Ball valve with high pressure compensation seat

Abstract

The application discloses a ball valve with a high-pressure compensation valve seat and belongs to the technical field of ball valves, which comprises a valve body, a valve seat, a valve rod and a ball body, the valve seat is arranged in the valve body, the ball body is matched with the valve seat, and the valve rod extends into the valve body along the radial direction of the valve body and is connected to the ball body. The valve seat is annular as a whole, an inner arc surface matched with the ball body is formed on the left end face of the valve seat, a first sealing ring is connected to the bottom of a first sliding hole through a first spring, and the bottom of the first sliding hole is connected with a first hydraulic channel; a plurality of first blind holes are uniformly distributed on the first inner ring step surface, a pressing rod is arranged in the first blind hole in a sliding sealing mode, the pressing rod is connected to the bottom of the first blind hole through a second spring, the bottom of the first blind hole is connected with a second hydraulic channel, and a sealing transmission assembly for transmitting hydraulic pressure is arranged between the first hydraulic channel and the second hydraulic channel. The ball valve can compensate and adjust the sealing components in real time, so as to solve the sealing failure of the ball valve under high pressure and other problems.

Description

Technical Field

[0001] This invention belongs to the field of valve technology, and specifically relates to a ball valve with a high-pressure compensation valve seat. Background Technology

[0002] In industrial and civil infrastructure projects, pipelines are commonly used to transport media. Due to changes in pressure or temperature, these pipelines need to be regulated. Ball valves are used in these pipelines to regulate flow and ensure optimal operating conditions and environmental safety. A ball valve typically uses a ball with a circular passage as its opening and closing element; the ball rotates with the valve body to achieve the opening and closing action. In the use of some high-pressure ball valves, the valve seat is subjected to high pressure from the pipeline and is affected by the aging of the equipment. The valve seat may detach from the ball surface, affecting the sealing performance of the equipment. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a ball valve with a high-pressure compensation valve seat, which can compensate and adjust the sealing components in real time to solve the problem of sealing failure of ball valve under high pressure conditions.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] The present invention relates to a ball valve with a high-pressure compensation seat, comprising a valve body, a valve seat, a valve stem, and a ball. The valve seat is disposed within the valve body, the ball cooperates with the valve seat, and the valve stem extends radially into the valve body and connects to the ball. The valve seat is generally annular. The left end face of the valve seat has an inner arc surface that mates with the sphere. A first sliding hole is formed on the inner arc surface. A first sealing ring is slidably sealed within the first sliding hole. The first sealing ring is connected to the bottom of the first sliding hole via a first spring. A first hydraulic channel is connected to the bottom of the first sliding hole. A first outer ring step surface is formed on the outer side of the valve seat. A first inner ring step surface and a second inner ring step surface are formed on the inner side of the valve body. The first inner ring step surface corresponds to the first outer ring step surface, and the second inner ring step surface corresponds to the right end face of the valve seat. A plurality of first blind holes are evenly distributed on the first inner ring step surface. A pressure rod is slidably sealed within each first blind hole. The pressure rod is connected to the bottom of the first blind hole via a second spring. A second hydraulic channel is connected to the bottom of the first blind hole. A sealing transmission assembly for transmitting hydraulic force is provided between the first and second hydraulic channels.

[0006] Furthermore, the sealing transmission assembly includes a piston rod and a third spring. A plurality of second blind holes are evenly distributed on the second inner ring step surface. The second blind holes are connected to the second hydraulic channel. A third blind hole connected to the first hydraulic channel is provided on the right end face of the valve seat. The two ends of the piston rod are respectively slidably sealed with the second blind hole and the third blind hole. The piston rod is connected to the bottom of the third blind hole through the third spring.

[0007] Furthermore, the first blind hole and the second blind hole correspond one-to-one. The first blind hole is connected to the second blind hole through the second hydraulic channel. Each set of first blind holes and second blind holes is distributed on both sides of the valve body axis.

[0008] Furthermore, a threaded hole is provided on the inner side of the valve body, and an adjusting screw is connected in the threaded hole. The inner side of the threaded hole communicates with the first blind hole.

[0009] Furthermore, a second outer ring step surface is formed on the outer side of the valve seat, and a third inner ring step surface corresponding to the second outer ring step surface is formed on the inner side of the valve body. A compressed flexible graphite ring is provided between the second outer ring step surface and the third inner ring step surface. The second outer ring step surface is connected to the pressure plate by a fourth spring, and the surface of the pressure plate abuts against the compressed flexible graphite ring.

[0010] Furthermore, an expanded flexible graphite ring is fixedly installed on the outer side of the valve seat adjacent to the left end face of the valve seat. The expanded flexible graphite ring has several first sliding grooves evenly opened in the circumference, and several second sliding grooves are opened on the inner side of the valve body. Metal blocks are simultaneously slidably sealed in the first and second sliding grooves, and the metal blocks are arranged along the axial direction of the valve body.

[0011] Furthermore, a second sliding hole is provided on the inner arc surface, and a second sealing ring is slidably sealed inside the second sliding hole. The second sealing ring is connected to the bottom of the second sliding hole by a fifth spring.

[0012] Furthermore, the valve stem has several annular grooves on its outer side, and the valve stem is rotatably sealed to the valve body. A sealing ring is provided in the annular groove.

[0013] Furthermore, a triangular annular groove is formed on the surface of the ball facing the valve seat, and a triangular flexible graphite ring is fitted inside the triangular annular groove. A sliding support rod is fixed on the end face of the triangular flexible graphite ring. A straight through groove is formed on the ball, and the groove is perpendicular to the channel of the ball. The sliding support rod is slidably disposed in the through groove.

[0014] The beneficial effects of this invention are as follows:

[0015] This invention relates to a ball valve with a high-pressure compensation seat. As the pressure increases and the medium flows from left to right within the valve body, the valve seat experiences a rightward thrust. Simultaneously, the valve seat moves a small distance to the right, pushing the pressure rod to deliver hydraulic oil from the second hydraulic channel. This hydraulic oil acts on the sealing transmission assembly and, through the first hydraulic channel, transmits the thrust in the opposite direction to the first sealing ring. This causes the first sealing ring to adhere tightly to the inner wall of the ball, increasing the sealing force of the valve seat and thus providing real-time compensation. Of course, the axial movement distance of the first sealing ring is greater than the movement distance of the valve seat.

[0016] In this invention's ball valve, the structure of the valve seat and valve body is optimized, resulting in a tighter seal and better sealing effect as the pressure increases. After the pressure is released, the second spring acts on the valve seat through the pressure rod, causing the valve seat to return to its original position and engage with the ball, thus avoiding gap problems. The pre-tensioned second spring provides thrust to the valve seat while simultaneously compensating for displacement, thus resisting pressure.

[0017] Other advantages, objectives, and features of the invention will be set forth in the following description and will be apparent to those skilled in the art in some respects, or may be learned by practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0018] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration:

[0019] Figure 1 This is a cross-sectional view of the ball valve of the present invention;

[0020] Figure 2 for Figure 1 Enlarged view at point A;

[0021] Figure 3 for Figure 1 Enlarged view at point B;

[0022] Figure 4 This is a schematic diagram of the structure of a sphere;

[0023] Figure 5 This is a schematic diagram of the structure of a triangular flexible graphite ring;

[0024] Figure 6 This is a schematic diagram of the valve seat structure;

[0025] Figure 7 This is a schematic diagram of the valve body structure;

[0026] Figure 8 This is the front view of the valve body.

[0027] The following components are labeled in the attached diagram: Valve body 1, Valve seat 2, Valve stem 3, Ball 4, Inner arc surface 5, First sliding hole 6, First sealing ring 7, First spring 8, First hydraulic channel 9, First outer ring step surface 10, First inner ring step surface 11, Second inner ring step surface 12, First blind hole 13, Pressure rod 14, Second spring 15, Second hydraulic channel 16, Piston rod 17, Third spring 18, Second blind hole 19, Third blind hole 20, Threaded hole 21, Adjusting screw 22, Second outer ring step surface 23, Third inner ring step surface 24, Compression flexible graphite ring 25, Fourth spring 26, Pressure plate 27, Expansion flexible graphite ring 28, First sliding groove 29, Second sliding groove 30, Metal block 31, Second sliding hole 32, Second sealing ring 33, Fifth spring 34, Circular groove 35, Sealing ring 36, Triangular ring groove 37, Triangular flexible graphite ring 38, Sliding support rod 39, Through groove 40. Detailed Implementation

[0028] like Figures 1-7 As shown, the present invention relates to a ball valve with a high-pressure compensation valve seat 2, comprising a valve body 1, a valve seat 2, a valve stem 3, and a ball 4. The valve seat 2 is disposed inside the valve body 1, and the ball 4 cooperates with the valve seat 2. The valve stem 3 extends radially into the valve body 1 and connects to the ball 4. The valve body 1 includes a horizontal section and a vertical section perpendicular to the horizontal section. The vertical section mainly cooperates with the valve stem 3 for rotational sealing. The fluid in the valve body 1 flows from left to right through the valve body 1. The ball 4 is located at the junction of the vertical section and the horizontal section, and the valve seat 2 is located to the right of the ball 4 and the vertical section. When the pressure of the medium in the valve body 1 increases, the valve seat 2 can feel the thrust brought by the medium from left to right.

[0029] Specifically, the valve seat 2 is generally annular, and the left end face of the valve seat 2 forms an inner arc surface 5 that mates with the ball 4. The inner arc surface 5 has a curvature that is basically the same as the outer surface curvature of the ball 4 to achieve a sealing fit. A first sliding hole 6 is provided on the inner arc surface 5, and the first sliding hole 6 extends inward along the normal direction of the inner arc surface 5. A first sealing ring 7 is provided in the first sliding hole 6 for sliding sealing, and the center line of the first sealing ring 7 coincides with the axis of the horizontal section of the valve body 1.

[0030] The first sealing ring 7 is connected to the bottom of the first sliding hole 6 via a first spring 8. The first spring 8 provides an outward preload to the first sealing ring 7 and, through a fixed connection, limits the first sealing ring 7 to prevent it from slipping outward. The bottom of the first sliding hole 6 is connected to a first hydraulic channel 9; the first hydraulic channel 9 is connected to a third blind hole 20.

[0031] A first outer ring step surface 10 is formed on the outer side of valve seat 2 at a distance away from the left end face of valve seat 2. A first inner ring step surface 11 and a second inner ring step surface 12 are formed sequentially from left to right along the axial direction on the inner side of valve body 1. The first inner ring step surface 11 corresponds to the first outer ring step surface, and the second inner ring step surface 12 corresponds to the right end face of valve seat 2. A plurality of first blind holes 13 are evenly distributed on the first inner ring step surface 11. A pressure rod 14 is slidably sealed in the first blind hole 13. The pressure rod 14 is arranged axially along the horizontal section. The pressure rod 14 is connected to the bottom of the first blind hole 13 by a second spring 15. The left end of the pressure rod 14 is tightly attached to the first outer ring step surface 10 under the pre-support force of the second spring 15. A second hydraulic channel 16 is connected to the bottom of the first blind hole 13. A sealing transmission assembly for transmitting hydraulic force is provided between the first hydraulic channel 9 and the second hydraulic channel 16.

[0032] During use, when the pressure inside the valve body 1 increases, the valve seat 2 is pushed by the medium from left to right. As the valve seat 2 moves a small distance to the right, it can push the pressure rod 14 to push the hydraulic oil in the second hydraulic channel 16. The hydraulic oil acts on the sealing transmission component and transmits the thrust in the opposite direction to the first sealing ring 7 through the first hydraulic channel 9, so that the first sealing ring 7 is tightly attached to the inner wall of the ball 4, increasing the sealing force of the valve seat 2, so as to play a real-time compensation role.

[0033] In this embodiment, the sealing transmission assembly includes a piston rod 17 and a third spring 18. The piston rod 17 is arranged axially along the horizontal section of the valve body 1. A plurality of second blind holes 19 are evenly distributed on the second inner ring step surface 12, communicating with the second hydraulic channel 16. A third blind hole 20 communicating with the first hydraulic channel 9 is provided on the right end face of the valve seat 2. The second blind holes 19 and 20 are aligned. Both ends of the piston rod 17 are slidably sealed with the second blind holes 19 and 20, respectively. The piston rod 17 can be made of rubber. The piston rod 17 is long enough that when the valve seat 2 is in the leftmost position, the piston rod 17 will not dislodge from either the second blind hole 19 or the third blind hole 20. Both ends of the piston rod 17 can seal the second blind hole 19 and the third blind hole 20, thereby transmitting thrust to the hydraulic oil. The piston rod 17 is connected to the bottom of the third blind hole 20 via a third spring 18. The third spring 18 provides elastic pre-support force to the piston rod 17 and also has a certain limiting effect on the piston rod 17.

[0034] In this embodiment, as Figure 8As shown, the first blind hole 13 and the second blind hole 19 correspond one-to-one. The first blind hole 13 is connected to the second blind hole 19 through the second hydraulic channel 16. Each set of first blind holes 13 and second blind holes 19 is distributed on both sides of the axis of the valve body 1. In the device of the present invention, with the axis of the valve seat 2 as the center, the first blind hole 13 on the upper side of the valve body 1 is connected to the second blind hole 19 on the lower side, and the first blind hole 13 on the left side of the valve body 1 is connected to the second blind hole 19 on the right side. The specific arrangement of the second hydraulic channel 16 can be changed as needed. By adopting this form, when the ball 4 deflects under pressure, the upper pressure rod 14 is compressed, which corresponds to the lower first sealing ring 7 extending outward, thus achieving a better sealing effect.

[0035] In this embodiment, a threaded hole 21 is provided on the inner side of the valve body 1, and an adjusting screw 22 is connected inside the threaded hole 21. The inner side of the threaded hole 21 communicates with the first blind hole 13. By rotating the adjusting screw 22, the length of the adjusting screw 22 extending into the first blind hole 13 can be changed, thereby adjusting the pressure of the hydraulic oil in the first blind hole 13, so as to play the role of adjusting the pressure during use.

[0036] In this embodiment, a second outer ring step surface 23 is formed on the outer side of the valve seat 2, and a third inner ring step surface 24 corresponding to the second outer ring step surface 23 is formed on the inner side of the valve body 1. A compressible flexible graphite ring 25 is disposed between the second outer ring step surface 23 and the third inner ring step surface 24. The second outer ring step surface 23 is connected to a pressure plate 27 via a fourth spring 26, and the surface of the pressure plate 27 abuts against the compressible flexible graphite ring 25. When the valve seat 2 moves to the right relative to the valve body 1, the second outer ring step surface 23 can compress the compressible flexible graphite ring 25 through the fourth spring 26 and the pressure plate 27. The compressible flexible graphite ring 25 undergoes a certain radial deformation, which can achieve a better sealing effect on the gap between the valve seat 2 and the valve body 1. The greater the pressure, the stronger the sealing effect, which can prevent the leakage of the medium.

[0037] In this embodiment, an expandable flexible graphite ring 28 is fixedly installed on the outer side of the valve seat 2, adjacent to the left end face of the valve seat 2. The expandable flexible graphite ring 28 has several first sliding grooves 29 evenly distributed circumferentially, and the valve body 1 has several second sliding grooves 30 distributed on its inner side. Metal blocks 31 are simultaneously slidably sealed within the first and second sliding grooves 29 and 30, and are arranged axially along the valve body 1. By providing the metal blocks 31, when the temperature inside the valve body 1 rises, the metal blocks 31 expand under the influence of temperature, which can better seal the initial stage of the fit between the valve body 1 and the valve seat 2. The metal blocks 31 also support and position the expandable flexible graphite ring 28, preventing the valve seat 2 from rotating. Therefore, the positions of each blind hole can be well guaranteed, the fit error is small, and wear problems during long-term use are avoided, ensuring the service life of the device.

[0038] In this embodiment, a second sliding hole 32 is provided on the inner arc surface 5, and a second sealing ring 33 is slidably sealed inside the second sliding hole 32. The second sealing ring 33 is connected to the bottom of the second sliding hole 32 by a fifth spring 34. The second sealing ring 33 can achieve a certain sealing effect and can provide auxiliary sealing at the mating position between the inner arc surface 5 and the sphere 4.

[0039] In this embodiment, several annular grooves 35 are formed on the outer side of the valve stem 3, and the valve stem 3 and the valve body 1 are rotatably sealed together. A sealing ring 36 is provided in the annular groove 35. This can seal the connection between the valve stem 3 and the valve body 1.

[0040] In this embodiment, a triangular annular groove 37 is formed on the surface of the ball 4 facing the valve seat 2. A triangular flexible graphite ring 38 is fitted inside the triangular annular groove 37, and a sliding support rod 39 is fixed to the end face of the triangular flexible graphite ring 38. A straight through groove 40 is formed on the ball 4, and the groove is perpendicular to the channel of the ball 4. The sliding support rod 39 is slidably disposed in the through groove 40. When the pressure inside the valve body 1 increases, the medium on the left side of the ball 4 can apply pressure to the sliding support rod 39 through the through groove 40, so that the triangular flexible graphite ring 38 is simultaneously subjected to a rightward thrust, allowing the triangular flexible graphite ring 38 to better cooperate with the first sealing ring 7 and the second sealing ring 33, further enhancing the sealing effect.

[0041] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A ball valve with a high-pressure compensating seat, comprising a valve body, a valve seat, a valve stem, and a ball, wherein the valve seat is disposed within the valve body. The ball mates with the valve seat, and the valve stem extends radially into the valve body and connects to the ball, characterized in that: The valve seat is generally annular. The left end face of the valve seat has an inner arc surface that mates with the sphere. A first sliding hole is formed on the inner arc surface. A first sealing ring is slidably sealed within the first sliding hole. The first sealing ring is connected to the bottom of the first sliding hole via a first spring. A first hydraulic channel is connected to the bottom of the first sliding hole. A first outer ring step surface is formed on the outer side of the valve seat. A first inner ring step surface and a second inner ring step surface are formed on the inner side of the valve body. The first inner ring step surface corresponds to the first outer ring step surface, and the second inner ring step surface corresponds to the right end face of the valve seat. A plurality of first blind holes are evenly distributed on the first inner ring step surface. A pressure rod is slidably sealed within each first blind hole. The pressure rod is connected to the bottom of the first blind hole via a second spring. A second hydraulic channel is connected to the bottom of the first blind hole. A sealing transmission assembly for transmitting hydraulic force is provided between the first hydraulic channel and the second hydraulic channel. The sealing transmission assembly includes a piston rod and a third spring. A plurality of second blind holes are evenly distributed on the second inner ring step surface. The second blind holes communicate with the second hydraulic channel. A third blind hole communicating with the first hydraulic channel is provided on the right end face of the valve seat. The two ends of the piston rod are respectively slidably sealed with the second blind hole and the third blind hole. The piston rod is connected to the bottom of the third blind hole through the third spring. A second outer ring step surface is formed on the outer side of the valve seat. A third inner ring step surface corresponding to the second outer ring step surface is formed on the inner side of the valve body. A compressed flexible graphite ring is provided between the second outer ring step surface and the third inner ring step surface. The second outer ring step surface is connected to the pressure plate through the fourth spring. The surface of the pressure plate abuts against the compressed flexible graphite ring.

2. The ball valve with a high-pressure compensating valve seat according to claim 1, characterized in that: The first blind hole and the second blind hole correspond one-to-one. The first blind hole is connected to the second blind hole through the second hydraulic channel. Each set of first blind holes and second blind holes is distributed on both sides of the valve body axis.

3. The ball valve with a high-pressure compensating valve seat according to claim 2, characterized in that: The valve body has a threaded hole on its inner side, and an adjusting screw is connected in the threaded hole. The inner side of the threaded hole communicates with the first blind hole.

4. The ball valve with a high-pressure compensating seat according to claim 1, characterized in that: An expanded flexible graphite ring is fixedly installed on the outer side of the valve seat adjacent to the left end face of the valve seat. The expanded flexible graphite ring has several first sliding grooves evenly opened in the circumference. Several second sliding grooves are opened on the inner side of the valve body. Metal blocks are slidably sealed in the first and second sliding grooves. The metal blocks are arranged along the axial direction of the valve body.

5. The ball valve with a high-pressure compensating valve seat according to claim 1, characterized in that: A second sliding hole is provided on the inner arc surface, and a second sealing ring is slidably and sealingly disposed in the second sliding hole. The second sealing ring is connected to a fifth spring. The bottom of the second sliding hole.

6. The ball valve with a high-pressure compensating seat according to any one of claims 1-5, characterized in that: The valve stem has several annular grooves on its outer side, and the valve stem is rotatably sealed to the valve body. A sealing ring is provided in the annular groove.

7. The ball valve with a high-pressure compensating seat according to any one of claims 1-5, characterized in that: A triangular annular groove is formed on the surface of the ball facing the valve seat. A triangular flexible graphite ring is fitted inside the triangular annular groove. A sliding support rod is fixed on the end face of the triangular flexible graphite ring. A straight through groove is formed on the ball. The through groove is perpendicular to the channel of the ball. The sliding support rod is slidably disposed in the through groove.

Images