A type c forced seal ball valve

Abstract

The application discloses a C type forced sealing ball valve, and relates to the technical field of valves.The C type forced sealing ball valve comprises a valve body, a valve cover, a support, an upper valve rod, a ball, a first fixed plate, a flow guide pipe, a lower valve rod, a valve seat, a spring support ring and a second fixed plate; the valve cover is covered on the top of the valve body; the support is fixed above the valve cover; the upper valve rod is axially arranged in the support and the valve cover; the ball is fixedly connected with the lower end of the upper valve rod; the valve seat is matched with the outer surface of the ball; the spring support ring is connected with the side of the valve seat, which is far away from the ball; the first fixed plate is sleeved on the spring support ring; the first fixed plate is located outside the valve seat; the first fixed plate is connected with the inner wall of the valve body; the lower valve rod is axially arranged at the bottom of the valve body and is fixedly connected with the lower end of the ball; and the second fixed plate is sleeved outside the flow guide pipe.The C type forced sealing ball valve is used to improve the sealing reliability, simplify the disassembly and assembly process, reduce the maintenance cost, and improve the stability of the opening and closing process and structure through internal sealing and external sealing.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a type C forced sealing ball valve. Background Technology

[0002] A ball valve is a type of valve in which the opening and closing element (the ball) is driven by the valve stem and rotates around the valve's axis. The most distinctive feature of a ball valve is that when fully open, the ball passage and the valve body flow channel form a pipe, making it the valve with the lowest flow resistance. However, due to its structural characteristics, during the opening or closing process, the medium in the pipe can enter the valve body from the cavity between the valve seat and the ball, where it may settle, become stuck in the ball core due to pressure, or scratch the ball surface or sealing surface.

[0003] Meanwhile, during the valve closing process, particulate impurities in the medium can easily become trapped between the valve seat and the ball, thus damaging the sealing performance. Due to the complex structure and high material cost of ball valves, replacement costs are high when the valve's sealing performance fails to meet requirements. Furthermore, the difficulty in repair leads to the scrapping of a large amount of manufacturing raw materials, resulting in a significant waste of metal resources. Summary of the Invention

[0004] The purpose of this invention is to provide a C-type forced sealing ball valve that improves sealing reliability, simplifies disassembly and assembly processes, reduces maintenance costs, and enhances the stability of the opening and closing process and structure through internal and external sealing.

[0005] This invention provides a C-type forced sealing ball valve, comprising a valve body, a valve cover, a bracket, an upper valve stem, a ball, a first fixing plate, a guide pipe, a lower valve stem, a valve seat, a spring support ring, and a second fixing plate. The valve cover is fitted onto the top of the valve body, the bracket is fixed above the valve cover, the upper valve stem passes axially through the bracket and the valve cover, the ball is fixedly connected to the lower end of the upper valve stem, the valve seat mates with the outer surface of the ball, the spring support ring is connected to the side of the valve seat away from the ball, the first fixing plate is sleeved on the spring support ring, the first fixing plate is located outside the valve seat, and the first fixing plate is connected to the inner wall of the valve body, the lower valve stem passes axially through the bottom of the valve body and is fixedly connected to the lower end of the ball, the second fixing plate is sleeved on the outside of the guide pipe, and the two ends of the guide pipe are respectively connected to the second fixing plate and the ball.

[0006] Preferably, the sphere has a C-shaped structure, forming a closed cavity inside the sphere; one end of the guide tube is fixedly connected to the second fixed plate, and the other end of the guide tube extends into the cavity inside the C-shaped sphere and seals with the sphere; the guide tube seals with the sphere, and the outer surface of the sphere seals with the valve seat.

[0007] Preferably, the first fixing plate has an annular structure, and the inner circumference of the first fixing plate abuts against the outer wall of the valve seat and the outer wall of the spring support ring, respectively. The second fixing plate has an annular structure, and the inner circumference of the second fixing plate is fixedly connected to the outer wall of the guide tube.

[0008] Preferably, a first self-lubricating bearing is provided between the mating hole of the upper valve stem and the valve cover, and a second self-lubricating bearing is provided between the mating hole of the lower valve stem and the bottom of the valve body; the inner wall of the first self-lubricating bearing is in sliding fit with the outer wall of the upper valve stem, and the inner wall of the second self-lubricating bearing is in sliding fit with the outer wall of the lower valve stem.

[0009] Preferably, the spring support ring includes an annular seat and compression springs evenly distributed along the circumference of the annular seat; one end of the compression spring abuts against the annular seat, and the other end abuts against the end face of the valve seat away from the ball.

[0010] Preferably, the valve cover is provided with a packing ring on the top and is sleeved on the outside of the upper valve stem, and the packing plate is sleeved on the outside of the upper valve stem and located above the packing ring, with the bottom of the packing plate abutting against the top of the packing ring 7.

[0011] Preferably, the top of the bracket is provided with a valve stem bushing plate, which is sleeved on the outside of the upper valve stem. The valve cover is fixedly connected to the fixed plate by bolts. The fixed plate is disc-shaped, and the center hole of the fixed plate is sleeved on the outside of the upper valve stem. A first thrust washer is provided between the fixed plate and the upper valve stem, and a second thrust washer is provided between the lower valve stem and the bottom of the valve body.

[0012] Preferably, the axis of the cavity inside the sphere is collinear with the axis of the guide tube, and the inner diameter of the cavity inside the sphere is equal to the inner diameter of the guide tube.

[0013] Preferably, the valve body, ball, and guide tube are all made of stainless steel, and the mating surface of the valve seat is made of polytetrafluoroethylene or para-polystyrene.

[0014] Preferably, the inner peripheral wall of the first fixing plate is provided with a guide slope, which faces the end of the valve seat and the end of the spring support ring respectively; the inner peripheral wall of the second fixing plate is provided with a guide slope, which faces the end of the guide tube.

[0015] Therefore, the present invention adopts the above-mentioned type C forced sealing ball valve, which improves sealing reliability, simplifies disassembly and assembly process, reduces maintenance costs, and enhances the stability of opening and closing process and structure through internal and external sealing.

[0016] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a C-type forced sealing ball valve according to the present invention;

[0018] Figure 2 This is a top view of a C-type forced sealing ball valve according to the present invention;

[0019] Figure 3This is a schematic diagram of the structure of a C-type forced sealing ball valve with the valve cover removed according to the present invention;

[0020] Figure 4 This is a schematic diagram of the structure of a C-type forced sealing ball valve with the support removed according to the present invention;

[0021] Figure 5 This is a schematic diagram of the fixed disc in a C-type forced sealing ball valve according to the present invention;

[0022] Figure 6 This is a top view of the ball in a C-type forced sealing ball valve according to the present invention;

[0023] Figure 7 This is a schematic diagram of the flow guide tube in a C-type forced sealing ball valve according to the present invention;

[0024] Figure 8 This is a schematic diagram of the lower valve stem in a C-type forced sealing ball valve according to the present invention;

[0025] Figure 9 This is a schematic diagram of the spring support ring in a C-type forced sealing ball valve according to the present invention.

[0026] Figure Labels

[0027] 1. Valve body; 2. Valve cover; 3. Bracket; 4. Upper valve stem; 5. Valve stem bushing plate; 6. Packing pressure plate; 7. Packing pressure ring; 8. First self-lubricating bearing; 9. First thrust washer; 10. Fixed plate; 11. Ball; 12. First fixed plate; 13. Guide tube; 14. Lower valve stem; 15. Valve seat; 16. Spring support ring; 17. Second self-lubricating bearing; 18. Second thrust washer; 19. Second fixed plate; 20. Annular seat; 21. Compression spring. Detailed Implementation

[0028] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0029] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0030] The terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0031] Example 1

[0032] like Figures 1-9 As shown, the present invention discloses a C-type forced sealing ball valve, comprising a valve body 1, a valve cover 2, a bracket 3, an upper valve stem 4, a ball 11, a first fixing plate 12, a guide pipe 13, a lower valve stem 14, a valve seat 15, a spring support ring 16, and a second fixing plate 19. The valve cover 2 covers the top of the valve body 1, the bracket 3 is fixed above the valve cover 2, the upper valve stem 4 passes axially through the bracket 3 and the valve cover 2, the ball 11 is fixedly connected to the lower end of the upper valve stem 4, and the valve seat 15 mates with the outer surface of the ball 11.

[0033] The spring support ring 16 is connected to the valve seat 15 on the side away from the ball 11. The first fixing plate 12 is sleeved on the spring support ring 16 and is located outside the valve seat 15. The first fixing plate 12 is connected to the inner wall of the valve body 1. The lower valve stem 14 passes through the bottom of the valve body 1 axially and is fixedly connected to the lower end of the ball 11. The second fixing plate 19 is sleeved on the outside of the guide tube 13, and the two ends of the guide tube 13 are respectively connected to the second fixing plate 19 and the ball 11.

[0034] The ball 11 has a C-shaped structure, forming a closed cavity inside. One end of the guide tube 13 is fixedly connected to the second fixing plate 19, and the other end of the guide tube 13 extends into the internal cavity of the C-shaped ball 11 and seals with it. The guide tube 13 and the C-shaped ball 11 seal with each other, and the outer surface of the ball 11 seals with the valve seat 15, together forming a double-sealing structure. The double-sealing structure can prevent the medium from entering the valve cavity between the inner wall of the valve body 1 and the outer wall of the ball 11 during valve opening and closing, and avoids the medium from directly contacting the mating surface of the ball 11 and the valve seat 15.

[0035] The first fixing plate 12 has an annular structure, and its inner circumference abuts against the outer wall of the valve seat 15 and the outer wall of the spring support ring 16, respectively, to limit the radial displacement of the valve seat 15 and the spring support ring 16. The second fixing plate 19 has an annular structure, and its inner circumference is fixedly connected to the outer wall of the guide tube 13 to limit the axial displacement of the guide tube 13. During disassembly, after disconnecting the first fixing plate 12, the second fixing plate 19 from the fixing plate, the ball 11, the valve seat 15, the spring support ring 16, and the guide tube 13 can be directly removed without the need for external tooling to open the valve seat 15.

[0036] A first self-lubricating bearing 8 is provided between the mating hole of the upper valve stem 4 and the valve cover 2, and a second self-lubricating bearing 17 is provided between the mating hole of the lower valve stem 14 and the bottom of the valve body 1. The inner wall of the first self-lubricating bearing 8 slides with the outer wall of the upper valve stem 4, and the inner wall of the second self-lubricating bearing 17 slides with the outer wall of the lower valve stem 14. This reduces the rotational frictional resistance of the upper valve stem 4 and the lower valve stem 14 when the valve is opened and closed, thereby reducing the opening and closing torque of the valve.

[0037] The spring support ring 16 includes an annular seat and compression springs 21 evenly distributed circumferentially along the annular seat 20. One end of the compression spring 21 abuts against the annular seat 20, and the other end abuts against the end face of the valve seat 15 away from the ball 11. This applies an elastic preload force to the valve seat 15 toward the ball 11, ensuring uniform contact between the mating surfaces of the valve seat 15 and the ball 11.

[0038] The valve cover 2 is provided with a packing ring 7 on the top and is sleeved on the outside of the upper valve stem 4. The packing plate 6 is sleeved on the outside of the upper valve stem 4 and located above the packing ring 7. The bottom of the packing plate 6 abuts against the top of the packing ring 7 so that the packing ring 7 forms a tight seal at the mating part of the upper valve stem 4 and the valve cover 2.

[0039] The top of the bracket 3 is provided with a valve stem sleeve plate 5, which is fitted onto the outside of the upper valve stem 4 to limit the radial movement of the upper valve stem 4. The valve cover 2 is fixedly connected to the fixing plate 10 by bolts. The fixing plate 10 is disc-shaped, and its central hole is fitted onto the outside of the upper valve stem 4. A first thrust washer 9 is provided between the fixing plate 10 and the upper valve stem 4, and a second thrust washer 18 is provided between the lower valve stem 14 and the bottom of the valve body 1. The first thrust washer 9 limits the axial movement of the upper valve stem 4, and the second thrust washer 18 limits the axial movement of the lower valve stem 14.

[0040] The axis of the internal cavity of the C-shaped sphere 11 is collinear with the axis of the guide tube 13, and the inner diameter of the internal cavity of the C-shaped sphere 11 is equal to the inner diameter of the guide tube 13, so as to ensure that there is no significant change in flow resistance when the medium flows through the guide tube 13 and the interior of the C-shaped sphere 11, and to maintain the stability of the medium flow.

[0041] The valve body 1, ball 11, and guide tube 13 are all made of stainless steel to withstand high temperature, high pressure, or corrosive conditions. The mating surfaces of the valve seat 15 are made of polytetrafluoroethylene or para-polystyrene. This provides both wear resistance and sealing performance, extending the service life of the mating pair formed by the valve seat 15 and the ball 11.

[0042] The inner peripheral wall of the first fixing plate 12 is provided with guide slopes, which face the end of the valve seat 15 and the end of the spring support ring 16, respectively. The inner peripheral wall of the second fixing plate 19 is provided with guide slopes, which face the end of the guide tube 13, so as to facilitate quick positioning of the valve seat 15, spring support ring 16 and guide tube 13 during installation and improve assembly efficiency.

[0043] Working principle: The power transmission path involves an external operating force acting on the bracket 3, causing the upper valve stem 4, which passes axially through the bracket 3 and valve cover 2, to rotate synchronously. The lower end of the upper valve stem 4 is fixedly connected to a C-shaped ball 11, directly driving the ball 11 to rotate around its own axis. Simultaneously, the lower end of the ball 11 is fixed to the lower valve stem 14, which passes axially through the bottom of the valve body 1. The lower valve stem 14 rotates synchronously with the ball 11, jointly limiting the radial displacement of the ball 11 and ensuring coaxial rotation.

[0044] Medium flow logic: Open state: When the ball 11 rotates to the "conducting position", its internal closed cavity is completely aligned with the guide pipe 13 (both ends are connected to the second fixing plate 19 and the ball 11 respectively). The medium enters the guide pipe 13 from the flow channel of the valve body 1, flows smoothly into the internal cavity of the ball 11 through the guide pipe 13, and then flows out along the cavity to the downstream flow channel, realizing medium flow. Closed state: When the ball 11 rotates to the "blocking position", the outer wall of the ball 11 directly covers the outlet end of the guide pipe 13, and at the same time, the outer surface of the ball 11 is tightly attached to the valve seat 15, blocking the medium from flowing from the guide pipe 13 to the downstream flow channel, realizing medium cut-off.

[0045] The axis of the cavity inside the sphere 11 is collinear with the axis of the guide tube 13, and the inner diameter of the cavity is equal to the inner diameter of the guide tube 13. When the medium flows through the guide tube 13 and the cavity of the sphere 11, there is no obvious change in the flow path, which avoids local eddies or pressure loss and ensures flow stability.

[0046] One end of the guide tube 13 is restricted from axial displacement by the second fixing plate 19 (annular structure, with its inner circumference fixed to the outer wall of the guide tube 13), and the other end extends into the closed cavity inside the ball 11, with the outer wall of the guide tube 13 and the inner wall of the ball 11 forming a static seal. This seal can directly block the medium from seeping out from the gap between the guide tube 13 and the ball 11, preventing the medium from entering the valve cavity between the inner wall of the valve body 1 and the outer wall of the ball 11, thus reducing the contact between the medium and the outer wall of the ball 11 from the source.

[0047] In the spring support ring 16 (including the annular seat 20 and the circumferentially evenly distributed compression springs 21), the annular seat 20 is fixed to the inner wall of the valve body 1, one end of the compression spring 21 abuts against the annular seat 20, and the other end applies an elastic preload towards the ball 11 to the valve seat 15, ensuring that the valve seat 15 is always in close contact with the outer surface of the ball 11 during the rotation of the ball 11, forming a dynamic sealing surface.

[0048] The outer sealing surface (the mating surface between the ball 11 and the valve seat 15) further blocks "trace amounts of media that may leak from the inner sealing gap," while also preventing particulate impurities in the media from getting trapped between the sealing surfaces. This dual sealing works in tandem to prevent the media from entering the valve cavity and causing sedimentation and jamming, while also protecting the sealing surfaces from scratches by impurities and extending the life of the sealing pair.

[0049] A first self-lubricating bearing 8 is provided between the mating hole of the upper valve stem 4 and the valve cover 2, and a second self-lubricating bearing 17 is provided between the mating hole of the lower valve stem 14 and the bottom of the valve body 1. The inner walls of the two types of bearings slide with the outer walls of the corresponding valve stems, which greatly reduces the frictional resistance when the valve stem rotates, reduces the valve opening and closing torque, and makes operation easier.

[0050] The bottom of the valve cover 2 is fixed with a fixing plate 10 (the upper valve stem 4 is fitted in the center hole) by bolts. A first thrust washer 9 is provided between the fixing plate 10 and the upper valve stem 4 to restrict the axial movement of the upper valve stem 4. A second thrust washer 18 is provided between the lower valve stem 14 and the bottom of the valve body 1 to restrict the axial displacement of the lower valve stem 14 and prevent the valve stem from moving and causing a decrease in the sealing accuracy between the ball 11 and the valve seat 15.

[0051] The first fixing plate 12 (annular structure) is sleeved on the outside of the spring support ring 16, and its inner circumference abuts against the outer wall of the valve seat 15 and the outer wall of the spring support ring 16, respectively, limiting the radial displacement of the valve seat 15 and the spring support ring 16. The second fixing plate 19 is sleeved on the outside of the guide tube 13, limiting the axial loosening of the guide tube 13 and ensuring the stability of the position of each core component.

[0052] The first fixing plate 12 is connected to the inner wall of the valve body 1, and the second fixing plate 19 is fitted to the inner wall of the valve body 1. When disassembling, it is only necessary to disconnect the two from the valve body 1 (such as loosening the bolts) to directly remove the ball 11, valve seat 15, spring support ring 16 and guide pipe 13 without the need for external tooling to open the valve seat 15, thus reducing maintenance time and labor costs.

[0053] The valve cover 2 is equipped with a packing ring 7 (on which the upper valve stem 4 is fitted), and a packing pressure plate 6 is fitted above it. The bottom of the packing pressure plate 6 abuts against the top of the packing ring 7. The packing ring 7 forms a tight seal between the upper valve stem 4 and the valve cover 2, preventing the medium from leaking from the gap between the valve stem and the valve cover. The bracket 3 is equipped with a valve stem bushing plate 5 (on which the upper valve stem 4 is fitted), which limits the radial wobble of the upper valve stem 4 when it rotates, and prevents the valve stem from shifting, which could lead to bearing wear or misalignment of the sealing surface.

[0054] The valve body 1, ball 11, and guide tube 13 are made of stainless steel, which can withstand high temperature, high pressure, and corrosive media; the mating surface of the valve seat 15 is made of polytetrafluoroethylene or para-polystyrene, which combines wear resistance and elastic fit. Even under harsh working conditions, it can still ensure sealing reliability and component service life, reducing frequent replacement costs.

[0055] Therefore, the present invention adopts the above-mentioned type C forced sealing ball valve, which improves sealing reliability, simplifies disassembly and assembly process, reduces maintenance costs, and enhances the stability of opening and closing process and structure through the internal sealing of the guide pipe and the ball, and the external sealing of the ball and the valve seat.

[0056] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A C-type forced seal ball valve, characterized in that, The valve body, the valve cover, the bracket, the upper valve rod, the ball, the first fixed plate, the flow guide pipe, the lower valve rod, the valve seat, the spring support ring and the second fixed plate are included. The valve cover is covered on the top of the valve body. The bracket is fixed above the valve cover. The upper valve rod is axially arranged in the bracket and the valve cover. The ball is fixedly connected with the lower end of the upper valve rod. The valve seat is matched with the outer surface of the ball. The spring support ring is connected with the side of the valve seat away from the ball. The first fixed plate is sleeved on the spring support ring. The first fixed plate is located outside the valve seat and is connected with the inner wall of the valve body. The lower valve rod is axially arranged in the bottom of the valve body and is fixedly connected with the lower end of the ball. The second fixed plate is sleeved outside the flow guide pipe. The two ends of the flow guide pipe are respectively connected with the second fixed plate and the ball.

2. A C-type forced seal ball valve according to claim 1, characterized in that The first fixed plate is annular. The inner periphery of the first fixed plate is respectively abutted with the outer side wall of the valve seat and the outer side wall of the spring support ring. The second fixed plate is annular. The inner periphery of the second fixed plate is fixedly connected with the outer wall of the flow guide pipe.

3. A C-type forced seal ball valve according to claim 1, characterized in that The first self-lubricating bearing is arranged between the upper valve rod and the matching hole of the valve cover. The second self-lubricating bearing is arranged between the lower valve rod and the matching hole of the bottom of the valve body. The inner wall of the first self-lubricating bearing is slidingly matched with the outer wall of the upper valve rod. The inner wall of the second self-lubricating bearing is slidingly matched with the outer wall of the lower valve rod.

4. A C-type forced seal ball valve according to claim 1, characterized in that The spring support ring includes an annular seat body and compression springs which are uniformly distributed along the circumference of the annular seat body. One end of the compression spring is abutted with the annular seat body. The other end of the compression spring is abutted with the end face of the valve seat away from the ball.

5. A C-type forced seal ball valve according to claim 1, characterized in that, The top of the valve cover is provided with a packing press ring which is sleeved outside the upper valve rod. A packing pressing plate is sleeved outside the upper valve rod and is located above the packing press ring. The bottom of the packing pressing plate is abutted with the top of the packing press ring.

6. A C-type forced seal ball valve according to claim 1, characterized in that The top of the bracket is provided with a valve rod sleeve plate which is sleeved outside the upper valve rod. The valve cover is fixedly connected with the fixed disc through bolts. The fixed disc is disc-shaped. The central hole of the fixed disc is sleeved outside the upper valve rod. The first thrust washer is arranged between the fixed disc and the upper valve rod. The second thrust washer is arranged between the lower valve rod and the bottom of the valve body.

7. A C-type forced seal ball valve according to claim 1, characterized in that The axis of the internal cavity of the ball is collinear with the axis of the flow guide pipe. The inner diameter of the internal cavity of the ball is equal to the inner diameter of the flow guide pipe.

8. A C-type forced seal ball valve according to claim 1, characterized in that, The materials of the valve body, the ball and the flow guide pipe are stainless steel. The matching surface of the valve seat is made of polytetrafluoroethylene or para-polyphenyl material.

9. A C-type forced seal ball valve according to claim 1, characterized in that, The inner peripheral wall of the first fixed plate is provided with a guide inclined surface which respectively faces the end of the valve seat and the end of the spring support ring. The inner peripheral wall of the second fixed plate is provided with a guide inclined surface which faces the end of the flow guide pipe.

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