Novel gate valve special for natural gas

Abstract

The novel gate valve comprises a valve body and a gate plate, a valve cover is fixedly installed at the upper end of the valve body, an inlet and an outlet are formed in the front end and the rear end of the valve body respectively, limiting straight sliding tables are arranged on the two sides of the inner wall of the valve body, and limiting straight sliding grooves are formed in the outer sides of the two ends of the gate plate. A transmission nut is fixedly installed at the upper end of the valve deck, the inner wall of the transmission nut is in threaded connection with a valve rod, and a hand wheel used for rotating the valve rod is fixedly installed at the top end of the valve rod. The bottom of the valve rod is rotationally connected with a limiting pipe through a rotating shaft, a main supporting spring is fixedly installed at the inner top end of the limiting pipe, a centering rod is fixedly installed at the bottom of the main supporting spring, a centering groove is fixedly formed in the inner bottom of the valve body, and limiting ring grooves are formed in the outer sides of the front end and the rear end of the gate plate. According to the utility model, the flashboard can be accurately and tightly attached to the sealing surface in the closing process, so that the sealing performance and the stability of the valve are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gate valves, in particular to a novel gate valve dedicated for natural gas. Background Technique

[0002] A gate valve refers to a valve in which the closing member (gate plate) moves in a direction perpendicular to the center line of the passage. The opening and closing member of the gate valve is the gate plate, and the moving direction of the gate plate is perpendicular to the fluid direction. The gate valve is sealed by the contact between the valve seat and the gate plate. Usually, the sealing surface is surfacing welded with metal materials to increase wear resistance, such as surfacing welding 1Cr13, STL6, stainless steel, etc. The gate valve has specific functions and functions in the pipeline system: intercepting fluid: The main function of the gate valve is to be fully open and fully closed, and it cannot be used for regulation and throttling. In occasions where it is necessary to completely intercept the fluid flow, the gate valve is an ideal choice. Sealing performance: The gate valve achieves a good sealing effect through the close contact between the valve seat and the gate plate, preventing fluid leakage.

[0003] However, in actual use of the prior art, natural gas, as a clean and efficient energy source, plays an increasingly important role in modern society. However, during the transportation of natural gas, as a key control element, the performance of the gate valve directly affects the safe and stable operation of the entire pipeline system. Traditional gate valves usually achieve fitting seals through the contact between the valve seat and the gate plate. However, when achieving fitting seals through the contact between the valve seat and the gate plate, problems such as insufficient sealing performance and poor stability are likely to occur, making it difficult to meet the requirements for safety and stability of modern natural gas pipeline systems. Content of the Utility Model

[0004] The purpose of the utility model is to provide a novel gate valve dedicated for natural gas to solve the problems put forward in the above background technique that natural gas, as a clean and efficient energy source, plays an increasingly important role in modern society. However, during the transportation of natural gas, as a key control element, the performance of the gate valve directly affects the safe and stable operation of the entire pipeline system. Traditional gate valves usually achieve fitting seals through the contact between the valve seat and the gate plate. However, when achieving fitting seals through the contact between the valve seat and the gate plate, problems such as insufficient sealing performance and poor stability are likely to occur, making it difficult to meet the requirements for safety and stability of modern natural gas pipeline systems.

[0005] To achieve the above purpose, the utility model provides the following technical solutions: It includes a valve body and a gate plate. A valve cover is fixedly installed at the upper end of the valve body. An inlet and an outlet are respectively opened at the front and rear ends of the valve body. Limiting straight sliding platforms are opened on both sides of the inner wall of the valve body. Limiting straight sliding grooves are opened on the outer sides of both ends of the gate plate. A transmission nut is fixedly installed at the upper end of the valve cover. A valve rod is threadedly connected to the inner wall of the transmission nut. A handwheel for rotating the valve rod is fixedly installed at the upper end of the valve rod;

[0006] The bottom of the valve stem is rotatably connected to a limit pipe through a rotating shaft. A main support spring is fixedly installed at the inner top end of the limit pipe. A centering rod is fixedly installed at the bottom of the main support spring. A centering groove is fixedly installed at the inner bottom of the valve body. Limit ring grooves are formed on the outer sides of the front and rear ends of the gate plate. A secondary support spring is fixedly installed inside the limit ring groove. A support ring is fixedly installed at the outer end of the secondary support spring. A first sealing ring is fixedly installed at the outer end of the support ring. A valve seat is formed in the middle of the inner wall of the valve body. Second sealing rings are fixedly installed on both sides of the valve seat.

[0007] Preferably, connecting flanges are respectively fixedly installed at the outer ends of the inlet and the outlet, so as to communicate with an external natural gas pipeline through the connecting flanges. The valve cover is fixedly installed at the upper end of the valve body.

[0008] Preferably, there are two limit straight sliding platforms, which are symmetrically distributed on both sides of the inner wall of the valve body. The limit straight sliding platforms are fitted and movably connected to the inner wall of the limit straight sliding grooves, so as to limit the linear movement of the gate plate through the cooperation of the limit straight sliding grooves and the limit straight sliding platforms.

[0009] Preferably, the outer curved surface of the lower end of the valve stem is rotatably connected to the middle of the upper end of the gate plate through a rotating shaft. A fastening nut for locking and fastening the valve stem is threadedly connected to the outer curved surface of the upper end of the valve stem.

[0010] Preferably, the upper end of the centering rod is fitted and movably connected to the inner wall of the limit pipe, so as to elastically support and limit the upper end of the centering rod through the cooperation of the limit pipe and the main support spring. The outer curved surface of the bottom of the centering rod is fitted and movably connected to the inner wall of the centering groove, so as to center and limit the lower end of the centering rod through the centering groove.

[0011] Preferably, there are two limit ring grooves, which are symmetrically distributed on the outer sides of the front and rear ends of the gate plate.

[0012] Preferably, the second sealing ring and the first sealing ring are mutually fitted and sealed, so as to fit and seal the valve seat and the gate plate through the cooperation of the second sealing ring and the first sealing ring.

[0013] Compared with the prior art, the beneficial effects of the present utility model are:

[0014] 1. When the valve stem moves downward in the present utility model, it will drive the gate plate to move downward in a straight line. When the gate plate moves downward in a straight line, the straight-line movement of the gate plate will be limited by the cooperation of the limit straight chute and the limit straight slide, so that the gate plate maintains a stable downward straight-line movement. When the gate plate maintains a stable downward straight-line movement, it will synchronously drive the first sealing ring and the second sealing ring to fit and seal with each other, so that the gate plate seals the valve seat. At the same time, when the valve stem moves downward in a straight line, it will drive the limit pipe to move downward in a straight line. When the limit pipe moves downward in a straight line, it will synchronously drive the bottom of the centering rod to move downward in a straight line and insert into the inner wall of the centering groove. When the bottom of the centering rod moves downward in a straight line and inserts into the inner wall of the centering groove, the gate plate will be kept centered and stable. At the same time, when the limit pipe moves downward in a straight line, it will push the compression auxiliary support spring. When the auxiliary support spring is pushed and compressed, the buffer effect of the limit pipe moving downward in a straight line is achieved, so as to play a role in stably closing the valve seat by the gate plate downward;

[0015] 2. When the first sealing ring and the second sealing ring fit and seal with each other in the present utility model, the first sealing ring will be extruded by the second sealing ring and move inward. When the first sealing ring moves inward, it will drive the support ring to move inward. When the support ring moves inward, it will push the compression auxiliary support spring. When the auxiliary support spring is pushed and compressed, the elastic potential energy generated by the compression of the auxiliary support spring will push the first sealing ring to move outward through the support ring in the reverse direction, so that when the first sealing ring and the second sealing ring fit and seal with each other, the first sealing ring will always maintain an outward fit and seal with the second sealing ring, thus ensuring that the gate plate can accurately and tightly fit on the sealing surface during the closing process, thereby improving the sealing performance and stability of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of a novel gate valve for natural gas in the present utility model;

[0017] Figure 2 is a schematic cross-sectional view of the overall structure of a novel gate valve for natural gas in the present utility model Figure 1 ;

[0018] Figure 3 is a schematic cross-sectional view of the overall structure of a novel gate valve for natural gas in the present utility model Figure 2 ;

[0019] Figure 4 is a schematic cross-sectional view of a partial structure of a novel gate valve for natural gas in the present utility model.

[0020] In the figure: 1. Valve body; 2. Gate plate; 3. Valve cover; 4. Inlet; 5. Outlet; 6. Limit straight slide; 7. Limit straight slide groove; 8. Transmission nut; 9. Valve stem; 10. Handwheel; 11. Limit tube; 12. Main support spring; 13. Centering rod; 14. Centering groove; 15. Limit ring groove; 16. Auxiliary support spring; 17. Support ring; 18. First sealing ring; 19. Valve seat; 20. Second sealing ring. Specific embodiments

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0022] Please refer to Figures 1-4 , the present invention provides a technical solution for a new type of gate valve for natural gas: including a valve body 1 and a gate plate 2. A valve cover 3 is fixedly installed at the upper end of the valve body 1, and the valve cover 3 is fixedly installed at the upper end of the valve body 1. Inlets 4 and outlets 5 are respectively opened at the front and rear ends of the valve body 1. Connecting flanges are fixedly installed at the outer ends of the inlets 4 and outlets 5, so as to be connected to the external natural gas pipeline through the connecting flanges. Limit straight slides 6 are opened on both sides of the inner wall of the valve body 1, and the number of the limit straight slides 6 is two, which are symmetrically distributed on both sides of the inner wall of the valve body 1. Limit straight slide grooves 7 are opened on the outer sides of both ends of the gate plate 2, and the limit straight slides 6 are fitted and movably connected to the inner walls of the limit straight slide grooves 7, so as to limit the linear movement of the gate plate 2 through the cooperation of the limit straight slide grooves 7 and the limit straight slides 6. A transmission nut 8 is fixedly installed at the upper end of the valve cover 3. A valve stem 9 is threadedly connected to the inner wall of the transmission nut 8. The outer curved surface of the lower end of the valve stem 9 is rotatably connected to the middle of the upper end of the gate plate 2 through a rotating shaft. A fastening nut for locking and fastening the valve stem 9 is threadedly connected to the outer curved surface of the upper end of the valve stem 9. A handwheel 10 for rotating the valve stem 9 is fixedly installed at the upper end of the valve stem 9;

[0023] The bottom of the valve stem 9 is rotationally connected with a limit tube 11 through a rotating shaft. At the inner top end of the limit tube 11, a main support spring 12 is fixedly installed. At the bottom of the main support spring 12, a centering rod 13 is fixedly installed. The upper end of the centering rod 13 is fitted and movably connected to the inner wall of the limit tube 11, so that the upper end of the centering rod 13 is elastically supported and limited by the cooperation of the limit tube 11 and the main support spring 12. At the inner bottom of the valve body 1, a centering groove 14 is fixedly installed. The outer curved surface of the bottom of the centering rod 13 is fitted and movably connected to the inner wall of the centering groove 14, so that the lower end of the centering rod 13 is centered and limited by the centering groove 14. On the outer sides of the front and rear ends of the gate plate 2, limit ring grooves 15 are opened. The number of the limit ring grooves 15 is two, which are symmetrically distributed on the outer sides of the front and rear ends of the gate plate 2 respectively. Inside the limit ring groove 15, a secondary support spring 16 is fixedly installed. At the outer end of the secondary support spring 16, a support ring 17 is fixedly installed. At the outer end of the support ring 17, a first sealing ring 18 is fixedly installed. In the middle of the inner wall of the valve body 1, a valve seat 19 is opened. On both sides of the valve seat 19, second sealing rings 20 are fixedly installed. The second sealing ring 20 and the first sealing ring 18 are mutually fitted and sealed, so that the valve seat 19 and the gate plate 2 are fitted and sealed by the cooperation of the second sealing ring 20 and the first sealing ring 18.

[0024] Working principle: When in use, for this utility model, by rotating the handwheel 10, when the handwheel 10 rotates, it will drive the valve stem 9 to rotate. When the valve stem 9 rotates, the valve stem 9 will move up and down due to the acting force generated by the threaded connection with the inner wall of the transmission nut 8. When the valve stem 9 moves downward, it will drive the gate plate 2 to move downward in a straight line. When the gate plate 2 moves downward in a straight line, the straight-line movement of the gate plate 2 will be limited by the cooperation of the limit straight chute 7 and the limit straight slide 6, so that the gate plate 2 maintains a stable downward straight-line movement. When the gate plate 2 maintains a stable downward straight-line movement, it will synchronously drive the first sealing ring 18 and the second sealing ring 20 to be mutually fitted and sealed, so that the gate plate 2 seals the valve seat 19. At the same time, when the valve stem 9 moves downward in a straight line, it will drive the limit tube 11 to move downward in a straight line. When the limit tube 11 moves downward in a straight line, it will synchronously drive the bottom of the centering rod 13 to move downward in a straight line and insert into the inner wall of the centering groove 14. When the bottom of the centering rod 13 moves downward in a straight line and inserts into the inner wall of the centering groove 14, the gate plate 2 will be centered and stable. At the same time, when the limit tube 11 moves downward in a straight line, it will push and compress the secondary support spring 16. When the secondary support spring 16 is pushed and compressed, the buffer effect of the limit tube 11 moving downward in a straight line is utilized, so as to play a role in stably closing the valve seat 19 downward by the gate plate 2.

[0025] Meanwhile, when the first sealing ring 18 and the second sealing ring 20 are in mutual contact and sealing, the first sealing ring 18 will be subjected to the extrusion force of the second sealing ring 20 and move inward. When the first sealing ring 18 moves inward, it will drive the support ring 17 to move inward. When the support ring 17 moves inward, it will push the compression auxiliary support spring 16. When the auxiliary support spring 16 is pushed and compressed, the elastic potential energy generated by the compression of the auxiliary support spring 16 will push the first sealing ring 18 to move outward through the support ring 17, so that when the first sealing ring 18 and the second sealing ring 20 are in mutual contact and sealing, the first sealing ring 18 will always maintain outward contact and sealing with the second sealing ring 20, thus ensuring that the gate 2 can accurately and tightly fit on the sealing surface during the closing process, thereby improving the sealing performance and stability of the valve.

[0026] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0027] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A new type of gate valve dedicated to natural gas, characterized in that: It includes a valve body (1) and a gate plate (2). A valve cover (3) is fixedly installed at the upper end of the valve body (1). An inlet (4) and an outlet (5) are respectively opened at the front and rear ends of the valve body (1). Limiting straight sliding platforms (6) are opened on both sides of the inner wall of the valve body (1). Limiting straight sliding grooves (7) are opened on the outer sides of both ends of the gate plate (2). A transmission nut (8) is fixedly installed at the upper end of the valve cover (3). A valve stem (9) is threadedly connected to the inner wall of the transmission nut (8). A handwheel (10) for rotating the valve stem (9) is fixedly installed at the upper top end of the valve stem (9). The bottom of the valve stem (9) is rotationally connected to a limiting tube (11) through a rotating shaft. A main support spring (12) is fixedly installed at the inner top end of the limiting tube (11). A centering rod (13) is fixedly installed at the bottom of the main support spring (12). A centering groove (14) is fixedly installed at the inner bottom of the valve body (1). Limiting ring grooves (15) are opened on the outer sides of the front and rear ends of the gate plate (2). An auxiliary support spring (16) is fixedly installed inside the limiting ring groove (15). A support ring (17) is fixedly installed at the outer end of the auxiliary support spring (16). A first sealing ring (18) is fixedly installed at the outer end of the support ring (17). A valve seat (19) is opened in the middle of the inner wall of the valve body (1). Second sealing rings (20) are fixedly installed on both sides of the valve seat (19).

2. The novel gate valve dedicated to natural gas according to claim 1, wherein: Connecting flanges are respectively fixedly installed at the outer ends of the inlet (4) and the outlet (5), so as to be communicated with an external natural gas pipeline through the connecting flanges. The valve cover (3) is fixedly installed at the upper end of the valve body (1).

3. The novel gate valve dedicated to natural gas according to claim 2, wherein: There are two limiting straight sliding platforms (6), which are symmetrically distributed on both sides of the inner wall of the valve body (1). The limiting straight sliding platforms (6) are fitted and movably connected to the inner walls of the limiting straight sliding grooves (7), so as to limit the linear movement of the gate plate (2) through the cooperation of the limiting straight sliding grooves (7) and the limiting straight sliding platforms (6).

4. The novel gate valve dedicated to natural gas according to claim 3, wherein: The outer curved surface of the lower end of the valve stem (9) is rotationally connected to the middle of the upper end of the gate plate (2) through a rotating shaft. A fastening nut for locking and fastening the valve stem (9) is threadedly connected to the outer curved surface of the upper end of the valve stem (9).

5. The novel gate valve dedicated to natural gas according to claim 4, wherein: The upper end of the centering rod (13) is fitted and movably connected to the inner wall of the limiting tube (11), so as to elastically support and limit the upper end of the centering rod (13) through the cooperation of the limiting tube (11) and the main support spring (12). The outer curved surface of the bottom of the centering rod (13) is fitted and movably connected to the inner wall of the centering groove (14), so as to center and limit the lower end of the centering rod (13) through the centering groove (14).

6. The novel special gate valve for natural gas according to claim 5, wherein: There are two limiting ring grooves (15), which are symmetrically distributed on the outer sides of the front and rear ends of the gate plate (2).

7. The novel gate valve dedicated to natural gas according to claim 6, characterized in that: The second sealing ring (20) and the first sealing ring (18) are mutually fitted and sealed, so as to fit and seal the valve seat (19) and the gate plate (2) through the cooperation of the second sealing ring (20) and the first sealing ring (18).

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