Valve pressure flange limiting device

Abstract

A valve pressing flange limiting device comprises a limiting piece and a fixing block, the limiting piece is correspondingly installed on a pressing flange, the fixing block is arranged on a valve body, the limiting piece and the fixing block are correspondingly matched to limit rotation of the pressing flange, the limiting piece comprises a limiting ring and a limiting block, the limiting ring is in a ring shape with a polygonal inner ring, the limiting ring is correspondingly arranged outside the pressing flange in a sleeving mode, and the limiting block is arranged on the limiting ring. The limiting block is arranged on one side of the limiting ring, the upper end of the inner side of the limiting block is fixedly connected to the outer side face of the limiting ring, the fixing block is arranged below the limiting ring, and the lower end of the limiting block extends towards the lower portion of the limiting ring to be correspondingly matched with the fixing block. The sealing stability of the pressing flange is improved, and the using performance of the valve body is further improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and in particular relates to a fixing device for limiting the rotation of a pressure flange on a valve stem. Background Art

[0002] A valve is a pipe fitting used to open and close pipes, control flow direction, and adjust and control the parameters (temperature, pressure, and flow) of the conveying medium. A ball valve is a type of valve whose plug body is a sphere with a circular through hole or channel on the axis of the sphere. A ball valve is a valve in which the valve stem drives the sphere to rotate around its axis. In a pipe, a ball valve is mainly used to cut off, distribute, and change the flow direction of the medium. It only needs to use a very small torque to rotate the sphere to close the pipe tightly. It is most suitable for use as a switch or cut-off valve.

[0003] The flange is a common and important component on valves. Taking a ball valve as an example, the flange is arranged above the valve body, and its lower end is detachably sealed and connected to the valve body. The connection between the two is generally a threaded connection. The main function of the flange is to ensure that the medium in the valve does not leak outward along the valve stem above the valve body when the valve core moves up and down, thereby enhancing the sealing effect above the valve body. However, a certain vibration will be generated when the medium inside the valve passes through. After a period of use, the connection between the flange and the valve body will become loose due to the long-term vibration of the medium passing through the valve body. Taking a flange with a threaded connection as an example, the flange will rotate in the direction of loosening the engagement with the valve body under long-term vibration, thereby reducing the sealing of the valve stem above the valve body, making the medium in the valve have the risk of leakage along the valve stem. Utility Model Content

[0004] The utility model aims to provide a fixing device for limiting the rotation of a flange on a valve stem, so as to solve the technical problem that the flange of the existing valve becomes loose due to long-term use, thereby affecting the sealing performance thereof.

[0005] To achieve the above purpose, the specific technical solution of the utility model is as follows:

[0006] A valve flange limit device comprises a limit plate and a fixed block, wherein the limit plate is correspondingly installed on the flange, the fixed block is arranged on the valve body, and the limit plate and the fixed block cooperate to limit the rotation of the flange.

[0007] Furthermore, the limiting plate includes a limiting ring and a limiting block, wherein the limiting ring is a ring with a polygonal inner ring, which is correspondingly mounted on the outside of the pressure flange, and its inner ring is correspondingly meshed with the outer ring of the pressure flange. The limiting block is arranged on one side of the limiting ring, and its inner upper end is fixedly connected to the outer surface of the limiting ring. The fixed block is arranged below the limiting ring, and the lower end of the limiting block extends to the bottom of the limiting ring and corresponds to the fixed block.

[0008] Furthermore, the pressure flange includes a ring step and a pressure tube, wherein the pressure tube is a tube with a hollow interior, and the pressure flange is sleeved on the valve stem at the upper opening of the valve body through the pressure tube, and the lower end of the pressure tube extends into the upper opening of the valve body to connect the two together accordingly, and the top surface of the pressure tube extends outward in a direction perpendicular to the axis to form a ring step, and the outer ring of the ring step is a prism with multiple edges, and the limit ring is correspondingly sleeved on the outer ring of the ring step.

[0009] Furthermore, the fixed block is arranged on the valve body below the pressure flange, and its inner side surface is fixedly connected to the outer side wall of the valve body. It is located on the side corresponding to the loosening direction of the limit block and the pressure flange, and its front side end is against the corresponding side surface of the lower end of the limit block.

[0010] Furthermore, a pair of corresponding fixing blocks are provided on the left and right sides of the limiting block.

[0011] Furthermore, the top surface of the limit block is not higher than the upper surface of the limit ring, and the upper surface of the limit ring is not higher than the upper surface of the pressure flange, and the top of the fixed block is not higher than the top surface of the upper opening of the valve.

[0012] Furthermore, the number of inner edges of the limiting ring is not less than the number of outer edges of the ring step, and the two correspond to each other in multiples.

[0013] The flange limiter of the valve of the utility model positions the flange in the circumferential direction through the cooperation of the limiter plate and the fixed block, thereby improving the stability of the flange, making the corresponding installation with the valve body still stable under long-term vibration, improving the sealing stability of the flange, and further improving the performance of the valve body, reducing the frequency of its maintenance, increasing its service life, and improving its economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 It is a schematic diagram of the top view structure of the utility model;

[0016] Figure 3 It is a cross-sectional view of the utility model;

[0017] Explanation of the markings in the figure: 1. Limiting piece; 11. Limiting ring; 12. Limiting block; 2. Fixing block; 3. Pressure flange; 31. Ring step; 32. Pressure tube; 4. Valve body; 41. Valve stem. DETAILED DESCRIPTION

[0018] In order to better understand the purpose, structure and function of the utility model, a valve flange limit device of the utility model is further described in detail below in conjunction with the accompanying drawings.

[0019] like Figure 1-3As shown, the limiting device of the valve pressure flange 3 of the utility model includes a limiting plate 1 and a fixing block 2, wherein the limiting plate 1 is correspondingly installed on the pressure flange 3, and the fixing block 2 is arranged on the valve body 4, and the rotation of the pressure flange 3 is limited by the corresponding cooperation of the limiting plate 1 and the fixing block 2, thereby reducing the risk of loosening due to long-term use.

[0020] The limiting piece 1 includes a limiting ring 11 and a limiting block 12, wherein the limiting ring 11 is annular and corresponds to the pressure flange 3, and is sleeved on the outside of the pressure flange 3. The inner ring of the limiting ring 11 is a polygonal hole, which corresponds to the outer ring of the pressure flange 3. When in use, the inner ring of the limiting ring 11 and the outer ring of the pressure flange 3 are meshed with each other. A limiting block 12 is provided on one side of the limiting ring 11. The height of the limiting block 12 is greater than the thickness of the limiting ring 11. The inner upper end of the limiting block 12 is connected to the outer surface of the limiting ring 11. In this embodiment, the limiting ring 11 is radially viewed from the outside. The outer side surface is circular, and the inner side of the limit block 12 is an arc corresponding to the outer side surface of the limit ring 11. The upper end of the inner side surface of the limit block 12 is attached to the outer side surface of one side of the limit ring 11, and the two are integrally formed and fixedly connected, wherein the top surface of the limit block 12 is not higher than the upper surface of the limit ring 11. In this embodiment, the two are on the same plane, and the bottom end of the limit block 12 extends below the limit ring 11. The fixed block 2 is arranged below the limit ring 11, and the lower end of the limit block 12 corresponds to the fixed block 2 below the limit block 12.

[0021] The pressure flange 3 is sleeved on the valve stem 41 at the upper end of the valve body 4, and includes a ring step 31 and a pressure tube 32, wherein the pressure tube 32 is a hollow tube with an inner diameter corresponding to the valve stem 41. The pressure flange 3 is sleeved on the valve stem 41 through the pressure tube 32, and then installed corresponding to the valve stem 41. The outer diameter of the pressure tube 32 corresponds to the upper end of the valve body 4. The pressure flange 3 extends into the upper end of the valve body 4 through the lower end of the pressure tube 32 to connect the two together accordingly. In this embodiment, the pressure tube 32 and the valve body 4 are connected together by corresponding threads. The top surface of the pressure tube 32 extends outward in a direction perpendicular to the axis to form an annular boss. This boss is the ring step 31. The outer ring of the ring step 31 is a prism with multiple edges. The inner ring of the limit ring 11 corresponds to the outer ring of the ring step 31, and it is sleeved on the outer ring of the ring step 31.

[0022] The fixed block 2 is arranged on the valve body 4 below the pressure flange 3, and its inner side surface is fixedly connected to the outer side wall of the valve body 4. When the pressure flange 3 and the valve body 4 are in a tightened state, the fixed block 2 is on the side corresponding to the loosening direction of the limit block 12 and the pressure flange 3, and the bottom end of the limit block 12 is lower than the top surface of the fixed block 2, the front side end of the fixed block 2 is against the corresponding side surface of the lower end of the limit block 12, and the top end of the fixed block 2 is not higher than the top surface of the upper opening of the valve body 4.

[0023] A corresponding pair of fixed blocks 2 are provided on the left and right sides of the limit block 12. The two fixed blocks 2 are symmetrically distributed on the left and right sides, and their inner sides are respectively connected to the outer walls of the valve body 4 on both sides of the limit block 12. The fixed blocks 2 are arranged in pairs so that they can better limit the rotation of the pressure flange 3 to both sides through the limit plate 1.

[0024] The number of edges of the inner circle hole of the limit ring 11 corresponds to the number of edges of the outer circle of the ring step 31 of the pressure flange 3. The number of edges of the inner circle of the limit ring 11 is not less than the number of edges of the outer circle of the ring step 31, and the two are in a multiple relationship. In this embodiment, the outer circle of the ring step 31 adopts a hexagonal shape. The multi-deformation design of the ring step 31 facilitates the corresponding installation and disassembly between the pressure flange 3 and the valve body 4. The inner circle of the limit ring 11 adopts a dodecagonal design, which facilitates the corresponding engagement of the limit ring 11 and the pressure flange 3. At the same time, the limit ring 11 of the same specification can also be applicable to pressure flanges 3 of various specifications, which makes the application range of the limit plate 1 wider.

[0025] The upper surface of the limiting ring 11 is not higher than the upper surface of the pressure flange 3 , so that the limiting plate 1 will not affect the normal operation of the flange component above the pressure flange 3 .

[0026] When in use, first install the pressure flange 3, the valve body 4 and the various components inside the valve body 4 accordingly, and tighten the threaded connection between the pressure flange 3 and the valve body 4, then put the limit plate 1 on the outer ring of the pressure flange 3, the polygonal inner ring of the limit plate 1 is meshed with the outer wall of the ring step 31 of the pressure flange 3, and the limit block 12 is inserted between the two corresponding fixed blocks 2. The installation of the limit device is completed. At this time, when the pressure flange 3 rotates, the limit plate 1 engaged with its outer ring prevents its rotation under the cooperation of the fixed block 2, thereby fixing the pressure flange 3 in the circumferential direction, so that it will not change its relative position with the valve body 4 at will.

[0027] The limiting device of the valve pressure flange 3 of the utility model positions the pressure flange 3 through the cooperation of the limiting plate 1 and the fixing block 2, so that the corresponding installation between the pressure flange 3 and the valve body 4 is more stable, and the probability of the pressure flange 3 loosening due to long-term use is reduced, so that the sealing stability of the upper part of the valve body 4 is better, thereby improving the use performance of the valve body 4, increasing the service life of the corresponding valve body 4, reducing the frequency of its maintenance, and making it more economical.

[0028] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A valve flange limit device, characterized in that: It comprises a limiting plate (1) and a fixing block (2), wherein the limiting plate (1) is correspondingly mounted on the pressure flange (3), the fixing block (2) is arranged on the valve body (4), and the limiting plate (1) and the fixing block (2) cooperate to limit the rotation of the pressure flange (3); The limiting plate (1) comprises a limiting ring (11) and a limiting block (12), wherein the limiting ring (11) is a ring with a polygonal inner ring, which is correspondingly mounted on the outside of the pressure flange (3), and its inner ring is correspondingly meshed with the outer ring of the pressure flange (3); the limiting block (12) is arranged on one side of the limiting ring (11), and its inner upper end is fixedly connected to the outer surface of the limiting ring (11); the fixed block (2) is arranged below the limiting ring (11), and the lower end of the limiting block (12) extends below the limiting ring (11) and corresponds to the fixed block (2).

2. The valve flange limiting device according to claim 1, characterized in that: The pressure flange (3) comprises a ring step (31) and a pressure tube (32), wherein the pressure tube (32) is a tube type with a hollow interior, and the pressure flange (3) is sleeved on the valve stem (41) at the upper opening of the valve body (4) through the pressure tube (32), and the lower end of the pressure tube (32) extends into the upper opening of the valve body (4) to connect the two together accordingly, and the top surface of the pressure tube (32) extends outward in a direction perpendicular to the axis to form a ring step (31), and the outer ring of the ring step (31) is a prism with multiple edges, and the limit ring (11) is sleeved on the outer ring of the ring step (31) accordingly.

3. The valve flange limiting device according to claim 1, characterized in that: The fixing block (2) is arranged on the valve body (4) below the pressure flange (3), and its inner side surface is fixedly connected to the outer side wall of the valve body (4). It is located on the side corresponding to the loosening direction of the limit block (12) and the pressure flange (3), and its front side end abuts against the corresponding side surface of the lower end of the limit block (12).

4. The valve flange limiting device according to claim 3, characterized in that: A pair of corresponding fixing blocks (2) are provided on the left and right sides of the limit block (12).

5. The valve flange limiting device according to any one of claims 1 to 4, characterized in that: The top surface of the limit block (12) is not higher than the upper surface of the limit ring (11), and the upper surface of the limit ring (11) is not higher than the upper surface of the pressure flange (3), and the top end of the fixed block (2) is not higher than the top surface of the upper opening of the valve.

6. The valve flange limiting device according to claim 1, characterized in that: The number of inner edges of the limiting ring (11) is not less than the number of outer edges of the ring step (31), and the two correspond to each other in multiples.

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