Soft seal wedge gate valve

Abstract

The utility model provides a kind of soft sealing wedge gate valve, it includes valve body and wedge gate, and the valve body is equipped with gate runner and medium flow channel.Wedge gate has annular surface and oblique sealing surface, and the middle portion of each oblique sealing surface is respectively equipped with the transition sealing portion of L type, and transition sealing portion is bent from oblique sealing surface to annular surface, and the upper side corresponding to two transition sealing portions on oblique sealing surface is equipped with first arc sealing portion, and the lower side corresponding to two transition sealing portions on annular surface is equipped with second arc sealing portion.First arc sealing portion, transition sealing portion, second arc sealing portion constitute continuous three-dimensional sealing structure, and the continuous three-dimensional sealing structure extends from the oblique sealing surface of gate to arc surface, and first sealing groove, transition sealing groove, second sealing groove precisely matched on valve body form full-path sealing contact, significantly improve sealing reliability, and prolong the service life of gate valve.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a soft-seal wedge gate valve. Background Technology

[0002] Gate valves are an indispensable basic valve type in industrial pipeline systems, renowned for their low flow resistance, excellent sealing performance, and bidirectional flow capability. A gate valve is a linear motion valve; its closing element (gate) moves along a path perpendicular to the direction of medium flow. The flow of fluid is controlled by the raising and lowering of the gate. Main types include wedge gate valves, parallel gate valves, and knife gate valves. The wedge-shaped gate of a wedge gate valve generates a large sealing pressure when closed, achieving a forced seal. It is suitable for various operating conditions, especially high-temperature and high-pressure applications.

[0003] In the design of traditional wedge gate valves, the sealing structure is mostly set between a single side of the wedge gate and the valve body, which can easily create a leakage path between the gate and the valve body. At the same time, the sealing material is prone to tearing or accelerated wear during the valve opening and closing process or when there are pressure fluctuations. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a soft-seal wedge gate valve. Through the cooperation of the wedge gate plate and the sealing structure of the valve body, the sealing reliability of the gate valve is improved and its service life is extended.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: This utility model provides a soft-seal wedge gate valve, which includes a valve body and a wedge gate. The valve body is provided with a gate groove and medium flow channels located on both sides of the gate groove.

[0006] The wedge-shaped gate has an annular surface and oblique sealing surfaces on both sides of the annular surface. The central axis of the annular surface is parallel to the central axis of the medium flow channel. Each oblique sealing surface has a transition sealing part on both sides of its middle portion. The transition sealing part is L-shaped and bends from the oblique sealing surface to the annular surface. A first arc-shaped sealing part is provided above the two transition sealing parts on the oblique sealing surface, and a second arc-shaped sealing part is provided below the two transition sealing parts on the annular surface.

[0007] Both sides of the gate slide groove are provided with a first sealing groove that matches the structure of the first arc-shaped sealing part, a transition sealing groove that matches the structure of the transition sealing part, and a second sealing groove that matches the structure of the second arc-shaped sealing part.

[0008] Preferably, the valve body has a valve cavity located above and communicating with the gate slide groove; the inner wall of the valve cavity has a guide groove extending from the valve cavity to the gate slide groove; a guide block is provided on the annular surface, and the guide block slides in cooperation with the guide groove.

[0009] Preferably, the soft-seal wedge gate valve further includes a valve stem disposed within the valve cavity; the top of the wedge gate is provided with a boss portion, the boss portion is provided with a connecting hole, the connecting hole extends from the boss portion to the bottom end of the gate, the central axis of the connecting hole is perpendicular to the central axis of the annular surface, and the valve stem is threadedly engaged with the connecting hole.

[0010] Preferably, the bottom end of the gate slide groove is provided with a limiting part, and the limiting part corresponds vertically to the connecting hole.

[0011] Preferably, the soft-seal wedge gate valve further includes a valve cover and a pressure cover, the valve cover being disposed above the valve body, and the valve cavity being formed between the valve cover and the valve body; the pressure cover being disposed above the valve cover; and the valve stem passing through the pressure cover and the valve cover.

[0012] Preferably, the valve cover is provided with a bushing, the bushing is provided with a thrust groove, and the valve stem is provided with a thrust ring that cooperates with the thrust groove.

[0013] Preferably, the gland is provided with a sealing seat, which extends into the valve cover and abuts against the bushing.

[0014] Preferably, a first sealing ring is provided between the pressure cap and the valve stem, and between the valve cover and the valve stem; a second sealing ring is provided between the sealing seat and the valve stem, between the sealing seat and the pressure cap, and between the sealing seat and the valve cover; the central axis of the first sealing ring and the central axis of the second sealing ring coincide with the central axis of the valve stem.

[0015] Preferably, the valve cover and the valve body, and the pressure cap and the valve cover are respectively connected by screws, and a third sealing ring is provided between the valve cover and the valve body, and between the pressure cap and the valve cover.

[0016] Preferably, the surface of the wedge-shaped gate is covered with a rubber sealing layer.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows: In the soft-seal wedge gate valve of this utility model, the first arc-shaped sealing part, the transition sealing part, and the second arc-shaped sealing part on the gate plate constitute a continuous three-dimensional sealing structure. This continuous three-dimensional sealing structure extends from the inclined sealing surface of the gate plate to the arc-shaped surface, forming a full-path sealing contact with the first sealing groove, the transition sealing groove, and the second sealing groove that are precisely matched on the valve body, which significantly improves the sealing reliability. The transition sealing part connects the inclined sealing surface and the annular surface through a bending structure, which can adaptively deform when the wedge gate plate is opened and closed or when the medium pressure fluctuates, compensating for the wear of the sealing surface and assembly errors, maintaining a constant sealing specific pressure, reducing wear, and extending the service life of the valve. While maintaining low flow resistance characteristics, it significantly improves the sealing performance and reduces the risk of leakage. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of a soft-seal wedge gate valve according to the present invention.

[0019] Figure 2 for Figure 1 Enlarged view of the structure at point A in the middle.

[0020] Figure 3 for Figure 2 A schematic diagram of the corresponding valve body's partial structure.

[0021] Figure 4 This is a schematic diagram of the wedge-shaped gate in some embodiments.

[0022] Figure 5 This is a partial structural diagram of the valve body and the wedge gate.

[0023] Figure 6 for Figure 1 Enlarged view of the structure at point B in the middle.

[0024] In the figure, 10-valve body, 11-gate groove, 111-first sealing groove, 112-transition sealing groove, 113-second sealing groove, 114-limiting part, 12-medium flow channel, 13-valve cavity, 131-guide groove; 20-wedge gate, 21-annular surface, 22-oblique sealing surface, 23-transition sealing part, 24-first arc-shaped sealing part, 25-second arc-shaped sealing part, 26-guide block, 27-bore part, 271-connecting hole, 28-rubber sealing layer; 30-valve stem, 31-thrust ring; 40-valve cover, 41-shaft sleeve, 411-thrust groove, 42-first sealing ring, 43-screw, 44-third sealing ring; 50-gland, 51-sealing seat, 52-second sealing ring. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the described embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. It is understood that, without conflict, some technical means of the various embodiments described herein can be substituted for or combined with each other.

[0026] In the description of this utility model, the terms "first," "second," etc., are used only to distinguish the described objects and have no sequential or technical meaning. Therefore, objects specified with "first," "second," etc., may explicitly or implicitly include one or more of those objects. Furthermore, the words "one" or "a" do not indicate a quantity limitation, but rather indicate the presence of at least one, while "multiple" indicates at least two.

[0027] In the description of this utility model, references to "one embodiment" or "some embodiments" mean that one or more embodiments of the utility model include the specific features, structures, or characteristics described in connection with that embodiment. Therefore, the phrases "one embodiment," "some embodiments," "other embodiments," "and other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized.

[0028] This utility model provides a soft-seal wedge gate valve, see reference. Figure 1 The soft-seal wedge gate valve includes a valve body 10 and a wedge gate 20. The valve body 10 has a gate groove 11 and medium flow channels 12 located on both sides of the gate groove 11. The gate groove 11 has a generally V-shaped structure that is wider at the top and narrower at the bottom, and its structure matches the structure of the wedge gate 20.

[0029] Specifically, in combination Figures 1 to 5The wedge-shaped gate 20 has an annular surface 21 and oblique sealing surfaces 22 located on both sides of the annular surface 21. The central axis of the annular surface 21 is parallel to the central axis of the medium flow channel 12, and there is a non-right angle between the oblique sealing surfaces 22 and the central axis of the annular surface 21. Each oblique sealing surface 22 has a transition sealing portion 23 on both sides of its middle portion. The transition sealing portion 23 is L-shaped and bends from the oblique sealing surface 22 to the annular surface 21. A first arc-shaped sealing portion 24 is provided on the oblique sealing surface 22 above the two transition sealing portions 23. The first arc-shaped sealing portion 24 extends from one side of the transition sealing portion 23 along the upper arc-shaped contour of the oblique sealing surface 22 to the other side of the transition sealing portion 23. A second arc-shaped sealing portion 25 is provided on the annular surface 21 below the two transition sealing portions 23. The second arc-shaped sealing portion 25 extends from one side of the transition sealing portion 23 along the lower arc-shaped contour of the arc-shaped surface to the other side of the transition sealing portion 23.

[0030] Both sides of the gate slide groove 11 are provided with a first sealing groove 111 that matches the structure of the first arc-shaped sealing part 24, a transition sealing groove 112 that matches the structure of the transition sealing part 23, and a second sealing groove 113 that matches the structure of the second arc-shaped sealing part 25. When the soft-seal wedge gate valve is in the closed state, the first arc-shaped sealing part 24 is located in the first sealing groove 111, the transition sealing part 23 is located in the transition sealing groove 112, and the second arc-shaped sealing part 25 is located in the second sealing groove 113.

[0031] In the aforementioned soft-seal wedge gate valve, the first arc-shaped sealing part 24, the transition sealing part 23, and the second arc-shaped sealing part 25 on the gate 20 constitute a continuous three-dimensional sealing structure. This continuous three-dimensional sealing structure extends from the oblique sealing surface 22 of the gate 20 to the annular surface 21, forming a full-path sealing contact with the first sealing groove 111, the transition sealing groove 112, and the second sealing groove 113 that are precisely matched in the valve body 10, significantly improving sealing reliability. The transition sealing part 23 connects the oblique sealing surface 22 and the annular surface 21 through a bending structure, which can adaptively deform when the wedge gate 20 is opened and closed or when the medium pressure fluctuates, compensating for sealing surface wear and assembly errors, maintaining a constant sealing specific pressure, reducing wear, and extending the valve's service life. While maintaining low flow resistance characteristics, it significantly improves sealing performance and reduces leakage risk.

[0032] Combined with reference Figures 3 to 5The valve body 10 has a valve cavity 13, which is located above and communicates with the gate slide groove 11. A guide groove 131 is provided on the inner wall of the valve cavity 13, extending from the valve cavity 13 to the gate slide groove 11. A guide block 26 is provided on the annular surface 21, and the guide block 26 slides in cooperation with the guide groove 131. The cooperative design of the guide groove 131 and the guide block 26 provides precise linear motion guidance for the lifting and lowering of the wedge-shaped gate 20, ensuring that the gate maintains the correct posture during opening and closing, preventing skewing and jamming, and ensuring precise alignment of the oblique sealing surface 22, the transition sealing part 23, etc., with the sealing groove of the valve body 10. This effectively maintains sealing reliability and extends the valve's service life.

[0033] Reference Figure 1 and Figure 2 The soft-seal wedge gate valve also includes a valve stem 30, which is disposed within the valve cavity 13. The top of the wedge gate 20 has a boss 27, in which a connecting hole 271 is provided. The connecting hole 271 extends from the boss 27 to the bottom of the wedge gate 20, and the central axis of the connecting hole 271 is perpendicular to the central axis of the annular surface 21. The valve stem 30 is threadedly engaged with the connecting hole 271. When the valve stem 30 rotates, it drives the wedge gate 20 to rise and fall through the threaded connection structure. The design of the connecting hole 271 penetrating the wedge gate 20 effectively converts the rotational motion of the valve stem 30 into the linear rising and falling motion of the wedge gate 20. This structure is compact and has reliable transmission.

[0034] Furthermore, a limiting part 114 is provided at the bottom end of the gate slide groove 11, which corresponds vertically to the connecting hole 271. The limiting part 114 precisely limits the lowest position of the wedge gate 20's descent, preventing the wedge gate 20 from descending excessively, protecting the valve stem 30 and the wedge gate 20 structure, and providing a positioning reference when the valve is closed.

[0035] Reference Figure 1 and Figure 6 The soft-seal wedge gate valve also includes a valve cover 40 and a gland 50. The valve cover 40 is located above the valve body 10, forming a valve cavity 13 between the valve cover 40 and the valve body 10. The gland 50 is located above the valve cover 40. The valve stem 30 passes through the gland 50 and the valve cover 40. The valve cover 40 closes the upper part of the valve body 10, forming the valve cavity 13 that accommodates the valve stem 30 and allows the wedge gate 20 to move up and down. The gland 50 closes the upper part of the valve cover 40. Together, they constitute the upper sealing cavity of the gate valve, providing protection for the internal moving parts and providing a passage and sealing base for the valve stem 30 to pass through.

[0036] In some preferred embodiments, the valve cover 40 is provided with a bushing 41, and the bushing 41 is provided with a thrust groove 411. The valve stem 30 is provided with a thrust ring 31 that mates with the thrust groove 411. The engagement between the thrust ring 31 and the thrust groove 411 bears the axial thrust generated when the valve is closed, which is generated by the medium pressure acting on the wedge gate 20 and transmitted to the valve stem 30. This structural design effectively prevents this huge thrust from acting directly on the drive mechanism (such as a handwheel or actuator), protects the threads and upper structure of the valve stem 30, and improves the reliability and lifespan of the valve under high-pressure conditions.

[0037] Furthermore, the gland 50 is provided with a sealing seat 51, which extends into the valve cover 40 and abuts against the bushing 41. Even further, a first sealing ring 42 is provided between the gland 50 and the valve stem 30, and between the valve cover 40 and the valve stem 30; a second sealing ring 52 is provided between the sealing seat 51 and the valve stem 30, between the sealing seat 51 and the gland 50, and between the sealing seat 51 and the valve cover 40; the central axis of the first sealing ring 42 and the central axis of the second sealing ring 52 coincide with the central axis of the valve stem 30. The first sealing ring 42 can be a type A sealing ring, and the second sealing ring can be a type O sealing ring.

[0038] The sealing seat 51 serves as the mounting base for the key sealing component at the protruding part of the valve stem 30. Its extension abuts against the bushing 41, ensuring stable positioning and alignment of the sealing component and achieving effective dynamic sealing at the valve stem 30. The first sealing ring 42 and the second sealing ring 52 form seals at multiple key interfaces, significantly reducing the risk of leakage at the valve stem 30 and effectively improving the overall sealing performance of the valve.

[0039] Reference Figure 1 and Figure 6 The valve cover 40 is connected to the valve body 10, and the gland 50 is connected to the valve cover 40 by screws 43. A third sealing ring 44 is provided between the valve cover 40 and the valve body 10, and between the gland 50 and the valve cover 40. The screw connection ensures the robustness of the connection between the valve cover 40 and the valve body 10, and between the gland 50 and the valve cover 40. The third sealing ring 44 provides a reliable seal at key static sealing surfaces such as the valve cover 40-valve body 10 and the gland 50-valve cover 40, preventing media leakage from these connection interfaces and further improving the overall sealing performance of the valve.

[0040] Reference Figure 2The surface of the wedge gate 20 is covered with a rubber sealing layer 28, which is key to achieving a soft seal. The rubber material possesses excellent elasticity and sealing properties, allowing it to fit tightly against the sealing groove on the valve body 10 to form a seal. The elastic properties of the rubber sealing layer 28 enable it to work in conjunction with the adaptive deformation of the transition sealing part 23 when the wedge gate 20 opens and closes or when the medium pressure fluctuates. This compensates for wear on the sealing surface and assembly errors, maintaining a constant sealing specific pressure, thereby significantly reducing wear, extending the valve's service life, and achieving excellent sealing performance.

[0041] In this invention, a soft-seal wedge gate valve comprises a first arc-shaped sealing portion, a transition sealing portion, and a second arc-shaped sealing portion on the gate plate, forming a continuous three-dimensional sealing structure. This continuous three-dimensional sealing structure extends from the oblique sealing surface of the gate plate to the arc-shaped surface, forming a full-path sealing contact with the precisely matched first sealing groove, transition sealing groove, and second sealing groove on the valve body, significantly improving sealing reliability. The transition sealing portion connects the oblique sealing surface and the annular surface through a bending structure, which can adaptively deform when the wedge gate plate is opened and closed or when the medium pressure fluctuates, compensating for sealing surface wear and assembly errors, maintaining a constant sealing specific pressure, reducing wear, and extending the valve's service life. While maintaining low flow resistance characteristics, it significantly improves sealing performance and reduces the risk of leakage.

[0042] This utility model has been described by the above-described embodiments; however, these embodiments are merely examples for implementing this utility model. It must be noted that the disclosed embodiments do not limit the scope of this utility model. Conversely, any modifications and refinements made without departing from the spirit and scope of this utility model are within the scope of patent protection of this utility model.

Claims

1. A soft-seal wedge gate valve, characterized in that: The soft-seal wedge gate valve includes a valve body and a wedge gate. The valve body is provided with a gate groove and medium flow channels located on both sides of the gate groove. The wedge-shaped gate has an annular surface and oblique sealing surfaces on both sides of the annular surface. The central axis of the annular surface is parallel to the central axis of the medium flow channel. Each oblique sealing surface has a transition sealing part on both sides of its middle portion. The transition sealing part is L-shaped and bends from the oblique sealing surface to the annular surface. A first arc-shaped sealing part is provided above the two transition sealing parts on the oblique sealing surface, and a second arc-shaped sealing part is provided below the two transition sealing parts on the annular surface. Both sides of the gate slide groove are provided with a first sealing groove that matches the structure of the first arc-shaped sealing part, a transition sealing groove that matches the structure of the transition sealing part, and a second sealing groove that matches the structure of the second arc-shaped sealing part.

2. The soft-seal wedge gate valve as described in claim 1, characterized in that: The valve body has a valve cavity, which is located above and communicates with the gate slide groove; the inner wall of the valve cavity has a guide groove that extends from the valve cavity to the gate slide groove; a guide block is provided on the annular surface, which slides in cooperation with the guide groove.

3. The soft-seal wedge gate valve as described in claim 2, characterized in that: The soft-seal wedge gate valve also includes a valve stem disposed within the valve cavity; the top of the wedge gate is provided with a boss portion, and a connecting hole is provided in the boss portion, the connecting hole extending from the boss portion to the bottom end of the gate, the central axis of the connecting hole being perpendicular to the central axis of the annular surface, and the valve stem being threadedly engaged with the connecting hole.

4. The soft-seal wedge gate valve as described in claim 3, characterized in that: The bottom end of the gate slide groove is provided with a limiting part, which corresponds vertically to the connecting hole.

5. The soft-seal wedge gate valve as described in claim 3, characterized in that: The soft-seal wedge gate valve further includes a valve cover and a pressure cover. The valve cover is located above the valve body, and the valve cavity is formed between the valve cover and the valve body. The pressure cover is located above the valve cover. The valve stem passes through the pressure cover and the valve cover.

6. The soft-seal wedge gate valve as described in claim 5, characterized in that: The valve cover is provided with a bushing, the bushing is provided with a thrust groove, and the valve stem is provided with a thrust ring that cooperates with the thrust groove.

7. The soft-seal wedge gate valve as described in claim 6, characterized in that: The gland is provided with a sealing seat, which extends into the valve cover and abuts against the bushing.

8. The soft-seal wedge gate valve as described in claim 7, characterized in that: A first sealing ring is provided between the pressure cap and the valve stem, and between the valve cover and the valve stem; a second sealing ring is provided between the sealing seat and the valve stem, between the sealing seat and the pressure cap, and between the sealing seat and the valve cover; the central axis of the first sealing ring and the central axis of the second sealing ring coincide with the central axis of the valve stem.

9. The soft-seal wedge gate valve as described in claim 5, characterized in that: The valve cover and the valve body, and the pressure cap and the valve cover are respectively connected by screws, and a third sealing ring is provided between the valve cover and the valve body, and between the pressure cap and the valve cover.

10. The soft-seal wedge gate valve as described in any one of claims 1-9, characterized in that: The surface of the wedge-shaped gate is covered with a rubber sealing layer.

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