All-welded ball valve

Abstract

According to the all-welded ball valve, supporting plates are rotationally installed on protruding columns at the upper end and the lower end of a ball body, a left valve shell and a right valve shell which are distributed on the two sides of the ball body are in pin joint with the two supporting plates into a whole, and sealing structures arranged in the left valve shell and the right valve shell are in matched sealing with the corresponding sides of the ball body respectively. The valve bodies located above and below the ball body are fixedly connected with the left valve shell and the right valve shell into a whole in a matched mode, the lower end of the valve rod is connected with an upper valve cover through a lubricating sealing device, the lower end of the upper valve cover is connected to a center hole of the valve body above the ball body in a sealed mode, and the lower end of the valve rod is connected with a square hole in the upper end of the ball body in a matched mode. And the flange connecting plate, the upper valve cover and the valve body above the ball body are fixedly connected into a whole. According to the all-welded ball valve, the defect that sealing and rotating are laborious and unsmooth in a traditional connecting structure is overcome, reliable sealing of the valve rod and the upper valve cover is guaranteed, meanwhile, the ball body is smooth and not blocked in the rotating process, and the service life of the all-welded ball valve is greatly prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and in particular relates to a fully welded ball valve. Background Art

[0002] Fully welded ball valves are key valves in oil and gas pipelines, and their localization holds significant social and economic significance. In existing fully welded ball valves, the connection between the bonnet and the stem is characterized by a simple structure, easy processing, and ease of assembly. However, this structure suffers from poorly designed connections and seals, leading to poor stem rotation during operation. This directly impacts the valve's overall performance, necessitating improvements to address these issues. Utility Model Content

[0003] The technical problem solved by the present invention is as follows: a fully welded ball valve is provided, the sealing structure of the connection position between the valve stem and the upper valve cover is optimized, the lower end of the valve stem is connected to the upper valve cover whose lower end is sealed and connected to the center hole of the valve body above the sphere through a lubricating sealing device, and the two support plates are rotatably installed on the convex columns at the upper and lower ends of the sphere, which ensures the reliable sealing of the valve stem and the upper valve cover while making the sphere rotate smoothly without getting stuck, solving the disadvantage of the traditional connection structure that the sealing is difficult and not smooth during rotation, with a simple structure and reasonable design. The lubricating sealing device with lubrication function greatly improves the service life of the fully welded ball valve.

[0004] The technical solution adopted by the present utility model is as follows: a fully welded ball valve, comprising a left valve housing, a right valve housing, a ball and a valve stem, support plates are rotatably mounted on the convex columns at the upper and lower ends of the ball, and the left valve housing and the right valve housing distributed on both sides of the ball are pin-connected to the two support plates as one, the sealing structures arranged inside the left valve housing and the right valve housing are respectively adapted to seal with the corresponding sides of the ball, and the valve body located above and below the ball is adapted to be fixedly connected to the left valve housing and the right valve housing as one, the lower end of the valve stem is connected to the upper valve cover which is sealed and connected to the center hole of the valve body above the ball through a lubricating sealing device, and the lower end of the valve stem is adapted to be connected to the square hole at the upper end of the ball, a flange connecting plate which is sleeved on the valve stem is provided above the upper valve cover, and the flange connecting plate, the upper valve cover and the valve body above the ball are fixedly connected as one.

[0005] Among them, the convex columns at the upper and lower ends of the sphere are provided with thrust bearings, and the support plate is rotatably connected to the convex columns of the sphere through the thrust bearings.

[0006] Furthermore, the lubricating sealing device includes a packing pressure ring, a fireproof sealing ring and an O-ring. The sealing groove formed by the open ring groove at the upper edge of the inner hole wall of the upper valve cover and the open ring groove at the lower edge of the inner hole wall of the flange connecting plate is provided with a packing pressure ring and a fireproof sealing ring from top to bottom that are in contact with the outer wall of the valve stem. A lubrication ring groove is provided in the middle of the inner hole wall of the upper valve cover, an oil hole vertically connected to the lubrication ring groove is provided in the middle of the outer wall of the upper valve cover, and a grease valve is connected to the oil hole orifice. Two sealing ring grooves are provided on the inner hole wall of the upper valve cover below the lubrication ring groove, and the O-ring adapted to be installed in the sealing ring groove is in contact with the outer wall of the valve stem at the corresponding position.

[0007] Furthermore, sealing rings are provided on the outer wall of the small diameter section at the lower end of the upper valve cover and the step surface formed by the large diameter section and the small diameter section of the upper valve cover, which are in contact with the valve body hole wall and the upper end surface above the sphere respectively.

[0008] Furthermore, the valve stem is a multi-step shaft structure, and a thrust bearing in contact with the lower end surface of the upper valve cover is provided on the step surface of the upper end of the large diameter section of the valve stem.

[0009] Furthermore, a thrust bearing is provided between the lower end of the valve stem and the support plate below the sphere.

[0010] Furthermore, the flange connecting plate, the upper valve cover and the valve body above the sphere are fixedly connected as a whole by countersunk bolts.

[0011] The advantages of this utility model compared with the prior art are:

[0012] 1. This technical solution optimizes the sealing structure at the connection between the valve stem and the upper valve cover, so that the lower end of the valve stem is connected to the upper valve cover whose lower end is sealed and connected to the center hole of the valve body above the ball through a lubricating sealing device, and the two support plates are rotatably installed on the convex columns at the upper and lower ends of the ball. This ensures a reliable seal between the valve stem and the upper valve cover, while allowing the ball to rotate smoothly without getting stuck. This solves the problem of the traditional connection structure that the seal is difficult and not smooth during rotation. In addition, the lubricating sealing device with lubrication function reduces the friction between the valve stem and the upper valve cover, thereby increasing the service life of the fully welded ball valve.

[0013] 2. This technical solution provides thrust bearings on the convex columns at the upper and lower ends of the sphere, so that the support plate is rotatably connected to the convex columns of the sphere through the thrust bearings, so that this position can withstand a large axial load, reduce friction, and improve stability in the vehicle.

[0014] 3. This technical solution provides reliable rotational support conditions for the ball and upper valve cover by arranging thrust bearings between the upper valve cover and the valve stem step surface and between the lower end of the ball and the support plate, thereby increasing radial and axial load-bearing capacity, reducing friction, and improving the working performance of the fully welded ball valve;

[0015] 4. This technical solution has a simple structure, reasonable design, low cost, and the lubricating sealing device with lubrication function greatly improves the service life of the fully welded ball valve and has high use value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the utility model;

[0017] Figure 2 for Figure 1 Middle AA section view. DETAILED DESCRIPTION

[0018] The following is a combination of the embodiments of the present invention Figure 1-2 The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0019] It should be noted that, in this document, unless otherwise stated, it should be understood that the terms "center," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate positions or relationships based on those shown in the accompanying drawings. These are intended only to facilitate the description of the present invention and simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] As used herein, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the elements.

[0021] Fully welded ball valves, such as Figure 1As shown, it includes a left valve housing 1, a right valve housing 2, a ball 3 and a valve stem 4, and support plates 5 are rotatably mounted on the convex columns at the upper and lower ends of the ball 3, and the left valve housing 1 and the right valve housing 2 distributed on both sides of the ball 3 are pinned together with the two support plates 5. The sealing structures 9 arranged inside the left valve housing 1 and the right valve housing 2 are respectively adapted to seal with the corresponding sides of the ball 3, and the valve body 6 located above and below the ball 3 is adapted to be fixedly connected to the left valve housing 1 and the right valve housing 2 as a whole, the lower end of the valve stem 4 is connected to the upper valve cover 7 of the center hole of the valve body 6 above the ball 3 through a lubricating sealing device, and the lower end of the valve stem 4 is adapted to be connected with the square hole at the upper end of the ball 3, and a flange connection sleeved on the valve stem 4 is provided above the upper valve cover 7. Plate 8, and the flange connecting plate 8, the upper valve cover 7 and the valve body 6 above the ball 3 are fixedly connected as a whole; in the above structure, the sealing structure of the connection position between the valve stem 4 and the upper valve cover 7 is optimized, so that the lower end of the valve stem 4 is connected to the upper valve cover 7 whose lower end is sealed and connected to the central hole 6 above the ball 3 through a lubricating sealing device, and the two support plates 5 are rotatably installed on the convex columns at the upper and lower ends of the ball 3, ensuring the reliable sealing of the valve stem 4 and the upper valve cover 7, so that the ball 3 can rotate smoothly without getting stuck, solving the disadvantage of the traditional connection structure that the sealing is difficult and not smooth during rotation, and the lubricating sealing device with lubrication function reduces the friction between the valve stem 4 and the upper valve cover 7, thereby improving the service life of the fully welded ball valve;

[0022] Among them, thrust bearings 10 are provided on the convex columns at the upper and lower ends of the sphere 3, and the support plate 5 is rotatably connected to the convex columns of the sphere 3 through the thrust bearings 10; in the above structure, by providing thrust bearings 10 on the convex columns at the upper and lower ends of the sphere 3, the support plate 5 is rotatably connected to the convex columns of the sphere 3 through the thrust bearings 10, so that this position can withstand a large axial load, reduce friction, and improve stability in the vehicle.

[0023] like Figure 2 As shown, the specific structure of the lubricating sealing device is as follows: the lubricating sealing device includes a packing pressure ring 11, a fireproof sealing ring 12 and an O-ring 13. The sealing groove formed by the open ring groove at the upper edge of the inner hole wall of the upper valve cover 7 and the open ring groove at the lower edge of the inner hole wall of the flange connecting plate 8 is provided with a packing pressure ring 11 and a fireproof sealing ring 12 in contact with the outer wall of the valve stem 4 from top to bottom. The middle part of the inner hole wall of the upper valve cover 7 is provided with a lubricating ring groove 14, and the middle part of the outer wall of the upper valve cover 7 is provided with a An oil hole is vertically connected to the lubrication ring groove 14, and a grease valve 15 is connected to the oil hole orifice. Two sealing ring grooves are provided on the inner hole wall of the upper valve cover 7 below the lubrication ring groove 14, and the O-ring 13 adapted to be installed in the sealing ring groove is in contact with the outer wall of the corresponding position of the valve stem 4; specifically, the outer wall of the small-diameter section at the lower end of the upper valve cover 7 and the step surface formed by the large-diameter section and the small-diameter section of the upper valve cover 7 are provided with sealing rings that are in contact with the hole wall and the upper end face of the valve body 6 above the sphere 3 respectively.

[0024] Among them, the valve stem 4 is a multi-step stepped shaft structure, and a thrust bearing 10 is provided on the stepped surface of the upper end of the large-diameter section of the valve stem 4, which contacts the lower end surface of the upper valve cover 7; specifically, a thrust bearing 10 is provided between the lower end of the valve stem 4 and the support plate 5 below the ball 3; specifically, the flange connecting plate 8, the upper valve cover 7 and the valve body 6 above the ball 3 are fixedly connected as a whole by countersunk bolts; in the above structure, by providing the thrust bearing 10 between the upper valve cover 7 and the stepped surface of the valve stem 4 and between the lower end of the ball 3 and the support plate 5, reliable rotation support conditions are provided for the ball 3 and the upper valve cover 7, thereby improving the radial and axial load-bearing capacity, reducing friction, and improving the working performance of the fully welded ball valve;

[0025] This technical solution has a simple structure, reasonable design, and low cost. The lubricating sealing device with lubrication function greatly increases the service life of the fully welded ball valve and has high use value.

[0026] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved. In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. Fully welded ball valve, characterized by: The invention comprises a left valve housing (1), a right valve housing (2), a sphere (3) and a valve stem (4); support plates (5) are rotatably mounted on the convex columns at the upper and lower ends of the sphere (3); the left valve housing (1) and the right valve housing (2) distributed on both sides of the sphere (3) are pin-connected to the two support plates (5) as a whole; the sealing structures (9) provided inside the left valve housing (1) and the right valve housing (2) are respectively adapted to seal with the corresponding sides of the sphere (3); and the valve body (6) located above and below the sphere (3) is connected to the left valve housing. (1) and the right valve housing (2) are adapted and fixedly connected as one body, the lower end of the valve stem (4) is connected to the upper valve cover (7) whose lower end is sealed and connected to the center hole of the valve body (6) above the sphere (3) through a lubricating sealing device, and the lower end of the valve stem (4) is adapted and connected to the square hole at the upper end of the sphere (3), a flange connecting plate (8) which is sleeved on the valve stem (4) is provided above the upper valve cover (7), and the flange connecting plate (8), the upper valve cover (7) and the valve body (6) above the sphere (3) are fixedly connected as one body.

2. The fully welded ball valve according to claim 1, characterized in that: Thrust bearings (10) are provided on the convex columns at the upper and lower ends of the sphere (3), and the support plate (5) is rotatably connected to the convex columns of the sphere (3) through the thrust bearings (10).

3. The fully welded ball valve according to claim 1, characterized in that: The lubricating sealing device comprises a packing pressure ring (11), a fireproof sealing ring (12) and an O-type sealing ring (13); a packing pressure ring (11) and a fireproof sealing ring (12) in contact with the outer wall of the valve stem (4) are provided from top to bottom in the sealing groove formed by the open ring groove at the upper edge of the inner hole wall of the upper valve cover (7) and the open ring groove at the lower edge of the inner hole wall of the flange connecting plate (8); a lubricating ring groove (14) is provided in the middle of the inner hole wall of the upper valve cover (7); an oil hole vertically connected to the lubricating ring groove (14) is provided in the middle of the outer wall of the upper valve cover (7), and a grease valve (15) is connected to the orifice of the oil hole; two sealing ring grooves located below the lubricating ring groove (14) are provided on the inner hole wall of the upper valve cover (7), and the O-type sealing ring (13) adapted to be installed in the sealing ring groove contacts the outer wall of the valve stem (4) at the corresponding position.

4. The fully welded ball valve according to claim 3, characterized in that: The outer wall of the small diameter section at the lower end of the upper valve cover (7) and the stepped surface formed by the large diameter section and the small diameter section of the upper valve cover (7) are both provided with sealing rings that respectively contact the hole wall and the upper end surface of the valve body (6) above the sphere (3).

5. The fully welded ball valve according to claim 1, characterized in that: The valve stem (4) is a multi-step shaft structure, and a thrust bearing (10) in contact with the lower end surface of the upper valve cover (7) is provided on the upper step surface of the large diameter section of the valve stem (4).

6. The fully welded ball valve according to claim 5, characterized in that: A thrust bearing (10) is provided between the lower end of the valve stem (4) and the support plate (5) below the sphere (3).

7. The fully welded ball valve according to any one of claims 1 to 6, characterized in that: The flange connecting plate (8), the upper valve cover (7) and the valve body (6) above the sphere (3) are fixedly connected as a whole by countersunk bolts.

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