A globe valve with improved sealing

Abstract

This utility model discloses a gate valve with improved sealing performance. The gate valve includes a valve body with an inlet channel and an outlet channel at both ends. A valve seat is provided between the inlet and outlet channels, and a sealing element is fitted onto the inner wall of the valve seat. The inlet channel has a liftable valve disc located above the sealing element. A sealing portion extends from one end of the valve disc, and the outer wall of the sealing portion has an inclined contact surface that tightly abuts against the inner wall of the sealing element. By providing the contact surface, the sealing portion and the inner wall of the sealing element form a stable contact, maintaining a good fit during long-term opening and closing, preventing seal failure due to wear. After the contact surface is damaged, a spring applies an upward force to radially expand the sealing portion, enhancing the contact tightness, improving sealing performance and service life, effectively solving the problem of seal failure. The structure has self-adaptive compensation capabilities, improving operational stability and reliability.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a gate valve that improves sealing performance. Background Technology

[0002] A gate valve is a common type of valve used to cut off or connect fluid media in a pipeline, typically exhibiting unidirectional flow characteristics. Its main structure includes key components such as the valve body, valve disc, valve stem, valve seat, and stuffing box. The valve body, as the main structure of the valve, is responsible for constructing the fluid passage and connecting to the pipeline. The valve disc is the core component for achieving the sealing function, blocking fluid flow through its contact with the valve seat. The valve stem connects the valve disc to the drive components, transmitting operating force to control the movement of the valve disc. The stuffing box seals the gap between the valve stem and the valve body, preventing fluid leakage. The valve disc's opening height is adjustable, thereby controlling the fluid flow rate, making it suitable for applications requiring specific flow control.

[0003] In practical applications, gate valves typically close or open the fluid passage by rotating the valve stem to drive the sealing components. However, during long-term operation, the contact surface between the sealing components and the valve seat is prone to wear due to friction and erosion, resulting in unevenness on the sealing surface, which in turn affects the sealing performance and shortens the service life of the sealing components. This problem is particularly pronounced under conditions of frequent opening and closing or when the medium contains particulate matter. Therefore, the applicant has made beneficial designs and found a solution to the above problems. The technical solution described below arose in this context. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the traditional gate valve design and provide a product that improves sealing performance and extends service life.

[0005] To solve the above problems, the present invention adopts the following technical solution.

[0006] A shut-off valve for improving sealing performance includes a valve body with an inlet channel and an outlet channel at both ends. A valve seat is provided between the inlet channel and the outlet channel, and a sealing element is fitted on the inner wall of the valve seat. The inlet channel has a liftable valve disc located above the sealing element. A sealing part extends from one end of the valve disc. The outer wall of the sealing part has an inclined contact surface that abuts tightly against the inner wall of the sealing element. A liftable pressure plate is provided inside the sealing element and abuts against the inlet of the sealing element. A spring is also provided inside the sealing element and applies an upward force to the pressure plate, causing the sealing part to expand radially.

[0007] Preferably, the inlet of the seal is provided with a first inclined surface, and the valve disc is provided with a second inclined surface that abuts against the first inclined surface.

[0008] Preferably, one end of the valve disc is provided with a recessed groove, which is located on the same end face as the sealing part, and the other end of the valve disc is provided with a connecting part, and one side of the connecting part is provided with a relief groove.

[0009] Preferably, the valve body is provided with a valve cover, the valve cover is provided with a sealing sleeve and a connecting plate, the connecting plate is located above the sealing sleeve, the connecting plate is threadedly connected to a valve stem, the valve stem passes through the sealing sleeve and the connecting part, the end of the valve stem is provided with a backstop block and placed in a relief groove, and the valve stem is provided with an operating handwheel.

[0010] Preferably, one end of the seal is provided with a support plate, and a plurality of support portions are evenly distributed between the support plate and the seal along its circumference. The support plate is provided with a protruding post to prevent the spring from shifting, and reinforcing ribs are provided between the support portions and the seal, as well as between the support plate and the protruding post.

[0011] Preferably, the inlet of the sealing part is provided with an inclined expansion portion.

[0012] Preferably, the pressure plate has a third inclined surface corresponding to the expansion portion, and the pressure plate is slidably disposed on the protrusion.

[0013] Beneficial effects:

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This invention, by setting an inclined contact surface, establishes a stable contact relationship between the sealing part and the inner wall of the sealing element. During long-term opening and closing operations, the sealing part can still maintain a good fit with the sealing element, avoiding sealing failure due to accelerated wear of the contact surface. As the contact surface gradually becomes damaged during use, its diameter changes. By applying an upward force through a spring, the sealing part expands radially, thereby enhancing the contact tightness between it and the inner wall of the sealing element, further improving sealing performance, extending service life, and effectively solving the sealing failure problem in the prior art. Attached Figure Description

[0016] Figure 1 This is a side cross-sectional view of the gate valve for improving sealing performance according to the present invention when it is opened.

[0017] Figure 2 This utility model Figure 1 A partially enlarged view (A) of a shut-off valve designed to improve sealing performance;

[0018] Figure 3 This is a schematic diagram of the end cap structure of a gate valve for improving sealing performance when it is closed, according to the present invention.

[0019] Figure 4This utility model Figure 3 A partially enlarged view (B) of a shut-off valve designed to improve sealing performance;

[0020] Figure 5 This is a schematic diagram of the sealing element of a stop valve that improves sealing performance according to the present invention;

[0021] The correspondence between the labels and component names in the attached figures is as follows:

[0022] Reference numerals: 1. Valve body; 2. Seal; 3. Valve disc; 4. Pressure plate; 5. Spring; 6. Valve cover; 7. Sealing sleeve; 8. Connecting plate; 9. Valve stem; 11. Inlet channel; 12. Outlet channel; 13. Valve seat; 21. First inclined surface; 22. Support plate; 23. Support part; 24. Protruding column; 25. Reinforcing rib; 31. Sealing part; 32. Contact surface; 33. Second inclined surface; 34. Settling groove; 35. Connecting part; 311. Expansion part; 351. Relief groove; 41. Third inclined surface; 91. Anti-reverse block; 92. Operating handwheel. Detailed Implementation

[0023] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, 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 utility model.

[0025] In this embodiment of the utility model, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0026] Reference example Figures 1 to 5A shut-off valve for improving sealing performance includes a valve body 1. The valve body 1 has an inlet channel 11 and an outlet channel 12 at its two ends. A valve seat 13 is provided between the inlet channel 11 and the outlet channel 12. A sealing element 2 is sleeved on the inner wall of the valve seat 13. The inlet channel 11 is provided with a liftable valve disc 3, which is located above the sealing element 2. A sealing part 31 extends from one end of the valve disc 3. The outer wall of the sealing part 31 is provided with an inclined contact surface 32, which closely abuts against the inner wall of the sealing element 2. A liftable pressure plate 4 is provided inside the sealing element 2 and abuts against the inlet of the sealing element 2. A spring 5 is also provided inside the sealing element 2 and applies an upward force to the pressure plate 4, causing the sealing part 31 to expand radially.

[0027] By setting an inclined contact surface 32, a stable contact relationship is formed between the sealing part 31 and the inner wall of the sealing element 2. During long-term opening and closing operations, the sealing part 31 can still maintain a good fit with the sealing element 2, avoiding sealing failure due to increased wear of the contact surface 32. As the contact surface 32 is gradually damaged during use, its diameter changes. The spring 5 applies an upward force, causing the sealing part 31 to expand radially, thereby enhancing the contact tightness between it and the inner wall of the sealing element 2, further improving sealing performance, extending service life, and effectively solving the sealing failure problem in the background technology.

[0028] This design introduces an elastic compensation mechanism into the sealing structure, enabling the sealing part 31 to maintain an effective seal even under wear conditions, enhancing the structure's self-adaptability. At the same time, the inclined surface design helps guide the sealing part 31 to maintain a stable posture during movement, reducing offset or jamming and improving the overall operational reliability. The optimized contact method between the sealing part 31 and the sealing element 2 helps reduce frictional resistance, reduce pneumatic energy loss during opening and closing operations, and improve the equipment's utilization efficiency. The inclined surface design makes the diameter of the sealing part 31 larger at the top and smaller at the bottom.

[0029] It is worth mentioning that the inlet of the seal 2 is provided with a first inclined surface 21, and the valve disc 3 is provided with a second inclined surface 33 that abuts against the first inclined surface 21. When the valve disc 3 is fully inserted into the seal 2, the first inclined surface 21 and the second inclined surface 33 abut against each other tightly. This increases the contact area and also prevents the medium from entering the valve seat 13, further improving the sealing performance.

[0030] It is worth mentioning that one end of the valve disc 3 is provided with a recess 34, which is on the same end face as the sealing part 31. The other end of the valve disc 3 is provided with a connecting part 35. One side of the connecting part 35 is provided with a relief groove 351. The recess 34 is coaxially arranged with the protrusion 24. When the valve disc 3 enters the sealing part 2, the recess 34 prevents the valve disc 3 from continuing to descend.

[0031] It is worth mentioning that the valve body 1 is provided with a valve cover 6, and the valve cover 6 is provided with a sealing sleeve 7 and a connecting plate 8. The connecting plate 8 is located above the sealing sleeve 7. The connecting plate 8 is threadedly connected to the valve stem 9. The valve stem 9 passes through the sealing sleeve 7 and the connecting part 35. The end of the valve stem 9 is provided with a stop block 91 and is placed in the relief groove 351. The valve stem 9 is provided with an operating handwheel 92. By rotating the valve stem 9 through the operating handwheel 92, it is driven to make an upward or downward movement, and the valve disc 3 moves with it. The stop block 91 connects and fixes the valve stem 9 to the connecting part 35.

[0032] It is worth mentioning that a support plate 22 is provided at one end of the seal 2. Several support parts 23 are evenly distributed along the circumference between the support plate 22 and the seal 2. The support plate 22 is provided with a protrusion 24 to prevent the spring 5 from shifting. Reinforcing ribs 25 are provided between the support parts 23 and the seal 2, and between the support plate 22 and the protrusion 24. The support plate 22 provides stable support for the spring 5, and the reinforcing ribs 25 improve the structural strength and prevent it from being deformed by the impact of high pressure medium.

[0033] It is worth mentioning that the inlet of the sealing part 31 is provided with an inclined expansion part 311, which allows the pressure plate 4 to radially expand the sealing part 31 in its guiding direction;

[0034] It is worth mentioning that the pressure plate 4 is provided with a third inclined surface 41 corresponding to the expansion part 311, and the pressure plate 4 is slidably disposed on the protrusion 24.

[0035] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present utility model. It should not be construed that the specific implementation of the present utility model is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present utility model, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted by the present utility model.

Claims

1. A shut-off valve for improving sealing performance, comprising a valve body (1), wherein the valve body (1) has an inlet channel (11) and an outlet channel (12) respectively at both ends, and a valve seat (13) communicating with the inlet channel (11) and the outlet channel (12) is provided, characterized in that: The inner wall of the valve seat (13) is fitted with a sealing element (2). The liquid inlet channel (11) is provided with a liftable valve disc (3) and is located above the sealing element (2). One end of the valve disc (3) extends to provide a sealing part (31). The outer wall of the sealing part (31) is provided with an inclined contact surface (32) and closely abuts against the inner wall of the sealing element (2). The sealing element (2) is provided with a liftable pressure plate (4) and abuts against the inlet of the sealing element (2). The sealing element (2) is also provided with a spring (5) and applies an upward force to the pressure plate (4) to make the sealing part (31) expand radially.

2. The shut-off valve for improving sealing performance according to claim 1, characterized in that: The seal (2) has a first inclined surface (21) at its inlet, and the valve disc (3) has a second inclined surface (33) that abuts against the first inclined surface (21).

3. The shut-off valve for improving sealing performance according to claim 1, characterized in that: One end of the valve disc (3) is provided with a recess (34) and is on the same end face as the sealing part (31). The other end of the valve disc (3) is provided with a connecting part (35), and one side of the connecting part (35) is provided with a relief groove (351).

4. The shut-off valve for improving sealing performance according to claim 3, characterized in that: The valve body (1) is provided with a valve cover (6), and the valve cover (6) is provided with a sealing sleeve (7) and a connecting plate (8). The connecting plate (8) is located above the sealing sleeve (7). The connecting plate (8) is threadedly connected to a valve stem (9). The valve stem (9) passes through the sealing sleeve (7) and the connecting part (35). The end of the valve stem (9) is provided with a backstop block (91) and placed in a relief groove (351). The valve stem (9) is provided with an operating handwheel (92).

5. The shut-off valve for improving sealing performance according to claim 1, characterized in that: One end of the sealing element (2) is provided with a support plate (22). A plurality of support parts (23) are evenly distributed between the support plate (22) and the sealing element (2) along its circumferential direction. The support plate (22) is provided with a protruding post (24) to prevent the spring (5) from deflecting. The support parts (23) and the sealing element (2) and the support plate (22) and the protruding post (24) are provided with reinforcing ribs (25).

6. The shut-off valve for improving sealing performance according to claim 5, characterized in that: The sealing part (31) has an inclined expansion part (311) at the entrance.

7. The shut-off valve for improving sealing performance according to claim 6, characterized in that: The pressure plate (4) is provided with a third inclined surface (41) corresponding to the expansion portion (311), and the pressure plate (4) is slidably disposed on the protrusion (24).

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