Multistage sealing ball valve

Abstract

The invention relates to the technical field of valves, in particular to a multistage sealing ball valve which comprises a valve body, a valve cover, a valve rod, a valve ball, a left sealing ring, a right sealing ring, a first sealing assembly and a second sealing assembly. A valve ball capable of blocking the liquid channel after rotation is arranged in the valve element mounting cavity, and the valve ball is provided with a valve element channel which is through left and right; the inner side of the lower end of the valve cover abuts against the upper side of the valve ball and is matched with the spherical surface of the valve ball. The ball valve is reasonable and compact in structure and convenient to use, the left sealing ring and the right sealing ring are arranged and serve as split type quick-wear parts, and the situation that the whole valve body is directly replaced after the sealing face is abraded due to long-time use of the valve ball and the valve body is avoided; by arranging the left sealing ring, the right sealing ring, the first sealing assembly and the second sealing assembly, three-level sealing is achieved, and the sealing device has the advantages of being stable, reliable and good in sealing effect.

Description

Technical Field

[0001] This invention relates to the field of valve technology and is a multi-stage sealing ball valve. Background Technology

[0002] With the rapid development of the petroleum, chemical, and gas industries, ball valves, as an important supporting equipment in the transportation of petroleum products, are mainly used for cutting off, regulating, and changing the flow direction of fluids. They have wide applications in industry, construction, and daily life. With technological advancements, the design and materials of ball valves are constantly improving to meet more stringent usage requirements and enhance efficiency. As industrialization progresses, ball valves, due to their simple structure, good sealing performance, low fluid resistance, and ease of operation, have been widely used in various fields such as petroleum, chemical, construction, and water treatment.

[0003] The ball valve industry is also developing rapidly, gradually reaching international advanced levels not only in terms of quantity but also in technology. This is thanks to my country's continuous investment and research and development in manufacturing, which has significantly improved the country's self-sufficiency and controllability of key basic components such as ball valves.

[0004] Currently, in ball valve technology, the sealing performance mainly relies on the sealing surface between the ball and the valve seat. When the ball rotates, the contact pressure between the sealing surface and the valve seat produces a sealing effect. Modern ball valves typically use materials such as hard alloys, ceramics, and PTFE to manufacture the sealing surface to improve sealing performance and service life. However, due to the thermal expansion and contraction of materials, frictional wear on the sealing surface caused by the rotation of the ball, and increased gaps, leakage is a common problem in ball valves. Summary of the Invention

[0005] This invention provides a multi-stage sealing ball valve that overcomes the shortcomings of the prior art and effectively solves the problem of reduced sealing effect after wear of the valve seat sealing surface in existing ball valves.

[0006] The technical solution of this invention is achieved through the following measures: A multi-stage sealing ball valve includes a valve body, a valve cover, a valve stem, a valve ball, a left sealing ring, a right sealing ring, a first sealing assembly, and a second sealing assembly. The valve body has a liquid channel that runs through both sides. A valve core mounting cavity that communicates with the liquid channel is located on the upper side of the valve body. A valve ball that can seal the liquid channel after rotation is located inside the valve core mounting cavity. The valve ball has a valve core channel that runs through both sides. A valve cover is detachably and fixedly mounted on the upper side of the valve body. The inner side of the lower end of the valve cover abuts against the upper side of the valve ball and matches the spherical surface of the valve ball. The valve cover has a valve stem mounting cavity that runs through both the upper and lower sides. The valve body has a valve stem fixedly mounted on its upper end within the valve stem mounting cavity, with its upper end positioned above the valve cover. The valve cover has an upper sealing ring groove on its inner side, containing a first sealing component. The valve cover also has a lower sealing ring groove on its inner side, containing a second sealing component. A left sealing ring is located between the left side of the valve ball and the valve body, corresponding to the lower position of the valve cover. The inner side of the right end of the left sealing ring has a left sealing hole that matches the spherical surface of the valve ball. Similarly, a right sealing ring is located between the right side of the valve ball and the valve body, corresponding to the lower position of the valve cover. The inner side of the left end of the right sealing ring has a right sealing hole that matches the spherical surface of the valve ball.

[0007] The following are further optimizations and / or improvements to the above-mentioned technical solution: The aforementioned first sealing assembly may include a packing gland, a locking nut, and a sealing packing. A sealing packing is provided on the outer side of the valve stem corresponding to the lower position of the sealing ring groove. A packing gland located on the outer side of the valve stem and with its upper end above the valve cover is fixedly installed on the inner side of the upper end of the valve cover. The lower end of the packing gland abuts against the sealing packing. A locking nut whose lower side abuts against the upper side of the valve cover is fixedly installed on the outer side of the upper part of the packing gland.

[0008] The aforementioned second sealing assembly may include a rubber gasket, a polytetrafluoroethylene (PTFE) gasket, and a first compensating spring. A number of sets of spaced rubber gaskets and PTFE gaskets are arranged sequentially from top to bottom on the outer side of the valve stem corresponding to the upper position of the lower sealing ring groove. A first compensating spring is provided on the outer side of the lower end of the valve stem, located in the lower sealing ring groove and with its upper end abutting against the PTFE gasket.

[0009] The above may also include a second compensating spring and a third compensating spring. A left annular mounting groove with an opening to the right is provided in the valve body corresponding to the left side of the left sealing ring. A second compensating spring with its right end abutting against the left side of the left sealing ring is provided in the left annular mounting groove. A right annular mounting groove with an opening to the left is provided in the valve body corresponding to the right side of the right sealing ring. A third compensating spring with its left end abutting against the right side of the right sealing ring is provided in the right annular mounting groove.

[0010] The above may also include a rotating guide rod, and an upward-opening guide blind hole is provided on the inner side of the bottom surface of the valve seat corresponding to the valve stem position, and a rotating guide rod located in the guide blind hole is fixedly installed on the lower side of the valve ball.

[0011] The above may also include a connecting flange, with a connecting flange provided on the outer side of the upper part of the valve cover corresponding to the position above the valve body, and the valve cover is fixedly installed together with the upper side of the valve seat through the connecting flange.

[0012] The above may also include a sealing gasket, with a sealing gasket provided between the upper side of the valve body and the lower side of the valve cover.

[0013] The above may also include a grease injection nozzle, and at least two grease injection holes are provided on the outer circumference of the valve stem at a distance corresponding to the position between the upper sealing ring groove and the lower sealing ring groove. A grease injection channel with an upward opening and communication with the grease injection holes is provided on the upper side of the valve stem, and a grease injection nozzle is fixedly installed at the upper end of the grease injection channel.

[0014] The present invention has a reasonable and compact structure and is easy to use. By setting a left sealing ring and a right sealing ring, which are separate vulnerable parts, the valve ball and valve body are avoided from being replaced directly after the sealing surface is worn due to long-term use. By setting a left sealing ring, a right sealing ring, a first sealing component and a second sealing component, a three-level seal is achieved, which has the characteristics of stability, reliability and good sealing effect. Attached Figure Description

[0015] Appendix Figure 1 These are schematic diagrams of the main cross-sectional structure of embodiments 1 to 8 of the present invention.

[0016] Appendix Figure 2 For the appendix Figure 1 A three-dimensional structural diagram of the valve body.

[0017] Appendix Figure 3 For the appendix Figure 1 A three-dimensional structural diagram of the middle valve cover.

[0018] Appendix Figure 4 For the appendix Figure 1 A three-dimensional structural diagram of the middle valve ball.

[0019] The codes in the attached diagram are as follows: 1 for valve body, 2 for valve cover, 3 for valve stem, 4 for valve ball, 5 for left sealing ring, 6 for right sealing ring, 7 for rotating guide rod, 8 for packing gland, 9 for lock nut, 10 for sealing packing, 11 for rubber gasket, 12 for PTFE gasket, 13 for second compensating spring, 14 for third compensating spring, 15 for left annular mounting groove, 16 for first compensating spring, 17 for connecting flange, 18 for sealing gasket, 19 for grease nipple, 20 for grease injection hole, 121 for grease injection channel, 22 for liquid channel, 23 for valve core mounting cavity, 24 for valve core channel, and 25 for valve stem mounting cavity. Detailed Implementation

[0020] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0021] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as front, back, top, bottom, left, right, etc. The positional relationships are determined based on the layout direction of the attached diagram in the instruction manual.

[0022] The present invention will be further described below with reference to embodiments and accompanying drawings: Example 1: As shown in the attached document Figure 1 , 2 As shown in Figures 3 and 4, the multi-stage sealing ball valve includes a valve body 1, a valve cover 2, a valve stem 3, a valve ball 4, a left sealing ring 5, a right sealing ring 6, a first sealing assembly, and a second sealing assembly. The valve body 1 has a liquid passage 22 that runs through both sides. The upper side of the valve body 1 has a valve core mounting cavity 23 that communicates with the liquid passage 22. The valve ball 4, which can seal the liquid passage 22 after rotation, is located in the valve core mounting cavity 23. The valve ball 4 has a valve core passage 24 that runs through both sides. The valve cover 2 is detachably and fixedly installed on the upper side of the valve body 1. The inner side of the lower end of the valve cover 2 abuts against the upper side of the valve ball 4 and matches the spherical surface of the valve ball 4. The valve cover 2 has a valve stem mounting cavity 25 that runs through both the upper and lower sides. A valve stem 3 is fixedly mounted on the upper end of the valve ball 4, located within the valve stem mounting cavity 25 and positioned above the valve cover 2. The upper inner side of the valve cover 2 has an upper sealing ring groove containing a first sealing component. The lower inner side of the valve cover 2 has a lower sealing ring groove containing a second sealing component. A left sealing ring 5 is located between the left side of the valve ball 4 and the valve body 1, corresponding to the lower position of the valve cover 2. The right inner side of the left sealing ring 5 has a left sealing hole that matches the spherical surface of the valve ball 4. A right sealing ring 6 is located between the right side of the valve ball 4 and the valve body 1, corresponding to the lower position of the valve cover 2. The left inner side of the right sealing ring 6 has a right sealing hole that matches the spherical surface of the valve ball 4. During use, by setting the left sealing ring 5 and the right sealing ring 6, they can be used as separate wear parts, avoiding the need to directly replace the entire valve body 1 after the sealing surface of the valve ball 4 and valve body 1 wears down over a long period of use. By setting the left sealing ring 5, the right sealing ring 6, the first sealing component, and the second sealing component, a three-stage sealing is achieved. The above-mentioned multi-stage sealing ball valve can be further optimized and / or improved according to actual needs: Example 2: As shown in the attached document Figure 1 , 2 As shown in Figures 3 and 4, the first sealing assembly includes a packing gland 8, a locking nut 9, and a sealing packing 10. The sealing packing 10 is located on the outer side of the valve stem 3 corresponding to the lower part of the sealing ring groove. A packing gland 8, located on the outer side of the valve stem 3 and with its upper end above the valve cover 2, is fixedly installed on the inner side of the upper end of the valve cover 2. The lower end of the packing gland cover abuts against the sealing packing 10. A locking nut 9, whose lower side abuts against the upper side of the valve cover 2, is fixedly installed on the outer side of the upper part of the packing gland 8. During use, the sealing packing 10 ensures a good seal between the valve stem 3 and the valve cover 2.

[0023] Example 3: As shown in the attached document Figure 1 , 2 As shown in Figures 3 and 4, the second sealing assembly includes a rubber gasket 11, a PTFE gasket 12, and a first compensating spring 16. Several sets of spaced rubber gaskets 11 and PTFE gaskets 12 are sequentially arranged from top to bottom on the outer side of the valve stem 3, corresponding to the upper part of the lower sealing ring groove. A first compensating spring 16 is located on the outer side of the lower end of the valve stem 3, within the lower sealing ring groove, and its upper end abuts against the PTFE gasket 12. During use, the first compensating spring 16 maintains the sealing effect between the valve stem 3 and the valve cover 2 by using the rubber gasket 11 and the PTFE gasket 12. Depending on the requirements, the rubber gasket 11 is made of rubber that does not chemically react with gases or liquids, possessing strong extensibility. Its concave design on both upper and lower surfaces extends inward and outward after being compressed by the PTFE gasket 12, thus achieving a better sealing effect.

[0024] Example 4: As shown in the appendix Figure 1 , 2 As shown in Figures 3 and 4, the valve body 1 also includes a second compensating spring 13 and a third compensating spring 14. A left annular mounting groove 15 with its opening facing right is provided inside the valve body 1 corresponding to the left side of the left sealing ring 5. The right end of the second compensating spring 13 abuts against the left side of the left sealing ring 5 within the left annular mounting groove 15. Similarly, a right annular mounting groove with its opening facing left is provided inside the valve body 1 corresponding to the right side of the right sealing ring 6. The left end of the third compensating spring 14 abuts against the right side of the right sealing ring 6 within the right annular mounting groove. During use, by providing the second compensating spring 13 and the third compensating spring 14, the valve body 1 can maintain contact and sealing between the left and right sealing rings 5 ​​and 6 and the valve ball 4 even after wear on their sealing surfaces.

[0025] Example 5: As shown in the attached document Figure 1 , 2 As shown in Figures 3 and 4, the valve also includes a rotating guide rod 7. A guide blind hole with an upward opening is provided on the inner side of the bottom surface of the valve seat corresponding to the position of the valve stem 3. The rotating guide rod 7, located within the guide blind hole, is fixedly installed on the lower side of the valve ball 4. During use, by positioning the valve stem 3, which is fixedly installed at the upper end of the valve ball 4, within the valve stem mounting cavity 25, and positioning the rotating guide rod 7, which is fixedly installed at the lower end of the valve ball 4, within the guide blind hole, the valve ball 4 is ensured to be centered during rotation, preventing it from shifting and thus affecting the connection between the liquid passage 22 and the valve core passage 24.

[0026] Example 6: As attached Figure 1 , 2 As shown in Figures 3 and 4, a connecting flange 17 is also included. The valve cover 2, located above the valve body 1, has a connecting flange 17 on its upper outer side. The valve cover 2 is fixedly installed to the upper side of the valve seat via the connecting flange 17. During use, the connecting flange 17 facilitates the detachable and fixed installation of the valve body 1 and the valve cover 2.

[0027] Example 7: As attached Figure 1 , 2 As shown in Figures 3 and 4, a sealing gasket 18 is also included, which is provided between the upper side of the valve body 1 and the lower side of the valve cover 2. During use, the sealing gasket 18 ensures the sealing between the valve body 1 and the valve cover 2.

[0028] Example 8: As attached Figure 1 , 2 As shown in Figures 3 and 4, the valve also includes a grease injection nozzle 19. At least two grease injection holes 20 are spaced apart on the outer circumference of the valve stem 3, corresponding to the position between the upper and lower sealing ring grooves. A grease injection channel 21, opening upwards and communicating with the grease injection holes 20, is provided on the upper side of the valve stem 3. A grease injection nozzle 19 is fixedly installed at the upper end of the grease injection channel 21. During use, sealing grease is injected into the grease injection channel 21 through the grease injection nozzle 19, reducing friction during valve stem 3 rotation and thus allowing the valve ball 4 to rotate freely.

[0029] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A multi-stage sealing ball valve, characterized in that... The valve body comprises a valve body, valve cover, valve stem, valve ball, left sealing ring, right sealing ring, first sealing assembly, and second sealing assembly. The valve body has a through-flow liquid channel. The upper side of the valve body has a valve core mounting cavity that communicates with the liquid channel. The valve core mounting cavity contains a valve ball that can seal the liquid channel after rotation. The valve ball has a through-flow valve core channel. A valve cover is detachably and fixedly mounted on the upper side of the valve body. The inner side of the lower end of the valve cover abuts against the upper side of the valve ball and matches the spherical surface of the valve ball. The valve cover has a through-flow valve stem mounting cavity. A valve stem mounting cavity is fixedly mounted on the upper end of the valve ball. The valve stem is installed inside the valve cavity and its upper end is located above the valve cover. The upper inner side of the valve cover is provided with an upper sealing ring groove, and a first sealing component is provided in the upper sealing ring groove. The lower inner side of the valve cover is provided with a lower sealing ring groove, and a second sealing component is provided in the lower sealing ring groove. A left sealing ring is provided between the left side of the valve ball and the valve body corresponding to the lower position of the valve cover. The right inner side of the left sealing ring is provided with a left sealing hole that matches the spherical surface of the valve ball. A right sealing ring is provided between the right side of the valve ball and the valve body corresponding to the lower position of the valve cover. The left inner side of the right sealing ring is provided with a right sealing hole that matches the spherical surface of the valve ball.

2. The multi-stage sealing ball valve according to claim 1, characterized in that... The first sealing assembly includes a packing gland, a locking nut, and a sealing packing. A sealing packing is provided on the outer side of the valve stem corresponding to the lower part of the sealing ring groove. A packing gland located on the outer side of the valve stem and with its upper end above the valve cover is fixedly installed on the inner side of the upper end of the valve cover. The lower end of the packing gland abuts against the sealing packing. A locking nut with its lower side abutting against the upper side of the valve cover is fixedly installed on the outer side of the upper part of the packing gland.

3. The multi-stage sealing ball valve according to claim 1 or 2, characterized in that... The second sealing assembly includes a rubber pad, a polytetrafluoroethylene (PTFE) pad, and a first compensating spring. A number of sets of rubber pads and PTFE pads are arranged at intervals from top to bottom on the outer side of the valve stem corresponding to the upper position of the lower sealing ring groove. The lower end of the valve stem is provided with a first compensating spring located in the lower sealing ring groove and whose upper end abuts against the PTFE pad.

4. The multi-stage sealing ball valve according to claim 1 or 2, characterized in that... It also includes a second compensating spring and a third compensating spring. The valve body corresponding to the left side of the left sealing ring is provided with a left annular mounting groove with an opening to the right. The right end of the second compensating spring abuts against the left side of the left sealing ring is provided in the left annular mounting groove. The valve body corresponding to the right side of the right sealing ring is provided with a right annular mounting groove with an opening to the left. The left end of the third compensating spring abuts against the right side of the right sealing ring is provided in the right annular mounting groove.

5. The multi-stage sealing ball valve according to claim 3, characterized in that... It also includes a second compensating spring and a third compensating spring. The valve body corresponding to the left side of the left sealing ring is provided with a left annular mounting groove with an opening to the right. The right end of the second compensating spring abuts against the left side of the left sealing ring is provided in the left annular mounting groove. The valve body corresponding to the right side of the right sealing ring is provided with a right annular mounting groove with an opening to the left. The left end of the third compensating spring abuts against the right side of the right sealing ring is provided in the right annular mounting groove.

6. The multi-stage sealing ball valve according to claim 1, 2, or 5, characterized in that... It also includes a rotating guide rod, and a guide blind hole with an upward opening is provided on the inner side of the bottom surface of the valve seat corresponding to the valve stem position. A rotating guide rod located in the guide blind hole is fixedly installed on the lower side of the valve ball.

7. The multi-stage sealing ball valve according to claim 3, characterized in that... It also includes a rotating guide rod, and a guide blind hole with an upward opening is provided on the inner side of the bottom surface of the valve seat corresponding to the valve stem position. A rotating guide rod located in the guide blind hole is fixedly installed on the lower side of the valve ball.

8. The multi-stage sealing ball valve according to claim 4, characterized in that... It also includes a rotating guide rod, and a guide blind hole with an upward opening is provided on the inner side of the bottom surface of the valve seat corresponding to the valve stem position. A rotating guide rod located in the guide blind hole is fixedly installed on the lower side of the valve ball.

9. The multi-stage sealing ball valve according to claim 1, 2, 5, 7, or 8, characterized in that... It also includes a connecting flange, with a connecting flange provided on the outer side of the upper part of the valve cover corresponding to the position above the valve body, and the valve cover is fixedly installed together with the upper side of the valve seat through the connecting flange; or / and includes a sealing gasket, with a sealing gasket provided between the upper side of the valve body and the lower side of the valve cover; or / and includes a grease injection nozzle, with at least two grease injection holes spaced apart on the outer circumference of the valve stem corresponding to the position between the upper sealing ring groove and the lower sealing ring groove, and a grease injection channel with an upward opening that can communicate with the grease injection holes provided on the upper side of the valve stem, with a grease injection nozzle fixedly installed at the upper end of the grease injection channel.

10. The multi-stage sealing ball valve according to claim 6, characterized in that... It also includes a connecting flange, with a connecting flange provided on the outer side of the upper part of the valve cover corresponding to the position above the valve body, and the valve cover is fixedly installed together with the upper side of the valve seat through the connecting flange; or / and includes a sealing gasket, with a sealing gasket provided between the upper side of the valve body and the lower side of the valve cover; or / and includes a grease injection nozzle, with at least two grease injection holes spaced apart on the outer circumference of the valve stem corresponding to the position between the upper sealing ring groove and the lower sealing ring groove, and a grease injection channel with an upward opening that can communicate with the grease injection holes provided on the upper side of the valve stem, with a grease injection nozzle fixedly installed at the upper end of the grease injection channel.

Images