Double eccentric butterfly valve

Abstract

The application relates to the technical field of valves and discloses a double-eccentric butterfly valve which comprises a valve body, a valve seat, a valve clack, a valve rod, a supporting ring, a valve seat gasket ring and a limiting sleeve. An installation groove which is open to the inside of a flow passage opening is arranged on the side wall of the flow passage opening in the valve body; the valve seat is installed in the installation groove and partially protrudes from the installation groove; the valve clack is installed in the flow passage of the valve body through the valve rod, and the valve clack has a closed state of abutting and sealing with the valve seat to close the flow passage and an open state of being separated from the valve clack to open the flow passage. In the application, the valve seat is directly fixed in the valve body, so that the problems such as the fact that the effective sealing surface is narrowed and leakage is prone to occur when the gasket is pressed on the non-integral structure of the flange end face during pipeline installation, the fact that the screw connection of the fixed press-fitting ring sleeve is non-integral, and the fact that the screw is prone to loosening when the pipeline vibrates can be avoided.

Description

Technical Field

[0001] This invention relates to the field of valve technology, specifically to a double eccentric butterfly valve. Background Technology

[0002] Double eccentric butterfly valves, also known as high-performance butterfly valves, are mainly used for drainage in systems such as water plants, power plants, steel mills, chemical plants, water source projects, and environmental facilities construction. They are especially suitable for use in water pipelines as regulating and shut-off devices.

[0003] The prior art discloses a double eccentric butterfly valve, including a valve body, a valve plate installed in the flow channel of the valve body via upper and lower valve stems, and a sealing valve seat installed on one side of the flow channel of the valve body and forming a sealing pair with the sealing surface of the valve plate. The sealing valve seat is installed in a T-shaped annular groove machined around the inner wall of the flow channel of the valve body via a press-fitting ring sleeve with a flange at its end.

[0004] However, the aforementioned double eccentric butterfly valve uses a flanged press-fit ring to press the sealing valve seat onto the valve body. This structure has the following disadvantages:

[0005] Firstly, the flange end face is not a complete structure. When the pipeline is installed, the effective sealing surface of the gasket is narrowed when it is pressed on this surface, which can easily lead to leakage.

[0006] Secondly, the pressure ring screw connection is not integral, and the screw is prone to loosening when the pipeline vibrates. Summary of the Invention

[0007] In view of this, the present invention provides a double eccentric butterfly valve to solve the problem caused by pressing the sealing valve seat onto the valve body through a press-fitting ring in the current double eccentric butterfly valve.

[0008] In a first aspect, the present invention provides a double eccentric butterfly valve, comprising:

[0009] The valve body has an installation groove on the side wall of the internal flow channel opening that opens inward toward the inside of the flow channel.

[0010] A valve seat is installed inside the mounting groove and partially protrudes from the mounting groove;

[0011] A valve disc is installed in the flow channel of the valve body via a valve stem. The valve disc has a closed state in which it abuts against the valve seat to seal and close the flow channel, and an open state in which it separates from the valve disc to open the flow channel.

[0012] In one optional embodiment, the outer ring of the valve seat is provided with an arc-shaped groove recessed inward toward the inside of the valve seat, and the remaining part of the outer ring of the valve seat abuts against the bottom wall of the mounting groove.

[0013] In one alternative embodiment, the valve seat near the outlet end of the internal flow channel abuts against the side wall of the mounting groove, and this side wall of the valve seat and the side wall of the mounting groove are interference fit.

[0014] In one alternative embodiment, the inner ring of the valve seat protrudes from the mounting groove, and the inner ring of the valve seat is a slope shape adapted to the shape of the valve disc sealing surface.

[0015] In one alternative embodiment, the valve seat is annular.

[0016] In one alternative embodiment, the double eccentric butterfly valve further includes a support ring disposed in a limiting groove on the valve body. The support ring is located on the side of the valve seat near the valve stem to provide the valve seat with a pressing force toward the outlet end of the internal flow channel.

[0017] In one alternative embodiment, a space is configured between the support ring and the valve seat, and the support ring is provided with a drainage hole that connects the valve body flow channel to this space.

[0018] In one alternative embodiment, the double eccentric butterfly valve further includes a seat gasket disposed between the support ring and the valve seat, the seat gasket being configured to create a space between the support ring and the valve seat.

[0019] In one alternative embodiment, the double eccentric butterfly valve further includes a limiting sleeve, which is fitted onto the surface of the valve stem and abuts against the side of the support ring away from the valve seat.

[0020] In one alternative implementation, the support ring is a four-open ring.

[0021] This invention provides a double eccentric butterfly valve, which has the following advantages:

[0022] 1. The present invention provides a double eccentric butterfly valve, comprising a valve body, a valve seat, and a valve disc. The valve body has an installation groove on the side wall of the flow channel opening inward toward the flow channel opening. The valve seat is installed inside the installation groove and partially protrudes from the installation groove. The valve disc is installed in the flow channel of the valve body through a valve stem. The valve disc has a closed state in which it abuts against the valve seat to seal and close the flow channel, and an open state in which it separates from the valve seat to open the flow channel.

[0023] This double eccentric butterfly valve features an installation groove on the side wall of the flow channel inside the valve body, opening inwards towards the flow channel. A valve seat is installed inside this groove, protruding slightly from it. When the flow channel needs to be closed, the valve stem rotates the valve disc, causing its sealing surface to contact and seal with the valve seat, thus closing the flow channel. Similarly, when the flow channel needs to be opened, the valve stem rotates the valve disc, causing its sealing surface to separate from the valve seat. Compared to current methods that use a flanged press-fit ring to fix the valve seat to the valve body, this invention directly fixes the valve seat inside the valve body. This avoids problems such as the narrowing of the effective sealing surface due to the incomplete flange end face during pipeline installation, leading to leakage, and the loosening of the screws used to fix the press-fit ring due to pipeline vibration.

[0024] 2. The present invention provides a double eccentric butterfly valve, wherein the outer ring of the valve seat is provided with an arc-shaped groove recessed inward toward the inside of the valve seat, and the remaining part of the outer ring of the valve seat abuts against the bottom wall of the mounting groove.

[0025] The double eccentric butterfly valve with this structure features an arc-shaped groove on the outer ring of the valve seat. This design serves two purposes: first, it reduces the contact area between the valve body and the sealing surface of the outer ring of the valve seat, thereby increasing the sealing pressure and improving sealing performance; second, it increases the elasticity of the valve seat and controls the sealing pressure between the valve seat and the valve disc.

[0026] 3. The present invention provides a double eccentric butterfly valve, wherein the side wall of the valve seat near the outlet end of the internal flow channel abuts against the side wall of the mounting groove, and the side wall of the valve seat and the side wall of the mounting groove are interference fit.

[0027] In this double eccentric butterfly valve, when the valve is closed, the valve disc sealing surface gradually compresses the valve seat. At this point, the valve seat and valve disc sealing surfaces reach a sealing pressure, achieving a seal between them. Because the valve disc compresses the valve seat, the valve seat deforms, creating a sealing pressure between the valve seat and its outer sealing surface, thus achieving a seal. Furthermore, the outer sealing surface of the valve seat has an arc-shaped groove. When the valve disc compresses the valve seat, the bottom of the valve seat expands to both sides, increasing the pressure between the valve seat and its side sealing surfaces, achieving a reliable second seal. Simultaneously, due to the arc-shaped groove on the outer sealing surface of the valve seat, the pressure ratio between the valve seat and valve disc sealing surfaces can be well controlled, thus making the valve torque controllable.

[0028] 4. The present invention provides a double eccentric butterfly valve, wherein a space is configured between the support ring and the valve seat, and the support ring is provided with a flow hole that connects the valve body flow channel to this space.

[0029] This double eccentric butterfly valve has a space between the support ring and the valve seat, and the support ring has a drainage hole that connects the valve body flow channel to this space. When in use, the medium inside the valve body flow channel fills the space between the support ring and the valve seat after passing through the drainage hole. The medium force can push the valve seat, which increases the specific pressure between the valve seat and the sealing surface on the side of the valve seat, thereby increasing its sealing performance.

[0030] 5. This invention provides a double eccentric butterfly valve, wherein the valve disc sealing surface is designed as a spherical surface, and the valve stem mounting shaft is offset from the sealing surface, forming two eccentricities, one vertically and one horizontally. That is, when the valve disc is opened at a certain angle, the valve disc sealing surface is completely separated from the valve seat sealing surface, so that the valve seat is in a completely free state, thereby extending the valve seat life. Attached Figure Description

[0031] To more clearly illustrate the specific embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a schematic structural view of the double eccentric butterfly valve provided in an embodiment of the present invention;

[0033] Figure 2 for Figure 1 Enlarged view of the structure at point A in the middle circle;

[0034] Figure 3 This is a schematic structural view of the valve disc provided in an embodiment of the present invention.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1-Valve body;

[0037] 2-Valve seat;

[0038] 3-Valve disc;

[0039] 4-Valve stem;

[0040] 5-Support ring;

[0041] 6-Valve seat gasket;

[0042] 7-Limit sleeve;

[0043] 8- Drainage hole. Detailed Implementation

[0044] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, the technical features involved in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

[0046] Example

[0047] This embodiment provides a double eccentric butterfly valve, such as Figure 1 As shown, it includes valve body 1, valve seat 2, valve disc 3, valve stem 4, support ring 5, valve seat gasket ring 6, and limit sleeve 7.

[0048] In this embodiment, the valve body 1 has an installation groove on the side wall of the flow channel opening that opens inward toward the flow channel opening; the valve seat 2 is installed inside the installation groove and partially protrudes from the installation groove; the valve disc 3 is installed in the flow channel of the valve body 1 through the valve stem 4, and the valve disc 3 has a closed state that abuts against the valve seat 2 to seal and close the flow channel, and an open state that separates from the valve disc 3 to open the flow channel.

[0049] A mounting groove with an opening towards the inside of the flow channel is provided on the side wall of the flow channel inside the valve body 1. A valve seat 2 is installed inside the mounting groove, and after installation, a portion of the valve seat 2 protrudes from the groove. When it is necessary to close the flow channel of the valve body 1, the valve stem 4 drives the valve disc 3 to rotate, causing the sealing surface of the valve disc 3 to abut against the valve seat 2, thus achieving closure of the flow channel of the valve body 1. Similarly, when it is necessary to open the flow channel inside the valve body 1, the valve stem 4 drives the valve disc 3 to rotate, causing the sealing surface of the valve disc 3 to separate from the valve seat 2. Compared to the current method of fixing the sealing valve seat to the valve body using a press-fit ring with a flange, this embodiment directly fixes the valve seat 2 inside the valve body 1. This avoids problems such as the narrowing of the effective sealing surface due to the incomplete structure of the flange end face during pipeline installation, leading to leakage, and the loosening of the screws used to fix the press-fit ring due to pipeline vibration.

[0050] In this embodiment, as Figure 2 As shown, the outer ring of the valve seat 2 is provided with an arc-shaped groove that is recessed inward towards the inside of the valve seat 2, and the rest of the outer ring of the valve seat 2 abuts against the bottom wall of the mounting groove.

[0051] When in use, the arc-shaped groove design of the outer ring of valve seat 2 serves two purposes: first, it reduces the contact area between the valve body 1 and the sealing surface of the outer ring of valve seat 2, thereby increasing the sealing pressure and achieving better sealing; second, it increases the elasticity of valve seat 2 and controls the sealing pressure between valve seat 2 and valve disc 3.

[0052] In this embodiment, as Figure 2 As shown, the side wall of valve seat 2 near the outlet end of the internal flow channel abuts against the side wall of the mounting groove, and this side wall of valve seat 2 and the side wall of the mounting groove are interference fit.

[0053] When the valve is closed, the sealing surface of valve disc 3 gradually compresses valve seat 2. At this time, the sealing surfaces of valve seat 2 and valve disc 3 reach a sealing pressure, and a seal is achieved between valve seat 2 and valve disc 3. As valve disc 3 squeezes valve seat 2, valve seat 2 expands and deforms, forming a sealing pressure between valve seat 2 and the outer ring sealing surface of valve seat 2, thus achieving a seal. In addition, an arc-shaped groove is designed on the outer ring sealing surface of valve seat 2. When valve disc 3 compresses valve seat 2, the bottom of valve seat 2 expands to both sides, and the pressure between valve seat 2 and the side sealing surfaces of valve seat 2 also increases, achieving a reliable second seal. At the same time, due to the existence of the arc-shaped groove on the outer ring sealing surface of valve seat 2, the pressure ratio between the sealing surfaces of valve seat 2 and valve disc 3 can be well controlled, thus making the valve torque controllable.

[0054] In specific implementation methods, such as Figure 2 As shown, the inner ring of the valve seat 2 protrudes from the mounting groove, and the inner ring of the valve seat 2 is a slope shape adapted to the sealing surface of the valve disc 3. This structural design allows the inner ring of the valve seat 2 to better adapt to the sealing surface of the valve disc 3. In this embodiment, the valve seat 2 is annular in shape and made of polytetrafluoroethylene.

[0055] In this embodiment, as Figure 1 and Figure 2 As shown, the support ring 5 is located in the limiting groove on the valve body 1. The support ring 5 is located on the side of the valve seat 2 near the valve stem 4 to provide the valve seat 2 with a pressing force towards the outlet end of the internal flow channel.

[0056] During assembly, a support ring 5 is provided on the side of the valve seat 2 near the valve stem 4. The support ring 5 can abut against the side of the valve seat 2 near the valve stem 4. When the valve is closed, the sealing surface of the valve disc 3 gradually compresses the valve seat 2. During this process, the support ring 5 provides the valve seat 2 with a squeezing force towards the outlet end of the internal flow channel, ensuring that the valve disc 3 squeezes the valve seat 2. When the valve seat 2 is stretched and deformed, a sealing pressure is formed between the valve seat 2 and the outer sealing surface of the valve seat 2, thereby achieving a seal. It is also ensured that when the valve disc 3 compresses the valve seat 2, the bottom of the valve seat 2 is pushed open to both sides, and the pressure between the valve seat 2 and the side sealing surface of the valve seat 2 can be increased, thereby achieving the second seal mentioned above.

[0057] In this embodiment, as Figure 2 As shown, a space is provided between the support ring 5 and the valve seat 2, and the support ring 5 is provided with a flow hole 8 that connects the flow channel of the valve body 1 to this space.

[0058] In use, by setting a space between the support ring 5 and the valve seat 2, and the support ring 5 is provided with a drainage hole 8 that connects the flow channel of the valve body 1 to this space, the medium inside the flow channel of the valve body 1 fills the space between the support ring 5 and the valve seat 2 after passing through the drainage hole 8. The medium force can push the valve seat 2, thereby increasing the specific pressure between the valve seat 2 and the sealing surface on the side of the valve seat 2, thus increasing its sealing performance.

[0059] In this embodiment, as Figure 2 As shown, the valve seat gasket 6 is disposed between the support ring 5 and the valve seat 2, and the valve seat gasket 6 is configured to create a space between the support ring 5 and the valve seat 2.

[0060] Because space needs to be provided between the support ring 5 and the valve seat 2, a valve seat gasket 6 is provided between the support ring 5 and the valve seat 2, such as... Figure 2 As shown, the valve seat gasket 6 is located on the stepped surface of the support ring 5 to prevent the valve seat gasket 6 or the valve seat 2 from blocking the drain hole 8, ensuring that the space between the drain hole 8, the support ring 5 and the valve seat 2 is connected, so that the medium inside the flow channel of the valve body 1 can smoothly pass through the drain hole 8 and fill the space between the support ring 5 and the valve seat 2.

[0061] Specifically, in this embodiment, the support ring 5 is a four-open ring.

[0062] In this embodiment, as Figure 2 As shown, the limiting sleeve 7 is fitted onto the surface of the valve stem 4 and abuts against the side of the support ring 5 away from the valve seat 2. Specifically, the support ring 5 also has a stepped surface on the side near the limiting sleeve 7, through which the support ring 5 engages and limits with the limiting sleeve 7.

[0063] In this embodiment, an integral valve body 1 is used, which eliminates the need for a pressure ring structure. The valve body 1 is only provided with an installation groove and a limiting groove, resulting in a simple structure and low processing difficulty.

[0064] In this embodiment, as Figure 3 As shown, the sealing surface of valve disc 3 is designed as a spherical surface, and the mounting shaft of valve stem 4 is offset from the sealing surface, forming two eccentricities, one in the upper and one in the lower and one in the left and right. That is, when valve disc 3 is opened at a certain angle, the sealing surface of valve disc 3 is completely separated from the sealing surface of valve seat 2, so that valve seat 2 is in a completely free state, thereby extending the service life of valve seat 2.

[0065] As an alternative implementation, a protrusion may be provided on the side wall of the mounting groove on the valve body 1. After the valve seat 2 is placed inside the mounting groove, the protrusion is embedded inside the valve seat 2, which makes the sealing performance of the valve seat 2 better.

[0066] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A double eccentric butterfly valve, characterized in that, include: Valve body (1), the valve body (1) has an installation groove on the side wall of the flow channel opening that opens inward toward the flow channel opening; Valve seat (2) is installed inside the mounting groove and partially protrudes from the mounting groove; The valve disc (3) is installed in the flow channel of the valve body (1) via the valve stem (4). The valve disc (3) has a closed state that abuts against the valve seat (2) to seal and close the flow channel, and an open state that separates from the valve seat (2) to open the flow channel. The outer ring of the valve seat (2) is provided with an arc-shaped groove that is recessed inward towards the inside of the valve seat (2), and the remaining part of the outer ring of the valve seat (2) abuts against the bottom wall of the mounting groove; The valve seat (2) abuts against the side wall of the mounting groove near the outlet end of the internal flow channel, and this side wall of the valve seat (2) and the side wall of the mounting groove are interference fit; Support ring (5), the support ring (5) is provided in the limiting groove on the valve body (1), the support ring (5) is located on the side of the valve seat (2) near the valve stem (4) to provide the valve seat (2) with a squeezing force in the direction of the outlet end of the internal flow channel; A space is provided between the support ring (5) and the valve seat (2), and the support ring (5) is provided with a flow hole (8) that connects the flow channel of the valve body (1) to this space. The inner ring of the valve seat (2) protrudes from the mounting groove, and the inner ring of the valve seat (2) is a slope shape adapted to the sealing surface shape of the valve disc (3); The valve seat (2) is annular; It also includes a limiting sleeve (7), which is fitted on the surface of the valve stem (4) and abuts against the side of the support ring (5) away from the valve seat (2).

2. The double eccentric butterfly valve according to claim 1, characterized in that, It also includes a valve seat gasket (6), which is disposed between the support ring (5) and the valve seat (2), and the valve seat gasket (6) is configured to create the space between the support ring (5) and the valve seat (2).

3. The double eccentric butterfly valve according to claim 2, characterized in that, The support ring (5) is a four-open ring.

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