the first wear-resistant part 1213 and the second wear-resistant part 1214 are made of cobalt-based Stellite alloy. For example, if a cobalt-based alloy is used, the hardness can reach HRC42~48, which is higher than that of the main body 121; the first wear-resistant part 1213 and the second wear-resistant part 1214 are fixed to the outer ring surface of the main body 121 by laser cladding or plasma spraying. A metallurgical bond is formed between the cladding layer and the substrate of the main body 121, which has high bonding strength and is not easy to peel off. Even if wear occurs after long-term service, the performance can be restored by re-cladding.

[0031] The first wear-resistant part 1213 is located in the middle of the outer ring surface of the main body 121. This middle area is the main contact area where the valve core 12 and the valve seat 11 sealing surface meet. During the valve opening and closing process, the valve core 12 rotates inside the valve seat 11, and relative sliding friction occurs between the middle ring of the outer ring surface of the main body 121 and the sealing surface of the valve seat 11. Since the first wear-resistant part 1213 is made of high-hardness cobalt-based alloy and directly bears friction and wear, its wear resistance is far superior to that of the stainless steel substrate of the main body 121. This effectively protects the main body 121 from wear, prevents the main body 121 from becoming out of round due to wear, reduces the sealing fit accuracy, and significantly extends the service life of the valve core 12.

[0032] The second wear-resistant part 1214 is symmetrically arranged on both sides of the first wear-resistant part 1213 along the flow channel, precisely covering the edge area of ​​the flow channel port. During the transition process of the valve opening or closing, the flow channel is in a semi-open state, and the medium flows through the semi-open flow channel port at high speed. The edge area of ​​the flow channel port is directly eroded by the high-speed fluid. When the medium contains particulate impurities, the abrasive wear in this area is particularly severe. The second wear-resistant part 1214 precisely covers and protects this area of ​​most severe erosion, directly bearing the erosion of the high-speed particulate fluid, and preventing the edge of the flow channel port of the main body 121 from being eroded into grooves and gaps, thus damaging the spherical profile accuracy.

[0033] The two second wear-resistant parts 1214 are arranged in a cross-symmetrical manner. No matter what rotation angle the valve core 12 is in, there are always second wear-resistant parts 1214 distributed in the scouring area at the edge of the flow channel, so that the scouring wear is evenly distributed in the circumferential direction, avoiding local wear concentration and rapid formation of local deep grooves, while ensuring that the wear resistance performance of the valve core 12 is balanced and consistent in all directions, together with the first wear-resistant part 1213, forming a complete wear-resistant protection system.

[0034] Both the first wear-resistant part 1213 and the second wear-resistant part 1214 have rounded edges. On the one hand, this prevents sharp edges from scratching the sealing surface of the valve seat 11 when the valve core 12 rotates, protecting the smoothness of the sealing surface of the valve seat 11 and preventing leakage channels from being formed after the sealing surface is scratched; on the other hand, it eliminates stress concentration at the edges, preventing the high-hardness wear-resistant layer from cracking and peeling off from the edges under alternating hydraulic impact; furthermore, the rounded edges allow the medium to transition smoothly when flowing through the edges, reducing the intensity of eddies and turbulence, reducing local scouring wear in the edge area, and reducing the flow resistance loss of the valve.

[0035] like Figure 5 As shown, the outer edge lines of the first wear-resistant part 1213, the second wear-resistant part 1214, and the deformable part 122 are all located within the same annular surface. That is, the outer surfaces of the first wear-resistant part 1213, the second wear-resistant part 1214, and the deformable part 122 together form a continuous, complete, and smooth spherical profile, and the outer edges of the three are located on the same annular surface. The advantages of this design are as follows: when the valve core 12 and the valve seat 11 are engaged, the outer surface of the valve core 12 and the inner wall of the valve seat 11 are continuously and uniformly fitted, and the sealing pressure is evenly distributed along the circumference. This avoids stress concentration and increased local wear due to local protrusions, as well as leakage gaps due to local depressions. At the same time, when the deformable part 122 is stretched by hydraulic impact, its stretched outer surface smoothly transitions with the outer surfaces of the first wear-resistant part 1213 and the second wear-resistant part 1214. There are no steps or misalignments at the fitting point with the inner wall of the valve seat 11, which avoids concentrated scouring of the step edges by the fluid and further improves the sealing reliability and wear resistance.

[0036] When the valve needs to be closed, compressed air is introduced into the pneumatic actuator 14, and its output shaft drives the valve stem 13 to rotate 90°. The valve stem 13 drives the valve core 12 to rotate 90° synchronously within the valve seat 11, making the flow channel axis of the valve core 12 perpendicular to the pipeline axis, thus cutting off the flow channel. At this time, the first wear-resistant part 1213 and the second wear-resistant part 1214 on the outer surface of the valve core 12, together with the deformation part 122, abut against the inner wall surface of the valve seat 11, forming an initial seal under the action of the assembly preload and the supporting force of the support part 123.

[0037] When the liquid pressure in the pipeline increases, the liquid flows through the flow channel inside the valve core 12, impacting the outward protrusion of the deformable element 122. The impact force pushes the deformable element 122 to undergo elastic deformation and extend outward. After extending, the deformable element 122 makes tight contact with the inner wall of the valve seat 11. The greater the hydraulic pressure and the stronger the impact, the greater the extension of the deformable element 122 and the greater the pressing force on the inner wall of the valve seat 11. That is, the sealing specific pressure increases adaptively with the hydraulic pressure, thereby achieving adaptive compensation for sealing performance, ensuring that the valve maintains reliable sealing under high pressure and hydraulic impact conditions, and preventing internal leakage.

[0038] During this process, the support member 123 provides axial support for the deformable part 122, preventing it from shifting or collapsing after impact. Simultaneously, the elastic buffer of the spring limits the deformation of the deformable part 122, preventing it from undergoing excessive plastic deformation due to impact and failing to reset itself. When the impact disappears, the spring pushes the deformable part 122 back to its original position, ensuring reliable sealing during the next valve opening and closing. Throughout the opening and closing process, the first wear-resistant part 1213 bears the sliding friction wear between itself and the sealing surface of the valve seat 11, while the second wear-resistant part 1214 resists the scouring wear of high-speed particulate fluid at the edge of the flow channel. The rounded edges prevent scratching the sealing surface of the valve seat 11 and prevent the wear-resistant layer from cracking. The first wear-resistant part 1213 and the second wear-resistant part 1214 together protect the main body 121 from wear. The adaptive sealing compensation of the deformable part 122 and the wear-resistant protection of the wear-resistant part work together to enable the pneumatic ball valve to simultaneously obtain excellent sealing performance and wear resistance under harsh working conditions such as high temperature, high pressure, high frequency opening and closing and particulate media. This effectively solves the technical problems of poor valve core sealing and wear resistance, easy leakage and failure, and short service life of traditional pneumatic ball valves.

[0039] In Example 2, the support member 123 can also use a disc spring or a wave spring instead of a compression spring. Disc springs have a large load-bearing capacity and strong energy absorption, making them suitable for working conditions with particularly severe hydraulic shocks. The number of first mounting grooves 1211 can also be set to two, six, or eight depending on the size of the valve core 12 and the sealing requirements, and they are evenly arranged along the circumference of the main body 121. The deformation member 122 can also be made of nitrile rubber or polyurethane elastomer to adapt to different medium temperatures and types. The first wear-resistant part 1213 and the second wear-resistant part 1214 can also be made of tungsten carbide hard alloy, or formed by laser cladding of a tungsten carbide composite powder layer on the surface of a stainless steel substrate. The remaining structure and working principle are the same as in Example 1, and will not be repeated here.

[0040] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A hydraulically sealed wear-resistant pneumatic ball valve, characterized in that, include: The valve body assembly (1) includes a valve seat (11), a valve core (12), a valve stem (13), and a pneumatic actuator (14). The valve core (12) is rotatably disposed inside the valve seat (11). The valve core (12) is fixed to one end of the valve stem (13). The other end of the valve stem (13) passes through the valve seat (11) and is fixedly connected to the pneumatic actuator (14). The valve stem (13) is rotatably connected to the valve seat (11). The lower side of the pneumatic actuator (14) is detachably connected to the valve core (12). The valve core (12) includes a main body (121), a deformable element (122), and a support element (123). The deformable element (122) is fixedly connected to the main body (121), one end of the support element (123) along the axial direction is fixed to the main body (121), and the other end of the support element (123) along the axial direction is fixedly connected to the deformable element (122).

2. The hydraulically sealed wear-resistant pneumatic ball valve according to claim 1, characterized in that, The main body (121) has multiple first mounting grooves (1211) on both sides along the axial direction of the flow channel. The first mounting grooves (1211) correspond one-to-one with the support members (123). The support members (123) are disposed in the first mounting grooves (1211), and the length of the support members (123) along the axial direction is greater than the length of the first mounting grooves (1211) along the axial direction.

3. The hydraulically sealed wear-resistant pneumatic ball valve according to claim 2, characterized in that, The main body (121) further includes a second mounting groove (1212), which is disposed on the outer surface of the main body (121) and in a radially outward direction. The projection of the second mounting groove (1212) coincides with the projection of the first mounting groove (1211).

4. The hydraulically sealed wear-resistant pneumatic ball valve according to claim 1, characterized in that, The main body (121) further includes a first wear-resistant part (1213), which is disposed in the middle of the outer ring surface of the main body (121) and abuts against the valve seat (11); The first wear-resistant part (1213) has rounded corners on both sides of its radial edge.

5. The hydraulically sealed wear-resistant pneumatic ball valve according to claim 4, characterized in that, The main body (121) also includes two second wear-resistant parts (1214). The two second wear-resistant parts (1214) are symmetrically arranged on both sides of the first wear-resistant part (1213) along the flow channel and are fixedly connected to the first wear-resistant part (1213). Each second wear-resistant part (1214) has rounded corners at the edges on both sides along the radial direction.

6. The hydraulically sealed wear-resistant pneumatic ball valve according to claim 5, characterized in that, The outer edge of the first wear-resistant part (1213) and the outer edge of the second wear-resistant part (1214) are both located in the same annular surface as the outer edge of the deformable part (122).

7. The hydraulically sealed wear-resistant pneumatic ball valve according to claim 4, characterized in that, The deformable part (122) is convex in the direction away from the first wear-resistant part (1213). One end of the support (123) along the axial direction is fixedly connected to the convex part of the deformable part (122) and is spaced apart from the side of the deformable part (122) away from the first wear-resistant part (1213).

8. The hydraulically sealed wear-resistant pneumatic ball valve according to claim 5, characterized in that, The deformable part (122) is made of flexible material, and the hardness of the second wear-resistant part (1214) and the first wear-resistant part (1213) is greater than that of the main body (121).

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