Valve position indicating mechanism of large-diameter rising stem wedge type double-gate-disc gate valve

Abstract

The utility model relates to a valve position indicating mechanism of a large-diameter rising stem wedge type double-gate-disc gate valve. The valve position indicating mechanism comprises a valve position indicating board, a threaded guide sleeve, a guide nut, a radial positioning rod and an indicating block. The valve position indication board is fixedly arranged on the side portion of the gate valve stand column. The valve position indication board is provided with scale marks indicating the opening degree of the valve. The upper end of the stand column is connected with the valve electric device, and the lower end of the stand column is connected with the valve body. A through hole is formed in the side portion of the stand column and is adjacent to the valve position indicator. A valve thrust bearing sleeve is rotationally installed in the stand column, and the upper portion of the valve thrust bearing sleeve is connected with a rotating part of the valve electric device so as to achieve coaxial rotation. A connecting nut is arranged in the stand column and installed on the valve rod in a threaded mode, and the connecting nut and the valve rod are in spiral transmission. The connecting nut is coaxially and fixedly connected with the valve thrust bearing sleeve; and the upper part of the threaded guide sleeve is coaxially and fixedly connected with the lower part of the valve thrust bearing sleeve. The structure is simple, cost is low, and the valve state can be observed conveniently.

Description

Technical Field

[0001] This utility model belongs to the field of valve equipment technology, specifically relating to a valve position indicating mechanism for a large-diameter rising stem wedge double gate valve. Background Technology

[0002] Most large-diameter rising stem wedge gate valves on the market do not have a valve position indicator to show the valve's open position. This makes it impossible to accurately determine the valve's open position after installation on the pipeline. This is especially true when the valve body and valve actuator are shipped separately and assembled at the installation site. When adjusting the travel limit of the valve actuator's switch position, it is impossible to accurately determine the valve's closed position. The consequences of this are as follows:

[0003] 1. Improper valve closing position setting during valve commissioning, causing the valve to close too far, resulting in severe leakage and even damage to the valve body;

[0004] 2. If the valve is not set to the fully open position, the upper part of the gate inside the valve will jam against the inner cavity of the valve cover after the valve is opened, which may damage the valve cover structure in severe cases. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a valve position indicating mechanism for a large-diameter rising stem wedge double gate valve, which solves the technical problem that the gate position cannot be determined in traditional gate valves.

[0006] To solve the above problems, the technical solution of this utility model is: a valve position indicating mechanism for a large-diameter rising stem wedge type double gate valve, comprising:

[0007] A valve position indicator is fixedly installed on the side of the gate valve column, and has scale lines indicating the valve opening degree. The upper end of the column is connected to the valve electric actuator, and the lower end of the column is connected to the valve body. The valve stem is installed inside the column. A through hole is opened on the side of the column, adjacent to the valve position indicator. A valve thrust bearing sleeve is rotatably installed inside the column, and the upper part of the valve thrust bearing sleeve is connected to the rotating part of the valve electric actuator to achieve coaxial rotation. A connecting nut is installed inside the column, and the connecting nut is threaded onto the valve stem. The connecting nut is coaxially and fixedly connected to the valve thrust bearing sleeve.

[0008] The upper part of the threaded guide sleeve is coaxially and fixedly connected to the lower part of the valve thrust bearing sleeve;

[0009] The guide nut is threaded onto the threaded guide sleeve. A radial positioning rod is fixedly mounted on the guide nut, and an indicator block is fixedly mounted on the outer end of the radial positioning rod. An indicator line is set on the indicator block, which slides and is limited within the through hole along the axis of the column. The guide nut moves axially as the threaded guide sleeve rotates, and the radial positioning rod moves linearly together with the guide nut. When the indicator line is aligned with a certain scale line on the valve position indicator, it indicates that the valve is at the opening position represented by that scale line.

[0010] Preferably, the radial positioning rod is detachably and fixedly connected to the guide nut, and the indicator block is detachably and fixedly connected to the radial positioning rod.

[0011] Preferably, a limiting plate is fixedly installed on the outer periphery of the valve thrust bearing sleeve, and an upper thrust ball bearing and a lower thrust ball bearing are installed inside the column. The limiting plate is positioned between the upper thrust ball bearing and the lower thrust ball bearing to restrict the axial movement of the valve thrust bearing sleeve.

[0012] Preferably, the column has an annular partition, and the lower end of the lower thrust ball bearing abuts against the upper end of the annular partition; a transition plate is fixedly installed at the upper end of the column, and the upper end of the upper thrust ball bearing abuts against the transition plate; the transition plate is fixedly connected to the valve electric device by fasteners.

[0013] Preferably, a dust cover is provided on the outside of the column to cover the through hole; the indicator block is located inside the dust cover, which is made of transparent material.

[0014] Preferably, a limiting groove is provided on the side of the column, and the open end of the dustproof groove is fitted into the limiting groove.

[0015] Preferably, the inner wall of the dust cover is provided with a guide groove, and an elastic deformation block is fixedly provided on the indicator block, the elastic deformation block being slidably engaged in the guide groove.

[0016] Preferably, a mounting cover is detachably provided on the dust cover, and a mounting plate is fixedly provided inside the dust cover. A guide hole is provided on the mounting plate, and a threaded groove is provided on the indicator block. A limit screw is installed in the threaded groove, and the limit screw passes through the guide hole. The mounting plate is limited between the end of the indicator block and the end of the limit screw.

[0017] Preferably, the mounting cover is slidably attached to the dust cover.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] This utility model provides a valve position indicating mechanism for a large-diameter rising stem wedge-type double gate valve. After the valve passes the pressure test before leaving the factory, with the valve closed, the valve position indicating mechanism is adjusted so that the graduation line on the indicating block aligns with the 0% position graduation line on the indicating plate. During subsequent commissioning and use, this valve position indicating mechanism allows for accurate determination of the valve's open or closed position, and avoids valve damage caused by improper adjustment of the valve's electric actuator's travel limit. Attached Figure Description

[0020] Figure 1 This is a partial cross-sectional view of the internal structure of a large-diameter rising stem wedge double gate valve with a valve position indicator mechanism in the embodiment.

[0021] Figure 2 This is a structural diagram of the valve position indicating mechanism in the embodiment;

[0022] Figure 3 This is an enlarged view of the valve position indicator mechanism in the embodiment;

[0023] Figure 4 This is a schematic diagram of the dust cover installation in the embodiment. Figure 1 ;

[0024] Figure 5 This is a schematic diagram of the dust cover installation in the embodiment. Figure 2 .

[0025] Reference numerals: 1. Valve body; 2. Gate; 3. Valve stem; 5. Column; 51. Limit groove; 6. Valve position indicating mechanism; 7. Valve electric actuator; 8. Threaded guide sleeve; 9. Guide nut; 10. Radial positioning rod; 11. Indicator block; 12. Valve position indicator plate; 13. Hex socket head cap screw; 14. Annular partition; 15. Connecting nut; 16. Valve thrust bearing sleeve; 17. Upper thrust ball bearing; 171. Lower thrust ball bearing; 18. Transition plate; 19. Dust cover; 191. Guide groove; 192. Elastic deformation block; 193. Mounting cover; 194. Mounting plate; 195. Guide opening; 196. Threaded groove; 197. Limit screw. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Example 1: As Figures 1-4As shown, this embodiment provides a valve position indicating mechanism for a large-diameter rising stem wedge double gate valve, including a valve position indicator plate 12, a threaded guide sleeve 8, a guide nut 9, a radial positioning rod 10, and an indicator block 11. The valve position indicator plate 12 is fixedly installed on the side of the gate valve column 5, and has scale lines indicating the valve opening degree. The upper end of the column 5 is connected to a valve electric actuator 7, and the lower end of the column 5 is connected to the valve body 1. The valve stem 3 is installed inside the column 5. A through hole is opened on the side of the column 5, adjacent to the valve position indicator plate 12. A valve thrust bearing sleeve 16 is rotatably installed inside the column 5, and the upper part of the valve thrust bearing sleeve 16 is connected to the rotating part of the valve electric actuator 7 to achieve coaxial rotation. A connecting nut 15 is provided inside the column 5, and the connecting nut 15 is threaded... Mounted on valve stem 3, the connecting nut 15 is screwed to valve stem 3; the connecting nut 15 is coaxially fixedly connected to valve thrust bearing sleeve 16; the upper part of threaded guide sleeve 8 is coaxially fixedly connected to the lower part of valve thrust bearing sleeve 16; guide nut 9 is threadedly mounted on threaded guide sleeve 8, and radial positioning rod 10 is fixedly mounted on guide nut 9. Indicator block 11 is fixedly mounted on the outer end of radial positioning rod 10. Indicator line is set on indicator block 11. Indicator block 11 slides and is limited in the through hole along the axis of column 5; guide nut 9 moves axially with threaded guide sleeve 8 as it rotates, and radial positioning rod 10 moves linearly with guide nut 9; when indicator line is aligned with a certain scale line on valve position indicator plate 12, it indicates that the valve is in the opening position represented by that scale line.

[0028] With the above configuration, through holes are opened at corresponding positions on the outer surface of the column 5 of the large-diameter rising stem wedge double gate valve. The indicator block 11 slides up and down within the through hole, and the valve position indicator plate 12 is fixed around the through groove. The valve position indicating mechanism 6 consists of a threaded guide sleeve 8, a guide nut 9, a radial positioning rod 10, an indicator block 11, and a valve position indicator plate 12. The valve position indicating mechanism 6 is set as follows: Figure 1 The upper part of column 5 shown is enlarged in the following view. Figure 3 As shown. The indicator block 11 has horizontally arranged indicator lines on its surface; the valve position indicator plate 12 has the words "valve open" and "valve closed" engraved on its surface, as well as lines indicating the opening degree from 0% to 100%; the valve's open or closed position can be displayed by pointing the indicator line of the indicator block 11 to the opening percentage line on the valve position indicator plate 12. The structure is simple, the cost is low, and it is convenient to observe the valve's status.

[0029] In this embodiment, a valve position indicating mechanism for a large-diameter rising stem wedge-type double gate valve includes a toothed engagement at the bottom of the valve electric actuator 7 and a toothed engagement at the top of the valve thrust bearing sleeve 16. The connecting nut 15 and the valve thrust bearing sleeve 16 are connected by threads and tightly joined together by two connecting screws. A threaded guide sleeve 8 is fixed to the bottom of the valve thrust bearing sleeve 16 with an internal hexagonal screw 13. The threaded guide sleeve 8 has a standard thread on its exterior, the pitch of which is related to the stroke of the gate 2 and the lead of the trapezoidal thread on the exterior of the valve stem 3. The guide nut 9 has an internal thread with the same pitch as the threaded guide sleeve 8 and forms a helical drive with the threaded guide sleeve 8.

[0030] In the valve position indicating mechanism of a large-diameter rising stem wedge double gate valve in this embodiment, the valve stem 3 and the gate 2 are mechanically connected as one unit, and the gate 2 is disposed between two sealing surfaces inside the valve body 1.

[0031] The working principle is as follows: When the jaw of the valve electric actuator 7 rotates, it drives the valve thrust bearing sleeve 16 to rotate, which in turn drives the connecting nut 15 to rotate. Through the screw drive, the valve stem 3 and the gate 2 move linearly, realizing the relative movement of the gate 2 between the two sealing surfaces of the valve body 1. When the gate 2 is completely in contact with the sealing surface of the valve body 1, the valve is in the closed state. When the gate 2 is completely disengaged from the sealing surface of the valve body 1, the valve is in the open state. When the valve is in the closed position, adjust the position of the valve position indicator 12 so that its 0% scale line is aligned with the indicator line of the indicator block 11.

[0032] When the valve needs to be opened, the valve electric actuator 7 drives the valve thrust bearing sleeve 16 and the connecting nut 15 to rotate. Through the helical transmission between the connecting nut 15 and the valve stem 3, the valve stem 3 and the gate 2 are driven to move upward. At this time, the threaded guide sleeve 8 rotates on a fixed axis together with the valve thrust bearing sleeve 16. Since the guide nut 9 is restricted by the indicator block 11, it can only move in a straight line. Therefore, the guide nut 9 drives the indicator block 11 to move upward. The indicator line on the outer surface of the indicator block 11 moves towards the 100% direction of the valve position indicator plate 12 until the valve is fully opened and the indicator line reaches the 100% position.

[0033] When the valve needs to be closed, the valve electric actuator 7 drives the valve thrust bearing sleeve 16 and the connecting nut 15 to rotate. Through the helical transmission between the connecting nut 15 and the valve stem 3, the valve stem 3 and the gate 2 are driven to move downward. At this time, the threaded guide sleeve 8 rotates along with the valve thrust bearing sleeve 16 on a fixed axis. Since the guide nut 9 is restricted by the indicator block 11, it can only move in a straight line. Therefore, the guide nut 9 drives the indicator block 11 to move downward. The indicator line on the outer surface of the indicator block 11 moves towards the 0% direction of the valve position indicator plate 12 until the valve is fully closed and the indicator line reaches the 0% position.

[0034] The thread pitch of the threaded guide sleeve 8 and the guide nut 9 is related to the stroke of the gate 2 and the lead of the valve stem 3, that is, it is related to the number of turns of the valve stem 3. At the same time, its thread pitch is related to the distance between 0% and 100% on the valve position indicator 12.

[0035] In the valve position indicator mechanism of a large-diameter rising stem wedge double gate valve in this embodiment, the through hole can be a rectangular hole, and the valve position indicator plate 12 and the column 5 are riveted together as one piece, so the connection is stable.

[0036] In this embodiment of a large-diameter rising stem wedge-type double gate valve position indicating mechanism, the radial positioning rod 10 is detachably and fixedly connected to the guide nut 9, and the indicating block 11 is detachably and fixedly connected to the radial positioning rod 10. The structure is simple and easy to assemble and disassemble. Specifically, preferably, the radial positioning rod 10 is fixed to the guide nut 9 by a threaded connection, and the indicating block 11 and the radial positioning rod 10 are fixed as a whole by a set screw.

[0037] In the valve position indicating mechanism of a large-diameter rising stem wedge double gate valve in this embodiment, a limiting plate is fixedly installed on the outer periphery of the valve thrust bearing sleeve 16, and an upper thrust ball bearing 17 and a lower thrust ball bearing 171 are installed inside the column 5. The limiting plate is limited between the upper thrust ball bearing 17 and the lower thrust ball bearing 171 to restrict the axial movement of the valve thrust bearing sleeve 16.

[0038] In this embodiment, a valve position indicating mechanism for a large-diameter rising stem wedge-type double gate valve includes an annular partition 14 inside the column 5. The lower end of the lower thrust ball bearing 171 abuts against the upper end of the annular partition 14. A transition plate 18 is fixedly installed at the upper end of the column 5, and the upper end of the upper thrust ball bearing 17 abuts against the transition plate 18. The transition plate 18 is fixedly connected to the valve electric actuator 7 by fasteners. This arrangement improves the installation stability of the upper thrust ball bearing 17 and the lower thrust ball bearing 171.

[0039] In this embodiment, a large-diameter rising stem wedge-type double gate valve position indicator mechanism includes a dust cover 19 on the outside of the column 5 to cover the through hole; the indicator block 11 is located inside the dust cover 19, which is made of transparent material. The dust cover 19 prevents dust and other debris from entering the column 5 through the through hole and causing damage to the valve.

[0040] In this embodiment, a valve position indicating mechanism for a large-diameter rising stem wedge-type double gate valve includes a limiting groove 51 on the side of the column 5, with the open end of the dustproof groove fitting into the limiting groove 51. This enables rapid positioning of the dust cover 19 during installation, improving installation efficiency and accuracy.

[0041] In this embodiment of a large-diameter rising stem wedge-type double gate valve position indicating mechanism, a guide groove 191 is provided on the inner wall of the dust cover 19, and an elastically deformable locking block 192 is fixedly provided on the indicating block 11. The elastically deformable locking block 192 is slidably engaged in the guide groove 191. The elastically deformable locking block 192 and the guide groove 191 are slidably engaged, which plays a connecting and positioning role for the dust cover 19. The structure is simple. When the elastically deformable locking block 192 moves up and down with the indicating block 11, the elastically deformable locking block 192 slides in the guide groove 191. The cooperation between the elastically deformable locking block 192 and the guide groove 191 realizes the connection of the dust cover 19, which facilitates the installation and removal of the dust cover 19.

[0042] Example 2: Figure 5 As shown, this embodiment provides a valve position indicating mechanism for a large-diameter rising stem wedge-type double gate valve. The difference from Embodiment 1 lies in the structure of the dust cover 19. A detachable mounting cover 193 is installed on the dust cover 19, and a mounting plate 194 is fixedly installed inside the dust cover 19. A guide opening 195 is formed on the mounting plate 194, and a threaded groove 196 is formed on the indicating block 11. A limiting screw 197 is installed in the threaded groove 196, passing through the guide opening 195. The mounting plate 194 is positioned between the end of the indicating block 11 and the end of the limiting screw 197. During the installation of the dust cover 19, the mounting cover 193 is opened to expose the mounting plate 194. The opening of the dust cover 19 is inserted into the limiting groove 51. The limiting screw 197 passes through the guide opening 195 and is threaded into the threaded groove 196. Then, the mounting cover 193 is closed, completing the installation of the dust cover 19. The structure is simple and easy to assemble and disassemble.

[0043] In the valve position indicating mechanism of a large-diameter rising stem wedge-type double gate valve in this embodiment, the mounting cover 193 is slidably engaged with the dust cover 19. This arrangement facilitates the opening and closing of the mounting cover 193, improving operational efficiency.

[0044] The above description only describes the preferred embodiments of the present utility model. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model, and all such changes should be included within the protection scope of the present utility model.

Claims

1. A large bore, rising stem, wedge-type double gate valve position indicator mechanism characterized by, The utility model relates to a valve position indicating device, which comprises: a valve position indicating plate (12) fixedly arranged on the side of a valve stand (5) and provided with scale lines representing the opening degree of the valve; the upper end of the valve stand (5) is connected with a valve electric device (7), the lower end of the valve stand (5) is connected with a valve body (1), and the valve stem (3) is arranged in the valve stand (5); a through hole is formed in the side of the valve stand (5) and adjacent to the valve position indicating plate (12); a valve thrust bearing sleeve (16) is rotatably arranged in the valve stand (5), the upper part of the valve thrust bearing sleeve (16) is connected with the rotating part of the valve electric device (7) to realize coaxial rotation; the valve stand (5) is provided with a connecting nut (15) arranged in a threaded mode on the valve stem (3), and the connecting nut (15) is fixedly connected with the valve thrust bearing sleeve (16) in a coaxial mode; a threaded guide sleeve (8) is fixedly connected with the lower part of the valve thrust bearing sleeve (16) in a coaxial mode; a guide nut (9) is arranged in a threaded mode on the threaded guide sleeve (8), a radial positioning rod (10) is fixedly arranged on the guide nut (9), the outer end of the radial positioning rod (10) is fixedly provided with an indicating block (11), the indicating block (11) is provided with an indicating line, and the indicating block (11) is slidingly limited in the through hole along the axial direction of the valve stand (5); the guide nut (9) moves axially along with the rotation of the threaded guide sleeve (8), and the radial positioning rod (10) moves linearly along with the guide nut (9); when the indicating line is aligned with a scale line on the valve position indicating plate, the valve is in the opening degree position represented by the scale line.

2. A large port wedge gate double disc valve position indicator mechanism according to claim 1, characterized in that, The radial positioning rod (10) is detachably fixedly connected with the guide nut (9), and the indicating block (11) is detachably fixedly connected with the radial positioning rod (10).

3. A large port wedge gate double disc valve position indicator mechanism in accordance with claim 1 characterised in that, A limiting plate is fixedly arranged on the outer periphery of the valve thrust bearing sleeve (16), an upper thrust ball bearing (17) and a lower thrust ball bearing (171) are arranged in the valve stand (5), and the limiting plate is limited between the upper thrust ball bearing (17) and the lower thrust ball bearing (171) to limit the axial movement of the valve thrust bearing sleeve (16).

4. A large port wedge gate double disc valve position indicator mechanism in accordance with claim 3 characterized by, The valve stand (5) is provided with an annular partition plate (14), the lower end of the lower thrust ball bearing (171) abuts against the upper end of the annular partition plate (14); a transition disc (18) is fixedly arranged on the upper end of the valve stand (5), the upper end of the upper thrust ball bearing (17) abuts against the transition disc (18), and the transition disc (18) is fixedly connected with the valve electric device (7) through fasteners.

5. A large port wedge gate double disc valve position indicator mechanism in accordance with claim 1 characterized by, A dust cover (19) is arranged on the outer side of the valve stand (5) to cover the through hole; the indicating block (11) is located in the dust cover (19), and the dust cover (19) is made of transparent material.

6. A large port wedge gate double disc valve position indicator mechanism in accordance with claim 5 wherein, A limiting groove (51) is arranged on the side of the valve stand (5), and the opening end of the dust groove is embedded in the limiting groove (51) in a matched mode.

7. A large port wedge gate double disc valve position indicator mechanism as defined in claim 6 wherein, A guide clamping groove (191) is arranged on the inner wall of the dust cover (19), and an elastically deformed clamping block (192) is fixedly arranged on the indicating block (11) and slidingly clamped in the guide clamping groove (191).

8. A large port wedge gate double disc valve position indicator mechanism in accordance with claim 6 characterized by, A detachable mounting cover (193) is arranged on the dust cover (19), a mounting plate (194) is fixedly arranged in the dust cover (19), a guide hole (195) is formed on the mounting plate (194), a threaded groove (196) is formed on the indicating block (11), a limiting screw (197) is mounted in the threaded groove (196), the limiting screw (197) passes through the guide hole (195), and the mounting plate (194) is limited between the indicating block (11) and the end of the limiting screw (197).

9. A large port wedge gate double disc valve position indicator mechanism as defined in claim 8 wherein, The mounting cover (193) is slidably clamped on the dust cover (19).

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