Straight-through two-way ball valve

Abstract

A straight-through two-way ball valve includes: a connector extending along a first direction, with a sealing gasket fixedly connected around the connector, and a first valve seat abutting one side of the sealing gasket and a second valve seat abutting the other side of the sealing gasket; a handle fixedly connected to the connector, with a valve stem extending along a second direction perpendicular to the first direction fixedly connected inside the handle, and a ball fixedly connected to one end of the valve stem; wherein the sealing gasket includes a first sealing layer fixedly connected to the connector, and a second sealing layer fixedly connected to the first sealing layer and located on the side of the first sealing layer away from the connector, the ball abutting the first valve seat and the second valve seat, the angle between the first valve seat and the first direction being denoted as A1, the angle between the second valve seat and the first direction being denoted as A2, and satisfying the relationship: A1 > A2.

Description

Technical Field

[0001] This utility model relates to the field of fluid control machinery, and in particular to a straight-through two-way ball valve. Background Technology

[0002] The straight-through two-way ball valve is a fluid control device widely used in industries such as petroleum, chemical, power, and pharmaceuticals. Its core function is to achieve rapid opening and closing of pipelines or flow regulation by rotating the ball. A typical structure of this valve includes a valve body, ball, seat, gasket, stem, and actuator (such as a handle or actuator). When the through-hole of the ball is aligned with the pipeline axis, the valve is fully open, allowing the medium to flow smoothly. After rotating 90 degrees, the solid part of the ball blocks the flow path, achieving a sealed closure.

[0003] Currently, the valve seats in existing ball valves on the market typically employ a single-bevel or flat structure, resulting in a limited contact area with the ball. This leads to localized stress concentration under high-pressure conditions, accelerating seat wear (especially in media containing solid particles). After wear, microscopic gaps easily form between the valve seat and the ball, causing media leakage. Furthermore, the sealing gaskets in existing ball valves are mostly made of single PTFE (polytetrachloroethylene) or rubber materials. These materials are prone to swelling, hardening, or chemical degradation when exposed to strong acids, strong alkalis, or organic solvents for extended periods. After prolonged use, aged gaskets also lose elasticity to some extent, failing to effectively fill the microscopic gaps between flanges or joints, leading to leakage.

[0004] Therefore, it is necessary to provide a straight-through two-way ball valve that can effectively reduce valve seat wear and prevent media leakage. Utility Model Content

[0005] The purpose of this invention is to provide a straight-through two-way ball valve that can effectively reduce valve seat wear and prevent media leakage.

[0006] According to one aspect of this application, a straight-through two-way ball valve is provided, the ball valve comprising:

[0007] The connector extends in a first direction, and a sealing gasket is fixedly connected around the connector. A first valve seat that abuts against one side of the sealing gasket and a second valve seat that abuts against the other side of the sealing gasket are also fixedly connected.

[0008] A handle is fixedly connected to the connector, and a valve stem extending in a second direction perpendicular to the first direction and a ball fixedly connected to one end of the valve stem are fixedly connected inside the handle.

[0009] The sealing gasket includes a first sealing layer fixedly connected to the joint, and a second sealing layer fixedly connected to the first sealing layer and located on the side of the first sealing layer away from the joint. The ball abuts against the first valve seat and the second valve seat. The angle between the first valve seat and the first direction is denoted as A1, and the angle between the second valve seat and the first direction is denoted as A2, and the relationship is satisfied: A1 > A2.

[0010] Better yet, satisfy the relation:

[0011] 15°≤A1≤20°.

[0012] Better yet, satisfy the relation:

[0013] 5°≤A2≤8°.

[0014] More preferably, the material of the first sealing layer is any one or a combination of graphite, corrugated metal sheet, aramid fiber reinforced rubber, stainless steel and nickel-based alloy.

[0015] More preferably, the material of the second sealing layer is any one or a combination of polytetrachloroethylene, polyetheretherketone, perfluoroether rubber, ultra-high molecular weight polyethylene, silicon carbide and nickel alloy.

[0016] More preferably, the connector further includes a first connector located at one end in the first direction and a second connector located at the other end in the first direction;

[0017] The sealing gasket is integrally formed along the first direction, and the first sealing layer is fixedly connected to the first connector and the second connector respectively.

[0018] More preferably, a through hole is integrally formed on the sphere, and the connector extends along the first direction to form a pipeline;

[0019] The through hole has the same cross-sectional dimensions as the pipeline.

[0020] More preferably, when the handle is rotated circumferentially along the second direction, the valve stem drives the ball to rotate. If the through hole coincides or partially coincides with the projection of the pipeline in the first direction, the medium enters the second connector through the first connector.

[0021] More preferably, the ball valve further includes:

[0022] The valve body is fixedly connected to the connector and is located on the side of the connector where the first valve seat is located;

[0023] A packing gasket abuts against the valve body and is located between the valve body and the packing rod.

[0024] More preferably, the ball valve further includes:

[0025] A packing gland is fixedly connected between the valve stem and the valve body;

[0026] The space between the packing gland and the packing pad is filled with packing material to prevent the medium in the pipeline from entering the handle.

[0027] This utility model has the following beneficial effects:

[0028] By incorporating a first valve seat and a second valve seat, both designed with inclined surfaces forming an angle with the first direction of the connector's extension, the contact area between the ball and the connector is increased, along with the pre-tightening force exerted by the connector on the ball in the first direction. Furthermore, the design employs different angles between the first and second valve seats and the first direction, with A1 greater than A2. This allows the first valve seat to seal the ball under high-pressure conditions, while the second valve seat can pre-tighten and seal the ball under lower-pressure conditions, preventing sudden stress changes on the contact surface during high-low pressure transitions and effectively mitigating valve seat wear. The sealing gasket is designed as a double-layer structure with a first sealing layer and a second sealing layer. The second sealing gasket contacts the flowing medium within the connector, while the first sealing gasket is positioned between the second sealing gasket and the connector, enhancing the corrosion resistance of the sealing layer and effectively preventing media leakage. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a three-dimensional structural diagram of the ball valve described in one embodiment of this application;

[0031] Figure 2 As described in one embodiment of this application Figure 1 A cross-sectional view of the inner edge cutting line AA;

[0032] Figure 3 As described in one embodiment of this application Figure 2 A simplified schematic diagram of the planar structure at point A inside.

[0033] Reference numerals: 100, ball valve; 10, connector; 11, gasket; 11A, first sealing layer; 11B, second sealing layer; 12, first valve seat; 13, second valve seat; 14, first connector; 15, second connector; 16, pipeline; 20, handle; 21, valve stem; 22, ball; 22A, through hole; 30, valve body; 40, packing gasket; 50, packing gland; F1, first direction; F2, second direction. Detailed Implementation

[0034] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0035] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0037] Please refer to Figure 1 - Figure 3 One embodiment of this application provides a straight-through two-way ball valve 100, which includes a connector 10 and a handle 20.

[0038] The connector 10 extends along a first direction F1. A sealing gasket 11 is fixedly connected around the connector 10. A first valve seat 12 abuts against one side of the sealing gasket 11, and a second valve seat 13 abuts against the other side of the sealing gasket 11 are also fixedly connected to the connector 10. The handle 20 is fixedly connected to the connector 10. A valve stem 21 extending along a second direction F2 perpendicular to the first direction F1 is fixedly connected to the handle 20. A ball 22 is fixedly connected to one end of the valve stem 21. The sealing gasket 11 includes a first sealing layer 11A fixedly connected to the connector 10, and a second sealing layer 11B fixedly connected to the first sealing layer 11A and located on the side of the first sealing layer 11A away from the connector 10. The ball 22 abuts against the first valve seat 12 and the second valve seat 13. The angle between the first valve seat 12 and the first direction F1 is denoted as A1, and the angle between the second valve seat 13 and the first direction F1 is denoted as A2, and the relationship is satisfied: A1 > A2.

[0039] The larger angle of the main sealing angle A1 creates a wedge-shaped sealing effect between the ball 22 and the valve seat under medium pressure. Higher pressure results in a greater sealing specific pressure, forming a self-tightening seal. This also reduces local stress by increasing the contact area. The smaller angle of the secondary sealing angle A2 preferentially contacts the ball 22 under low pressure, providing a pre-tightening seal and preventing low-pressure leakage. When the first valve seat 12 wears under long-term high pressure, the second valve seat 13 can gradually take over the load, extending the service life of the ball valve 100. When the joint 10 is under high pressure, the thrust of the medium causes the ball 22 to deflect towards the first valve seat 12, activating the main sealing band formed by the first valve seat 12. When the joint 10 is under low pressure or reverse pressure, the second valve seat 13 maintains contact with the ball 22, preventing water hammer effect from causing seal failure within the joint 10. Furthermore, the smaller angle A2 of the second valve seat 13 can further reduce the initial friction area of ​​the ball 22 during rotation.

[0040] Better yet, satisfy the relation:

[0041] 15°≤A1≤20°.

[0042] Among them, a slope angle of 15° to 20° can produce an excellent wedge sealing effect. When the medium pressure is applied, the ball 22 is pushed towards the valve seat. According to mechanical decomposition, this angle range can achieve a good ratio between the normal sealing force and the tangential force, ensuring sufficient sealing pressure while avoiding excessive friction torque. When A1 is less than 15°, the excessive sealing pressure can easily lead to plastic deformation of the valve seat, while when A1 is greater than 20°, the sealing force is insufficient, and the ball valve 100 is prone to leakage under high pressure.

[0043] Better yet, satisfy the relation:

[0044] 5°≤A2≤8°.

[0045] The 5° to 8° angle design allows for initial sealing using only bolt preload, meeting the zero-pressure sealing requirements of industry standards such as API 598 for low-pressure testing. When A2 is less than 5°, the contact area between the ball 22 and the valve seat is too small, making it susceptible to damage from particulate-laden flowing media. When A2 is greater than 8°, the preload torque needs to be increased.

[0046] More preferably, the material of the first sealing layer 11A is any one or a combination of graphite, corrugated metal sheet, aramid fiber reinforced rubber, stainless steel and nickel-based alloy.

[0047] When graphite is used as the core material of the first sealing layer 11A, it possesses high-temperature self-lubrication and anisotropic thermal expansion. Its layered crystalline structure can fill microscopic defects in the valve seat and maintain elastic deformation capacity under certain pressure, making it suitable for applications such as high-temperature steam valves. However, it requires a metal skeleton to prevent high-pressure extrusion. Metal bellows commonly use 316L alloy or Hastelloy alloy, which achieves dynamic compensation through the corrugated geometry energy storage effect, resisting some ultra-high pressure conditions. Aramid fibers are typically embedded in a fluororubber matrix in an orthogonal weave pattern, forming a directional tear-resistant structure. Its damping characteristics can absorb pipeline vibration energy and prevent fretting wear on the sealing surface. Stainless steel, as a common metal matrix for the first sealing layer 11A, can withstand pitting corrosion in seawater after laser cladding. Furthermore, the rigidity of stainless steel can limit the cold flow deformation of soft layers such as polytetrachloroethylene. Nickel-based alloys exhibit excellent performance in sulfur-containing oil and gas conditions; their strength at high temperatures far exceeds that of stainless steel, and they are corrosion-resistant.

[0048] More preferably, the material of the second sealing layer 11B is any one or a combination of polytetrachloroethylene, polyetheretherketone, perfluoroether rubber, ultra-high molecular weight polyethylene, silicon carbide and nickel alloy.

[0049] Among them, polytetrachloroethylene (PTFE) possesses excellent chemical inertness and can withstand most chemical media. Furthermore, PTFE has a low coefficient of friction, significantly reducing the rotational torque of the ball valve, making it suitable for chemical acid and alkali valves. Polyetheretherketone (PEEK) performs exceptionally well in high-temperature, high-pressure steam conditions, but its cost is higher, and its resistance to some strong acids is limited. Perfluoroelastomer (PFE), as the most broadly resistant chemical elastomer, resists a wide variety of chemicals. Its chemically cross-linked structure maintains elasticity at high temperatures. Ultra-high molecular weight polyethylene (UHMWPE) has the highest abrasion resistance of all plastics. Silicon carbide exhibits excellent hardness and resistance to particle erosion, and its high thermal conductivity allows for rapid dissipation of frictional heat, preventing thermal deformation of the sealing surface.

[0050] More preferably, the connector 10 further includes a first connector 1410 located at one end of the first direction F1 and a second connector 1510 located at the other end of the first direction F1. The sealing gasket 11 also extends integrally along the first direction F1, and the first sealing layer 11A is fixedly connected to the first connector 1410 and the second connector 1510 respectively.

[0051] The design incorporates a seamless sealing interface by integrally extending the gasket 11 along the fluid flow path and fixing it to the first connector 1410 and the second connector 1510. This design essentially eliminates flange leakage paths, as traditional split gaskets 11 may have assembly gaps at the connector 10 connection, while the integrated design completely seals off this leakage path. Furthermore, this design achieves closed-loop force flow transmission, where the sealing pressure travels from the first connector 1410 to the gasket 11, and finally to the second connector 1510, forming a closed loop and preventing localized stress concentration. The medium pressure drives the gasket 11 to expand radially, causing an interference fit between the first sealing layer 11A and the inner wall of the connector 10; the higher the pressure, the tighter the seal.

[0052] More preferably, a through hole 22A is integrally formed on the sphere 22, and the connector 10 extends along the first direction F1 to form a pipe 16. The through hole 22A and the pipe 16 have the same cross-sectional dimensions.

[0053] This design ensures a precise match between the shape and size of the through-hole 22A of the ball 22 and the pipe 16 of the connector 10. This results in a continuous flow channel without abrupt changes when the valve is fully open, with the through-hole 22A perfectly aligned with the pipe 16. This minimizes the flow resistance coefficient and significantly reduces turbulence and pressure loss. Simultaneously, the geometric consistency ensures that solid particles in the medium can pass smoothly without stagnation. Furthermore, the precisely matched dimensions reduce shear disturbances during the rotation of the ball 22, decrease operating torque, and extend the service life of the sealing system.

[0054] More preferably, when the handle 20 is rotated circumferentially along the second direction F2, the valve stem 21 drives the ball 22 to rotate. If the through hole 22A coincides or partially coincides with the projection of the pipeline 16 in the first direction F1, the medium enters the second connector 1510 through the first connector 1410.

[0055] When the handle 20 rotates circumferentially along the second direction F2, the valve stem 21 drives the ball 22 to rotate. Through the principle of geometric projection matching (the medium can flow when the projection overlap between the through hole 22A and the pipe 16 in the first direction F1 is greater than a certain degree), the flow rate can be precisely controlled, while ensuring that the flow channel is nearly unobstructed with zero resistance in the fully open state. The partial overlap state (such as 30% projection overlap) creates a throttling effect, which can not only meet the needs of fine adjustment of process flow rate, but also avoid the high-speed erosion damage caused by small opening of traditional gate valves. In addition, this structure automatically optimizes the contact stress distribution between the ball 22 and the valve seat through the dynamic change of the projection overlap during the opening and closing process, which significantly improves the reliability of the valve under frequent adjustment conditions.

[0056] More preferably, the ball valve 100 further includes a valve body 30 and a packing gasket 40.

[0057] The valve body 30 is fixedly connected to the connector 10 and is located on the side of the connector 10 where the first valve seat 12 is located. The packing gasket 40 abuts against the valve body 30 and is located between the valve body 30 and the packing rod.

[0058] This design constructs a multi-layered sealing and protection system through the coordinated positioning of the valve body 30 and the packing gasket 40. The valve body 30 is fixed to the connector 10 and covers the side of the first valve seat 12, forming the main pressure boundary, which can withstand the maximum working pressure of the pipeline system. The packing gasket 40, as a stress transition component between the valve body 30 and the valve stem 21, uses its high-hardness material to evenly distribute the bolt preload and prevent plastic deformation of the sealing surface of the valve body 30.

[0059] More preferably, the ball valve 100 further includes a packing gland 50.

[0060] The packing gland 50 is fixedly connected between the valve stem 21 and the valve body 30. The space between the packing gland 50 and the packing pad 40 is filled with packing to prevent the medium in the pipeline 16 from entering the handle 20.

[0061] This design optimizes the dynamic sealing system through precise positioning and mechanical control of the packing gland 50. The packing gland 50 is fixed to the valve body 30 with flange bolts, applying constant axial pressure to the packing layer. This causes the graphite or PTFE packing to expand radially and tightly adhere to the valve stem 21, completely preventing the risk of media seeping through the valve stem 21 to the handle 20. The precise fit between the packing gland 50 and the valve stem 21 also provides a guiding function, ensuring the concentricity of the valve stem 21's rotation and reducing operating torque. Furthermore, the closed cavity structure formed by the packing gland 50 and the packing gasket 40 not only prevents the packing from being eroded by the media but also integrates pressure balancing holes to eliminate packing creep caused by pressure differentials, ensuring stable sealing performance of the valve even under extreme operating conditions.

[0062] By incorporating a first valve seat 12 and a second valve seat 13, with the first and second valve seats 12 and 13 designed to form an angle between their inclined surfaces and the first direction F1 extending from the connector 10, the contact area between the ball 22 and the connector 10 is increased, as is the pre-tightening force exerted by the connector 10 on the ball 22 in the first direction F1. Furthermore, the design employs different angles between the first and second valve seats 12 and the first direction F1, with A1 being greater than A2. This design allows the first valve seat 12 to seal the ball 22 under high-pressure conditions, and the second valve seat 13 to pre-tighten and seal the ball 22 under lower-pressure conditions, preventing sudden stress changes on the contact surface during high-low pressure transitions and effectively mitigating valve seat wear. The sealing gasket 11 is designed as a double-layer structure consisting of a first sealing layer 11A and a second sealing layer 11B. The second sealing gasket 11 contacts the flowing medium within the connector 10, while the first sealing gasket 11 is located between the second sealing gasket 11 and the connector 10, enhancing the corrosion resistance of the sealing layer and effectively preventing media leakage.

[0063] The embodiments described above are merely examples of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. A straight-through two-way ball valve, characterized in that, The ball valve includes: The connector extends in a first direction, and a sealing gasket is fixedly connected around the connector. A first valve seat that abuts against one side of the sealing gasket and a second valve seat that abuts against the other side of the sealing gasket are also fixedly connected. A handle is fixedly connected to the connector, and a valve stem extending in a second direction perpendicular to the first direction and a ball fixedly connected to one end of the valve stem are fixedly connected inside the handle. The sealing gasket includes a first sealing layer fixedly connected to the joint, and a second sealing layer fixedly connected to the first sealing layer and located on the side of the first sealing layer away from the joint. The ball abuts against the first valve seat and the second valve seat. The angle between the first valve seat and the first direction is denoted as A1, and the angle between the second valve seat and the first direction is denoted as A2, and the relationship is satisfied: A1 > A2.

2. A straight-through two-way ball valve according to claim 1, characterized in that, Satisfying the relation: 15°≤A1≤20°。 3. A straight-through two-way ball valve according to claim 1, characterized in that, Satisfying the relation: 5°≤A2≤8°。 4. A straight-through two-way ball valve according to claim 1, characterized in that, The first sealing layer is made of any one or a combination of graphite, corrugated metal sheet, aramid fiber reinforced rubber, stainless steel and nickel-based alloy.

5. A straight-through two-way ball valve according to claim 1, characterized in that, The material of the second sealing layer is any one or a combination of polytetrachloroethylene, polyetheretherketone, perfluoroether rubber, ultra-high molecular weight polyethylene, silicon carbide and nickel alloy.

6. A straight-through two-way ball valve according to claim 1, characterized in that, The connector also includes a first connector located at one end of the first direction and a second connector located at the other end of the first direction. The sealing gasket is integrally formed along the first direction, and the first sealing layer is fixedly connected to the first connector and the second connector respectively.

7. A straight-through two-way ball valve according to claim 6, characterized in that, A through hole is integrally formed on the sphere, and the connector extends along the first direction to form a pipeline; The through hole has the same cross-sectional dimensions as the pipeline.

8. A straight-through two-way ball valve according to claim 7, characterized in that, Rotating the handle circumferentially along the second direction causes the valve stem to drive the ball to rotate. If the through hole coincides or partially coincides with the projection of the pipeline in the first direction, the medium enters the second connector through the first connector.

9. A straight-through two-way ball valve according to claim 8, characterized in that, The ball valve also includes: The valve body is fixedly connected to the connector and is located on the side of the connector where the first valve seat is located; A packing gasket abuts against the valve body and is located between the valve body and the packing rod.

10. A straight-through two-way ball valve according to claim 9, characterized in that, The ball valve also includes: A packing gland is fixedly connected between the valve stem and the valve body; The space between the packing gland and the packing pad is filled with packing material to prevent the medium in the pipeline from entering the handle.

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