Gate valve

Abstract

The utility model belongs to the technical field of gate valves, and particularly discloses a gate valve which comprises a valve deck, a valve rod, a thrust cock and a connecting piece, and the inner side wall of the valve deck protrudes to form a clamping part; the valve rod penetrates through the valve deck, and a limiting part is formed on the peripheral side of the valve rod and located on the inner side of the valve deck. The thrust plug cock is arranged on the periphery of the valve rod in a sleeving mode and located on the inner side of the valve deck. The thrust plug cock is provided with a positioning part matched with the clamping part. The connecting piece is detachably connected with the thrust cock and the valve cover; when the positioning part and the limiting part are axially staggered, the thrust plug cock is moved in the axial direction, the thrust plug cock can move to pass through the clamping part, and the limiting part of the valve rod abuts against and is limited in the valve cover; when the valve rod abuts against and is limited in the valve cover through the thrust plug cock, the positioning part can be axially limited in the valve cover by the clamping part by rotating the thrust plug cock; and when the positioning part is axially limited by the clamping part, the connecting piece is mounted, so that the thrust cock can be locked in the valve cover. The gate valve is convenient to assemble, and the valve rod is difficult to rush out of the valve cover by internal pressure.

Description

Technical Field

[0001] The present application belongs to the technical field of gate valves, and more specifically, relates to a gate valve. Background Art

[0002] A gate valve is a type of opening and closing component commonly used in pipeline systems to open and close pipelines.

[0003] In the related art, in order to realize the axial limit of the valve stem in the gate valve, a round head threaded structure is usually provided in the gate valve. Figure 1 As shown, a thrust nut c is threadedly installed on the valve cover b, and the valve stem a is axially fixed by the thrust nut c.

[0004] However, when the gate valve is opened and closed, the rotation of the valve stem can easily cause the thrust nut and valve cover to rotate backward, resulting in a loose connection. Furthermore, when the gate valve is operating, the internal pressure within the gate valve acts on the valve stem, which can easily push the valve stem out of the valve cover due to the strong internal pressure, posing a safety hazard. Furthermore, during the initial manufacturing of the gate valve, the valve cover and thrust nut are threaded together, requiring separate thread machining for each, requiring high machining precision. Furthermore, subsequent surface treatment of the valve cover requires secondary thread protection, resulting in low production efficiency and high manufacturing costs. Utility Model Content

[0005] In response to the defects or improvement needs of the existing technology, the present application provides a gate valve, which aims to improve the problems in the related technology that the valve stem may be pushed out of the valve cover by the internal pressure, and the valve cover is complicated to process and has high manufacturing costs.

[0006] The present application provides a gate valve comprising a valve cover, a valve stem, a thrust plug and a connector, wherein:

[0007] The inner side wall of the valve cover is protruded to form a clamping portion;

[0008] The valve stem passes through the valve cover, and a limiting portion is formed on the circumference of the valve stem, and the limiting portion is located inside the valve cover;

[0009] The thrust plug is sleeved on the outer periphery of the valve stem and located on the inner side of the valve cover, and the thrust plug has a positioning portion adapted to the clamping portion;

[0010] The connecting piece is detachably connected to the thrust cock and the valve cover;

[0011] When the positioning portion and the limiting portion are axially misaligned, the thrust plug is moved axially, so that the thrust plug moves through the clamping portion and the limiting portion of the valve stem is pressed against and limited inside the valve cover;

[0012] When the thrust plug abuts against the valve stem to limit it inside the valve cover, the thrust plug is rotated so that the positioning portion can be axially limited by the clamping portion inside the valve cover;

[0013] When the positioning portion is axially limited by the clamping portion, the connecting piece is installed to lock the thrust plug in the valve cover.

[0014] Through the above technical solutions conceived in this application, compared with the existing technology, this design adopts the inner wall of the valve cover to limit the detachment of the valve stem under the action of internal pressure. The valve cover, as an integral component, can provide a more reliable anti-detachment mechanism for the valve stem, while reducing the risk of valve stem detachment due to wear, fatigue or failure of other components, making it difficult for the valve stem to be pushed out of the valve cover by internal pressure.

[0015] In addition, this solution uses the inner wall of the valve cover and the screw-in thrust plug to jointly limit the axial position of the valve stem, and there is no need to perform thread processing on the valve cover, which means that the valve cover does not require too high processing precision, and there is no secondary protection of the thread. This design is conducive to reducing manufacturing costs and improving production efficiency; moreover, the thrust plug, connectors and other spare parts of this gate valve are inside the valve cover, which can prevent damage to the spare parts due to external factors, making this gate valve have many advantages such as easy assembly, long service life, and low maintenance cost.

[0016] As a further preference, a plurality of the clamping portions are provided at intervals along the circumferential direction of the inner wall of the valve cover, and a plurality of the positioning portions are provided corresponding to the number and position of the clamping portions.

[0017] As a further preferred embodiment, a friction-resistant part / wear-resistant lubricating part is provided between the top surface of the clamping part and the valve cover, and / or

[0018] A friction-resistant part / wear-resistant lubricating part is provided between the bottom surface of the clamping part and the thrust cock.

[0019] As a further preference, a first sealing member is provided between the valve stem and the thrust cock.

[0020] As a further preference, a second sealing member is provided between the outer peripheral wall of the thrust plug and the inner side wall of the valve cover.

[0021] As a further preference, the positioning portion is provided with a mounting hole for connection of a connector, and the clamping portion is provided with a limiting groove for limiting the installation of the connector.

[0022] As a further preference, the valve cover is a cast iron part.

[0023] As a further preference, the thrust cock is an integral hot stamping part.

[0024] As a further preference, the lower end of the valve stem is threadedly connected to a valve stem nut, and the valve disc of the gate valve is detachably connected to the valve stem nut.

[0025] As a further preferred embodiment, a T-shaped opening slot is provided at the upper end of the valve disc, and a protrusion is formed on the outer periphery of the valve stem nut, and the protrusion is snap-fitted with the T-shaped opening slot.

[0026] In general, the above technical solutions conceived by this application have the following technical advantages compared with the existing technologies:

[0027] 1. This design uses the inner wall of the valve cover to limit the valve stem from separating under the action of internal pressure. As an integral component, the valve cover can provide a more reliable anti-separation mechanism for the valve stem, reducing the risk of valve stem separation due to wear, fatigue or failure of other components, making it difficult for the valve stem to be pushed out of the valve cover due to internal pressure.

[0028] 2. This solution utilizes the inner wall of the bonnet and a screw-on thrust plug to jointly limit the axial position of the valve stem. This eliminates the need for threaded bonnet machining, reducing the need for high machining precision and eliminating the need for secondary thread protection. This helps reduce manufacturing costs and improves production efficiency. Furthermore, the thrust plug, connectors, and other components of this gate valve are located inside the bonnet, preventing damage to these components due to external factors. This results in numerous advantages, including easy assembly, a long service life, and low maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural diagram of the existing gate valve mentioned in the background technology section of this application;

[0030] Figure 2 This is a schematic structural diagram of a gate valve provided in an embodiment of the present application;

[0031] Figure 3 This is a schematic diagram of the partial structure of a gate valve provided in an embodiment of the present application;

[0032] Figure 4 This is an exploded view of a gate valve provided in an embodiment of the present application;

[0033] Figure 5 This is an exploded view of the valve cover, thrust plug and connector provided in an embodiment of the present application;

[0034] Figure 6 This is an assembly diagram of the valve cover, thrust plug and connector provided in an embodiment of the present application;

[0035] Figure 7 It is a structural schematic diagram of the thrust cock provided in an embodiment of the present application;

[0036] Figure 8 This is an assembly diagram of the valve stem, thrust plug and friction-resistant parts provided in an embodiment of the present application.

[0037] Throughout the drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0038] a. Valve stem; b. Valve cover; c. Thrust nut; 1. Valve cover; 1-1. Center hole; 1-2. Clamping part; 1-3. Limiting groove; 2. Valve stem; 2-1. Limiting part; 3. Thrust plug; 3-1. Positioning part; 3-2. Mounting hole; 4. Connecting part; 5-a. First sealing part; 5-b. Second sealing part; 6. Anti-friction part; 7. Valve stem nut; 7-1. Raised part; 8. Valve disc; 8-1. T-shaped opening groove; 9. Valve body. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0040] The following is combined with Figure 2-Figure 8 This application is described in further detail.

[0041] The embodiment of the present application discloses a gate valve. Figure 2-Figure 8 The gate valve includes a valve cover 1, a valve stem 2, a thrust plug 3 and a connecting piece 4, wherein the inner side wall of the valve cover 1 protrudes to form a clamping portion 1-2; the valve stem 2 passes through the valve cover 1, and a limiting portion 2-1 is formed on the circumference of the valve stem 2, and the limiting portion 2-1 is located on the inner side of the valve cover 1; the thrust plug 3 is sleeved on the outer periphery of the valve stem 2 and is located on the inner side of the valve cover 1, and the thrust plug 3 has a positioning portion 3-1 adapted to the clamping portion 1-2; and the connecting piece 4 is located on the inner side of the valve cover 1, and the connecting piece 4 is detachably connected to the thrust plug 3 and the valve cover 1. When the positioning portion 3-1 is axially misaligned with the limiting portion 2-1, the thrust plug 3 is moved axially, so that the thrust plug 3 can move through the clamping portion 1-2, and the limiting portion 2-1 of the valve stem 2 is pressed against and limited inside the valve cover 1; when the thrust plug 3 presses the valve stem 2 against and limits it inside the valve cover 1, the thrust plug 3 is rotated, so that the positioning portion 3-1 is axially limited inside the valve cover 1 by the clamping portion 1-2; when the positioning portion 3-1 is axially limited by the clamping portion 1-2, the connecting piece 4 is installed, so that the thrust plug 3 can be locked in the valve cover 1.

[0042] Specifically, if Figure 3 、 Figure 5 and Figure 6 As shown, in this embodiment, a through center hole 1-1 is provided at the center of the valve cover 1. The center hole 1-1 is generally in the shape of a multi-step hole with a narrow outer end and a wide inner end. The inner stepped surface of the center hole 1-1 can restrict the limiting portion 2-1 of the valve stem 2 inside the valve cover 1.

[0043] In this design, the valve stem 2 is assembled within the valve bonnet 1 in a concealed-stem assembly. After the valve stem 2 is inserted through the center hole 1-1 of the valve bonnet 1, the unique design of the center hole 1-1 prevents the valve stem 2 from being pushed out of the valve bonnet 1 by internal pressure. The thrust plug 3, screwed into the valve bonnet 1, then restrains the stopper 2-1 of the valve stem 2 against the stepped surface of the center hole 1-1, effectively limiting the axial position of the valve stem 2. Furthermore, with this design, the thrust plug 3, connector 4, and other components of this gate valve are located within the valve bonnet 1, preventing damage to these components due to external factors and extending the service life of this gate valve.

[0044] Preferably, the clamping portion 1-2 is provided at the outer edge of the inner side wall of the center hole 1-1, and a plurality of clamping portions 1-2 are provided at intervals along the circumference of the side wall; correspondingly, the number of the positioning portions 3-1 on the thrust cock 3 is the same as the number of the clamping portions 1-2, and the assembly position of each positioning portion 3-1 can be matched one-to-one with each clamping portion 1-2. Figure 5-Figure 7 As shown, specifically in this embodiment, two clamping parts 1-2 are provided, and two positioning parts 3-1 are provided.

[0045] As a preferred Figure 3-Figure 7 As shown, in order to facilitate the connection between the connecting member 4 and the positioning portion 3-1 and the clamping portion 1-2, the positioning portion 3-1 is provided with a mounting hole 3-2 for connection of the connecting member 4, and the clamping portion 1-2 is provided with a limiting groove 1-3 for installation and limiting of the connecting member 4; when the thrust plug 3 is screwed in so that the positioning portion 3-1 is axially limited by the clamping portion 1-2, the limiting groove 1-3 can be in a coaxial state with the mounting hole 3-2.

[0046] Specifically, the mounting hole 3-2 includes, but is not limited to, a threaded hole, a pin hole, or a polygonal hole. The connector 4 includes, but is not limited to, a positioning pin, a screw, or a polygonal rod. The shape and size of the retaining groove 1-3 are compatible with the connector 4. In actual production, the thrust plug 3, the connector 4, and the clamping portion 1-2 can correspond to a variety of structures and can be adjusted according to the production process and operating conditions.

[0047] For example, in some embodiments, the mounting hole 3-2 is a threaded hole, and the connector 4 is a screw. For example, the mounting hole 3-2 is a pin hole, and the connector 4 is a screw. In addition, when the mounting hole 3-2 is a polygonal hole, the connector 4 should be designed accordingly, such as a polygonal plug. In some embodiments, the limiting slot 1-3 can also be changed to a threaded hole, a pin hole, or a polygonal hole.

[0048] During assembly of this gate valve, after inserting the valve stem 2 into the center hole 1-1 of the valve cover 1, the thrust plug 3 is screwed in until the mounting hole 3-2 and the limiting groove 1-3 are coaxial, so that the positioning portion 3-1 is axially limited by the clamping portion 1-2, and the positioning portion 3-1 and the clamping portion 1-2 cooperate to form an undercut structure. Then, the connector 4 is installed along the limiting groove 1-3, and the connector 4 is connected to the positioning portion 3-1 through the mounting hole 3-2. The connector 4 is fixed and fixed to the clamping portion 1-2 through the limiting groove 1-3, so that the thrust plug 3 and the valve cover 1 are connected as a whole.

[0049] Furthermore, in some embodiments, a friction-resistant member 6 or a wear-resistant lubricating component is disposed between the top surface of the clamping portion 1-2 and the inner top surface of the valve cover 1. In some embodiments, a friction-resistant member 6 or a wear-resistant lubricating component is disposed between the bottom surface of the clamping portion 1-2 and the top surface of the thrust plug 3. In some embodiments, a friction-resistant member 6 or a wear-resistant lubricating component is disposed between the top surface of the clamping portion 1-2 and the inner top surface of the valve cover 1, and between the bottom surface of the clamping portion 1-2 and the top surface of the thrust plug 3. When a friction-resistant member 6 is selected, the friction-resistant member 6 includes, but is not limited to, an annular friction-resistant sheet.

[0050] Specifically in this embodiment, Figure 3 As shown, anti-friction parts 6 are provided between the top surface of the clamping part 1 - 2 and the inner top surface of the valve cover 1 , and between the bottom surface of the clamping part 1 - 2 and the top surface of the thrust plug 3 .

[0051] Furthermore, in some embodiments, in order to improve the sealing between the thrust plug 3 and the valve stem 2, a first sealing member 5-a is provided between the valve stem 2 and the thrust plug 3. The first sealing member 5-a includes but is not limited to a flexible sealing ring to achieve soft sealing of the gate valve.

[0052] In this embodiment, if Figure 3 As shown, an annular groove is provided on the circumferential surface of the valve stem 2 , the inner side of the first sealing member 5 - a is sealingly embedded in the annular groove, and the outer side of the first sealing member 5 - a contacts and seals with the thrust plug 3 .

[0053] In other embodiments, an annular groove may be provided on the inner wall of the thrust plug 3 , and the outer side of the sealing ring may be sealed in the annular groove, so that the inner side of the first sealing member 5 - a contacts and seals with the circumferential surface of the valve stem 2 .

[0054] Furthermore, a second sealing member 5-b is provided between the outer peripheral wall of the thrust plug 3 and the inner wall of the center hole 1-1 of the valve cover 1. The second sealing member 5-b includes but is not limited to a flexible sealing ring. The provision of the second sealing member 5-b can achieve a soft seal between the thrust plug 3 and the valve cover 1.

[0055] Furthermore, in order to achieve a stable connection between the valve stem 2 and the valve disc 8 in the gate valve, the lower end of the valve stem 2 is threadedly connected with a valve stem nut 7, and the valve disc 8 and the valve stem nut 7 in the gate valve are detachably connected.

[0056] like Figure 4 As shown, in this embodiment, a T-shaped slot 8-1 extending laterally through the upper end of the valve disc 8 is provided, and a protrusion 7-1 is formed on the outer periphery of the valve stem nut 7, which engages with the T-shaped slot 8-1. In other embodiments, the valve disc 8 and the valve stem nut 7 may also be connected by a latch connection, a snap connection, or any other feasible detachable connection scheme.

[0057] In some embodiments, the thrust cock 3 is an integral hot stamping part. The thrust cock 3 is formed by integral hot stamping, which can avoid secondary processing and is conducive to improving production efficiency.

[0058] In some embodiments, the valve cover 1 and the clamping portion 1-2 are integrally formed; this forming method can help improve production efficiency, as well as improve structural strength and stability, and reduce the risk of breakage or damage of the clamping portion 1-2 during use.

[0059] In some embodiments, the lower end of the valve cover 1 is uniformly provided with countersunk holes for connecting with the valve body 9 .

[0060] In some embodiments, the valve cover 1 and the valve body 9 are made of cast iron, that is, the valve cover 1 and the valve body 9 are cast iron parts.

[0061] In some embodiments, in order to increase the service life, the inner and outer walls of the valve cover 1 and the valve body 9 are subjected to plastic spraying. The valve cover 1 and the valve body 9 under this treatment do not need to undergo other processing, are not easy to rust, have a long service life and are low in cost.

[0062] To facilitate understanding of the assembly principle of this gate valve, the following shows an assembly scheme for this gate valve. The general steps are as follows:

[0063] First, insert the thrust plug 3 from the bottom of the valve stem 2, and then put the first seal 5-a, the second seal 5-b, and the anti-friction member 6 on the valve stem 2. The assembled valve stem 2 is as follows: Figure 8 shown.

[0064] Then, the valve stem 2 is installed into the valve cover 1, and the positioning portion 3-1 of the thrust plug 3 is adjusted to be axially misaligned with the limiting portion 2-1. The thrust plug 3 is then pushed inward axially to move through the clamping portion 1-2 until the thrust plug 3 abuts against the limiting portion 2-1 of the valve stem 2 and is positioned inside the valve cover 1. The thrust plug 3 is then rotated to rotate the positioning portion 3-1 on the thrust plug 3 into the axial gap between the clamping portion 1-2 and the inner wall of the valve cover 1, so that the positioning portion 3-1 is axially limited inside the valve cover 1 by the clamping portion 1-2.

[0065] After the thrust plug 3 is screwed in, the connector 4 is installed and the thrust plug 3 is locked in the valve cover 1 through the connector 4. Then, the stem nut 7 is screwed into the bottom of the valve stem 2, and the valve disc 8 is installed on the stem nut 7. The valve cover 1 is then installed on the valve body 9 as a whole through the connecting bolts, thus completing the overall assembly of the gate valve.

[0066] It should be understood that expressions such as "include" and "may include" used in this application indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In this application, terms such as "include" and / or "have" may be interpreted as indicating a specific characteristic, number, operation, constituent element, component, or combination thereof, but may not be interpreted as excluding the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components, or combinations thereof.

[0067] It should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0068] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0069] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0070] It is easy for those skilled in the art to understand that the above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A gate valve, characterized in that: It comprises a valve cover (1), a valve stem (2), a thrust plug (3) and a connecting piece (4), wherein: The inner side wall of the valve cover (1) is protruded to form a clamping portion (1-2); The valve stem (2) passes through the valve cover (1), and a limiting portion (2-1) is formed on the circumference of the valve stem (2), and the limiting portion (2-1) is located on the inner side of the valve cover (1); The thrust cock (3) is sleeved on the outer periphery of the valve stem (2) and located inside the valve cover (1); the thrust cock (3) has a positioning portion (3-1) adapted to the clamping portion (1-2); The connecting piece (4) is detachably connected to the thrust cock (3) and the valve cover (1); When the positioning portion (3-1) and the limiting portion (2-1) are axially misaligned, the thrust plug (3) is moved axially, so that the thrust plug (3) can move through the clamping portion (1-2) to contact and limit the limiting portion (2-1) of the valve stem (2) inside the valve cover (1); When the thrust cock (3) abuts against the valve stem (2) to limit it inside the valve cover (1), the thrust cock (3) is rotated so that the positioning portion (3-1) can be axially limited inside the valve cover (1) by the clamping portion (1-2); When the positioning portion (3-1) is axially limited by the clamping portion (1-2), the connecting member (4) is installed, so that the thrust cock (3) can be locked in the valve cover (1).

2. The gate valve according to claim 1, wherein: A plurality of the clamping parts (1-2) are arranged at intervals along the circumferential direction of the inner wall of the valve cover (1), and a plurality of the positioning parts (3-1) are arranged corresponding to the number and position of the clamping parts (1-2).

3. The gate valve according to claim 1, wherein: A friction-resistant part (6) / a wear-resistant lubricating part is provided between the top surface of the clamping part (1-2) and the valve cover (1), and / or A friction-resistant part (6) / wear-resistant lubricating component is provided between the bottom surface of the clamping part (1-2) and the thrust cock (3).

4. The gate valve according to claim 1, wherein: A first sealing member (5-a) is provided between the valve stem (2) and the thrust cock (3).

5. The gate valve according to claim 1, wherein: A second sealing member (5-b) is provided between the outer peripheral wall of the thrust cock (3) and the inner side wall of the valve cover (1).

6. The gate valve according to claim 1, wherein: The positioning portion (3-1) is provided with a mounting hole (3-2) for connecting the connecting member (4), and the clamping portion (1-2) is provided with a limiting groove (1-3) for limiting the installation of the connecting member (4).

7. The gate valve according to any one of claims 1 to 6, characterized in that: The valve cover (1) is a cast iron part.

8. The gate valve according to any one of claims 1 to 6, characterized in that: The thrust cock (3) is an integral hot stamping part.

9. The gate valve according to any one of claims 1 to 6, characterized in that: The lower end of the valve stem (2) is threadedly connected to a valve stem nut (7), and the valve disc (8) of the gate valve is detachably connected to the valve stem nut (7).

10. The gate valve according to claim 9, wherein: The upper end of the valve flap (8) is provided with a T-shaped opening slot (8-1), and the outer periphery of the valve stem nut (7) is protruded to form a raised portion (7-1), which is engaged with the T-shaped opening slot (8-1).

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