Ball valve with limiting structure

Abstract

The utility model relates to the field of ball valves, and particularly discloses a ball valve with a limiting structure, the ball valve comprises a valve body, a valve rod, a ball body, valve seats and a packing gland, the two valve seats are installed in the valve body, the ball body is rotatably and hermetically arranged between the two valve seats, the valve rod penetrates through the valve body, and a packing gap is formed between the valve body and the valve rod; the packing gap is filled with sealing packing, the valve rod penetrates through the packing gland, the packing gland is installed on the valve body through two bolts and located at the packing gap, the valve rod is sleeved with a main body plate, the main body plate and the valve rod rotate synchronously, the two ends of the main body plate are respectively provided with two extending sections, the extending sections extend in the direction close to the valve body, and a limiting groove is formed in the valve body. The end, away from the main body plate, of the extending section extends into the limiting groove, and when the flow channel in the valve body is completely opened or completely closed, the extending section is exactly connected to the side wall of the limiting groove in an abutting mode. The device has the advantages of being simple in structure and convenient to implement.

Description

Technical Field

[0001] The present application relates to the field of ball valves, and in particular to a ball valve with a limiting structure. Background Art

[0002] The ball valve is a widely used valve type that controls the flow of media by rotating a ball with a circular channel to achieve the purpose of opening and closing.

[0003] A traditional ball valve consists of a valve body, a valve stem and a packing gland. The valve stem is used to drive the ball in the valve body to rotate. The flow channel can be opened and closed by rotating the valve stem 90°. The gap between the valve stem and the valve body is filled with packing. The packing gland is used to compact the packing to achieve a seal between the valve stem and the valve body.

[0004] The packing gland is usually fitted with two bolts at both ends, which are screwed into the valve body. A limit plate is installed above the packing gland, and the limit plate rotates between the two bolts. When the valve stem is rotated so that the limit plate contacts the two bolts, the flow channel is fully opened or closed. Rotating the valve stem 90° in the opposite direction and contacting the limit plate with the two bolts switches the flow channel's opening and closing state. The limit plate and bolts work together to prevent the flow channel from being unable to fully open or close due to the ball rotating slightly more or less, thereby improving the control accuracy of the ball valve.

[0005] However, according to the ball valve design standard GB / T 12237-2021, the packing gland bolts should not be subject to the shear force generated by the torque of ball valve operation. Therefore, the packing gland bolts can no longer be relied upon to limit the position of the valve stem. Therefore, a position-limiting structure that does not interfere with the packing gland bolts is urgently needed. Utility Model Content

[0006] In order to limit the position of the valve stem without interfering with the packing gland bolts, the present application provides a ball valve with a limiting structure, which has the advantages of simple structure and convenient implementation.

[0007] The ball valve with a limiting structure provided in this application adopts the following technical solution:

[0008] 10. The unclamping method of claim 19, wherein the unclamping means is a method of releasing the valve body to allow the valve to penetrate into the closure of the valve body and into the closure of the valve body, wherein the closure is located adjacent the valve seat and the valve stem.

[0009] By adopting the above technical solution, when the valve stem is rotated to adjust the position of the ball, the extension section cooperates with the limit surface to limit the rotation angle of the valve stem, and when the extension section abuts against the limit surface, there is still a gap between the main plate and the bolts of the packing gland, that is, the main plate will not exert shear force on the bolts of the packing gland during the operation of the ball valve, while meeting the design standard requirements, maintaining the limitation of the valve stem rotation angle, and improving the control accuracy of the valve body flow channel.

[0010] Optionally, two extension sections are provided, and the two extension sections are respectively fixed at both ends of the main plate. At least four limiting surfaces are formed on the valve body corresponding to the two extension sections. When the valve body flow channel is fully opened or fully closed, the two extension sections respectively abut against two of the limiting surfaces, and there is a gap between the bolts of the main plate and the packing cover.

[0011] By adopting the above technical solution, the two extension sections synchronously abut against the corresponding limit surfaces when the valve is fully opened or closed, so that the forces at both ends of the main plate remain balanced, further improving the stability of the limit structure.

[0012] Optionally, two limiting grooves are provided on the valve body, and the side walls of the two limiting grooves form limiting surfaces for abutting the extension section.

[0013] By adopting the above technical solution, the side wall of the limiting groove is used to form a limiting surface to limit the position of the extension section, which has a simple structure and is easy to implement.

[0014] Optionally, the extension section extends in a direction perpendicular to the surface of the main body plate.

[0015] By adopting the above technical solution, the abutment and cooperation between the extension section and the side wall of the limiting groove is more facilitated, and the overall structural layout is optimized.

[0016] Optionally, the extension section is formed with two abutment surfaces, and when the valve body flow channel is fully opened or fully closed, one of the abutment surfaces fits against the side wall of the limiting groove.

[0017] By adopting the above technical solution, a larger working surface can be formed between the abutting surface and the side wall of the limiting groove, so that the extension section can abut against the side wall of the limiting groove more stably.

[0018] Optionally, the main body plate and the extension section are an integrally formed structure.

[0019] By adopting the above technical solution, the processing efficiency and cost of the one-piece molding structure are lower, and the connection strength is better.

[0020] Optionally, the cross-section of one end of the valve stem away from the valve body is square, the main plate is provided with a square hole of corresponding size, and the end of the square cross-section of the valve stem is inserted into the square hole of the main plate.

[0021] By adopting the above technical solution, the valve stem and the main plate form a circumferential limit with each other, so that the two rotate synchronously, and the structure is simple and stable.

[0022] Optionally, a packing pressing ring is further included, which is sleeved on the valve stem and extends into the packing gap. One end of the packing pressing ring abuts against the sealing packing, and the other end abuts against the packing gland.

[0023] By adopting the above technical solution, the sealing filler can be pressed more tightly into the filler gap using the filler pressing ring, thereby further improving the sealing effect.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. The extension section cooperates with the limit surface to limit the rotation angle of the valve stem. When the extension section abuts the limit surface, there is still a gap between the main plate and the bolts of the packing gland. In other words, the main plate will not exert shear force on the bolts of the packing gland during the operation of the ball valve. While meeting the design standard requirements, the rotation angle of the valve stem is kept limited, thereby improving the control accuracy of the valve body flow channel.

[0026] 2. A larger working surface is formed between the abutment surface and the limiting surface, so that the extension section can abut against the limiting surface more stably;

[0027] 3. The packing pressing ring can be used to press the sealing packing more tightly into the packing gap, which can form a good sealing effect; the combination of the sealing ring and the ball can further improve the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a top view of the overall structure of the embodiment of the present application;

[0029] Figure 2 It is a side view of the overall structure of the embodiment of the present application;

[0030] Figure 3 is a cross-sectional view of the overall structure of an embodiment of the present application;

[0031] Figure 4 This is a schematic diagram showing the main trigger extension section alone according to an embodiment of the present application.

[0032] Figure numerals: 1. valve body; 2. valve stem; 3. packing gland; 4. sphere; 5. packing gap; 6. sealing packing; 7. main plate; 8. extension section; 9. limiting groove; 10. abutting surface; 11. packing pressing ring; 12. valve seat; 13. limiting surface. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-4 This application is described in further detail.

[0034] Example 1 of the present application discloses a ball valve with a limit structure, referring to Figure 1 、 Figure 2 and Figure 3 , including a valve body 1, a valve stem 2, a ball 4, a valve seat 12, and a packing gland 3. Two valve seats 12 are provided and installed in the valve body 1. The ball 4 is rotatably and sealingly arranged between the two valve seats 12. The valve stem 2 is inserted into the valve body 1. A packing gap 5 is formed between the valve body 1 and the valve stem 2. The packing gap 5 is filled with sealing packing 6. The valve stem 2 passes through the packing gland 3. The packing gland 3 is installed on the valve body 1 by two bolts and is located in the packing gap 5. The packing gland 3 presses the sealing packing 6 between the valve stem 2 and the valve body 1 to form a seal between the valve stem 2 and the valve body 1, preventing fluid from leaking from the gap between the valve stem 2 and the valve body 1.

[0035] At the same time, a main plate 7 is sleeved on the valve stem 2, and the main plate 7 rotates synchronously with the valve stem 2. At least one extension section 8 is fixedly connected to the main plate 7, and the extension section 8 extends in a direction close to the valve body 1. At least two limiting surfaces 13 are formed on the valve body 1 corresponding to the extension section 8. Usually, one extension section 8 corresponds to two limiting surfaces 13.

[0036] When the valve stem 2 is rotated to open or close the valve, the main plate 7 rotates synchronously, and the extension section 8 gradually approaches one of the limit surfaces 13 along an arc. When the valve is fully opened or fully closed (the rotation angle of the ball 4 differs by 90° in these two states), the extension section 8 just abuts against one of the limit surfaces 13, limiting the rotation angle of the valve stem 2. At this time, there is still a gap between the main plate 7 and the bolts of the packing gland 3.

[0037] That is to say, when the valve stem 2 is rotated to adjust the opening and closing of the valve body 1, the extension section 8 cooperates with the limit surface 13, which can effectively avoid contact between the main plate 7 and the bolts of the packing gland 3, and thus no shear force will be applied to the bolts. It can meet the requirements of the ball valve design standards, and at the same time realize the limitation of the rotation angle of the valve stem 2, thereby improving the control accuracy of the flow channel of the valve body 1.

[0038] In this embodiment, two extensions 8 are provided at each end of the main plate 7, while a limiting groove 9 is defined in the valve body 1. The end of the extension 8, distal from the main plate 7, extends into the limiting groove 9. The sidewalls of the limiting groove 9 form limiting surfaces 13 for abutting the extensions 8. Four limiting surfaces 13 are formed, corresponding to the two extensions 8. The extensions 8 cooperate with the limiting surfaces 13 to limit the rotation angle of the valve stem 2, thereby controlling the rotation angle of the ball 4. When the flow passage within the valve body 1 is fully open or fully closed, the extensions 8 precisely abut the sidewalls of the limiting groove 9 (i.e., the limiting surfaces 13), and a gap exists between the main plate 7 and the bolts of the packing gland 3.

[0039] The two extension sections 8 are symmetrically distributed around the axis of the valve stem 2 and synchronously abut against the corresponding limit surfaces 13 when the valve is fully opened or closed, so that the forces at both ends of the main plate 7 remain balanced, further improving the stability of the limit structure.

[0040] Specifically, refer to Figure 1 and Figure 4 The extension section 8 extends perpendicular to the surface of the main plate 7, forming an approximately L-shaped structure between the extension section 8 and the main plate 7. The extension section 8 and the main plate 7 are integrally formed. This one-piece molding process is less difficult and more efficient, while also ensuring the strength of the connection between the main plate 7 and the extension section 8, thereby improving durability.

[0041] Further, refer to Figure 4 Two abutment surfaces 10 are formed on both sides of the extension section 8. When the flow passage in the valve body 1 is fully open or fully closed, one of the abutment surfaces 10 of the extension section 8 abuts and fits against one of the limit surfaces 13. When the valve stem 2 rotates to the other state, the other abutment surface 10 of the extension section 8 abuts and fits against the other limit surface 13. That is, in the two states, the abutment surfaces 10 cooperate with different positions of the side wall of the limit groove 9. The provision of the abutment surfaces 10 increases the working surface between the extension section 8 and the side wall of the limit groove 9, optimizing the cooperation between the two.

[0042] Furthermore, the cross-section of the end of the valve stem 2 away from the sphere 4 is square, and a square hole is opened through the main plate 7. The shapes and sizes of the two match, and the cross-sectional size of the square hole is slightly larger than the square cross-section of the valve stem 2. During installation, the square end of the valve stem 2 is inserted into the square hole, and the valve stem 2 and the main plate 7 form circumferential limits on each other so that the two rotate synchronously.

[0043] Reference Figure 3 The valve stem 2 is provided with a packing follower ring 11, which is an annular structure. One end of the packing follower ring 11 is adapted to the shape of the packing gap 5 and extends into the packing gap 5, and the other end abuts against the packing gland 3. The packing follower ring 11 can be used to more stably and firmly press the sealing packing 6 into the packing gap, effectively improving the sealing effect.

[0044] The implementation principle of Example 1 of the present application is: when the valve stem 2 is rotated to adjust the position of the ball 4 so that the flow channel of the valve body 1 switches between the fully open and fully closed states, the abutting surface 10 of the extension section 8 cooperates with the side wall of the limiting groove 9 to limit the rotation angle of the valve stem 2, and when the extension section 8 abuts against the side wall of the limiting groove 9, there is still a gap between the main plate 7 and the bolts of the packing cover 3, that is, the main plate 7 will not apply shear force to the bolts of the packing cover 3 during the operation of the ball valve, thereby meeting the design standard requirements while maintaining the limitation of the rotation angle of the valve stem 2.

[0045] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A ball valve with a position limiting structure, comprising a valve body (1), a valve stem (2), a ball (4), a valve seat (12) and a packing gland (3), wherein two valve seats (12) are provided and mounted on the valve body (1), the ball (4) is arranged between the two valve seats (12), a packing gap is formed between the valve body (1) and the valve stem (2), the packing gap is filled with a sealing packing (6), the packing gland (3) is mounted on the valve body (1) by two bolts, and the sealing packing (6) is clamped between the packing gland (3), the valve body (1) and the valve stem (2), and is characterized in that: The valve body (1) further comprises a main plate (7) and at least one extension section (8), wherein the extension section (8) is fixed to the main plate (7), the main plate (7) is mounted on the valve stem (2), and rotates with the valve stem (2), at least two limiting surfaces (13) are formed on the valve body (1) corresponding to the extension section (8), and when the valve stem (2) rotates, the extension section (8) moves toward one of the limiting surfaces (13), and when the flow channel of the valve body (1) is fully opened or fully closed, the extension section (8) abuts against one of the limiting surfaces (13), and there is a gap between the main plate (7) and the bolts of the packing gland (3).

2. A ball valve with a limiting structure according to claim 1, characterized in that: Two extension sections (8) are provided, and the two extension sections (8) are respectively fixed to the two ends of the main plate (7). At least four limiting surfaces are formed on the valve body (1) corresponding to the two extension sections (8). When the flow channel of the valve body (1) is fully opened or fully closed, the two extension sections (8) respectively abut against two of the limiting surfaces, and there is a gap between the main plate (7) and the bolts of the packing gland (3).

3. The ball valve with a limiting structure according to claim 1, characterized in that: Two limiting grooves (9) are provided on the valve body (1), and the side walls of the two limiting grooves (9) form limiting surfaces (13) for abutting against the extension section (8).

4. The ball valve with a limiting structure according to claim 1, characterized in that: The extension section (8) extends in a direction perpendicular to the surface of the main plate (7).

5. The ball valve with a limiting structure according to claim 1, characterized in that: The extension section (8) is formed with two abutment surfaces (10), and when the flow channel of the valve body (1) is fully opened or fully closed, one of the abutment surfaces (10) fits against one of the limit surfaces (13).

6. The ball valve with a limiting structure according to claim 1, characterized in that: The main body plate (7) and the extension section (8) are an integrally formed structure.

7. The ball valve with a limiting structure according to claim 1, characterized in that: The cross section of one end of the valve stem (2) away from the valve body (1) is square, the main plate (7) is provided with a square hole of corresponding size, and the end of the square cross section of the valve stem (2) is inserted into the square hole of the main plate (7).

8. The ball valve with a limiting structure according to claim 1, characterized in that: It also includes a packing pressing ring (11), which is sleeved on the valve stem (2) and extends into the packing gap. One end of the packing pressing ring (11) abuts against the sealing packing (6), and the other end abuts against the packing gland (3).

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