Ball valve

Abstract

The utility model relates to the technical field of valves, in particular to a ball valve which comprises a valve body, a valve cover, a valve rod, a ball core and an executing mechanism, and the ball core is in sealing fit with a first valve seat assembly and a second valve seat assembly on the two sides at the same time to divide a channel into an inlet channel and an outlet channel. The inner wall of the valve body is provided with a mounting groove allowing the first valve seat assembly to be arranged in a sliding mode, the second valve seat assembly comprises a second valve seat body and a pneumatic control component, the inner wall of the valve body is provided with an air cavity allowing the second valve seat body to be closed, and the pneumatic control component penetrates through the outer wall of the valve body to be communicated with the air cavity. The first valve seat assembly and the second valve seat assembly respectively adopt different movable mounting structures, and can be simultaneously kept in sealing fit with the ball core, so that the abrasion of a sealing surface is effectively reduced, the service life of the valve seat is prolonged, the service life of the valve seat is prolonged, the service life of the valve seat is prolonged, and the service life of the valve seat is prolonged. Good sealing performance can be kept for a long time, and the service life is longer.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a ball valve. Background Technology

[0002] A ball valve is a valve in which the opening and closing element, namely a ball, is driven by the valve stem and rotates around the axis of the ball valve. It can also be used for fluid regulation and control. This type of valve should generally be installed horizontally in the pipeline. Its main characteristics are compact structure, high reliability, and ease of operation and maintenance.

[0003] Existing ball valves typically use a metal valve seat and a ball core for hard sealing. With long-term use, ball valves need to be opened and closed frequently, and the frequent friction between the ball core and the valve seat leads to severe wear of the valve seat, which in turn reduces the sealing performance and shortens the service life. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings and deficiencies of the existing technology and to provide a ball valve. The first valve seat assembly and the second valve seat assembly of this utility model adopt different movable installation structures, while maintaining a sealing fit with the ball core at the same time, effectively reducing the wear of the sealing surface, maintaining good sealing performance for a long time, and having a longer service life.

[0005] The technical solution adopted by this utility model is as follows: a ball valve, including a valve body, a valve cover, a valve stem, a ball core, and an actuator. The valve cover is disposed at one end of the valve body, and a channel is opened inside the valve body. The ball core is rotatably disposed in the channel. One end of the valve stem is connected to the ball core, and the other end passes through the valve cover and is connected to the actuator. It also includes a first valve seat assembly and a second valve seat assembly respectively disposed on both sides of the ball core. The ball core and the first and second valve seat assemblies on both sides are simultaneously sealed and fitted to divide the channel into an inlet channel and an outlet channel. The inner wall of the valve body is provided with an installation groove for the first valve seat assembly to slide. The second valve seat assembly includes a second valve seat body and a pneumatic control component. An air cavity for the second valve seat body to be closed is opened in the inner wall of the valve body. The pneumatic control component passes through the outer wall of the valve body and communicates with the air cavity. The second valve seat body is inflated into the air cavity by the pneumatic control component to maintain a sealed fit with the ball core.

[0006] The second valve seat assembly also includes a valve seat cover. The inner wall of the valve body is provided with a step for the valve seat cover to be fastened on one side of the air chamber. The cross-section of the second valve seat body is U-shaped. One side of the second valve seat body is embedded in the inner wall of the valve body, and the other side is tightly pressed against the step by the valve seat cover. The middle part of the second valve seat body is sealed with the ball core.

[0007] The pneumatic control component has a first state of inflating the air chamber, a second state of discharging the gas inside the air chamber to the outside of the valve body, and a third state of keeping the air chamber isolated from the outside of the valve body.

[0008] The first valve seat assembly includes a first valve seat body and a mounting base. When the second valve seat body and the ball core maintain a sealed fit, the first valve seat body and the ball core also maintain a sealed fit.

[0009] The cross-section of the first valve seat is a right-angled triangle, and the right-angled end of the first valve seat is used to seal with the ball core.

[0010] The mounting base is provided with an inclined groove that is adapted to the first valve seat body. The mounting base also has a limit ring protruding on the side near the ball core. When the first valve seat body and the ball core are sealed together, a compensation gap is formed between the first valve seat body and the limit ring.

[0011] The first valve seat body has a raised ring on the inclined surface away from the right-angle end.

[0012] The end of the limiting ring is provided with a rounded corner.

[0013] The beneficial effects of this utility model are as follows: This utility model achieves a sealing fit by setting a first valve seat assembly and a second valve seat assembly on both sides of the ball core. The first valve seat assembly adopts a sliding installation method, and the second valve seat assembly adopts an inflatable installation method. When the second valve seat assembly maintains a sealing fit with the ball core through inflation, the first valve seat assembly also maintains a sealing fit with the ball core at the same time. By adopting different movable installation structures, it can maintain a sealing fit with the ball core at the same time, effectively reducing the wear of the sealing surface, maintaining good sealing performance for a long time, and extending the service life. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0015] Figure 1 This is a schematic diagram of the structure of the ball valve of this utility model;

[0016] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle;

[0017] Figure 3 for Figure 1 A magnified view of a portion of point B in the middle;

[0018] In the diagram, 1-valve body, 2-valve cover, 3-valve stem, 4-ball core, 5-actuator, 6-inlet channel, 7-outlet channel, 8-mounting groove, 9-second valve seat body, 10-pneumatic control component, 11-air chamber, 12-valve seat cover, 13-step, 14-first valve seat body, 15-mounting base, 16-sloping groove, 17-limiting ring, 18-compensation gap, 19-convex ring, 20-rounded angle. Detailed Implementation

[0019] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0020] It should be noted that all uses of "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0021] The directional and positional terms used in this utility model, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are merely for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0022] like Figures 1 to 3 As shown, this is an embodiment of the present invention. A ball valve includes a valve body 1, a valve cover 2, a valve stem 3, a ball core 4, and an actuator 5. The valve cover 2 is disposed at one end of the valve body 1. A channel is formed inside the valve body 1. The ball core 4 is rotatably disposed within the channel. One end of the valve stem 3 is connected to the ball core 4, and the other end passes through the valve cover 2 and is connected to the actuator 5. The valve body 1 also includes a first valve seat assembly and a second valve seat assembly respectively disposed on both sides of the ball core 4. The ball core 4 and the first and second valve seat assemblies on both sides simultaneously form a sealing fit, dividing the channel into an inlet channel 6 and an outlet channel 7. The inner wall of the valve body 1 has a mounting groove 8 for the first valve seat assembly to slide. The second valve seat assembly includes a second valve seat body 9 and a pneumatic control component 10. The inner wall of the valve body 1 has an air cavity 11 for the second valve seat body 9 to be sealed. The pneumatic control component 10 passes through the outer wall of the valve body 1 and communicates with the air cavity 11. The second valve seat body 9 is inflated into the air cavity 11 by the pneumatic control component 10 to maintain a sealing fit with the ball core 4.

[0023] The beneficial effects of this design are as follows: This utility model uses a first valve seat assembly and a second valve seat assembly respectively on both sides of the ball core for sealing cooperation. The first valve seat assembly adopts a sliding installation method, and the second valve seat assembly adopts an inflatable installation method. When the second valve seat assembly is inflated and maintains a sealing cooperation with the ball core, the first valve seat assembly also maintains a static sealing cooperation with the ball core at the same time. By adopting different movable installation structures, they can maintain a sealing cooperation with the ball core at the same time, effectively reducing the wear of the sealing surface, maintaining good sealing performance for a long time, and extending the service life. In this embodiment, the second valve seat body is made of rubber material, which has strong deformation ability and can deform after inflation to form an elastic seal with the ball core.

[0024] Furthermore, the second valve seat assembly also includes a valve seat cover 12. The inner wall of the valve body 1 is provided with a step 13 on one side corresponding to the air chamber 11 for the valve seat cover 12 to be fastened. The cross-section of the second valve seat body 9 is U-shaped. One side of the second valve seat body 9 is embedded in the inner wall of the valve body 1, and the other side is tightly abutted against the step 13 by the valve seat cover 12. The middle part of the second valve seat body 9 is sealed with the ball core 4.

[0025] The beneficial effects of this design are as follows: the valve seat cover snaps together to abut and limit the second valve seat body against the inner wall of the valve seat, the second valve seat body keeps the air chamber closed to prevent gas leakage, and after the air chamber is filled with air, the top of the U-shaped second valve seat body bulges up and abuts against the ball core to form a sealed fit.

[0026] Furthermore, the pneumatic control component 10 has a first state of inflating the air chamber 11, a second state of discharging the gas inside the air chamber 11 to the outside of the valve body 1, and a third state of keeping the air chamber 11 isolated from the outside of the valve body 1.

[0027] The beneficial effects of this configuration are as follows: the first state of the pneumatic control component is used for the deformation of the second valve seat body to seal with the ball core during installation; the second state is used for the second valve seat body to return to its original position and move away from the ball core during disassembly and maintenance; and the third state is used for the second valve seat body and the ball core to maintain a sealed fit after installation to prevent air leakage.

[0028] In a further configuration, the first valve seat assembly includes a first valve seat body 14 and a mounting base 15. When the second valve seat body 9 and the ball core 4 maintain a sealed fit, the first valve seat body 14 also maintains a sealed fit with the ball core 4.

[0029] The benefits of this design are as follows: bidirectional sealing; although the installation structure and method are different, they can both maintain good sealing performance, and they are easy to disassemble and assemble.

[0030] Further, the cross-section of the first valve seat body 14 is a right-angled triangle, and the right-angled end of the first valve seat body 14 is used for sealing cooperation with the ball core 4.

[0031] The beneficial effects of this design are as follows: the right-angled triangle structure is stable, has higher structural strength, and a longer service life. In this embodiment, the right-angled ends can be rounded to increase the contact area and further improve sealing performance.

[0032] Furthermore, the mounting base 15 is provided with an inclined groove 16 that is adapted to the first valve seat body 14, and a limiting ring 17 protrudes on the side of the mounting base 15 near the ball core 4. When the first valve seat body 14 and the ball core 4 are sealed together, a compensation gap 18 is formed between the first valve seat body 14 and the limiting ring 17.

[0033] The beneficial effects of this design are as follows: the first valve seat body is slidably positioned within the inclined groove of the mounting base and is limited by a limiting ring to prevent it from detaching from the inclined groove. When the first valve seat body is engaged with the ball core seal, the inclined surface of the first valve seat body away from the right-angle end abuts against the inner wall of the inclined groove, and the right-angle side abuts against the inner wall of the mounting groove, forming a stable and static state. The compensation gap is used for the sliding of the first valve seat body. The first valve seat assembly and the second valve seat assembly are linked. When the second valve seat body deforms, the first valve seat body slides away from the limiting ring. The movable seal has better wear resistance than the hard seal.

[0034] Furthermore, a raised ring 19 is provided on the inclined surface of the first valve seat body 14 away from the right-angle end.

[0035] The beneficial effects of this design are as follows: the convex ring on the first valve seat body forms a point contact with the mounting base, reducing wear between the first valve seat body and the mounting base, and also maintaining good sealing performance.

[0036] Furthermore, the end of the limiting ring 17 is provided with an arc angle 20.

[0037] The beneficial effects of this design are as follows: the rounded corner is used to limit the ring to slide into the inclined groove, making it easy to disassemble and assemble.

[0038] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A ball valve, comprising a valve body (1), a valve cover (2), a valve stem (3), a ball core (4), and an actuator (5), wherein the valve cover (2) is disposed at one end of the valve body (1), a channel is provided inside the valve body (1), the ball core (4) is rotatably disposed within the channel, one end of the valve stem (3) is connected to the ball core (4), and the other end passes through the valve cover (2) and is connected to the actuator (5), characterized in that: It also includes a first valve seat assembly and a second valve seat assembly respectively disposed on both sides of the ball core (4). The ball core (4) and the first valve seat assembly and the second valve seat assembly on both sides are simultaneously sealed and fitted to divide the channel into an inlet channel (6) and an outlet channel (7). The inner wall of the valve body (1) is provided with an installation groove (8) for the first valve seat assembly to slide. The second valve seat assembly includes a second valve seat body (9) and a pneumatic control component (10). The inner wall of the valve body (1) is provided with an air cavity (11) for the second valve seat body (9) to be closed. The pneumatic control component (10) penetrates the outer wall of the valve body (1) and communicates with the air cavity (11). The second valve seat body (9) is inflated into the air cavity (11) through the pneumatic control component (10) to maintain a sealed fit with the ball core (4).

2. The ball valve according to claim 1, characterized in that: The second valve seat assembly also includes a valve seat cover (12). The inner wall of the valve body (1) is provided with a step (13) for the valve seat cover (12) to be fastened on one side of the air chamber (11). The cross-section of the second valve seat body (9) is U-shaped. One side of the second valve seat body (9) is embedded in the inner wall of the valve body (1), and the other side is tightly pressed against the step (13) through the valve seat cover (12). The middle part of the second valve seat body (9) is sealed with the ball core (4).

3. The ball valve according to claim 1, characterized in that: The pneumatic control component (10) has a first state of inflating the air chamber (11), a second state of discharging the gas inside the air chamber (11) to the outside of the valve body (1), and a third state of keeping the air chamber (11) isolated from the outside of the valve body (1).

4. The ball valve according to claim 1, characterized in that: The first valve seat assembly includes a first valve seat body (14) and a mounting base (15). When the second valve seat body (9) and the ball core (4) maintain a sealed fit, the first valve seat body (14) also maintains a sealed fit with the ball core (4).

5. The ball valve according to claim 4, characterized in that: The first valve seat body (14) has a right-angled triangle cross section, and the right-angled end of the first valve seat body (14) is used for sealing with the ball core (4).

6. The ball valve according to claim 5, characterized in that: The mounting base (15) is provided with a slanted groove (16) that is adapted to the first valve seat body (14). A limiting ring (17) is also raised on the side of the mounting base (15) near the ball core (4). When the first valve seat body (14) and the ball core (4) are sealed together, a compensation gap (18) is formed between the first valve seat body (14) and the limiting ring (17).

7. The ball valve according to claim 6, characterized in that: The first valve seat body (14) has a raised ring (19) on the inclined surface away from the right angle end.

8. The ball valve according to claim 6, characterized in that: The end of the limiting ring (17) is provided with a rounded corner (20).

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