A throttle valve

Abstract

The application belongs to the technical field of valves, and discloses a throttle valve, which comprises a valve body, a cylinder body, a piston, a valve rod, a valve core, an elastic element and a valve seat assembly, the cylinder body is threadedly connected with the valve body, the valve seat assembly is arranged in the valve body, the piston is movably arranged in the cylinder body, the upper end of the valve rod is fixedly connected with the piston, the lower end of the valve rod is fixedly connected with the valve core, the valve core is used for sealingly cooperating with the valve seat assembly, and the elastic element is arranged between the piston and the valve body; the cylinder body is provided with an inlet hole and an outlet hole, and both of them are located above the piston. The throttle valve is directly threadedly connected with the valve body, the bonnet and the stud bolt connection structure are cancelled, the vertical height of the throttle valve is reduced, the compactness of the throttle valve can be improved, the space occupation of the manifold and the weight of the throttle valve are reduced, and the production manufacturing cost is reduced; and the cylinder body can be quickly disassembled and assembled through rotation, the internal accessories can be conveniently replaced, the disassembly and assembly efficiency of the throttle valve and the maintenance convenience can be effectively improved, and the equipment operation and maintenance cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and more particularly to a throttle valve. Background Technology

[0002] The choke valve is the core pressure regulating component of the choke and kill manifold. It primarily maintains stable bottomhole pressure balance by precisely controlling the flow rate of drilling fluid, making it a critical piece of equipment for preventing well kicks and blowouts in oil and gas drilling well control operations. Conventional choke valves generally use a fixed structure where the valve body and valve cover are bolted together with studs. This traditional structure has several technical drawbacks:

[0003] Firstly, the stud-connected structure has a large overall volume and occupies a lot of installation space. Throttling valves under high-pressure conditions need to be matched with high-strength, large-specification fasteners, resulting in a large valve body weight and a significant increase in manufacturing costs. This makes it difficult to adapt to space-constrained operating scenarios such as offshore platforms and compact drilling modules, resulting in poor equipment adaptability.

[0004] Secondly, equipment maintenance is cumbersome and extremely inefficient. Replacing easily damaged parts such as conventional valve cores and seals requires disassembling all studs and nuts one by one and removing the entire valve cover, a complicated and time-consuming process. This is especially true for hydraulic throttle valves, where springs, pistons, and other components are encapsulated in a sealed cavity between the valve cover and the valve body. Disassembling the valve cover will cause the internal pressure structure to fail and the sealing system to be damaged, making it impossible to replace parts individually. Once a malfunction occurs, the entire machine must be disassembled or even the entire valve replaced, significantly increasing maintenance costs and equipment downtime, and seriously affecting well control operation efficiency and construction safety.

[0005] Therefore, there is an urgent need to develop a throttling valve to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to solve or at least alleviate some or all of the aforementioned problems. Therefore, the purpose of this invention is to provide a throttle valve that improves the structural compactness of the throttle valve, reduces manifold space occupation, reduces the weight of the throttle valve, and lowers manufacturing costs; at the same time, it improves the efficiency of throttle valve assembly and disassembly and the convenience of maintenance, thereby reducing equipment operation and maintenance costs.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A throttle valve includes a valve body, a cylinder, a piston, a valve stem, a valve core, an elastic element, and a valve seat assembly. The cylinder is threadedly fitted to the valve body. The valve seat assembly is disposed within the valve body. The piston is movably disposed within the cylinder. The upper end of the valve stem is fixedly connected to the piston, and the lower end of the valve stem is fixedly connected to the valve core. The valve core is used for a sealing fit with the valve seat assembly. The elastic element is disposed between the piston and the valve body to give the piston a tendency to move away from the valve seat assembly. The cylinder has an inlet port and an outlet port, both located above the piston.

[0009] In some alternative embodiments, the throttle valve further includes a locking element circumferentially positioned between the valve body and the cylinder body; and / or,

[0010] A sealing ring is sandwiched between the cylinder body and the valve body.

[0011] In some alternative embodiments, the locking element includes a set screw, and one of the cylinder body and the valve body has a threaded hole, the set screw being threaded into the threaded hole and radially abutting against the other of the cylinder body and the valve body.

[0012] In some alternative embodiments, the throttle valve further includes a mounting base disposed below the piston for supporting the elastic element, and the mounting base is configured to abut against the piston to limit the travel of the piston toward the valve seat assembly.

[0013] In some alternative embodiments, the throttle valve further includes an adjusting shim disposed on top of the mounting base for engaging with the piston at a limiting position.

[0014] In some optional embodiments, the throttle valve further includes a displacement sensor, a displacement indicator, and a connector. The displacement sensor is mounted on the top of the cylinder body, and the top of the cylinder body also has a through mounting hole. The connector is slidably sealed to the mounting hole. The displacement indicator is connected to the connector. The displacement sensor is used to detect the position of the displacement indicator; and / or,

[0015] The cylinder sidewall is also provided with an indicator plate corresponding to the piston position. The indicator plate is provided with multiple opening degree marks and observation windows corresponding to the opening degree marks. The piston outer wall is provided with a visible mark, which can indicate the current opening degree through the observation window.

[0016] In some optional embodiments, the valve core has a recessed mounting groove at the top, the valve stem includes a connected rod portion and a connecting portion, the rod portion is connected to the piston, the connecting portion is adapted to the shape of the mounting groove, and the connecting portion is provided with external threads for thread engagement with the inner wall of the mounting groove, the rod portion and the connecting portion have a positioning stepped surface, and the groove end face of the mounting groove is welded and fixed to the positioning stepped surface.

[0017] In some optional embodiments, the valve core has a first conical sealing surface, and the valve seat assembly has a second conical sealing surface for sealing engagement with the first conical sealing surface, wherein the cone angle β of the second conical sealing surface is greater than the cone angle α of the first conical sealing surface.

[0018] In some alternative embodiments, the valve seat assembly includes a throttling core and a bushing, the throttling core being used for a sealing engagement with the valve core, the bushing being sleeved outside the throttling core and having an interference fit with the throttling core, and the bushing having a threaded engagement with the inner wall of the valve body.

[0019] In some optional embodiments, both the valve core and the throttling core are made of hard alloy; and / or,

[0020] The top of the bushing is provided with at least two L-shaped slots spaced apart circumferentially.

[0021] The beneficial effects of this invention are:

[0022] This invention provides a throttle valve, comprising a valve body, a cylinder, a piston, a valve stem, a valve core, an elastic element, and a valve seat assembly. The cylinder is threadedly fitted to the valve body, the valve seat assembly is disposed within the valve body, the piston is movably disposed within the cylinder, the upper end of the valve stem is fixedly connected to the piston, and the lower end of the valve stem is fixedly connected to the valve core. The valve core is used for a sealing fit with the valve seat assembly. The elastic element is disposed between the piston and the valve body to give the piston a tendency to move away from the valve seat assembly. The cylinder has an inlet hole and an outlet hole, both located above the piston.

[0023] The working principle of this throttle valve is as follows: Hydraulic oil is injected into the cylinder through the inlet port. The hydraulic oil acts on the piston, driving the piston downward to compress the elastic element. The piston moves the valve stem and valve core closer to the valve seat assembly, reducing the flow gap between the valve core and the valve seat assembly, thereby reducing the throttle valve opening until the valve core and valve seat assembly are in sealed contact, putting the throttle valve in the closed state. After pressure is released through the outlet port, the restoring force of the elastic element drives the piston upward. The piston moves the valve stem and valve core away from the valve seat assembly, increasing the flow gap between the valve core and the valve seat assembly, thereby increasing the throttle valve opening. By adjusting the amount of hydraulic oil injected, the valve core stroke can be flexibly controlled, thereby regulating the flow rate of the throttle valve.

[0024] This throttle valve directly connects the cylinder body to the valve body via a threaded connection, eliminating the need for a valve cover and stud bolts. This significantly reduces the vertical height of the throttle valve, improving its structural compactness, reducing manifold space requirements, and decreasing its weight, thereby lowering manufacturing costs. Furthermore, rotating the cylinder body allows for quick disassembly and assembly, facilitating the replacement of internal components such as the piston, elastic element, valve core, and valve seat assembly. This effectively improves the efficiency of throttle valve assembly and disassembly, enhances maintenance convenience, and reduces equipment operation and maintenance costs. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the throttle valve described in an embodiment of the present invention;

[0027] Figure 2 This is a cross-sectional view of the throttle valve described in an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of the sign described in an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the valve stem and valve core according to an embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of the valve seat assembly described in an embodiment of the present invention.

[0031] In the picture:

[0032] 1. Valve body; 2. Cylinder body; 21. Inlet port; 22. Outlet port; 3. Piston; 4. Valve stem; 41. Stem; 42. Connecting part; 421. External thread; 43. Positioning stepped surface; 5. Valve core; 51. First conical sealing surface; 6. Elastic element; 7. Valve seat assembly; 71. Second conical sealing surface; 72. Throttling core; 73. Bushing; 731. L-shaped groove; 8. Sealing ring; 9. Set screw; 10. Threaded hole; 11. Mounting seat; 12. Adjusting shim; 13. Displacement sensor; 14. Displacement indicator; 15. Connecting part; 16. Indicator plate; 17. Opening degree mark; 18. Observation window; 19. Stroke scale. Detailed Implementation

[0033] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0034] In this invention, the terms "comprising," "including," "having," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0035] In this invention, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following related objects have an "and / or" relationship.

[0036] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," "fixed," "combined," "coupled," and "installed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a direct connection or an indirect connection via an intermediate medium; or the internal communication of two components or the interaction between two components. As examples, a direct connection refers to two parts or components being connected together without the need for an intermediate medium, while an indirect connection refers to two parts or components each being connected to at least one intermediate medium, with the connection achieved through the intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Furthermore, "connected" and "coupled" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0037] In this invention, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the value and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​not using relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0038] In this invention, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0039] In this invention, the terms "upper," "lower," "left," "right," "front," and "rear," etc., refer to the orientations or positional relationships shown in the accompanying drawings. They are used solely for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, in the context, it should be understood that when an element is mentioned as being "upper" or "lower" than another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as "upper side," "lower side," "left side," "right side," "front side," and "rear side" not only represent positive orientation but can also be understood as lateral orientation. For example, "above," "on top of," "upper side of," and "above" the first feature "above" or "on the second feature" includes the first feature being directly above, to the upper left, to the upper right, to the upper front, and to the upper rear of the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature. The terms "below," "under," "below," and "below" for "first feature" and "second feature" include situations where the first feature is directly below, to the lower left, to the lower right, in front of, or behind the second feature, or simply indicate that the first feature is at a lower horizontal level than the second feature. Furthermore, the terms "first" and "second" are used merely for descriptive distinction and have no specific meaning.

[0040] like Figures 1-5As shown, this embodiment provides a throttle valve, including a valve body 1, a cylinder 2, a piston 3, a valve stem 4, a valve core 5, an elastic element 6, and a valve seat assembly 7. The cylinder 2 is threadedly fitted to the valve body 1. The valve seat assembly 7 is disposed inside the valve body 1. The piston 3 is movably disposed inside the cylinder 2. The upper end of the valve stem 4 is fixedly connected to the piston 3, and the lower end of the valve stem 4 is fixedly connected to the valve core 5. The valve core 5 is used for sealing cooperation with the valve seat assembly 7. The elastic element 6 is disposed between the piston 3 and the valve body 1 to make the piston 3 tend to move away from the valve seat assembly 7. The cylinder 2 is provided with an inlet hole 21 and an outlet hole 22, both of which are located above the piston 3.

[0041] The working principle of this throttle valve is as follows: Hydraulic oil is injected into the cylinder 2 through the inlet port 21. The hydraulic oil acts on the piston 3, driving the piston 3 to compress the elastic element 6 downwards. The piston 3 drives the valve stem 4 and valve core 5 closer to the valve seat assembly 7, reducing the flow gap between the valve core 5 and the valve seat assembly 7, thereby reducing the opening of the throttle valve until the valve core 5 and the valve seat assembly 7 are in sealing contact, so that the throttle valve is in the closed state. After the pressure is released through the outlet port 22, the restoring force of the elastic element 6 drives the piston 3 to move upwards, moving the valve stem 4 and valve core 5 away from the valve seat assembly 7, thereby increasing the flow gap between the valve core 5 and the valve seat assembly 7, thereby increasing the opening of the throttle valve. By adjusting the amount of hydraulic oil injected, the stroke of the valve core 5 can be flexibly controlled, thereby adjusting the flow rate of the throttle valve.

[0042] The throttle valve provided in this embodiment directly threadedly engages the cylinder body 2 with the valve body 1, eliminating the need for a valve cover and stud bolt connection. This significantly reduces the vertical height of the throttle valve, improving its structural compactness, reducing manifold space occupation, and decreasing its weight, thereby lowering manufacturing costs. Furthermore, rotating the cylinder body 2 allows for quick disassembly and assembly, facilitating the replacement of internal components such as the piston 3, elastic element 6, valve core 5, and valve seat assembly 7. This effectively improves the efficiency of throttle valve disassembly and assembly, enhances maintenance convenience, and reduces equipment operation and maintenance costs.

[0043] In some optional embodiments, the throttle valve further includes a locking element, which is circumferentially limited and connected between the valve body 1 and the cylinder 2 to achieve circumferential fixation of the valve body 1 and the cylinder 2, prevent the threaded fit between the two from loosening, and further improve the stability, reliability and sealing of the connection between the cylinder 2 and the valve body 1.

[0044] In this embodiment, the lower end of the cylinder 2 is inserted into the valve body 1. The locking component includes a set screw 9. A threaded hole 10 is provided on the valve body 1. The set screw 9 is threaded into the threaded hole 10 and abuts radially against the cylinder 2, thereby achieving circumferential locking between the cylinder 2 and the valve body 1. The set screw 9 has no protruding head structure and is completely embedded in the threaded hole 10 after locking, making the throttle valve structure more compact.

[0045] Furthermore, the number of set screws 9 is at least two, and the at least two set screws 9 are evenly spaced along the circumference of the valve body 1. The at least two set screws 9 together lock the cylinder body 2, which increases the circumferential frictional resistance torque of the threaded pair between the valve body 1 and the cylinder body 2, improves the circumferential force balance of the cylinder body 2, reduces the risk of thread loosening failure under vibration and impact conditions, and further enhances the circumferential anti-loosening reliability of the threaded connection between the valve body 1 and the cylinder body 2. Exemplarily, the number of set screws 9 can be two, three, four, or six, and is not limited here.

[0046] In other embodiments, the upper end of the valve body 1 can be inserted into the cylinder body 2. The cylinder body 2 has a threaded hole 10, and the set screw 9 is threaded into the threaded hole 10 and radially abuts against the valve body 1, which can also achieve circumferential locking between the cylinder body 2 and the valve body 1.

[0047] Optionally, the locking component may also include a locking block. The cylinder body 2 and the valve body 1 are respectively provided with locking slots. By inserting the locking block into the corresponding locking slots of the cylinder body 2 and the valve body 1 in sequence, the circumferential fixation of the cylinder body 2 and the valve body 1 can also be achieved.

[0048] In some optional embodiments, a sealing ring 8 is sandwiched between the cylinder body 2 and the valve body 1 to further improve the sealing performance between the cylinder body 2 and the valve body 1.

[0049] like Figure 2 As shown, in some optional embodiments, the throttle valve further includes a mounting seat 11, which is disposed below the piston 3 to support the elastic element 6. The mounting seat 11 is configured to abut against the piston 3 to limit the stroke of the piston 3 towards the valve seat assembly 7. This structure prevents excessive stroke of the piston 3 towards the valve seat assembly 7, thereby preventing excessive contact pressure between the valve core 5 and the sealing surface of the valve seat assembly 7, which could damage the valve core 5 or the valve seat assembly 7. This helps extend the service life of the valve core 5 and the valve seat assembly 7, ensuring stable sealing performance of the throttle valve.

[0050] In this embodiment, the elastic element 6 is a spring. Optionally, the elastic element 6 can also be an elastic rubber column or an elastic sleeve, without limitation.

[0051] Furthermore, the throttle valve also includes an adjusting shim 12, which is mounted on top of the mounting base 11 and used to limit and abut against the piston 3. By installing an adjusting shim 12 of appropriate thickness, the maximum stroke of the piston 3 moving towards the valve seat assembly 7 can be adjusted, thereby adjusting the minimum opening of the throttle valve to adapt to various operating requirements.

[0052] In some optional embodiments, the throttle valve further includes a displacement sensor 13, a displacement indicator 14, and a connector 15. The displacement sensor 13 is mounted on the top of the cylinder body 2, and a through mounting hole is also provided on the top of the cylinder body 2. The connector 15 is slidably sealed to the mounting hole. The displacement indicator 14 is connected to the connector 15. The displacement sensor 13 is used to detect the position of the displacement indicator 14, thereby detecting the opening degree of the throttle valve in real time and accurately, providing a basis for the precise adjustment of the throttle valve opening.

[0053] Specifically, the inlet port 21 is connected to the hydraulic pump, the outlet port 22 is connected to the pressure relief valve, and the displacement sensor 13 sends the position detection signal to the control unit. The control unit can precisely control the amount of hydraulic oil above the piston 3 by controlling the start and stop of the hydraulic pump and the pressure relief valve, thereby driving the piston 3 to move the valve core 5 closer to or away from the valve seat assembly 7, so as to achieve precise adjustment of the throttle valve opening.

[0054] like Figure 1 and Figure 3 As shown, in some optional embodiments, the side wall of the cylinder 2 is also provided with an indicator 16 corresponding to the position of the piston 3. The indicator 16 is provided with multiple opening degree marks 17 and observation windows 18 corresponding to the opening degree marks 17. The outer wall of the piston 3 is provided with a visible mark, which can indicate the current opening degree through the observation window 18. The operator can observe the visible mark through the observation window 18, and can intuitively observe the current opening degree of the throttle valve according to the opening degree mark 17 corresponding to the observation window 18 that exposes the visible mark.

[0055] In this embodiment, the visible marking is a yellow coating on the outer wall of the piston 3, which is bright in color and easy to observe. Optionally, the visible marking may also be a red coating, a blue coating, a groove or engraving on the outer wall of the piston 3, and is not limited here.

[0056] In some alternative embodiments, the indicator 16 is also provided with a stroke scale 19 for indicating the displacement stroke of the piston 3, and the opening mark 17 corresponds to the stroke scale 19.

[0057] like Figure 4As shown, in some optional embodiments, the valve core 5 has a recessed mounting groove at its top. The valve stem 4 includes a connected stem portion 41 and a connecting portion 42. The stem portion 41 is connected to the piston 3, and the connecting portion 42 is adapted to the shape of the mounting groove. The connecting portion 42 is provided with an external thread 421 for thread engagement with the inner wall of the mounting groove. A positioning stepped surface 43 is provided between the stem portion 41 and the connecting portion 42. The end face of the mounting groove is welded to the positioning stepped surface 43 for fixation. Through the assembly method of internal thread engagement and end face welding reinforcement, the valve stem 4 and valve core 5 are double-reinforced, significantly enhancing the connection strength between the valve stem 4 and valve core 5 and reducing the risk of valve core 5 falling off or breaking. When ice blockage occurs, ice forms on the sealing surface of the valve seat assembly 7. The piston 3 can drive the valve core 5 to move back and forth, repeatedly impacting the valve seat assembly 7, thereby removing the iced foreign matter from the sealing surface.

[0058] In some optional embodiments, the valve core 5 has a first conical sealing surface 51, and the valve seat assembly 7 has a second conical sealing surface 71 for sealing cooperation with the first conical sealing surface 51, wherein the cone angle β of the second conical sealing surface 71 is greater than the cone angle α of the first conical sealing surface 51. When the valve core 5 abuts against the valve seat assembly 7, the first sealing surface and the second sealing surface are pressed against each other to form a line seal structure, which can improve the sealing performance and achieve zero leakage under high pressure gas conditions.

[0059] In some optional embodiments, the valve seat assembly 7 includes a throttling core 72 and a bushing 73. The throttling core 72 is used for sealing with the valve core 5; that is, the second conical sealing surface 71 is disposed on the throttling core 72, and the bushing 73 is sleeved on the outside of the throttling core 72 with an interference fit. The bushing 73 is threadedly engaged with the inner wall of the valve body 1. This structure uses a heat-fitting process to assemble the throttling core 72 and the bushing 73, ensuring an interference fit between them. This helps guarantee the assembly reliability of the throttling core 72 and the bushing 73, improves the positional stability of the throttling core 72, and thus improves the alignment accuracy of the valve core 5-throttling core 72 sealing pair, enhances sealing performance, and reduces the risk of internal leakage. The bushing 73 is fixed to the inner wall of the valve body 1 by a threaded fit, making disassembly and assembly convenient. The throttling core 72 can be removed as a whole along with the bushing 73, facilitating later maintenance and replacement of the throttling core 72 without disassembling the main body of the valve body 1, reducing maintenance difficulty. Furthermore, the bushing 73 can protect the throttling core 72, preventing it from being squeezed and deformed by assembly stress, thus extending the service life of the throttling core 72. At the same time, it facilitates the selection of wear-resistant and corrosion-resistant materials for the throttling core 72 and the selection of easily machinable structural components for the bushing 73, thereby reducing the overall processing cost.

[0060] In this embodiment, both the valve core 5 and the throttling core 72 are made of hard alloy. Hard alloy has high hardness, good toughness, and is resistant to erosion and impact. When ice blockage occurs, the valve core 5 can repeatedly impact the sealing surface of the throttling core 72 to remove icy foreign objects.

[0061] For example, the cemented carbide can be YG8 or 718 alloy, and is not limited thereto.

[0062] like Figure 5 As shown, in some optional embodiments, the top of the bushing 73 is provided with at least two L-shaped slots 731 spaced apart circumferentially. Workers can use a disassembly tool to insert it through the vertical part of the L-shaped slot and rotate it to the horizontal part, thereby achieving a circumferential and axial limiting connection between the tool and the bushing 73. After unscrewing the bushing 73 by the disassembly tool to release the threaded fit between the bushing 73 and the inner wall of the valve body 1, the bushing 73 can be lifted upwards for easy removal, achieving quick disassembly and assembly of the bushing 73.

[0063] In this embodiment, there are four L-shaped slots 731. The four L-shaped slots 731 are evenly distributed around the bushing 73, which is compatible with the structure of the disassembly and assembly tool. This makes the bushing 73 subjected to balanced force around the bushing during disassembly and assembly, which is beneficial to improving the thread tightening efficiency and thus improving the disassembly and assembly efficiency of the valve seat assembly 7.

[0064] Alternatively, the number of L-shaped card slots 731 can be two or three, and there is no limitation on this.

[0065] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A throttle valve, characterized in that, The valve body includes a valve body (1), a cylinder (2), a piston (3), a valve stem (4), a valve core (5), an elastic element (6), and a valve seat assembly (7). The cylinder (2) is threadedly fitted to the valve body (1). The valve seat assembly (7) is disposed inside the valve body (1). The piston (3) is movably disposed inside the cylinder (2). The upper end of the valve stem (4) is fixedly connected to the piston (3), and the lower end of the valve stem (4) is fixedly connected to the valve core (5). The valve core (5) is used to seal with the valve seat assembly (7). The elastic element (6) is disposed between the piston (3) and the valve body (1) to make the piston (3) tend to move away from the valve seat assembly (7). The cylinder (2) has an inlet hole (21) and an outlet hole (22), both of which are located above the piston (3).

2. The throttle valve according to claim 1, characterized in that, The throttle valve further includes a locking element, which is circumferentially limited and connected between the valve body (1) and the cylinder body (2); and / or, A sealing ring (8) is sandwiched between the cylinder body (2) and the valve body (1).

3. The throttle valve according to claim 2, characterized in that, The locking component includes a set screw (9), and a threaded hole (10) is provided on one of the cylinder (2) and the valve body (1). The set screw (9) is threaded into the threaded hole (10) and radially abuts against the other of the cylinder (2) and the valve body (1).

4. The throttle valve according to claim 1, characterized in that, The throttle valve also includes a mounting base (11) disposed below the piston (3) for supporting the elastic element (6), and the mounting base (11) is configured to limit the piston (3) to move the piston (3) towards the valve seat assembly (7).

5. The throttle valve according to claim 4, characterized in that, The throttle valve also includes an adjusting shim (12), which is placed on top of the mounting base (11) and used to limit contact with the piston (3).

6. The throttle valve according to claim 1, characterized in that, The throttle valve also includes a displacement sensor (13), a displacement indicator (14), and a connector (15). The displacement sensor (13) is mounted on the top of the cylinder (2), and the top of the cylinder (2) also has a through mounting hole. The connector (15) is slidably sealed to the mounting hole. The displacement indicator (14) is connected to the connector (15). The displacement sensor (13) is used to detect the position of the displacement indicator (14); and / or, The side wall of the cylinder (2) is also provided with an indicator (16) corresponding to the position of the piston (3). The indicator (16) is provided with multiple opening marks (17) and observation windows (18) corresponding to the opening marks (17). The outer wall of the piston (3) is provided with a visible mark, which can indicate the current opening through the observation window (18).

7. The throttle valve according to claim 1, characterized in that, The valve core (5) has a recessed mounting groove at the top. The valve stem (4) includes a connected rod part (41) and a connecting part (42). The rod part (41) is connected to the piston (3). The connecting part (42) is adapted to the shape of the mounting groove. The connecting part (42) is provided with an external thread (421) for threading with the inner wall of the mounting groove. There is a positioning stepped surface (43) between the rod part (41) and the connecting part (42). The groove end face of the mounting groove is welded and fixed to the positioning stepped surface (43).

8. The throttle valve according to claim 1, characterized in that, The valve core (5) has a first conical sealing surface (51), and the valve seat assembly (7) has a second conical sealing surface (71) for sealing with the first conical sealing surface (51), wherein the cone angle β of the second conical sealing surface (71) is greater than the cone angle α of the first conical sealing surface (51).

9. The throttle valve according to any one of claims 1 to 8, characterized in that, The valve seat assembly (7) includes a throttling core (72) and a bushing (73). The throttling core (72) is used to seal with the valve core (5). The bushing (73) is sleeved on the outside of the throttling core (72) and is interference-fitted with the throttling core (72). The bushing (73) is threaded with the inner wall of the valve body (1).

10. The throttle valve according to claim 9, characterized in that, Both the valve core (5) and the throttling core (72) are made of hard alloy; and / or, The top of the bushing (73) is provided with at least two L-shaped slots (731) spaced apart circumferentially.

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