Top-mounted wear-resistant ball valve

Abstract

The utility model discloses a top-mounted wear-resistant ball valve which comprises a valve body, a valve cover is fixedly installed on the top of the valve body through a bolt, a valve ball is installed in the valve body, a lower fixing shaft is integrally formed in the center of the bottom of the valve body, a valve rod is integrally formed on the top of the valve ball, and a driving device is fixedly installed on the top of the valve cover and connected with the top of the valve rod. A left cylindrical valve seat and a right cylindrical valve seat are sleeved with a left inlet and a right inlet of the valve body, threaded sleeves are arranged at the outer ends of the left valve seat and the right valve seat respectively, elastic supporting devices are circumferentially distributed between the left valve seat and the threaded sleeves and between the right valve seat and the threaded sleeves, and an annular stepped left inner cavity is formed in the inner wall of the left valve seat. The side-mounted left valve seat and the side-mounted right valve seat can be rapidly replaced by detaching the threaded sleeves, pressure is prevented from directly acting on the inner wall of the valve body, the annular step left inner cavity is a stepped pressure reduction channel, medium erosion is reduced, the elastic supporting device dynamically compensates pressure fluctuation, it is guaranteed that the attaching pressure of the valve ball and the left valve seat and the attaching pressure of the valve ball and the right valve seat are constant, and the service life of the valve ball is prolonged. The medium leakage rate is reduced, and the sealing life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a top-mounted wear-resistant ball valve. Background Technology

[0002] A ball valve is a type of valve that uses a ball as its core opening and closing element. It belongs to the rotary valve category and is mainly used to cut off or connect fluid media in pipelines. Its core component is a ball with a through-hole, which is opened or closed by rotating 90 degrees. When the through-hole of the ball is aligned with the pipeline axis, fluid can flow smoothly; when the ball rotates to the point where the through-hole is perpendicular to the pipeline, the flow is completely blocked.

[0003] Conventional top-entry ball valves are assembled by installing the valve seat from the top of the valve body. Then, in a confined space, specialized tooling is used to pre-tighten the left and right valve seats. The pre-tightening process ensures the gap between the double-sealed valve seats is greater than the ball's spacing before inserting the ball. This is time-consuming and labor-intensive, hindering quick assembly. Furthermore, the assembly process easily causes collisions between the valve seat, valve body, and ball, ultimately affecting the valve's performance. In contrast, ordinary valve bodies have a straight cylindrical inlet. When the medium flows from the high-pressure end to the low-pressure end, the straight-cylinder valve only has a narrow passage at the valve seat. This causes the entire pressure difference to be concentrated and released instantaneously at this point. The sudden reduction in the passage's cross-sectional area leads to a surge in flow velocity, directly eroding the sealing surface and causing rapid wear of the coating. Utility Model Content

[0004] The purpose of this utility model is to provide a top-mounted wear-resistant ball valve that solves the problems of inconvenient valve seat replacement, low wear resistance, easy erosion of the sealing surface, and short service life in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A top-mounted wear-resistant ball valve includes a valve body, a valve cover bolted to the top of the valve body, a valve ball installed inside the valve body, the valve ball being located at the center of the valve body, and a lower fixed shaft integrally formed at the bottom center, the valve ball rotating within the valve body via the lower fixed shaft, a valve stem integrally formed at the top of the valve ball, the valve stem being coaxial with the lower fixed shaft, the valve stem sealingly engaging with the valve cover and rotating within the valve cover, a drive device fixedly mounted on the top of the valve cover, the drive device being connected to the top of the valve stem, and the valve... The valve body has cylindrical left and right valve seats fitted to its left and right inlets and outlets, respectively. The contact surfaces of the left and right valve seats with the valve ball are sealing surfaces. The outer ends of the left and right valve seats are respectively provided with threaded sleeves, which are threaded to the left and right inlets and outlets of the valve body. The outer diameter of the left and right valve seats is the same as the inner diameter of the threaded sleeves, and the inner diameter of the left and right valve seats is the same as the inner diameter of the valve ball. Elastic support devices are distributed circumferentially between the left and right valve seats and the threaded sleeves. The inner wall of the left valve seat has an integrally formed annular stepped left inner cavity.

[0007] Preferably, the outer end faces of the left and right valve seats have multiple spring grooves, and springs are placed in the spring grooves.

[0008] Preferably, the inner wall of the outer end of the left valve seat and the right valve seat is provided with a guide annular groove, and the inner wall of the inner end of the threaded sleeve is provided with a guide ring, and the guide ring is slidably connected to the guide annular groove.

[0009] Preferably, the valve ball, left valve seat, and right valve seat are coated with a nano-ceramic coating.

[0010] Preferably, the nano-ceramic coating is an Al2O3-TiC ceramic composite material.

[0011] Preferably, the inner diameter of the right valve seat is a straight right inner cavity.

[0012] Preferably, the inner diameter of the right valve seat is a right inner cavity of an annular step, and the right inner cavity of the annular step is structurally symmetrical with the left inner cavity of the annular step.

[0013] Preferably, the left and right valve seats are fitted with sealing rings on their outer circumferences for sealing with the inner wall of the valve body.

[0014] Preferably, the drive device is fixedly installed to the valve cover by an L-shaped bracket and bolts. A packing is provided at the contact position between the valve stem and the top of the valve cover, and a pressure cap is provided on the top of the packing. The pressure cap is fixed to the valve cover by bolts.

[0015] The advantages of this utility model compared with the prior art are as follows:

[0016] The side-mounted left and right valve seats can be quickly replaced by removing the threaded sleeve. When the medium flows, the pressure is prevented from acting directly on the inner wall of the valve body, thus protecting the valve body. The annular stepped left inner cavity forms a stepped pressure reduction channel, reducing medium erosion. The elastic support device dynamically compensates for pressure fluctuations, ensuring that the valve ball and the left and right valve seats have a constant contact pressure, reducing the medium leakage rate and extending the sealing life. Attached Figure Description

[0017] Figure 1 This is a longitudinal sectional view of Embodiment 1 of this utility model;

[0018] Figure 2 This is an enlarged view of A in Embodiment 1 of this utility model;

[0019] Figure 3 This is a longitudinal sectional view of Embodiment 2 of this utility model;

[0020] Icons: 1. Valve body; 2. Valve cover; 3. Valve ball; 31. Lower fixed shaft; 4. Valve stem; 5. Drive unit; 51. Bracket; 6. Left valve seat; 61. Annular step left inner cavity; 62. Sealing ring; 7. Right valve seat; 71. Straight cylinder right inner cavity; 72. Annular step right inner cavity; 8. Screw sleeve; 9. Elastic support device; 91. Spring groove; 92. Spring; 93. Guide annular groove; 94. Guide ring; 10. Packing. Detailed Implementation

[0021] To make the objectives, methods, and advantages of the embodiments of this utility model clearer, the method solutions in the embodiments of this utility model are described clearly and completely. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Example 1

[0023] like Figure 1-2As shown, a top-mounted wear-resistant ball valve includes a valve body 1. The valve body 1 is sealed to a pipeline via flanges and gaskets on both sides. A valve cover 2 is bolted to the top of the valve body 1, and the connection surface is sealed by a gasket. A valve ball 3 is installed inside the valve body 1. The valve ball 3 rotates to make its inner hole communicate with the inlet and outlet of the valve body 1. The valve ball 3 is located at the center of the valve body 1, and a lower fixed shaft 31 is integrally formed at the bottom center. The valve ball 3 rotates along the inside of the valve body 1 via the lower fixed shaft 31. A valve stem 4 is integrally formed at the top of the valve ball 3. The valve stem 4 is coaxial with the lower fixed shaft 31. The valve stem 4 is sealed to the valve cover 2 by a rubber ring and can rotate along the inside of the valve cover 2. A drive device 5 is fixedly installed on the top of the valve cover 2. The drive device 5 is connected to the top of the valve stem 4. The drive device 5 rotates a wheel manually to drive an internal worm gear, causing the valve stem 4 to rotate. This is an existing technology and will not be described in detail here. The valve body 1 has a valve body 1 with flanges and gaskets on both sides. The inlet and outlet are respectively fitted with cylindrical left valve seats 6 and right valve seats 7. The contact surfaces of the left valve seats 6 and right valve seats 7 with the valve ball 3 are sealing surfaces. The outer ends of the left valve seats 6 and right valve seats 7 are respectively provided with threaded sleeves 8, which are threadedly connected to the left and right inlets and outlets of the valve body 1. The left valve seats 6 and right valve seats 7 are side-mounted, abandoning the complex installation process of conventional top-mounted types. The left valve seats 6 and right valve seats 7 can be easily and conveniently installed directly from the left and right sides of the valve body into the valve body channel. When valve seat 7 is severely damaged to the point of being scrapped, it is easier to quickly disassemble and replace it. The outer diameter of the left valve seat 6 and the right valve seat 7 is the same as the inner diameter of the threaded sleeve 8, and the inner diameter of the left valve seat 6 and the right valve seat 7 is the same as the inner diameter of the valve ball 3. The pressure of the medium flowing through the valve is directly applied to the inner walls of the left valve seat 6 and the right valve seat 7. The left valve seat 6 and the right valve seat 7 are easy to replace, increasing the service life of the valve body 1. Elastic support devices 9 are distributed circumferentially between the left valve seat 6 and the right valve seat 7 and the threaded sleeve 8. The inner wall of the left valve seat 6 is integrally formed with an annular stepped left inner cavity 61. The annular stepped left inner cavity 61 has a gradually decreasing diameter, that is, from the left end of the left valve seat 6 where the medium flows in, the inner diameter of the channel decreases from the outside to the inside, forming a step-like shape. The change in channel diameter at each step is relatively small and uniform, which can achieve gradual pressure reduction of the medium. When the high-pressure medium enters the left valve seat 61, it first flows into the first channel with a larger diameter. As the medium flows forward to the first step, the channel diameter suddenly decreases. According to fluid mechanics principles, under a constant flow rate, a smaller channel cross-sectional area leads to an increase in flow velocity and a decrease in pressure, achieving the first pressure reduction. Then the medium continues to flow into the next channel with a smaller diameter, and so on. Through multiple steps of pressure reduction, the pressure of the medium gradually decreases, and the flow velocity is correspondingly controlled, decomposing destructive energy layer by layer and extending the service life of the sealing surface from the root. The inner diameter of the right valve seat 7 is a straight right inner cavity 71. The straight right inner cavity 71 is the valve outlet end, such as... Figure 1As indicated by the arrow, the medium inside valve body 1 flows unidirectionally from left to right. The valve inlet is equipped with a stepped diameter reduction system, and the valve outlet maintains a straight flow channel structure to avoid abnormal pressure drop in reverse flow and optimize forward flow performance.

[0024] Multiple spring grooves 91 are formed on the outer end faces of the left valve seat 6 and the right valve seat 7. Springs 92 are placed within these spring grooves 91. The spring grooves 91 are evenly distributed circumferentially to ensure uniform support force of the springs 92 on the left and right valve seats 6 and 7. To prevent the springs 92 from moving and to ensure elastic expansion and contraction in the left and right directions, the natural length of the springs 92 is much greater than the depth of the spring grooves 91 to ensure normal operation. When wear creates a gap between the valve ball 3 and the sealing surfaces of the left and right valve seats 6 and 7, the pre-compressed springs 92 push the left or right valve seat 6 against the surface of the ball valve 3. As the wear of the left or right valve seat 6 reduces its thickness, the gap between the valve ball 3 and the left or right valve seat 6 increases, causing the springs to automatically release. Because the pre-tension is not fully released, the springs continue to push the left or right valve seat 6 or 7 outwards, compensating for wear and increasing the service life of the left or right valve seat 6 or 7.

[0025] The inner walls of the outer ends of the left valve seat 6 and the right valve seat 7 are provided with guide annular grooves 93, and the inner walls of the inner ends of the threaded sleeve 8 are provided with guide rings 94. The guide rings 94 are slidably connected to the guide annular grooves 93. The axial length of the guide annular grooves 93 is less than the axial length of the guide rings 94 to prevent the spring 92 from being over-compressed, and also to ensure that the left valve seat 6 or the right valve seat 7 remains concentric with the valve ball 3 when it moves axially.

[0026] The valve ball 3, left valve seat 6, and right valve seat 7 are coated with a nano-ceramic coating. The nano-ceramic coating is an Al2O3-TiC ceramic composite material. This ceramic composite material has the characteristics of high hardness and good wear resistance, and can effectively resist the impact and erosion caused by cavitation effect, thereby improving the cavitation erosion resistance of the left valve seat 6 and right valve seat 7 and reducing the occurrence of pitting corrosion on the sealing surface.

[0027] The left valve seat 6 and the right valve seat 7 are fitted with sealing rings 62 on their outer circumferences for sealing with the inner wall of the valve body 1.

[0028] The drive device 5 is bolted to the valve cover 2 via an L-shaped bracket 51. A packing 10 is provided at the contact position between the valve stem 4 and the top of the valve cover 2, and a pressure cap is provided on the top of the packing 10. The pressure cap is fixed to the valve cover 2 by bolts.

[0029] In the specific implementation process, when the drive device 5 manually rotates the wheel to drive the worm gear, causing the valve stem 4 to rotate, the valve ball 3 rotates synchronously with the valve stem 4. When the inner hole of the valve ball 3 is aligned with the inlet and outlet of the valve body 1, the medium flows in from the left side, passes through the annular step of the left valve seat 6 in the left inner cavity 61, and after the pressure is reduced step by step, it passes through the inner hole of the valve ball and finally flows out from the straight cylinder of the right valve seat 7 in the right inner cavity 71, reducing the impact of the medium on the sealing surface. The spring 92 is pre-compressed and installed between the left valve seat 6, the right valve seat 7 and the threaded sleeve 8. When the valve seat sealing surface has a gap due to wear, the spring automatically releases its elastic force, pushing the valve seat to move towards the valve ball 3 to compensate for the wear and maintain tight contact of the sealing surface. The sliding fit between the guide ring 94 and the guide annular groove 93 ensures that the valve seat maintains concentricity with the valve ball when moving, avoiding leakage caused by misalignment.

[0030] Example 2

[0031] To enable the valve to achieve controllable pressure drop, cavitation resistance, and bidirectional delivery, improvements were made based on Example 1, such as... Figure 3 As shown, in this embodiment, the inner diameter of the right valve seat 7 is the right inner cavity 72 of the annular step, and the right inner cavity 72 of the annular step is structurally symmetrical with the left inner cavity 61 of the annular step.

[0032] In practical implementation, it can be applied to bidirectional flow of valves, such as bidirectional pipeline transportation and emergency backflow conditions, so that valves can achieve controllable pressure drop and cavitation resistance in both forward and reverse directions.

[0033] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A top-mounted wear-resistant ball valve, comprising a valve body (1), a valve cover (2) is bolted and mounted on the top of the valve body (1), and a valve ball (3) is installed in the valve body (1), characterized in that, The valve ball (3) is located at the center of the valve body (1), and a lower fixed shaft (31) is integrally formed at the bottom center. The valve ball (3) rotates inside the valve body (1) through the lower fixed shaft (31). A valve stem (4) is integrally formed at the top of the valve ball (3). The valve stem (4) is coaxial with the lower fixed shaft (31). The valve stem (4) is sealed to the valve cover (2) and rotates inside the valve cover (2). A drive device (5) is fixedly installed on the top of the valve cover (2). The drive device (5) is connected to the top of the valve stem (4). Cylindrical sleeves are respectively fitted to the left and right inlets and outlets of the valve body (1). The left valve seat (6) and the right valve seat (7) have a sealing surface with the valve ball (3). The outer ends of the left valve seat (6) and the right valve seat (7) are respectively provided with threaded sleeves (8). The threaded sleeves (8) are threaded to the left and right inlets and outlets of the valve body (1). The outer diameter of the left valve seat (6) and the right valve seat (7) is the same as the inner diameter of the threaded sleeve (8). The inner diameter of the left valve seat (6) and the right valve seat (7) is the same as the inner diameter of the valve ball (3). Elastic support devices (9) are distributed circumferentially between the left valve seat (6) and the right valve seat (7) and the threaded sleeve (8). The inner wall of the left valve seat (6) is integrally formed with an annular stepped left inner cavity (61).

2. The top-mounted wear-resistant ball valve according to claim 1, characterized in that, The outer end faces of the left valve seat (6) and the right valve seat (7) are provided with multiple spring grooves (91), and springs (92) are placed in the spring grooves (91).

3. The top-mounted wear-resistant ball valve according to claim 2, characterized in that, The inner wall of the outer end of the left valve seat (6) and the right valve seat (7) is provided with a guide annular groove (93), and the inner wall of the inner end of the threaded sleeve (8) is provided with a guide ring (94). The guide ring (94) is slidably connected to the guide annular groove (93).

4. The top-mounted wear-resistant ball valve according to claim 1, characterized in that, The valve ball (3), left valve seat (6) and right valve seat (7) are coated with a nano-ceramic coating.

5. A top-mounted wear-resistant ball valve according to claim 4, characterized in that, The nano-ceramic coating is an Al2O3-TiC ceramic composite material.

6. The top-mounted wear-resistant ball valve according to claim 1, characterized in that, The inner diameter of the right valve seat (7) is a straight right inner cavity (71).

7. The top-mounted wear-resistant ball valve according to claim 1, characterized in that, The inner diameter of the right valve seat (7) is the right inner cavity (72) of the annular step, and the right inner cavity (72) of the annular step is structurally symmetrical with the left inner cavity (61) of the annular step.

8. A top-mounted wear-resistant ball valve according to claim 1, characterized in that, The left valve seat (6) and the right valve seat (7) are fitted with sealing rings (62) on their outer circumferences for sealing with the inner wall of the valve body (1).

9. A top-mounted wear-resistant ball valve according to claim 1, characterized in that, The drive device (5) is fixedly installed to the valve cover (2) by bolts through an L-shaped bracket (51). The valve stem (4) is provided with a packing (10) at the contact position with the top of the valve cover (2), and a pressure cap is provided on the top of the packing (10). The pressure cap is fixed to the valve cover (2) by bolts.

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