Stop valve preventing rotation of the valve disc

Abstract

The utility model relates to the technical field of stop valve discloses a kind of stop valve to prevent valve flap rotation, comprising: valve body, valve flap and valve flap cover;Valve body is opened with the valve cavity for flowing medium, valve seat is installed in valve cavity, valve cover is installed on valve body;Valve stem is installed in valve cover;Valve stem is installed in valve cavity, valve flap is connected with valve stem, valve flap is driven to adhere or away from valve seat by valve stem to cut off or communicate valve cavity;One end of valve flap structure is fixedly connected with valve flap, other end is fixedly connected with valve stem.This structure prevents the unevenness of medium flow, drives valve flap to rotate, increases the wear of valve flap cover to valve stem.When high-speed or turbulent medium passes through valve, the risk that the traditional valve flap may rotate due to uneven impact of medium, leading to wear or sealing failure is eliminated.And by prohibiting rotation, significantly reduce the mechanical wear of valve stem, valve flap cover and valve flap, prolong the life of valve.

Description

Technical Field

[0001] This utility model relates to the field of gate valve technology, and specifically to a gate valve that prevents the valve disc from rotating. Background Technology

[0002] In conventional gate valve structures, the valve disc is typically opened and closed using a rotary valve stem design. Specifically, the operator rotates a handwheel, which drives the output shaft of the gearbox. This output shaft is usually connected to or integrated with a valve stem nut. The valve stem nut has a trapezoidal thread machined internally, which meshes with the trapezoidal thread on the outside of the valve stem. The valve stem itself is restricted from circumferential rotation by a specific guiding device, allowing only linear motion along its axial direction. Therefore, when the handwheel is rotated, the rotation of the valve stem nut is converted into linear up-and-down motion of the valve stem through the trapezoidal thread pair, thereby causing the valve disc, fixed to the end of the valve stem, to rise or fall, achieving the on / off control of the medium flowing through the valve cavity.

[0003] In existing technologies, the connection between the valve disc and the valve stem is generally designed to allow relative rotation. When the medium flows through the valve orifice at high speed, the instability of the flow may generate asymmetric fluid forces on the valve disc. In conventional rotatable valve disc designs, these forces easily drive the valve disc to rotate relative to the valve stem. This continuous, uncontrolled relative rotation significantly exacerbates the frictional wear between the seals on the valve disc and the valve stem contact surface, leading to premature seal failure, decreased sealing performance, and a shortened valve lifespan. Utility Model Content

[0004] In view of this, this utility model provides a gate valve to prevent valve disc rotation, addressing the common design of the connection between the valve disc and valve stem that allows relative rotation. While this design facilitates assembly and accommodates certain alignment deviations, it has significant drawbacks under specific operating conditions. When the medium flows through the valve orifice at high speed, the instability of the flow may generate asymmetrical fluid forces on the valve disc. In conventional rotatable valve disc designs, these forces easily drive the valve disc to rotate relative to the valve stem. This continuous, uncontrolled relative rotation significantly exacerbates frictional wear between the seals on the valve disc and the valve stem contact surface, leading to premature seal failure, decreased sealing performance, and a shortened valve lifespan.

[0005] In a first aspect, this utility model provides a shut-off valve to prevent valve disc rotation, comprising:

[0006] The valve body has a valve cavity for the flow of a medium, a valve seat is installed in the valve cavity, and a valve cover is installed on the valve body; the valve stem is installed in the valve cover.

[0007] The valve disc is connected to the valve stem and is moved by the valve stem to either conform to or move away from the valve seat to isolate or connect the valve cavity.

[0008] It also includes a valve cover, one end of which is fixedly connected to the valve disc and the other end of which is fixedly connected to the valve stem.

[0009] Beneficial effects: When the valve stem drives the valve disc upward away from the valve seat, allowing the medium to flow through the valve cavity, the valve stem is indirectly connected to the valve disc via the valve disc cover, and the two cannot rotate relative to each other. This prevents uneven medium flow from causing the valve disc to rotate and increasing wear on the valve stem. When high-speed or turbulent media pass through the valve, it eliminates the risk of traditional valve discs rotating due to uneven media impact, leading to wear or seal failure. Furthermore, by preventing rotation, it significantly reduces mechanical wear on the valve stem, valve disc cover, and valve disc, extending valve life.

[0010] In one alternative embodiment, a mounting groove is provided at one end of the valve disc near the valve stem;

[0011] A first keyway is provided on the side of the valve stem near the valve disc;

[0012] The valve cover includes:

[0013] The mounting part is installed in the mounting slot;

[0014] A plug-in hole is provided on the valve cover, and the valve stem is inserted into the plug-in hole; a second keyway is provided on the inner wall of the plug-in hole corresponding to the first keyway;

[0015] Installing keys are placed in the first keyway and the second keyway to secure the valve cover to the valve stem.

[0016] In one alternative embodiment, the mounting portion is threadedly connected to the mounting groove.

[0017] In one alternative embodiment, the valve cover further includes an abutment portion mounted on the outer surface of the valve cover;

[0018] When the mounting part is installed in the mounting groove, the abutting part abuts against the valve disc.

[0019] In one alternative embodiment, the abutment portion is welded to the valve disc.

[0020] Beneficial effects: The outer diameter of the abutment part is larger than the inner diameter of the mounting groove, forming a mechanical stop. When the mounting part is screwed into the valve disc thread, the end face of the abutment part fits tightly with the end face of the valve disc, eliminating thread clearance. The first keyway of the valve stem and the second keyway of the valve disc cover are locked by the mounting key, preventing relative rotation between the valve disc cover and the valve stem. The valve disc is connected to the valve disc cover by threads and intermittent welding, achieving secondary fixation and eliminating the possibility of loosening between the valve disc and the valve disc cover. The valve disc itself loses its rotational freedom. When high-speed or turbulent media pass through the valve, the risk of traditional valve discs rotating due to uneven impact of the media, leading to wear or sealing failure, is eliminated. Furthermore, by preventing rotation, the mechanical wear of the valve stem, valve disc cover, and valve disc is significantly reduced, extending the valve's lifespan.

[0021] In one alternative embodiment, the valve cover includes:

[0022] A valve cover body, which is mounted on the valve body;

[0023] A directional block is installed inside the valve cover body. The directional block has a accommodating cavity for installing the valve stem along the vertical direction, and the valve stem is vertically installed inside the directional block.

[0024] In one optional embodiment, a limiting hole is also provided on the directional block; a limiting groove is provided on the valve stem corresponding to the limiting hole;

[0025] The shut-off valve also includes a limit pin, which is inserted into the limit hole and the limit groove.

[0026] In one alternative implementation, the orientation block is a rectangular block.

[0027] Beneficial effects: By setting the directional block to a rectangular block, a self-locking mechanism is formed between the rectangular block and the valve cover body, preventing the rectangular block from rotating within the valve cover body. The valve stem is inserted into the receiving cavity of the directional block, constraining lateral displacement. In the horizontal direction, the limiting pin simultaneously penetrates the limiting hole of the directional block and the limiting groove of the valve stem, completely locking the rotational degree of freedom. Therefore, the valve stem can only move up and down, thereby driving the valve disc to rise and fall, thus isolating or opening the valve cavity.

[0028] In one optional embodiment, a fixing groove is provided on the outer surface of the directional block, and a fixing part is provided on the inner wall of the valve cover, the fixing part being inserted into the fixing groove.

[0029] Beneficial effect: By using the setting of the fixing part and the fixing groove, the directional block is locked to prevent the directional block from rotating in the valve cover body.

[0030] In one alternative embodiment, the shut-off valve further includes a valve stem nut and a gearbox, the valve stem nut being fixed to the top of the valve stem, the gearbox being mounted on the top of the valve disc, the gearbox being connected to the valve stem nut, and the gearbox also having a handwheel. Attached Figure Description

[0031] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a front view of a shut-off valve for preventing valve disc rotation according to an embodiment of the present invention.

[0033] Figure 2 for Figure 1 A cross-sectional view along the AA direction;

[0034] Figure 3 for Figure 1 A magnified view of a portion of point B in the middle;

[0035] Figure 4 This is a schematic diagram of the valve stem structure according to an embodiment of the present utility model;

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Valve body; 11. Valve cavity; 12. Valve seat;

[0038] 2. Valve cover; 21. Valve cover body; 22. Fixing part;

[0039] 3. Orientation block; 31. Fixing groove;

[0040] 4. Valve stem; 41. First keyway;

[0041] 5. Valve disc; 51. Mounting groove;

[0042] 6. Valve disc cover; 61. Mounting part; 62. Insertion hole; 63. Second keyway; 64. Mounting key; 65. Abutment part;

[0043] 7. Limit pin;

[0044] 8. Valve stem nut;

[0045] 9. Gearbox;

[0046] 10. Handwheel. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0048] In conventional gate valve structures, the valve disc is typically opened and closed using a rotary valve stem design. Specifically, the operator rotates a handwheel, which drives the output shaft of the gearbox. This output shaft is usually connected to or integrated with a valve stem nut. The valve stem nut has a trapezoidal thread machined internally, which meshes with the trapezoidal thread on the outside of the valve stem. The valve stem itself is restricted from circumferential rotation by a specific guiding device, allowing only linear motion along its axial direction. Therefore, when the handwheel is rotated, the rotation of the valve stem nut is converted into linear up-and-down motion of the valve stem through the trapezoidal thread pair, thereby causing the valve disc, fixed to the end of the valve stem, to rise or fall, achieving the on / off control of the medium flowing through the valve cavity.

[0049] In existing technologies, the connection between the valve disc and the valve stem is generally designed to allow relative rotation. When the medium flows through the valve orifice at high speed, the instability of the flow may generate asymmetric fluid forces on the valve disc. In conventional rotatable valve disc designs, these forces easily drive the valve disc to rotate relative to the valve stem. This continuous, uncontrolled relative rotation significantly exacerbates the frictional wear between the seals on the valve disc and the valve stem contact surface, leading to premature seal failure, decreased sealing performance, and a shortened valve lifespan.

[0050] To solve the above technical problems, the following will be combined with... Figures 1 to 4 The following describes embodiments of the present invention.

[0051] According to embodiments of the present invention, on the one hand, such as Figures 1 to 4 As shown, a stop valve for preventing valve disc rotation is provided, including a valve body 1, a valve disc 5, and a valve disc cover 6. The valve body 1 has a valve cavity 11 for the flow of a medium. A valve seat 12 is disposed in the middle of the valve cavity 11, and the valve seat 12 has a through hole for medium flow. A valve cover 2 is installed at the upper end of the valve body 1. A valve stem 4 is vertically installed inside the valve cover 2, extending through the valve cover 2 and the valve body 1 into the valve cavity 11. A valve disc cover 6 is installed at the lower end of the valve stem 4, and the valve stem 4 is fixedly connected to the valve disc cover 6. The lower end of the valve disc cover 6 is fixedly connected to the valve disc 5. The valve stem 4 drives the valve disc 5 to rise and fall through the valve disc cover 6 to conform to or move away from the valve seat 12, thereby achieving isolation or connection of the valve cavity 11.

[0052] With the above settings, when the valve stem 4 drives the valve disc 5 upward away from the valve seat 12, allowing the medium in the valve cavity 11 to flow, the valve stem 4 is indirectly connected to the valve disc 5 through the valve disc cover 6, and the two cannot rotate relative to each other. This prevents uneven flow of the medium, which could cause the valve disc 5 to rotate and increase the wear on the valve stem 4.

[0053] In some other implementations, such as Figures 1 to 4 As shown, a mounting groove 51 is provided at the upper end of the valve disc 5 near the valve stem 4. A first keyway 41 is provided at the lower end of the valve stem 4 near the valve disc 5. The valve cover 6 includes a mounting part 61, a insertion hole 62, and a mounting key 64. The mounting part 61 is located at the lower end of the entire valve cover 6 near the valve disc 5. Threads are provided on the outer surface of the mounting part 61 and the inner wall of the mounting groove 51, allowing the mounting part 61 to be rotatably installed and fixed within the mounting groove 51. The valve cover 6 is generally sleeve-shaped, with an insertion hole 62 in the middle. The inner diameter of the insertion hole 62 corresponds to the outer diameter of the lower end of the valve stem 4, and the lower end of the valve stem 4 is inserted into the insertion hole 62. A second keyway 63 is provided on the inner wall of the insertion hole 62 corresponding to the first keyway 41. The second keyway 63 extends vertically along the central axis of the insertion hole 62. The mounting key 64 is installed in the first keyway 41 and the second keyway 63 to fix the valve cover 6 to the valve stem 4. Specifically, during installation, the mounting key 64 can be installed in the first keyway 41 first, and then the valve cover 6 can be slid and installed onto the valve stem 4 by corresponding to the outer side of the mounting key 64 in the second keyway 63. Subsequently, the mounting key 64 and the valve cover 6 can be fixed by using bolts that pass through the valve cover 6 and are inserted into the mounting key 64 for fixing, thereby achieving a fixed connection between the valve cover 6 and the valve stem 4.

[0054] In some other implementations, such as Figure 3 As shown, the valve cover 6 also includes an abutment portion 65, which is formed on the outer surface of the valve cover 6. The outer diameter of the abutment portion 65 is larger than the inner diameter of the mounting groove 51. When the mounting portion 61 is installed in the mounting groove 51, the abutment portion 65 abuts against the valve disc 5, and the abutment portion 65 is welded to the valve disc 5.

[0055] The outer diameter of the abutment part 65 is larger than the inner diameter of the mounting groove 51, forming a mechanical stop. When the mounting part 61 is screwed into the valve disc 5 thread, the end face of the abutment part 65 fits tightly with the end face of the valve disc 5, eliminating thread clearance. The first keyway 41 of the valve stem 4 and the second keyway 63 of the valve disc cover 6 are locked by the mounting key 64, blocking the relative rotation between the valve disc cover 6 and the valve stem 4. Since the valve disc 5 is fixed to the valve disc cover 6 by threads and intermittent welding, a secondary fixation is achieved, eliminating the possibility of loosening between the valve disc 5 and the valve disc cover 6, and the valve disc 5 itself also loses its rotational freedom. When high-speed or turbulent media pass through the valve, the risk of the traditional valve disc 5 rotating due to uneven impact of the media, leading to wear or sealing failure, is eliminated. Furthermore, by prohibiting rotation, the mechanical wear of the valve stem 4, valve disc cover 6, and valve disc 5 is significantly reduced, extending the valve's lifespan.

[0056] In some other implementations, such as Figure 1 and Figure 2 As shown, the valve cover 2 includes a valve cover body 21 and a directional block 3. The valve cover body 21 is mounted on the valve body 1. The directional block 3 is a rectangular block and is installed inside the valve cover body 21. The directional block 3 has a accommodating cavity for mounting the valve stem 4 along the vertical direction, and the valve stem 4 is vertically mounted inside the directional block 3. A limiting hole is also horizontally provided on the directional block 3. A limiting groove is vertically provided on the valve stem 4 corresponding to the limiting hole. In the horizontal direction, the limiting hole and the limiting groove form a channel, and a limiting line is inserted into the channel formed by the limiting hole and the limiting groove.

[0057] By setting the directional block 3 as a rectangular block, a self-locking mechanism is formed between the rectangular block and the valve cover body 21, preventing the rectangular block from rotating within the valve cover body 21. The valve stem 4 is inserted into the receiving cavity of the directional block 3, constraining lateral displacement. In the horizontal direction, the limiting pin 7 simultaneously penetrates the limiting hole of the directional block 3 and the limiting groove of the valve stem 4, completely locking the rotational degree of freedom. Therefore, the valve stem 4 can only move up and down, thereby driving the valve disc 5 to rise and fall, thus isolating or opening the valve cavity 11.

[0058] In some other implementations, such as Figure 2 As shown, a fixing groove 31 is provided on the outer surface of the directional block 3, and a fixing part 22 is provided on the inner wall of the valve cover 2. The fixing part 22 is inserted into the fixing groove 31. The fixing part 22 and the fixing groove 31 are used to lock the directional block 3 and prevent the directional block 3 from rotating inside the valve cover body 21.

[0059] In some other implementations, such as Figure 1As shown, the gate valve also includes a valve stem nut 8 and a gearbox 9. The valve stem nut 8 is fixed to the top of the valve stem 4, and the gearbox 9 is installed on the top of the valve disc 5. The gearbox 9 is connected to the valve stem nut 8, and a handwheel 10 is also provided on the gearbox 9. With the above configuration, the valve is opened by rotating the handwheel 10 on the gearbox 9. The handwheel drives the gear set inside the gearbox 9, which in turn drives the valve stem nut 8 to rotate. The valve stem nut 8 drives the valve stem 4 to rotate through the trapezoidal thread, causing the valve stem 4 to move up and down, thereby causing the valve disc 5 to rise and fall, thus isolating or opening the valve chamber 11.

[0060] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A shut-off valve for preventing valve disc rotation, characterized in that, include: A valve body (1) is provided, wherein a valve cavity (11) for the flow of medium is provided inside the valve body (1), a valve seat (12) is installed inside the valve cavity (11), and a valve cover (2) is installed on the valve body (1); a valve stem (4) is installed inside the valve cover (2); The valve disc (5) is installed in the valve cavity (11) and the valve stem (4) is connected to the valve stem (4). The valve disc (5) is driven by the valve stem (4) to fit against or move away from the valve seat (12) to isolate or connect the valve cavity (11). It also includes a valve cover (6), one end of which is fixedly connected to the valve disc (5), and the other end is fixedly connected to the valve stem (4).

2. The shut-off valve for preventing valve disc rotation according to claim 1, characterized in that, The valve disc (5) has an installation groove (51) at one end near the valve stem (4); The valve stem (4) has a first keyway (41) on one side near the valve disc (5); The valve cover (6) includes: Mounting part (61), which is installed in the mounting slot (51); A plug hole (62) is provided on the valve cover (6), and the valve stem (4) is inserted into the plug hole (62); a second keyway (63) is provided on the inner wall of the plug hole (62) corresponding to the first keyway (41); Mounting keys (64) are placed in the first keyway (41) and the second keyway (63) to fix the valve cover (6) onto the valve stem (4).

3. The shut-off valve for preventing valve disc rotation according to claim 2, characterized in that, The mounting part (61) is threadedly connected to the mounting groove (51).

4. The shut-off valve for preventing valve disc rotation according to claim 2, characterized in that, The valve cover (6) further includes an abutment portion (65), which is installed on the outer surface of the valve cover (6); When the mounting part (61) is installed in the mounting groove (51), the abutting part (65) abuts against the valve disc (5).

5. The shut-off valve for preventing valve disc rotation according to claim 4, characterized in that, The abutment part (65) is welded to the valve disc (5).

6. The shut-off valve for preventing valve disc rotation according to claim 4, characterized in that, The valve cover (2) includes: Valve cover body (21), the valve cover body (21) is mounted on the valve body (1); The directional block (3) is installed inside the valve cover body (21). The directional block (3) has a accommodating cavity for installing the valve stem (4) in the vertical direction. The valve stem (4) is installed vertically inside the directional block (3).

7. The shut-off valve for preventing valve disc rotation according to claim 6, characterized in that, The directional block (3) is also provided with a limiting hole; the valve stem (4) is provided with a limiting groove corresponding to the limiting hole; The shut-off valve also includes a limiting pin (7), which is inserted into the limiting hole and the limiting groove.

8. The shut-off valve for preventing valve disc rotation according to claim 6, characterized in that, Oriented block (3) is a rectangular block.

9. The shut-off valve for preventing valve disc rotation according to claim 6, characterized in that, The outer surface of the directional block (3) is provided with a fixing groove (31), and the inner wall of the valve cover (2) is provided with a fixing part (22), which is inserted into the fixing groove (31).

10. The shut-off valve for preventing valve disc rotation according to claim 6, characterized in that, The shut-off valve also includes a valve stem nut (8) and a gearbox (9). The valve stem nut (8) is fixed to the top of the valve stem (4). The gearbox (9) is installed on the top of the valve disc (5). The gearbox (9) is connected to the valve stem nut (8). A handwheel (10) is also provided on the gearbox (9).

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