Three / four eccentric butterfly valve inner cavity adjustable limit structure

Abstract

This utility model belongs to the field of valve body technology, and relates to an adjustable limiting structure for the inner cavity of a three / four eccentric butterfly valve. It includes a valve body, the inner wall of which is integrally cast into a valve seat. A valve plate is rotatably mounted in the inner cavity of the valve body via a valve shaft, and the valve plate is connected to the valve shaft via a pin. A sealing ring is also provided on the valve plate; when the valve plate is in the closed state, the sealing ring is pressed against the valve seat. A mounting platform is provided on the back of the valve plate away from the valve shaft, and a limiting plate is fixedly connected to the mounting platform. A sealing ring is also provided on the valve plate; when the valve plate is in the closed state, the sealing ring is pressed against the valve seat, and the valve plate is connected to the valve shaft via a pin. This adjustable limiting structure has a novel design, precise limiting, convenient disassembly and maintenance, is not easily damaged, and has high processing reliability. It is flexible, simple to use, and highly practical.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology and relates to an adjustable limiting structure for the inner cavity of a three / four eccentric butterfly valve. Background Technology

[0002] Three / four eccentric butterfly valves evolved from double eccentric butterfly valves, transforming the original double eccentric butterfly valve's line seal into a surface seal. They rely on the actuator's torque to provide a specific pressure to the sealing surface, achieving valve sealing. Different actuators have varying output torque values, especially some spring-loaded single-acting actuators, where the opening and closing torques differ significantly. During selection, to meet the opening torque, the actuator's closing torque often exceeds the valve's required closing torque. When the valve closes, the medium pressure difference acts on the valve plate and is transmitted to the sealing surface, increasing its specific pressure. Excessive sealing specific pressure can cause excessive compression of the sealing ring, indirectly leading to warping and deformation of the sealing ring, ultimately affecting the valve's sealing performance and service life.

[0003] Some valve actuators also have their own stroke limit devices. For example, the gear and rack actuator uses a section of arc on the shaft and the end face of the hexagonal bolt to form a limit. However, due to the problem of the force angle, the hexagonal bolt is prone to bending and other phenomena, which is unreliable. Or, if the actuator needs to be rotated during installation on site, and the fasteners connecting the actuator and the valve are loosened and then tightened, the relationship between the limit mechanism of the actuator and the sealing position of the valve becomes uncertain. Therefore, three / four eccentric butterfly valves need a mechanical limit to ensure the normal and safe use of the valve.

[0004] Three / four eccentric butterfly valves typically employ an integrated valve seat and body structure, resulting in high overall valve seat rigidity. The valve seat sealing surface is machined around the eccentric center line, and the switching position direction within the valve body cavity falls within this machining rotation area. Therefore, the traditional limiting structure of three / four eccentric butterfly valves generally uses a welded limiting block within the valve body cavity. This limiting structure is prone to welding deformation during block assembly, and during use, wear or damage to the blocking block leads to inconvenient maintenance and replacement. Summary of the Invention

[0005] To address the aforementioned problems, this utility model provides an adjustable limiting structure for the inner cavity of a three / four eccentric butterfly valve. This adjustable limiting structure features a novel design, precise limiting, convenient disassembly and maintenance, is not easily damaged, and has high processing reliability. It is also flexible, convenient, and highly practical in use.

[0006] According to the technical solution of this utility model: an adjustable limiting structure for the inner cavity of a three / four eccentric butterfly valve, characterized in that: it includes a valve body, the inner wall of which is integrally cast valve seat, and the valve plate is rotatably disposed in the inner cavity of the valve body through a valve shaft;

[0007] A mounting platform is provided on the back of the valve plate at the end away from the valve shaft, and a limiting plate is fixedly connected to the mounting platform;

[0008] A sealing ring is also provided on the valve plate. When the valve plate is in the closed state, the sealing ring is pressed against the valve seat.

[0009] As a further improvement of this utility model, the valve plate is connected to the valve shaft by a pin.

[0010] As a further improvement of this utility model, two threaded blind holes are provided on the mounting platform, and two oblong through holes are provided on the limiting plate. The oblong through holes cooperate with the threaded blind holes. A spring washer is fitted on the hexagon socket head cap screw. After the hexagon socket head cap screw passes through the oblong through hole, it connects with the threaded blind hole to fix the limiting plate on the mounting platform.

[0011] As a further improvement of this utility model, the limiting plate is L-shaped, with its long side attached to the mounting platform and its short side attached to the outer end face of the valve plate. When the valve plate is closed, the limiting plate abuts against the valve seat to form a limiting position.

[0012] As a further improvement of this utility model, the sealing ring is pressed and fixed to the valve plate by a pressure plate and screws.

[0013] As a further improvement of this utility model, the sealing surface of the valve seat has a section of inclined conical surface and a section of side plane, the side plane being a limiting surface to prevent the valve from being over-closed.

[0014] The technical advantages of this utility model are as follows: the product has a reasonable and ingenious structure, novel design, and precise positioning; the product is easy to disassemble, assemble, and maintain, not easily damaged, and highly reliable; the installation position is adjustable, flexible and convenient, and highly practical; the product and mechanical positioning form a double positioning guarantee, ensuring high safety and reliability. Attached Figure Description

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

[0016] Figure 2 for Figure 1 A magnified view of a portion of the image from direction A.

[0017] Figure 3 for Figure 1 A magnified view of the middle limit plate from direction A. Detailed Implementation

[0018] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0019] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. The described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0020] Figure 1-3 The components include valve body 1, valve seat 1.1, sealing ring 2, valve plate 3, mounting platform 3.1, threaded blind hole 3.2, valve shaft 4, pin 5, internal hexagonal head screw 6, standard spring washer 7, limit plate 8, waist-shaped through hole 8.1, etc.

[0021] like Figure 1-3 As shown, this utility model is an adjustable limiting structure for the inner cavity of a three / four eccentric butterfly valve, including a valve body 1, the inner wall of the valve body 1 being integrally cast valve seat 1.1, and a valve plate 3 being rotatably disposed in the inner cavity of the valve body 1 via a valve shaft 4.

[0022] A mounting platform 3.1 is provided on the back of the valve plate 3 at the end away from the valve shaft 4, and a limiting plate 8 is fixedly connected to the mounting platform 3.1.

[0023] A sealing ring 2 is also provided on the valve plate 3. When the valve plate 3 is in the closed state, the sealing ring 2 is pressed against the valve seat 1.1.

[0024] The valve plate 3 is connected to the valve shaft 4 via the pin 5. During operation, when the valve shaft 4 rotates 90° clockwise, causing the valve plate 3, sealing ring 2, and other parts to close, the limiting plate 8 and the side plane of the valve seat 1.1 near the end of the valve shaft 4 achieve planar limiting.

[0025] The mounting platform 3.1 has two threaded blind holes 3.2, and the limiting plate 8 has two oblong through holes 8.1. The oblong through holes 8.1 mate with the threaded blind holes 3.2. A spring washer 7 is fitted onto the hexagon socket head cap screw 6. The hexagon socket head cap screw 6 passes through the oblong through holes 8.1 and connects to the threaded blind holes 3.2, fixing the limiting plate 8 to the mounting platform 3.1. When the valve is closed, the spring washer 7 prevents loosening.

[0026] The limiting plate 8 is L-shaped. The long side of the limiting plate 8 is attached to the mounting platform 3.1, and the short side of the limiting plate 8 is attached to the outer end face of the valve plate 3. When the valve plate 3 is closed, the limiting plate 8 abuts against the valve seat 1.1 to form a limit.

[0027] The sealing ring 2 is pressed and fixed to the valve plate 3 by a pressure plate and screws.

[0028] The sealing surface of valve seat 1.1 has a section of inclined conical surface and a section of side plane, the side plane being a limiting surface to prevent the valve from being over-closed.

[0029] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A three / four eccentric butterfly valve inner cavity adjustable limit structure, characterized in that: Includes a valve body (1), the inner wall of which is integrally cast into a valve seat (1.1), and a valve plate (3) is rotatably disposed in the inner cavity of the valve body (1) via a valve shaft (4); A mounting platform (3.1) is provided on the back of the valve plate (3) away from the valve shaft (4), and a limiting plate (8) is fixedly connected on the mounting platform (3.1). A sealing ring (2) is also provided on the valve plate (3). When the valve plate (3) is in the closed state, the sealing ring (2) is pressed against the valve seat (1.1).

2. The adjustable stop structure for the inner cavity of a three / four eccentric butterfly valve according to claim 1, characterized in that: The valve plate (3) is connected to the valve shaft (4) by a pin (5).

3. The adjustable stop structure for the three / four eccentric butterfly valve inner cavity according to claim 1, characterized in that: The mounting platform (3.1) is provided with two threaded blind holes (3.2), and the limiting plate (8) is provided with two waist-shaped through holes (8.1). The waist-shaped through holes (8.1) are matched with the threaded blind holes (3.2). A spring washer (7) is fitted on the internal hexagonal head screw (6). The internal hexagonal head screw (6) passes through the waist-shaped through hole (8.1) and connects with the threaded blind hole (3.2) to fix the limiting plate (8) on the mounting platform (3.1).

4. The adjustable stop structure for the inner cavity of a three / four eccentric butterfly valve according to claim 3, characterized in that: The limiting plate (8) is L-shaped. The long side of the limiting plate (8) is attached to the mounting platform (3.1), and the short side of the limiting plate (8) is attached to the outer end face of the valve plate (3). When the valve plate (3) is closed, the limiting plate (8) abuts against the valve seat (1.1) to form a limit.

5. The adjustable limiting structure for the inner cavity of a three / four eccentric butterfly valve as described in claim 1, characterized in that: The sealing ring (2) is pressed and fixed to the valve plate (3) by a pressure plate and screws.

6. The adjustable stop structure for the three / four eccentric butterfly valve inner cavity according to claim 1, characterized in that: The sealing surface of the valve seat (1.1) has a section of oblique conical surface and a section of side plane, the side plane being a limiting surface to prevent the valve from being over-closed.

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