A needle valve with high linearity

Abstract

This utility model provides a flow rate adjustable needle valve with high linearity, relating to the field of needle valve technology. It includes a valve body with an internal flow channel, the flow channel being vertically oriented in the middle. A valve cover is threadedly connected to the top of the valve body, and a valve stem is disposed inside the valve cover. A sealing structure is provided at the bottom of the valve stem, and the sealing structure cooperates with the top of the flow channel. The surface of the valve stem is threadedly connected to the internal surface of the valve cover. A clamping nut is fitted onto the surface of the valve stem, and the interior of the clamping nut is threadedly connected to the top surface of the valve cover. This utility model, by incorporating a valve body, flow channel, valve cover, valve stem, sealing structure, clamping nut, and handwheel, solves the problem in existing needle valves where the sealing structure, due to contact with fluid, ages and leads to poor sealing, resulting in internal or external leakage, and is inconvenient to replace.

Description

Technical Field

[0001] This utility model relates to the field of needle valve technology, and in particular to a flow rate adjustable needle valve with high adjustment linearity. Background Technology

[0002] A needle valve is a type of valve that allows for precise adjustment. Its valve core is needle-shaped, a sharp, pointed cone that inserts into the valve seat like a needle, hence its name. This design minimizes the contact area between the valve core and the valve seat, thus enabling precise flow regulation. A needle valve mainly consists of a valve body, valve cover, valve stem, valve core, and valve seat. Its working principle involves rotating the valve stem to raise or lower the valve core, thereby changing the gap between the valve core and the valve seat, and ultimately controlling the flow rate of the medium. When the valve core moves downward, the gap with the valve seat decreases, increasing the resistance to fluid flow and decreasing the flow rate; conversely, when the valve core moves upward, the gap with the valve seat increases, decreasing the resistance to fluid flow and increasing the flow rate.

[0003] In existing technologies, needle valves are required for precise regulation of fluid flow. However, during use, the sealing structure of existing needle valves may become loose due to contact with the fluid and aging of the seals, leading to internal or external leakage. Furthermore, since the structure is a single unit, the entire valve needs to be replaced when small parts such as the seals wear out, resulting in wasted resources. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a flow rate adjustable needle valve with high linearity of adjustment, which facilitates the replacement of seals and allows for adjustment of the sealing position. This solves the problem that existing needle valves, during use, suffer from poor sealing due to contact with fluid and aging of seals, leading to internal or external leakage, and are inconvenient to replace.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a needle valve with high linearity and adjustable flow rate, comprising a valve body, wherein a flow channel is provided inside the valve body, the flow channel is vertically arranged in the middle, a valve cover is threadedly connected to the top of the valve body, a valve stem is provided inside the valve cover, and a sealing structure is provided at the bottom of the valve stem, the sealing structure being used in conjunction with the top of the flow channel;

[0006] The surface of the valve stem is connected to the internal thread of the valve cover;

[0007] A clamping nut is fitted onto the surface of the valve stem, and the inside of the clamping nut is threadedly connected to the top of the valve cover surface. A handwheel is fixedly connected to the top of the valve stem surface.

[0008] Furthermore, the sealing structure includes a conical sealing ring, the surface of which is in a vertical top sealing fit with the middle of the flow channel, and a fixing post is provided inside the conical sealing ring. A screw is fixedly connected to the top of the fixing post, and the top of the screw penetrates into the interior of the valve stem and is threadedly connected to the interior of the valve stem.

[0009] Furthermore, a screw is provided at the bottom of the conical sealing ring, the threaded end of the screw extends into the interior of the fixing post, the interior of the fixing post is provided with threads that cooperate with the screw, and the surface of the screw cooperates with the bottom of the conical sealing ring.

[0010] Furthermore, a hexagonal block is fixedly connected to the top of the surface of the fixed column, and a groove is provided on the top of the conical sealing ring to cooperate with the hexagonal block.

[0011] Furthermore, the surface of the screw is threaded with a threaded sleeve, and the top of the threaded sleeve contacts and engages with the bottom of the valve stem.

[0012] Furthermore, a gasket is provided between the valve body and the valve cover, and packing is provided between the valve cover and the valve stem, with the packing located at the bottom of the compression nut.

[0013] The beneficial effects of this utility model are:

[0014] 1. This utility model, by setting up a valve body, flow channel, valve cover, valve stem, sealing structure, clamping nut, and handwheel, features a flow channel with a vertical center, allowing fluid to change direction as it passes through the valve, meeting the fluid control requirements of specific pipeline systems. The valve cover is threaded to the valve body, facilitating disassembly and maintenance and improving valve maintainability. The valve stem is threaded to the valve cover, and its position can be easily adjusted by rotating the handwheel, thereby controlling the fit between the sealing structure and the top of the flow channel to open and close the fluid. The clamping nut further secures the valve stem, preventing it from loosening or falling off during use, ensuring the stability and reliability of the valve.

[0015] 2. This utility model effectively improves sealing performance and prevents fluid leakage by setting a sealing structure. The fixed post inside the conical sealing ring and the screw fixedly connected to it can firmly install the conical sealing ring on the valve stem. The screw is connected to the internal thread of the valve stem, realizing the removability and easy maintenance of the conical sealing ring, further improving the stability and service life of the structure, improving the sealing effect, and enhancing the stability and ease of maintenance of the structure.

[0016] 3. By incorporating screws, this utility model enhances the connection stability and sealing performance between the conical sealing ring and the fixed post. The threaded end of the screw penetrates into the interior of the fixed post and engages with the internal threads, achieving a secure connection between the conical sealing ring and the fixed post. This effectively prevents the conical sealing ring from loosening or falling off. The surface of the screw engages with the bottom of the conical sealing ring, further improving the sealing effect and ensuring that the conical sealing ring fits tightly against the required sealing position. This effectively prevents leakage of liquids or gases, thereby enhancing the reliability and safety of the overall structure.

[0017] 4. By setting a hexagonal block, the cooperation between the hexagonal block and the groove enhances the connection stability between the conical sealing ring and the fixed post, effectively preventing the conical sealing ring from loosening or falling off during use, and playing a limiting role for the conical sealing ring.

[0018] 5. By setting a screw sleeve, this utility model can enhance the stability and sealing of the structure. The threaded connection allows the screw sleeve to be firmly fixed on the screw rod, which is not easy to loosen and ensures the stability of the overall structure. The tight contact between the top of the screw sleeve and the bottom of the valve rod can fix the position of the screw rod, making it convenient for the valve rod to drive the screw rod to rotate and move.

[0019] 6. By setting gaskets and packing, this utility model can effectively prevent media leakage, improve the sealing performance of the valve, and the packing can also effectively reduce the friction between the valve stem and the valve cover, extend the service life of the valve, and ensure the flexibility of the valve stem movement. Attached Figure Description

[0020] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a 3D view of the valve stem;

[0023] Figure 3 This is an exploded view of the valve stem and sealing structure.

[0024] In the diagram: 1. Valve body; 2. Flow passage; 3. Valve cover; 4. Valve stem; 5. Compression nut; 6. Handwheel; 7. Conical sealing ring; 8. Fixing post; 9. Screw; 10. Screw; 11. Hexagonal block; 12. Screw sleeve; 13. Gasket; 14. Packing. Detailed Implementation

[0025] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0026] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of this utility model.

[0027] A flow rate adjustable needle valve with high linearity includes a valve body, an internal flow channel with a vertical center, a valve cover threaded to the top of the valve body, a valve stem inside the valve cover, and a sealing structure at the bottom of the valve stem, the sealing structure cooperating with the top of the flow channel.

[0028] The valve stem surface is connected to the internal thread of the valve cover;

[0029] A clamping nut is fitted onto the surface of the valve stem, and the inside of the clamping nut is threadedly connected to the top of the valve cover surface. A handwheel is fixedly connected to the top of the valve stem surface.

[0030] Please see Figure 2 and Figure 3 , Figure 2 This is a 3D view of the valve stem; Figure 3 This is an exploded view of the valve stem and sealing structure.

[0031] The sealing structure includes a conical sealing ring. The surface of the conical sealing ring forms a vertical top-sealing fit with the center of the flow channel. A fixing post is installed inside the conical sealing ring, and a screw is fixedly connected to the top of the fixing post. The top of the screw penetrates into the valve stem and connects with the internal threads of the valve stem, effectively improving sealing performance and preventing fluid leakage. The fixing post inside the conical sealing ring and the screw fixedly connected to it can firmly install the conical sealing ring on the valve stem. The connection between the screw and the internal threads of the valve stem enables the conical sealing ring to be disassembled and easily maintained, further improving the stability and service life of the structure, enhancing the sealing effect, and strengthening the structural stability and maintainability.

[0032] A screw is located at the bottom of the conical sealing ring, with its threaded end penetrating into the interior of the fixing post. The fixing post has internal threads that mate with the screw. The surface of the screw engages with the bottom of the conical sealing ring, enhancing the connection stability and sealing performance between the conical sealing ring and the fixing post. The threaded end of the screw, penetrating into the interior of the fixing post and engaging with the internal threads, ensures a secure connection between the conical sealing ring and the fixing post, effectively preventing the conical sealing ring from loosening or falling off. The engagement of the screw surface with the bottom of the conical sealing ring further improves the sealing effect, ensuring that the conical sealing ring fits tightly against the required sealing location, effectively preventing liquid or gas leakage, thereby enhancing the overall reliability and safety of the structure.

[0033] A hexagonal block is fixedly connected to the top of the fixed column surface. The top of the conical sealing ring has a groove that cooperates with the hexagonal block. The cooperation between the hexagonal block and the groove enhances the connection stability between the conical sealing ring and the fixed column, effectively preventing the conical sealing ring from loosening or falling off during use, and playing a limiting role for the conical sealing ring.

[0034] The screw has a threaded connection with a threaded sleeve. The top of the threaded sleeve contacts and fits with the bottom of the valve stem, which can enhance the stability and sealing of the structure. The threaded connection allows the threaded sleeve to be firmly fixed on the screw, making it less prone to loosening and ensuring the stability of the overall structure. The tight contact between the top of the threaded sleeve and the bottom of the valve stem can fix the position of the screw, making it convenient for the valve stem to drive the screw to rotate and move.

[0035] A gasket is installed between the valve body and the valve cover, and packing is installed between the valve cover and the valve stem. The packing is located at the bottom of the compression nut, which can effectively prevent media leakage, improve the valve's sealing performance, and also effectively reduce the friction between the valve stem and the valve cover, extend the valve's service life, and ensure the flexibility of the valve stem's movement.

[0036] Working Principle: When it is necessary to adjust the flow or shut-off of fluid, the handwheel is turned, which drives the valve stem to rotate. The surface of the valve stem is threadedly connected to the inside of the valve cover. Therefore, rotating the valve stem causes it to move up and down inside the valve cover. A sealing structure is provided at the bottom of the valve stem, including a conical sealing ring. The conical sealing ring is vertically sealed to the top of the flow channel. When the valve stem moves up and down, the conical sealing ring moves accordingly, thereby changing its position in the flow channel and realizing the control of fluid flow or flow regulation. The conical sealing ring is firmly installed on the valve stem by a fixing post and a screw. The screw is connected to the internal thread of the valve stem, making it detachable and easy to maintain. The hexagonal block on the surface of the fixing post cooperates with the groove on the top of the conical sealing ring, enhancing the connection stability between the conical sealing ring and the fixing post and effectively preventing the conical sealing ring from loosening or falling off during use. A screw is provided at the bottom of the conical sealing ring. The threaded end of the screw penetrates into the inside of the fixing post and cooperates with the internal thread of the fixing post, realizing a firm connection between the conical sealing ring and the fixing post and further improving the sealing effect. The threaded sleeve enhances structural stability and sealing. The tight contact between the top of the threaded sleeve and the bottom of the valve stem fixes the position of the screw, ensuring stable rotation and movement of the valve stem. A gasket is placed between the valve body and the valve cover, and packing is placed between the valve cover and the valve stem, with the packing located at the bottom of the compression nut. The gasket and packing effectively prevent media leakage and improve the valve's sealing performance. Simultaneously, the packing effectively reduces friction between the valve stem and the valve cover, extending the valve's service life and ensuring flexible valve stem movement.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0038] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A linearly adjustable needle valve having high linearity, characterized by: Includes a valve body (1), the valve body (1) has a flow channel (2) inside, the flow channel (2) is vertically arranged in the middle, the top of the valve body (1) is threadedly connected to a valve cover (3), the valve cover (3) has a valve stem (4) inside, the bottom of the valve stem (4) has a sealing structure, the sealing structure is used in conjunction with the top of the flow channel (2); The surface of the valve stem (4) is threadedly connected to the inside of the valve cover (3); A clamping nut (5) is fitted on the surface of the valve stem (4). The inside of the clamping nut (5) is threaded to the top of the valve cover (3). A handwheel (6) is fixedly connected to the top of the surface of the valve stem (4).

2. The needle valve according to claim 1, wherein: The sealing structure includes a conical sealing ring (7), the surface of which is vertically sealed to the middle of the flow channel (2), and a fixing post (8) is provided inside the conical sealing ring (7). A screw (9) is fixedly connected to the top of the fixing post (8), and the top of the screw (9) extends through the valve stem (4) and is threadedly connected to the inside of the valve stem (4).

3. The needle valve according to claim 2, wherein: The bottom of the conical sealing ring (7) is provided with a screw (10), the threaded end of the screw (10) extends into the interior of the fixing post (8), the interior of the fixing post (8) is provided with a thread that works with the screw (10), and the surface of the screw (10) works with the bottom of the conical sealing ring (7).

4. The needle valve according to claim 2, wherein: A hexagonal block (11) is fixedly connected to the top of the surface of the fixed column (8), and a groove is provided on the top of the conical sealing ring (7) to cooperate with the hexagonal block (11).

5. The needle valve according to claim 2, wherein: The screw (9) is threaded with a sleeve (12), and the top of the sleeve (12) is in contact with the bottom of the valve stem (4).

6. The needle valve of claim 1, wherein: A gasket (13) is provided between the valve body (1) and the valve cover (3), and a packing (14) is provided between the valve cover (3) and the valve stem (4), with the packing (14) located at the bottom of the clamping nut (5).

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