Eccentric butterfly valve with four connecting rods and balance valve

Abstract

The utility model relates to a four connecting rod eccentric butterfly valve with balance valve, it includes valve body, and sets up the valve seat, butterfly plate, valve rod and connecting rod mechanism in the valve body, be equipped with pressure balance mechanism for balancing the pressure difference before and after the butterfly plate on the valve body, the pressure balance mechanism includes two balance holes and a balance pipeline, the balance hole is opened on the valve body pipe wall, two balance holes are connected to the main flow channel upstream side and main flow channel downstream side respectively in the valve body and locate the two sides of valve seat, the balance pipeline both ends are connected with two balance holes respectively and communicate, and the balance valve for controlling the on-off of balance pipeline is equipped on the balance pipeline, this four connecting rod eccentric butterfly valve with balance valve sets up the pressure balance system before and after the butterfly plate and valve seat, has realized the easy opening and closing action of valve body under the larger pipeline medium pressure difference working condition, has protected the butterfly plate and valve seat effectively simultaneously, has guaranteed the sealing effect, and has prolonged the service life.

Description

Technical Field

[0001] This utility model relates to the field of fluid control equipment technology, specifically to a four-bar eccentric butterfly valve with a balance valve that is suitable for high pressure differential conditions. Background Technology

[0002] Butterfly valves are widely used in industrial pipelines due to their simple structure, rapid opening and closing, and low flow resistance. Among them, the four-bar eccentric butterfly valve, through its unique linkage mechanism, allows the butterfly plate to quickly disengage or press against the valve seat during opening and closing, effectively reducing friction and wear on the sealing surface. However, traditional butterfly valves, including the four-bar eccentric butterfly valve, have the following problems when facing large pipeline medium pressure differentials:

[0003] (1) High operating torque: When the valve is closed, the entire sealing surface of the butterfly plate bears a huge unidirectional pressure from the upstream side, forming a huge unbalanced torque, which means that opening the valve requires a huge operating torque. Therefore, it is often necessary to configure a large-volume and expensive high-torque actuator.

[0004] (2) The sealing surface is easily damaged: At the moment of opening under pressure, the high-pressure medium will erode the edge of the butterfly plate and the sealing surface of the valve seat at extremely high speed, causing cavitation or erosion, which seriously affects the sealing performance and service life. Similarly, during the closing process, the huge pressure may also cause the butterfly plate to impact the valve seat, causing physical damage.

[0005] (3) Limited application: Due to the above reasons, traditional butterfly valves are usually only suitable for working conditions with small pressure difference (such as below 1 bar). In many fields such as chemical and energy where there is high pressure difference, it is necessary to use ball valves or gate valves, which are more expensive and have more complex structures. Utility Model Content

[0006] The technical problem to be solved by this utility model is to overcome the problems of large operating torque and easy damage to the sealing surface of traditional four-link eccentric butterfly valves when applied to high pressure differential conditions. It provides a four-link eccentric butterfly valve with a balance valve. By setting a pressure balance system before and after the butterfly plate and valve seat, it realizes easy opening and closing of the valve body under large pipeline medium pressure differential conditions, while effectively protecting the butterfly plate and valve seat, ensuring sealing effect and extending service life.

[0007] This four-link eccentric butterfly valve with a balancing valve includes a valve body with an inner cavity forming the main flow channel, a valve seat located on the outlet side of the valve body, a butterfly plate located within the valve body for sealing the valve seat, a valve stem for driving the butterfly plate, and a linkage mechanism for connecting the butterfly plate and the valve stem. The valve body is equipped with a pressure balancing mechanism for balancing the pressure difference across the butterfly plate. The pressure balancing mechanism includes two balancing holes and a balancing pipe. The balancing holes are located on the valve body wall, and the two balancing holes are respectively connected to the upstream and downstream sides of the main flow channel located on both sides of the valve seat within the valve body. The two ends of the balancing pipe are connected to and communicate with the two balancing holes, and a balancing valve is provided on the balancing pipe for controlling the opening and closing of the balancing pipe.

[0008] The optimized version is a balanced shut-off valve.

[0009] The optimized valve body is provided with an insulation jacket on the outside, and an insulation layer for the introduction of steam and other substances is formed between the outer wall of the valve body and the inner wall of the insulation jacket. The insulation jacket is provided with a heat medium inlet and a heat medium outlet.

[0010] Furthermore, valve stem sleeves for supporting valve stems are provided on both sides of the valve body. A valve stem bracket is provided on one valve stem sleeve, and a bearing is provided on the other valve stem sleeve. A stuffing box assembly for achieving dynamic sealing between the valve stem and the valve stem sleeve is provided inside the two valve stem sleeves.

[0011] Furthermore, the valve stem bracket is fixed to the outer end of the valve stem sleeve, and a gearbox and driver for driving the valve stem to rotate are installed on the valve stem bracket.

[0012] This utility model discloses a four-link eccentric butterfly valve with a balancing valve. By setting a pressure balancing system before and after the butterfly plate and valve seat, it enables the valve body to easily open and close under conditions of large pipeline medium pressure difference, while effectively protecting the butterfly plate and valve seat, ensuring sealing effect, and extending service life. Attached Figure Description

[0013] The following description, in conjunction with the accompanying drawings, further illustrates the present invention: a four-bar eccentric butterfly valve with a balance valve.

[0014] Figure 1 This is a schematic diagram of the original valve body of the four-bar eccentric butterfly valve with a balance valve.

[0015] Figure 2 yes Figure 1 A schematic diagram of the three-dimensional structure;

[0016] Figure 3 yes Figure 1 A schematic diagram of the radial longitudinal section of the valve body;

[0017] Figure 4This is a schematic diagram of the axial longitudinal section of the valve body of the four-link eccentric butterfly valve with a balance valve after the addition of a pressure balancing mechanism.

[0018] Figure 5 yes Figure 4 A magnified view of part A in the middle.

[0019] In the picture:

[0020] 1-Valve body; 11-Valve stem sleeve; 12-Valve stem support; 13-Stuffing gland assembly;

[0021] 2-Valve seat;

[0022] 3-Butterfly plate;

[0023] 4-Valve stem; 41-Linkage mechanism;

[0024] 5-Pressure balancing mechanism; 51-Balancing hole; 52-Balancing pipe; 53-Balancing valve;

[0025] 6-Insulation jacket; 61-Heat medium inlet, 62-Heat medium outlet; 601-Insulation layer;

[0026] 7-Bearings;

[0027] 8- Gearbox and drive. Detailed Implementation

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0029] In the description of this utility model, it should be understood that the terms "left", "right", "front", "rear", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0030] The present invention will be further described below with specific embodiments, but the scope of protection of the present invention is not limited to the following embodiments.

[0031] Implementation method 1: such as Figures 1 to 3 (Conventional valve body section) and Figure 4 ,5 As shown in the (features section), this four-bar eccentric butterfly valve with a balancing valve includes a valve body 1 with an inner cavity forming a main flow channel, a valve seat 2 located on the outlet side of the valve body 1, a butterfly plate 3 located within the valve body 1 for sealing the valve seat 2, a valve stem 4 for driving the butterfly plate 3, and a linkage mechanism 41 for connecting the butterfly plate 3 and the valve stem 4. The valve body 1 is provided with a pressure balancing mechanism 5 for balancing the pressure difference across the butterfly plate 3. The pressure balancing mechanism 5 includes two balancing holes 51 and a balancing pipe 52. The balancing holes 51 are located on the pipe wall of the valve body 1, and the two balancing holes 51 are respectively connected to the upstream side and downstream side of the main flow channel located on both sides of the valve seat 2 within the valve body 1. The two ends of the balancing pipe 52 are connected to and communicate with the two balancing holes 51, and a balancing valve 53 is provided on the balancing pipe 52 for controlling the opening and closing of the balancing pipe 52. The balancing valve 53 is a balancing shut-off valve.

[0032] Implementation method 2: such as Figures 1 to 4 As shown, the valve body 1 of this four-bar eccentric butterfly valve with a balancing valve is provided with an insulation jacket 6 on its outer side, and an insulation layer 601 for the introduction of steam, etc. is formed between the outer wall of the valve body 1 and the inner wall of the insulation jacket 6. The insulation jacket 6 is provided with a hot medium inlet 61 and a hot medium outlet 62. It is used to adapt to the working conditions of special media (such as easily solidifying media), and allows hot media such as steam to be introduced into the insulation jacket and circulated to maintain the valve body temperature. The remaining structures and components are as described in Embodiment 1, and will not be described again.

[0033] Implementation method 3: such as Figures 2 to 4 As shown, the valve body 1 of this four-bar eccentric butterfly valve with a balance valve has valve stem sleeves 11 on both sides for supporting the valve stem 4. One valve stem sleeve 11 has a valve stem bracket 12, and the other valve stem sleeve 11 has a bearing 7. A stuffing box assembly 13 is provided inside both valve stem sleeves 11 to achieve a dynamic seal between the valve stem 4 and the valve stem sleeve 11. The stuffing box assembly 13 is used to self-adaptively tighten and seal the dynamic gap between itself and the valve stem sleeve 11 when the valve stem 4 rotates. The valve stem bracket 12 is fixed to the outer end of the valve stem sleeve 11, and a gearbox and a driver 8 for driving the valve stem 4 to rotate are mounted on the valve stem bracket 12. One end of the valve stem 4 is connected to the gearbox and the driver 8. The driver can be a pneumatic or electric drive device. The driver controls the rotation of the valve stem 4 via the gearbox, thereby controlling the opening of the butterfly plate 3. The other end of the valve stem 4 is mounted on the bearing 7. The remaining structures and components are as described in Embodiment 1 and will not be repeated.

[0034] During operation: In the initial state, the butterfly plate 3 is in the closed position, tightly fitted to the valve seat 2. The upstream main channel is under high pressure, while the downstream pressure is lower. Before starting the main valve, the balancing valve 53 in the pressure balancing mechanism 5 is opened manually or automatically. At this time, the high-pressure medium from the upstream flows into the balancing pipeline 52 through the balancing hole 51 on the upstream side, passes through the opened balancing valve 53, and then replenishes the downstream main channel through the balancing hole 51 on the downstream side. In this way, the pressure difference between the front and rear sides of the butterfly plate 3 is rapidly reduced to near zero in a short time, basically achieving pressure balance. After pressure balance, the operator starts the actuator mounted on the valve stem bracket 12. The torque output by the actuator is transmitted to the valve stem 4 through the gearbox. The valve stem 4 rotates under the stable support of the valve stem sleeves 11 on both sides and the bearings 7, and is kept sealed by the stuffing box assembly 13. The rotation of the valve stem 4 drives the linkage mechanism 41, causing the butterfly plate 3 to produce a compound motion of first translating and then rotating to open, smoothly leaving the valve seat 2 and opening the main channel. After the butterfly plate 3 is fully opened, the balancing valve 53 is closed to cut off the bypass, and the valve enters the normal flow state.

[0035] This four-link eccentric butterfly valve with a balancing valve achieves easy opening and closing under conditions of large pressure differentials in the pipeline by incorporating a pressure balancing system between the butterfly plate and the valve seat. This effectively protects the butterfly plate and valve seat, ensures a good seal, and extends service life. Specifically:

[0036] (1) It greatly reduces the opening and closing torque of the valve, enabling the valve to operate easily under a pressure difference of up to 6 bar, thus broadening the application range of the butterfly valve.

[0037] (2) Since the butterfly plate operates in a state of almost no pressure difference, it avoids the scouring and physical impact of high pressure fluid on the sealing surface, which significantly improves the reliability of the seal and the overall service life of the valve.

[0038] (3) The reduction in operating torque allows for the selection of smaller drive units, saving costs and installation space.

[0039] The above description illustrates the main features, basic principles, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments or examples described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the above embodiments or examples should be considered exemplary and not restrictive. The scope of this utility model is defined by the appended claims rather than the foregoing description, and therefore all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0040] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A four-bar eccentric butterfly valve with a balancing valve, comprising a valve body (1) with an inner cavity forming a main flow channel, a valve seat (2) disposed on the outlet side of the valve body (1), a butterfly plate (3) disposed within the valve body (1) for sealing the valve seat (2), a valve stem (4) for driving the butterfly plate (3), and a linkage mechanism (41) for connecting the butterfly plate (3) and the valve stem (4), characterized in that: The valve body (1) is provided with a pressure balancing mechanism (5) for balancing the pressure difference before and after the butterfly plate (3). The pressure balancing mechanism (5) includes two balancing holes (51) and a balancing pipe (52). The balance hole (51) is opened on the pipe wall of the valve body (1), and the two balance holes (51) are respectively connected to the upstream side and the downstream side of the main channel located on both sides of the valve seat (2) inside the valve body (1); The two ends of the balancing pipe (52) are connected to and communicate with the two balancing holes (51) respectively, and the balancing pipe (52) is provided with a balancing valve (53) for controlling the opening and closing of the balancing pipe (52).

2. The four-link eccentric butterfly valve with a balance valve according to claim 1, characterized in that: The balancing valve (53) is a balancing shut-off valve.

3. The four-link eccentric butterfly valve with a balance valve according to claim 2, characterized in that: The valve body (1) is provided with a heat insulation jacket (6) on the outside, and a heat insulation layer (601) for steam and the like is formed between the outer wall of the valve body (1) and the inner wall of the heat insulation jacket (6). The heat insulation jacket (6) is provided with a heat medium inlet (61) and a heat medium outlet (62).

4. The four-link eccentric butterfly valve with a balance valve according to claim 3, characterized in that: The valve body (1) has valve stem sleeves (11) on both sides for supporting the valve stem (4). One valve stem sleeve (11) has a valve stem bracket (12) and the other valve stem sleeve (11) has a bearing (7). The two valve stem sleeves (11) are equipped with a stuffing box assembly (13) for achieving dynamic sealing between the valve stem (4) and the valve stem sleeve (11).

5. The four-link eccentric butterfly valve with a balance valve according to claim 4, characterized in that: The valve stem bracket (12) is fixed to the outer end of the valve stem sleeve (11), and a gearbox and driver (8) for driving the valve stem (4) to rotate are installed on the valve stem bracket (12).

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