Cast steel fixed ball valve

Abstract

The utility model discloses a cast steel fixed ball valve, and relates to the technical field of valves. The valve comprises a valve body, and further comprises a valve part which is arranged on the valve body and used for controlling the valve body to be communicated and closed; the two adjustable sealing parts are mounted on the valve body and the valve part and are used for ensuring that the sealing performance of the valve part is complete; the sensitive adjusting part is arranged at the bottom of the valve body and is used for adjusting the sensitivity of the valve part; wherein the two adjustable sealing parts are arranged in the valve body in a mirror image mode, and the sensitivity adjusting part is used for adjusting the sensitivity of the valve part. By arranging the adjustable sealing part, the problems that when an existing steel fixed ball valve is used, loss caused by friction of a sealing piece ball body is inconvenient to supplement, it is difficult to guarantee that the sealing piece is continuously attached to the ball body, the sealing effect is affected, medium leakage is caused, accidents are caused, the service life of the ball valve is shortened, and the service life of the ball valve is shortened are solved. And the maintenance cost is increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, in particular to a cast steel fixed ball valve. Background Art

[0002] In the modern industrial system, the energy industry occupies a fundamental and critical position, and its development level directly affects the rise and fall of various industries. Oil and natural gas, as important traditional energy sources, still occupy a dominant position in the energy supply structure. From oil and gas extraction, transportation to storage, every link is inseparable from a huge and complex pipeline transportation network. The chemical industry is also booming, and the fields of fine chemicals and petrochemicals are constantly expanding. The production of various chemical products is increasingly dependent on the pipeline system. In these industrial scenarios, cast steel fixed ball valves are the core components for controlling the flow of media, and their performance is directly related to the stability and safety of the entire production system.

[0003] However, when using existing steel fixed ball valves, it is not convenient to replenish the loss caused by friction of the sealing ball, and it is difficult to ensure that the seal continues to be close to the ball. This will not only affect the sealing effect, cause medium leakage and accidents, but also reduce the service life of the ball valve and increase maintenance costs. Utility Model Content

[0004] The purpose of the utility model is to provide a cast steel fixed ball valve. By providing an adjustable sealing part, the problem that the existing steel fixed ball valve is inconvenient to replenish the loss caused by the friction of the sealing ball during use, and it is difficult to ensure that the sealing part continues to be close to the ball, which not only affects the sealing effect and causes medium leakage and accidents, but also reduces the service life of the ball valve and increases maintenance costs.

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] The utility model is a cast steel fixed ball valve, comprising a valve body and:

[0007] A valve part, which is arranged on the valve body and is used to control the connection and closure of the valve body; two adjustable sealing parts, which are installed on the valve body and the valve part and are used to ensure the integrity of the sealing of the valve part; and a sensitive adjustment part, which is arranged at the bottom of the valve body and is used to adjust the sensitivity of the valve part; wherein the two adjustable sealing parts are arranged in a mirror image in the valve body, and the sensitive adjustment part is used to adjust the sensitivity of the valve part.

[0008] Furthermore, the valve part includes a spherical gasket fixedly connected to the inner wall of the valve body, the inner wall of the spherical gasket is rotatably connected to a sphere, and a connecting piece is provided on the sphere; wherein, the spherical gasket and the sphere are provided with mutually connected through grooves for connecting the left and right sides of the valve part.

[0009] Furthermore, the adjustable sealing part includes an elastic compensation component, which is arranged in the valve part and fits tightly with the valve part; and an elastic adjustment component, which is installed on the elastic compensation component and is used to adjust the elasticity of the elastic compensation component; wherein, the elastic compensation component loses part of its elasticity to compensate for wear during use, and the elastic adjustment component supplements the lost elasticity of the elastic compensation component.

[0010] Furthermore, the sensitive adjustment part includes a limit assembly, which is installed on the outer wall of the valve body and the top of the limit assembly extends into the valve body; and two sensitive adjustment assemblies, which are installed on the limit assembly and are threadedly connected to the limit assembly; wherein the sensitivity of the valve part is adjusted by adjusting the threaded connection depth between the limit assembly and the sensitive adjustment assembly.

[0011] Furthermore, the elastic compensation component includes an annular groove formed on the valve body, a protrusion is slidably connected to the right inner wall of the annular groove, a slip ring is slidably connected to the inner wall of the annular groove, the outer wall of the slip ring contacts the protrusion, a plurality of spring telescopic rods are fixedly connected to the left side of the protrusion, and a seal is fixedly connected to the right side of the plurality of spring telescopic rods; wherein, when the protrusion slides downward, it squeezes the slip ring to move left in the annular groove, and the plurality of spring telescopic rods rebound after the seal is damaged, so that the seal and the valve part always remain sealed.

[0012] Furthermore, the elastic adjustment component includes a threaded rod fixedly connected to the top of the protrusion, the top of the threaded rod extends outside the valve body, the threaded rod is rotatably connected to the valve body, the outer wall of the threaded rod is threadedly connected to a nut, the bottom of the nut is fixedly connected to the valve body, and the top of the threaded rod is fixedly connected to knob 1; wherein, by rotating the threaded rod by knob 1, the threaded rod moves up and down on the nut, driving the protrusion to move to the left, so that several spring telescopic rods are compressed, thereby supplementing the elasticity of several spring telescopic rods.

[0013] Furthermore, the limit assembly includes a lower valve stem fixedly connected to the outer wall of the sphere, the bottom of the lower valve stem extends outside the valve body, the lower valve stem is rotatably connected to the valve body, the lower valve stem is rotatably connected to the spherical gasket, the bottom of the valve body is fixedly connected to a cylindrical shell, the bottom of the lower valve stem passes through the cylindrical shell, the lower valve stem is rotatably connected to the cylindrical shell, and the top inner wall of the cylindrical shell is fixedly connected to a plurality of limit blocks, and the sides of the plurality of limit blocks that are close to each other are in contact with the lower valve stem, and the inner wall of the cylindrical shell is provided with a thread; wherein, the plurality of limit blocks are made of elastic material, which will deform when subjected to force, and the side close to the lower valve stem is made of rubber material for generating sufficient friction, and the thread is used to connect the limit assembly and the sensitive adjustment assembly.

[0014] Furthermore, the sensitive adjustment component includes a cylindrical shell two arranged on the inner wall of the cylindrical shell one, the inner wall of the cylindrical shell two is provided with a thread two, and the bottom of the cylindrical shell two is fixedly connected with a knob two; wherein, the cylindrical shell two is threadedly connected to the cylindrical shell one through the thread two and the thread one, and the knob two is used to conveniently rotate the cylindrical shell two and adjust the threaded connection depth of the cylindrical shell two and the cylindrical shell one, and the top of the cylindrical shell two is provided with an inclined ring groove, and the inner wall of the inclined ring groove contacts the convex surface of the four limit blocks.

[0015] Furthermore, the connecting member includes an upper valve stem fixedly connected to the outer wall of the sphere, the top of the upper valve stem extends into the valve body, the upper valve stem is rotatably connected to the valve body, the upper valve stem is rotatably connected to the spherical gasket, and the outer wall of the valve body is fixedly connected to two connecting flanges; wherein, the upper valve stem is used to drive the ball to rotate on the spherical gasket, when the through grooves of the ball and the spherical gasket are connected, the valve part is opened, and when the through grooves of the ball and the spherical gasket are staggered, the valve part is closed, the upper valve stem is used to connect the ball and the valve body, and the connecting flange is used to connect the valve body and the pipeline.

[0016] Furthermore, the sealing member includes a mounting ring fixedly connected to the left side of several spring telescopic rods, the mounting ring is provided with a mounting groove, and the inner wall of the mounting groove is fixedly connected to a sealing ring; wherein, the sealing ring is in close contact with the sphere, and the mounting ring transmits the elastic force of the several spring telescopic rods to the sealing ring, so that it remains in close contact with the sphere.

[0017] The utility model has the following beneficial effects:

[0018] 1. By setting an adjustable sealing part, when it is necessary to supplement the elasticity of the right spring telescopic rod, the threaded rod is rotated by turning the knob. Since the threaded rod is threadedly connected to the nut fixedly connected to the valve body, the threaded rod will drop during rotation, thereby driving the protrusion to slide up and down on the right inner wall of the annular groove, thereby squeezing the slip ring to slide left, and the slip ring squeezes the four spring telescopic rods to contract, thereby supplementing the elastic force of the spring telescopic rods. Supplementing the elasticity of the spring telescopic rod on the right is similar to the above process, so that the friction loss of the seal can be compensated in time, ensuring that the seal is continuously close to the ball, thereby maintaining a good seal, preventing medium leakage, ensuring the safe operation of the pipeline system, and at the same time extending the service life of the ball valve and reducing maintenance costs;

[0019] 2. By setting a sensitivity adjustment part, when adjusting the sensitivity, turn knob 2, and knob 2 drives cylindrical shell 2 to rotate, so that cylindrical shell 1 moves upward under the action of thread 2 and thread 1, so that the inclined annular groove on the top of cylindrical shell 2 will squeeze several limit blocks, making them move closer to the lower valve stem, thereby increasing the friction between them and the lower valve stem, thereby reducing the sensitivity of the device; conversely, reverse knob 2, the friction between several limit blocks and the lower valve stem will decrease, thereby increasing the sensitivity of the device, so that the sensitivity of the valve can be adjusted according to actual conditions, avoiding excessive valve movement caused by improper operation or interference from external factors, thereby reducing damage to the pipeline system and equipment, and further ensuring the safe and stable operation of the entire pipeline system.

[0020] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 This is a schematic diagram of the front side cross-sectional structure of the present invention;

[0024] Figure 3 For this utility model Figure 2 Schematic diagram of the enlarged structure of A;

[0025] Figure 4 This is a partial cross-sectional structural diagram of the valve body of the utility model;

[0026] Figure 5 This is a partial cross-sectional structural diagram of the mounting ring of the utility model;

[0027] Figure 6 This is a partial cross-sectional structural diagram of the sensitive adjustment part of the utility model;

[0028] Figure 7 For this utility model Figure 6 Schematic diagram of the enlarged structure of B.

[0029] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0030] 1. Valve part; 111. Valve body; 112. Spherical gasket; 113. Ball; 114. Upper valve stem; 115. Connecting flange; 2. Adjustable sealing part; 21. Elastic compensation component; 211. Annular groove; 212. Bump; 213. Slip ring; 214. Spring telescopic rod; 215. Mounting ring; 216. Mounting groove; 217. Sealing ring; 22. Elastic adjustment component; 221. Threaded rod; 222. Nut; 223. Knob 1; 3. Sensitive adjustment part; 31. Limiting component; 311. Lower valve stem; 312. Cylindrical shell 1; 313. Limiting block; 314. Thread 1; 32. Sensitive adjustment component; 321. Cylindrical shell 2; 322. Thread 2; 323. Knob 2. DETAILED DESCRIPTION

[0031] 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 embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] See also Figure 1-7 As shown, the utility model is a cast steel fixed ball valve, including a valve body 111, and also includes: a valve part 1, the valve part 1 is arranged on the valve body 111, and is used to control the connection and closure of the valve body 111; two adjustable sealing parts 2, the adjustable sealing parts 2 are installed on the valve body 111 and the valve part 1, and are used to ensure the sealing of the valve part 1 is intact; and a sensitive adjustment part 3, the sensitive adjustment part 3 is arranged at the bottom of the valve body 111, and is used to adjust the sensitivity of the valve part 1; wherein, the two adjustable sealing parts 2 are arranged in a mirror image in the valve body 111, and the sensitive adjustment part 3 is used to adjust the sensitivity of the valve part 1, and the connecting piece includes a fixed connection to the outer wall of the ball 113 The upper valve stem 114, the top of the upper valve stem 114 extends into the valve body 111, the upper valve stem 114 is rotatably connected to the valve body 111, the upper valve stem 114 is rotatably connected to the spherical gasket 112, and the outer wall of the valve body 111 is fixedly connected to two connecting flanges 115; wherein, the upper valve stem 114 is used to drive the ball 113 to rotate on the spherical gasket 112, when the through grooves of the ball 113 and the spherical gasket 112 are connected, the valve part 1 is opened, and when the through grooves of the ball 113 and the spherical gasket 112 are staggered, the valve part 1 is closed, the upper valve stem 114 is used to connect the ball 113 and the valve body 111, and the connecting flange 115 is used to connect the valve body 111 and the pipeline.

[0033] The adjustable sealing portion 2 includes an elastic compensation component 21, which is arranged in the valve portion 1 and fits tightly with the valve portion 1; and an elastic adjustment component 22, which is installed on the elastic compensation component 21 and is used to adjust the elasticity of the elastic compensation component 21; wherein, the elastic compensation component 21 loses some elasticity to compensate for the wear during use, and the elastic adjustment component 22 supplements the elasticity lost by the elastic compensation component 21, and the elastic compensation component 21 includes an annular groove 211 provided on the valve body 111, and a protrusion 212 is slidably connected to the right inner wall of the annular groove 211 The inner wall of the annular groove 211 is slidably connected with a slip ring 213, and the outer wall of the slip ring 213 contacts the protrusion 212. The left side of the protrusion 212 is fixedly connected with a plurality of spring telescopic rods 214, and the right side of the plurality of spring telescopic rods 214 is fixedly connected with a seal. When the protrusion 212 slides downward, it squeezes the slip ring 213 to move left in the annular groove 211. The plurality of spring telescopic rods 214 rebound after the seal is damaged, so that the seal and the valve part 1 always maintain a seal. The seal includes a mounting ring 215 fixedly connected to the left side of the plurality of spring telescopic rods 214, and a mounting ring 215 is provided. There is a mounting groove 216, and a sealing ring 217 is fixedly connected to the inner wall of the mounting groove 216; wherein, the sealing ring 217 is in close contact with the ball 113, and the mounting ring 215 transmits the elastic force of the plurality of spring telescopic rods 214 to the sealing ring 217, so that it maintains a close contact state with the ball 113. The elastic adjustment component 22 includes a threaded rod 221 fixedly connected to the top of the protrusion 212, the top of the threaded rod 221 extends to the outside of the valve body 111, the threaded rod 221 is rotatably connected to the valve body 111, and the outer wall of the threaded rod 221 is threadedly connected to a nut 222, and the bottom of the nut 222 is fixedly connected to the valve body 111. A knob 223 is fixedly connected to the top of the threaded rod 221; the threaded rod 221 is rotated by rotating the knob 223, so that the threaded rod 221 moves up and down on the nut 222, driving the protrusion 212 to move left, so that the multiple spring telescopic rods 214 are compressed, thereby supplementing the elasticity of the multiple spring telescopic rods 214. By providing an adjustable sealing part 2, the friction loss of the seal can be compensated in time, ensuring that the seal is continuously in close contact with the ball 113, thereby maintaining a good seal, preventing medium leakage, ensuring the safe operation of the pipeline system, and at the same time extending the service life of the ball valve and reducing maintenance costs.

[0034] The sensitive adjustment part 3 includes a limit assembly 31, which is mounted on the outer wall of the valve body 111, and the top of the limit assembly 31 extends into the valve body 111; and two sensitive adjustment assemblies 32, which are mounted on the limit assembly 31 and are threadedly connected to the limit assembly 31; wherein the sensitivity of the valve part 1 is adjusted by adjusting the threaded connection depth between the limit assembly 31 and the sensitive adjustment assembly 32, and the limit assembly 31 includes a lower valve stem 311 fixedly connected to the outer wall of the sphere 113, and the bottom of the lower valve stem 311 extends to the inner wall of the sphere 113. Extending out of the valve body 111, the lower valve stem 311 is rotatably connected to the valve body 111, the lower valve stem 311 is rotatably connected to the spherical gasket 112, the bottom of the valve body 111 is fixedly connected to the cylindrical shell 1 312, the bottom of the lower valve stem 311 passes through the cylindrical shell 1 312, the lower valve stem 311 is rotatably connected to the cylindrical shell 1 312, the top inner wall of the cylindrical shell 1 312 is fixedly connected to a plurality of limit blocks 313, the sides of the plurality of limit blocks 313 that are close to each other are in contact with the lower valve stem 311, and the inner wall of the cylindrical shell 1 312 is provided with a thread 1 314; wherein, a plurality of The limit block 313 is made of elastic material and deforms when subjected to force. The side close to the lower valve stem 311 is made of rubber material to generate sufficient friction. The thread 1 314 is used to connect the limit assembly 31 and the sensitive adjustment assembly 32. The sensitive adjustment assembly 32 includes a cylindrical shell 2 321 arranged on the inner wall of the cylindrical shell 1 312. The inner wall of the cylindrical shell 2 321 is provided with a thread 2 322. The bottom of the cylindrical shell 2 321 is fixedly connected with a knob 2 323. Among them, the cylindrical shell 2 321 is connected to the cylindrical shell 1 through the thread 2 322 and the thread 1 314. 312 is a threaded connection, and knob 2 323 is used to conveniently rotate cylindrical shell 2 321 to adjust the threaded connection depth between cylindrical shell 2 321 and cylindrical shell 1 312. An inclined ring groove is provided on the top of cylindrical shell 2 321, and the inner wall of the inclined ring groove contacts the convex surface of the four limit blocks 313. By providing a sensitive adjustment part 3, the sensitivity of the valve can be adjusted according to actual conditions to avoid excessive valve movement caused by improper operation or interference from external factors, thereby reducing damage to the pipeline system and equipment, and further ensuring the safe and stable operation of the entire pipeline system.

[0035] A specific application of this embodiment is: when in use, the upper valve stem 114 drives the ball 113 to rotate, and the opening and closing of the valve part 1 are controlled by controlling the communication and dislocation of the ball 113 and the through groove on the spherical gasket 112. The sealing ring 217 rubs against the ball 113 when it rotates. After wear, the spring telescopic rod 214 will rebound and drive the mounting ring 215 close to the ball 113, thereby driving the sealing ring 217 to continue to fit with the ball 113, thereby ensuring the sealing between the ball 113 and the valve body 111. It is necessary to supplement the right spring telescopic rod When the elasticity of 214 is increased, the threaded rod 221 is rotated by turning the knob 223. Since the threaded rod 221 is threadedly connected to the nut 222 fixedly connected to the valve body 111, the threaded rod 221 will drop during rotation, thereby driving the protrusion 212 to slide up and down on the right inner wall of the annular groove 211, thereby squeezing the slip ring 213 to slide left, and the slip ring 213 squeezes the four spring telescopic rods 214 to shrink, thereby supplementing the elastic force of the spring telescopic rods 214. Supplementing the elasticity of the spring telescopic rod 214 on the right is similar to the above process.

[0036] When adjusting the sensitivity, turn knob 2 323, which drives cylindrical shell 2 321 to rotate, causing cylindrical shell 1 312 to move upward under the action of thread 2 322 and thread 1 314, so that the inclined annular groove on the top of cylindrical shell 2 321 will squeeze several limit blocks 313, causing them to move closer to the lower valve stem 311, thereby increasing the friction between them and the lower valve stem 311, thereby reducing the sensitivity of the device. Conversely, reverse knob 2 323, the friction between several limit blocks 313 and the lower valve stem 311 will decrease, thereby increasing the sensitivity of the device.

[0037] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0038] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments do not describe all details in detail, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A cast steel trunnion ball valve, comprising a valve body, characterized in that: Also includes: A valve portion, which is provided on the valve body and is used to control the connection and closing of the valve body; Two adjustable sealing parts, which are installed on the valve body and the valve part to ensure the sealing of the valve part; as well as A sensitivity adjustment portion, which is arranged at the bottom of the valve body and is used to adjust the sensitivity of the valve portion; Among them, the two adjustable sealing parts are arranged in a mirror image in the valve body, and the sensitive adjustment part is used to adjust the sensitivity of the valve part.

2. A cast steel trunnion mounted ball valve according to claim 1, characterized in that: The valve portion includes a spherical gasket fixedly connected to the inner wall of the valve body, the inner wall of the spherical gasket is rotatably connected to a ball, and the ball is provided with a connecting piece; The spherical gasket and the sphere are provided with mutually communicating grooves for communicating the left side and the right side of the valve part.

3. A cast steel trunnion mounted ball valve according to claim 2, characterized in that: The adjustable sealing portion includes an elastic compensation component, which is arranged in the valve portion and fits tightly with the valve portion; and an elasticity adjustment component, the elasticity adjustment component being mounted on the elasticity compensation component and being used to adjust the elasticity of the elasticity compensation component; The elastic compensation component loses part of its elasticity to compensate for wear during use, and the elastic adjustment component supplements the elasticity lost by the elastic compensation component.

4. A cast steel trunnion mounted ball valve according to claim 3, characterized in that: The sensitive adjustment part includes a limit assembly, the limit assembly is installed on the outer wall of the valve body, and the top of the limit assembly extends into the valve body; and Two sensitive adjustment components, wherein the sensitive adjustment components are mounted on the limit component and are threadedly connected to the limit component; The sensitivity of the valve part is adjusted by adjusting the threaded connection depth between the limit component and the sensitive adjustment component.

5. A cast steel trunnion mounted ball valve according to claim 4, characterized in that: The elastic compensation assembly includes an annular groove formed on the valve body, a protrusion is slidably connected to the right inner wall of the annular groove, a slip ring is slidably connected to the inner wall of the annular groove, the outer wall of the slip ring contacts the protrusion, a plurality of spring telescopic rods are fixedly connected to the left side of the protrusion, and a sealing member is fixedly connected to the right side of the plurality of spring telescopic rods; When the convex block slides downward, it squeezes the slip ring and makes it move leftward in the annular groove. After the seal is damaged, several spring telescopic rods rebound, so that the seal and the valve part always maintain a seal.

6. A cast steel trunnion mounted ball valve according to claim 5, characterized in that: The elastic adjustment assembly includes a threaded rod fixedly connected to the top of the protrusion, the top of the threaded rod extends outside the valve body, the threaded rod is rotatably connected to the valve body, the outer wall of the threaded rod is threadedly connected to a nut, the bottom of the nut is fixedly connected to the valve body, and the top of the threaded rod is fixedly connected to a knob 1; The threaded rod is rotated by turning the knob to move the threaded rod up and down on the nut, driving the protrusion to move leftward, so that the multiple spring telescopic rods are compressed, thereby supplementing the elasticity of the multiple spring telescopic rods.

7. The cast steel trunnion mounted ball valve according to claim 6, characterized in that: The limit assembly includes a lower valve stem fixedly connected to the outer wall of the sphere, the bottom of the lower valve stem extends outside the valve body, the lower valve stem is rotatably connected to the valve body, the lower valve stem is rotatably connected to the spherical gasket, the bottom of the valve body is fixedly connected to a cylindrical shell 1, the bottom of the lower valve stem passes through the cylindrical shell 1, the lower valve stem is rotatably connected to the cylindrical shell 1, a plurality of limit blocks are fixedly connected to the top inner wall of the cylindrical shell 1, the sides of the plurality of limit blocks that are close to each other are in contact with the lower valve stem, and a thread 1 is provided on the inner wall of the cylindrical shell 1; Among them, several limit blocks are made of elastic material and will deform when subjected to force. The side close to the lower valve stem is made of rubber material to generate sufficient friction. Thread 1 is used to connect the limit component and the sensitive adjustment component.

8. The cast steel trunnion mounted ball valve according to claim 7, characterized in that: The sensitive adjustment component includes a cylindrical shell 2 arranged on the inner wall of the cylindrical shell 1, the inner wall of the cylindrical shell 2 is provided with a second thread, and the bottom of the cylindrical shell 2 is fixedly connected with a second knob; Among them, cylindrical shell two is threadedly connected to cylindrical shell one through thread two and thread one, and knob two is used to conveniently rotate cylindrical shell two and adjust the threaded connection depth between cylindrical shell two and cylindrical shell one. An inclined annular groove is provided on the top of cylindrical shell two, and the inner wall of the inclined annular groove contacts the convex surfaces of the four limit blocks.

9. The cast steel trunnion mounted ball valve according to claim 8, characterized in that: The connecting member includes an upper valve stem fixedly connected to the outer wall of the sphere, the top of the upper valve stem extends into the valve body, the upper valve stem is rotatably connected to the valve body, the upper valve stem is rotatably connected to the spherical gasket, and the outer wall of the valve body is fixedly connected to two connecting flanges; Among them, the upper valve stem is used to drive the ball to rotate on the spherical gasket. When the through grooves of the ball and the spherical gasket are connected, the valve part is opened. When the through grooves of the ball and the spherical gasket are staggered, the valve part is closed. The upper valve stem is used to connect the ball and the valve body, and the connecting flange is used to connect the valve body and the pipeline.

10. The cast steel trunnion mounted ball valve according to claim 9, characterized in that: The sealing member includes a mounting ring fixedly connected to the left side of the plurality of spring telescopic rods, the mounting ring is provided with a mounting groove, and the inner wall of the mounting groove is fixedly connected to a sealing ring; The sealing ring is in close contact with the sphere, and the mounting ring transmits the elastic force of the plurality of spring telescopic rods to the sealing ring, so that the sealing ring maintains a close contact with the sphere.

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