A stop valve and a method of assembling a stop valve

Abstract

The application relates to the technical field of valves, in particular to a stop valve and an assembling method thereof. The valve pipe comprises an inlet and an outlet, the inner walls of the inlet and the outlet are all turned to have internal threads, a sealing sleeve is slidably arranged at the central position of the valve pipe, a valve port seat is arranged in the sealing sleeve, a valve port is arranged at the central position of the valve port seat, a conical valve disc is slidably arranged in the valve port, the slope angle of the outer circumferential surface of the conical valve disc is the same as the slope angle of the inner surface of the valve port, a sealing cover is arranged at the top of the valve pipe, a threaded column is vertically and slidably arranged at the central position of the top of the sealing cover, a connecting assembly for controlling the lifting of the conical valve disc is arranged at the bottom of the threaded column, a handle is coaxially arranged at the top of the threaded column, and flanges are welded at the two ends of the valve pipe. The valve disc moves from the water inlet end to the water outlet end, the valve disc is closed under the thrust of the water flow, the closing is simple, the resistance is small, and the closing speed and difficulty are greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a gate valve and a method for assembling the gate valve. Background Technology

[0002] Gate valves, also known as stop valves, are the most widely used type of valve. They are popular because of the low friction between the sealing surfaces during opening and closing, their durability, small opening height, ease of manufacturing, and convenient maintenance. The valve plays an important role in cutting off and throttling the medium in the pipeline it is connected to. Gate valves are an extremely important type of shut-off valve.

[0003] Gate valves have a relatively simple structure, with a short valve disc stroke, short opening and closing time, and a small valve height. However, they have high fluid resistance, a relatively tortuous medium passage within the valve body, and high energy consumption. They also require significant opening and closing torque and are relatively labor-intensive to operate. When closed, because the direction of valve disc movement is opposite to the direction of medium pressure, the valve disc's movement must overcome the force of the medium, hence the large opening and closing torque.

[0004] A search revealed that CN114576390 A discloses a shut-off valve that can control any two of the three passages by controlling the cylindrical valve body and the arc-shaped valve body.

[0005] However, through exploration, the inventors have discovered that this technical solution still has at least the following defects: First, the technology uses a stud to control the lifting and lowering of the stepped valve body. During the rotation of the stud, the stepped valve body needs to rotate synchronously. When the valve port is closed, the stepped valve body needs to rotate and rub against the top of the inner shoulder. Therefore, as the number of opening and closing times increases, the stepped valve body will wear out, which will lead to a decrease in sealing performance. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a shut-off valve and a method for assembling the shut-off valve, so as to solve the problem of reduced sealing performance caused by friction between the valve disc and the valve port when the valve port is closed.

[0007] To achieve the above objectives, the present invention provides a shut-off valve and a method for assembling the shut-off valve.

[0008] A shut-off valve includes a valve tube with an inlet and an outlet. The inner walls of both the inlet and outlet are machined with internal threads. A sealing sleeve is slidably inserted at the center of the valve tube. A valve seat is inserted inside the sealing sleeve, and a valve port is formed at the center of the valve seat. A conical valve disc is slidably inserted inside the valve port. The bevel angle of the outer circumference of the conical valve disc is the same as the bevel angle inside the valve port. A sealing cap is provided at the top of the valve tube. A threaded post is vertically slidably inserted at the center of the top of the sealing cap. A connecting assembly for controlling the raising and lowering of the conical valve disc is provided at the bottom of the threaded post. A handle is coaxially provided at the top of the threaded post. Flanges are welded to both ends of the valve tube.

[0009] Furthermore, the connecting assembly includes a sliding column laterally disposed at the lower part of the threaded column, with hooks slidably fitted at both ends of the sliding column. The hooks have an L-shaped cross-section. The connecting assembly also includes a connecting ring disposed at the top of the conical valve disc. The connecting ring is connected to the conical valve disc by bolts. Limiting plates are coaxially disposed at both ends of the sliding column. A circular notch is opened at the center position of the top of the conical valve disc, and the bottom of the hooks is located inside the circular notch.

[0010] Furthermore, guide rods are vertically and symmetrically welded to the top of the connecting ring. The top of the guide rods simultaneously passes through the sealing sleeve, the sealing cover, and the top of the gantry frame. Guide rod sealing rings are fitted on the outer circumference of the guide rods, and the guide rod sealing rings are all fixed to the top of the sealing cover.

[0011] Furthermore, a first bevel is provided on the inner surface of the top of the connecting ring, and a second bevel is provided on the bottom of the hook near the limiting plate. The opening angle of the second bevel is the same as that of the first bevel.

[0012] Furthermore, multiple balls are embedded at the bottom of the connecting ring, and the bottom of each ball slides against the lower plane of the hook.

[0013] Furthermore, compression springs are respectively fitted on the sliding column near the position between the hook and the outer circumference of the threaded column.

[0014] Furthermore, a nut is threaded onto the outer circumferential surface of the threaded post, and the nut is fixed to the top of the post sealing ring.

[0015] Furthermore, pressure rings are inserted inside both the inlet and outlet ends, and a through-hole is opened at the center of each pressure ring. External threads are machined on the outer circumference of each pressure ring, and the external threads mesh with the internal threads. Each pressure ring abuts against both ends of the sealing sleeve.

[0016] Furthermore, each pressure ring is symmetrically provided with connecting rods in the transverse direction away from the sealing sleeve, and each connecting rod is provided with the same handle at the end away from the pressure ring.

[0017] The preparation of the shut-off valve includes the following steps:

[0018] Step 1: First, machine internal threads on both ends of the valve tube and external threads on the outer circumference of the pressure ring. Weld flanges onto both ends of the valve tube.

[0019] Step 2: Insert the valve seat into the sealing sleeve, then insert the sealing sleeve into the center of the valve tube, and then rotate the external thread of the pressure ring to connect with the internal threads of the inlet and outlet inner walls respectively. Drive the pressure ring to rotate through the handle and connecting rod until the two ends of the sealing sleeve are pressed tightly.

[0020] Step 3: Insert the connecting ring with the guide rod welded to it into the valve tube, and connect the connecting ring to the conical valve disc with bolts. Then insert the bottom end of the threaded column into the valve tube. When the threaded column descends, it drives the sliding column and the hook to descend synchronously. When the second bevel of the hook abuts against the first bevel of the connecting ring, the hook slides along the sliding column under pressure. When the hook descends into the circular notch, it slides towards the limiting plate under the action of the compression spring and abuts against the bottom of the ball.

[0021] Step 4: Pass the sealing cap through the threaded post and guide rod and fix it to the top of the valve tube. Then pass the gantry through the threaded post and guide rod and connect it to the top of the sealing cap. Fix the throttle to the top of the threaded post.

[0022] The beneficial effects of this invention are:

[0023] 1. This invention utilizes a conical valve disc in conjunction with a valve seat, employing a different working mode than conventional stop valves. It moves the valve disc from the inlet end to the outlet end, thus making valve disc closure simpler and less resistant under the thrust of water flow, thereby greatly reducing the closing speed and difficulty.

[0024] 2. In this invention, the connecting component does not cause the valve disc to rotate when controlling the conical valve disc to rise. Therefore, when closing the valve port, there is no rotational friction with the valve port, which greatly improves the service life of the valve disc. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a frontal cross-sectional view of an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram showing the positional relationship between the pressure ring and the sealing sleeve in an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram illustrating the connection method between the connecting ring and the conical valve disc in an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram showing the connection position between the conical valve disc and the valve seat in an embodiment of the present invention.

[0030] Figure 5 Embodiments of the present invention Figure 1 A magnified schematic diagram of the local structure at point A;

[0031] Figure 6 Embodiments of the present invention Figure 1 A magnified schematic diagram of the local structure at point B;

[0032] Figure 7 This is a schematic diagram illustrating the connection relationship between the threaded post and the hook in an embodiment of the present invention;

[0033] Figure 8 This is a schematic diagram showing the connection relationship between the sealing cover and the gantry frame in an embodiment of the present invention.

[0034] The diagram is marked as follows:

[0035] 1. Valve pipe; 101. Inlet; 102. Outlet; 2. Sealing cap; 3. Threaded stud; 4. Stud sealing ring; 5. Valve seat; 6. Conical valve disc; 61. Circular notch; 7. Connecting ring; 71. Bolt; 72. First bevel; 8. Guide rod; 9. Guide rod sealing ring; 10. Turn handle; 11. Sliding column; 12. Hook; 121. Second bevel; 13. Limiting plate; 14. Compression spring; 15. Ball bearing; 16. Gantry frame; 17. Sealing sleeve; 18. Pressure ring; 19. Connecting rod; 20. Handle; 21. Internal thread; 22. External thread. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0037] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0038] like Figures 1 to 8 As shown, a shut-off valve includes a valve pipe 1, which has an inlet 101 and an outlet 102. The inner walls of both the inlet 101 and the outlet 102 are machined with internal threads 21. A sealing sleeve 17 is slidably inserted at the center of the valve pipe 1. A valve seat 5 is inserted inside the sealing sleeve 17. A valve port is opened at the center of the valve seat 5. A conical valve disc 6 is slidably inserted inside the valve port. The bevel angle of the outer circumference of the conical valve disc 6 is the same as the bevel angle inside the valve port. A sealing cover 2 is provided at the top of the valve pipe 1. A threaded post 3 is vertically slidably inserted at the center of the top of the sealing cover 2. A connecting component for controlling the raising and lowering of the conical valve disc 6 is provided at the bottom of the threaded post 3. A handle 10 is coaxially provided at the top of the threaded post 3. Flanges are welded to both ends of the valve pipe 1.

[0039] Specifically, the connecting assembly includes a sliding column 11 horizontally disposed at the lower part of the threaded column 3, with hooks 12 slidably sleeved at both ends of the sliding column 11. The hooks 12 have an L-shaped cross section. The connecting assembly also includes a connecting ring 7 disposed at the top of the conical valve disc 6. The connecting ring 7 is connected to the conical valve disc 6 by bolts 71. Limiting plates 13 are coaxially disposed at both ends of the sliding column 11. A circular notch 61 is opened at the center of the top of the conical valve disc 6. The bottom of the hooks 12 is located inside the circular notch 61.

[0040] Specifically, guide rods 8 are vertically and symmetrically welded to the top of the connecting ring 7. The top of the guide rods 8 passes through the top of the sealing sleeve 17, the sealing cover 2, and the gantry frame 16. Guide rod sealing rings 9 are fitted on the outer circumference of the guide rods 8, and the guide rod sealing rings 9 are fixed to the top of the sealing cover 2.

[0041] Specifically, the inner surface of the top of the connecting ring 7 has a first bevel 72, and the bottom of the hook 12 near the end of the limiting plate 13 has a second bevel 121. The opening angle of the second bevel 121 is the same as that of the first bevel 72.

[0042] Specifically, the bottom of the connecting ring 7 is embedded with multiple balls 15, and the bottom of each ball 15 slides against the lower plane of the hook 12.

[0043] Specifically, compression springs 14 are respectively fitted on the sliding column 11 at the position between the hook 12 and the outer peripheral surface of the threaded column 3.

[0044] Specifically, a nut is threaded onto the outer circumferential surface of the threaded post 3, and the nut is fixed to the top of the threaded post sealing ring 4.

[0045] Specifically, pressure rings 18 are inserted inside both ends of the inlet 101 and the outlet 102. A through hole is opened at the center of each pressure ring 18. External threads 22 are machined on the outer circumference of each pressure ring 18. The external threads 22 and internal threads 21 mesh with each other. Each pressure ring 18 abuts against both ends of the sealing sleeve 17.

[0046] Specifically, each pressure ring 18 is symmetrically provided with connecting rods 19 in the transverse direction away from the sealing sleeve 17, and each connecting rod 19 is provided with the same handle 20 at the end away from the pressure ring 18.

[0047] The method for preparing a shut-off valve includes the following steps:

[0048] Step 1: First, machine the internal threads 21 at both ends of valve pipe 1, machine the external threads 22 on the outer circumference of pressure ring 18, and weld flanges to both ends of valve pipe 1.

[0049] Step 2: Insert the valve seat 5 into the inside of the sealing sleeve 17, then insert the sealing sleeve 17 into the center of the valve tube 1, and then rotate the external thread 22 of the pressure ring 18 to connect with the internal thread 21 of the inner wall of the inlet 101 and the outlet 102 respectively. Drive the pressure ring 18 to rotate through the handle 20 and the connecting rod 19 until the two ends of the sealing sleeve 17 are pressed tightly.

[0050] Step 3: Insert the connecting ring 7 with the guide rod 8 welded to it into the valve tube 1, and connect the connecting ring 7 to the conical valve disc 6 with the bolt 71. Then insert the bottom end of the threaded column 3 into the valve tube 1. When the threaded column 3 descends, it drives the sliding column 11 and the hook 12 to descend synchronously. When the second bevel 121 of the hook 12 abuts against the first bevel 72 of the connecting ring 7, the hook 12 slides along the sliding column 11 under pressure. When the hook 12 descends into the circular notch 61, the hook 12 slides towards the limiting plate 13 under the action of the compression spring 14 and abuts against the bottom of the ball 15.

[0051] Step 4: Pass the sealing cap 2 through the threaded post 3 and the guide rod 8 and fix it to the top of the valve tube 1. Then pass the gantry frame 16 through the threaded post 3 and the guide rod 8 and connect it to the top of the sealing cap 2. Fix the throttle 10 to the top of the threaded post 3.

[0052] Working principle: When in use, the liquid enters from the inlet 101 of the valve pipe 1, passes through the center of the pressure ring, passes through the opening of the valve seat 5, and finally exits through the outlet 102. When the valve needs to be closed, turn the handle 10. When the handle 10 turns, it drives the threaded column 3 to turn. When the threaded column 3 turns, it slowly rises under the action of the nut. When the threaded column 3 turns, it drives the sliding column 11 to rotate synchronously. At this time, the sliding column 11 drives the hook 12 to rotate. When the hook 12 rotates, it also rises synchronously with the threaded column 3. Therefore, when the hook 12 rises, it will apply a thrust to the bottom of the connecting ring 7 through the ball 15. At this time, the connecting ring 7 drives the conical valve disc 6 to rise vertically under the action of the bolt 71 until the opening of the valve seat 5 is completely closed.

[0053] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A shut-off valve, comprising a valve tube (1), characterized in that, The valve tube (1) includes an inlet (101) and an outlet (102). The inner walls of the inlet (101) and the outlet (102) are machined with internal threads (21). A sealing sleeve (17) is slidably inserted at the center of the valve tube (1). A valve seat (5) is inserted inside the sealing sleeve (17). A valve port is opened at the center of the valve seat (5). A conical valve disc (6) is slidably inserted inside the valve port. The bevel angle of the outer circumference of the conical valve disc (6) is the same as the bevel angle inside the valve port. A sealing cover (2) is provided at the top of the valve tube (1). A threaded column (3) is vertically slidably inserted at the center of the top of the sealing cover (2). A connecting component for controlling the lifting and lowering of the conical valve disc (6) is provided at the bottom of the threaded column (3). A handle (10) is coaxially provided at the top of the threaded column (3). Flanges are welded to both ends of the valve tube (1). The connecting assembly includes a sliding column (11) horizontally disposed at the lower part of the threaded column (3). Both ends of the sliding column (11) are slidably fitted with hooks (12). The hooks (12) have an L-shaped cross section. The connecting assembly also includes a connecting ring (7) disposed at the top of the conical valve disc (6). The connecting ring (7) is connected to the conical valve disc (6) by bolts (71). Both ends of the sliding column (11) are coaxially provided with limiting plates (13). A circular notch (61) is opened at the center of the top of the conical valve disc (6). The bottom of the hooks (12) is located inside the circular notch (61).

2. A shut-off valve according to claim 1, characterized in that, The top of the connecting ring (7) is vertically symmetrically welded with guide rods (8). The top of the guide rods (8) simultaneously passes through the top of the sealing sleeve (17), the sealing cover (2), and the gantry frame (16). The outer circumference of the guide rods (8) is fitted with guide rod sealing rings (9), and the guide rod sealing rings (9) are all fixed to the top of the sealing cover (2).

3. A shut-off valve according to claim 2, characterized in that, The connecting ring (7) has a first bevel (72) on its top inner ring surface, and the hook (12) has a second bevel (121) at the bottom end near the limiting plate (13). The opening angle of the second bevel (121) is the same as that of the first bevel (72).

4. A shut-off valve according to claim 3, characterized in that, The bottom of the connecting ring (7) is embedded with multiple balls (15), and the bottom of each ball (15) slides against the lower plane of the hook (12).

5. A shut-off valve according to claim 4, characterized in that, Compression springs (14) are respectively fitted on the sliding column (11) near the position between the hook (12) and the outer circumference of the threaded column (3).

6. A shut-off valve according to claim 5, characterized in that, The threaded post (3) is threaded with a nut on its outer circumferential surface, and the nut is fixed to the top of the post sealing ring (4).

7. A shut-off valve according to claim 6, characterized in that, Both ends of the inlet (101) and outlet (102) are fitted with pressure rings (18), and each pressure ring (18) has a through hole at its center. The outer circumferential surface of each pressure ring (18) is machined with external threads (22), which mesh with the internal threads (21). The two pressure rings (18) abut against both ends of the sealing sleeve (17).

8. A shut-off valve according to claim 7, characterized in that, The pressure ring (18) is provided with a connecting rod (19) symmetrically on one side away from the sealing sleeve (17), and the connecting rod (19) is provided with the same handle (20) on one side away from the pressure ring (18).

9. A method for assembling a shut-off valve, wherein the assembly method is implemented using a shut-off valve as described in claim 8, characterized in that, Includes the following steps: Step 1: First, machine the internal threads (21) at both ends of the valve tube (1), machine the external threads (22) on the outer circumference of the pressure ring (18), and weld the flanges to both ends of the valve tube (1); Step 2: Insert the valve seat (5) into the sealing sleeve (17), then insert the sealing sleeve (17) into the center of the valve tube (1), and then rotate the external thread (22) of the pressure ring (18) to the internal thread (21) of the inlet (101) and outlet (102) respectively. Drive the pressure ring (18) to rotate through the handle (20) and connecting rod (19) until the two ends of the sealing sleeve (17) are pressed tightly. Step 3: Insert the connecting ring (7) with the guide rod (8) into the valve tube (1), and connect the connecting ring (7) to the conical valve disc (6) with the bolt (71). Then insert the bottom end of the threaded column (3) into the valve tube (1). When the threaded column (3) descends, it drives the sliding column (11) and the hook (12) to descend synchronously. When the second bevel (121) of the hook (12) abuts against the first bevel (72) of the connecting ring (7), the hook (12) slides along the sliding column (11) under pressure. When the hook (12) descends into the round notch (61), the hook (12) slides towards the limiting plate (13) under the action of the compression spring (14) and abuts against the bottom of the ball (15). Step 4: Pass the sealing cap (2) through the threaded post (3) and the guide rod (8) and fix it to the top of the valve tube (1). Then pass the gantry (16) through the threaded post (3) and the guide rod (8) and connect it to the top of the sealing cap (2). Fix the throttle (10) to the top of the threaded post (3).

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