Three-eccentric metal hard-on-hard sealing butterfly valve

Abstract

This utility model belongs to the field of butterfly valves, specifically a triple-eccentric metal hard-to-hard seal butterfly valve, including a valve body, a valve seat fixed to the inner wall of the valve body; a valve cover provided on the valve seat; a valve stem that is rotatably connected through the valve body; a valve plate connected to the surface of the valve stem inside the valve body via a flat key; a flat keyway provided on the surface of the valve stem outside the valve body; by setting the sealing surface of the valve plate as an inclined disc structure, the friction between the valve plate and the valve seat can be reduced to the greatest extent, thereby achieving metal-to-metal sealing of the device, reducing friction between metals, and reducing the torque required for valve stem rotation. It can also be used to transport media such as liquids, gases, steam, pulp, powders, and particles. Finally, through the cooperation of the abutment plate and the baffle, the rotation angle of the valve plate can be forcibly limited to prevent over-rotation.

Description

Technical Field

[0001] This utility model relates to the field of butterfly valves, specifically a triple-eccentric metal hard-on-hard sealing butterfly valve. Background Technology

[0002] The triple-eccentric metal hard-seal butterfly valve is a high-performance butterfly valve widely used in high-temperature, high-pressure, and harsh operating conditions. Its core feature is that the three eccentric designs achieve a hard-seal contact between the valve plate and the valve seat, thereby achieving zero leakage when closed and reducing frictional wear during opening and closing.

[0003] The three-eccentric structure mainly consists of: axial eccentricity: the valve stem axis deviates from the center line of the valve seat sealing surface to reduce opening and closing friction; radial eccentricity: the valve stem axis deviates from the center line of the pipeline to form a cam effect and achieve progressive contact of the valve plate; and angular eccentricity: the valve seat sealing surface forms a certain angle with the pipeline axis, usually 5°-10°, so that the valve plate becomes tighter and tighter when closed.

[0004] In the prior art, such butterfly valves are prone to problems when in use due to the lack of limit measures. If the manual operation mechanism is not properly operated, the valve plate may rotate beyond the design position, that is, continue to rotate after closing, resulting in additional stress or misalignment on the sealing surface.

[0005] Therefore, a triple-eccentric metal hard-on-hard sealing butterfly valve is proposed to address the above problems. Utility Model Content

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by this utility model to solve its technical problem is as follows: A triple-eccentric metal hard-to-hard seal butterfly valve of this utility model includes a valve body, a valve seat fixedly connected to the inner wall of the valve body; a valve cover provided on the valve seat; a valve stem rotatably connected through and connected to the valve body; a valve plate connected to the surface of the valve stem located inside the valve body via a flat key; a flat keyway opened on the surface of the valve stem located outside the valve body; a stop plate fixedly connected to one side of the valve plate; the side of the valve plate away from the stop plate is inclined; a baffle fixedly connected to the inner wall of the valve body, and the stop plate and the baffle are correspondingly arranged; by setting the sealing surface of the valve plate as an inclined disc structure, the friction between the valve plate and the valve seat can be reduced to the greatest extent, thereby realizing metal-to-metal sealing of the device, reducing friction between metals, and reducing the torque required for valve stem rotation. It can also be used to transport media such as liquids, gases, steam, pulp, powders, and particles. Finally, through the cooperation of the stop plate and the baffle, the rotation angle of the valve plate can be forcibly limited to prevent over-rotation.

[0008] Preferably, the outer wall of the valve stem is provided with a packing bottom ring and a packing pressure ring from bottom to top; the packing bottom ring is fixedly installed inside the valve body; the packing pressure ring and the top of the valve body are connected by bolts; the space between the packing bottom ring and the packing pressure ring is filled with packing, and by adjusting the tightness of the bolts, it can be ensured that the packing pressure ring provides continuous compression force to the packing, ensuring a durable seal of the valve stem at the packing.

[0009] Preferably, the valve plate has a groove on the side away from the abutment plate; by setting the groove, the groove can divide the sealing surface into multiple contact surfaces, so that the medium pressure is transmitted to the valve plate more evenly, and the uniformity of the load distribution on the valve plate sealing surface is improved.

[0010] Preferably, the valve cover surface and the inner wall of the valve body are provided with multiple mounting holes; by providing mounting holes, the valve cover and the valve body are bolted together through the mounting holes, which is a detachable design, allowing valve covers and valve seats of the same specifications to be replaced at will, improving the convenience of valve cover and valve seat maintenance.

[0011] Preferably, a sealing strip is provided between the valve seat and the valve cover; by providing the sealing strip, an additional seal can be provided between the valve seat and the valve cover, reducing the medium seeping between the valve seat and the valve cover.

[0012] Preferably, the edge of the groove is arc-shaped; by setting the edge of the groove to be arc-shaped, stress concentration at the edge of the groove can be reduced.

[0013] The advantages of this utility model are:

[0014] 1. The triple-eccentric metal hard-to-hard sealing butterfly valve of this utility model, by setting the valve plate sealing surface as an inclined disc structure, can minimize the friction between the valve plate and the valve seat, thereby achieving metal-to-metal sealing of the device, reducing friction between metals, and reducing the torque required for valve stem rotation. It can also be used to transport media such as liquids, gases, steam, pulp, powders, and particles. Finally, through the cooperation of the abutment plate and the baffle, the rotation angle of the valve plate can be forcibly limited to prevent over-rotation.

[0015] 2. The triple eccentric metal hard-to-hard seal butterfly valve of this utility model has packing between the packing bottom ring and the packing pressure ring. At the same time, by adjusting the tightness of the bolts, it can be ensured that the packing pressure ring provides continuous compression force to the packing, thus ensuring the long-lasting seal of the valve stem at the packing. Attached Figure Description

[0016] 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, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the main body of this utility model;

[0018] Figure 2 This is a schematic diagram of the valve body in this utility model;

[0019] Figure 3 This is a schematic diagram of the valve stem structure in this utility model;

[0020] Figure 4 This is a schematic diagram of the valve plate in this utility model;

[0021] Figure 5 This is a schematic diagram of the valve cover structure in this utility model;

[0022] Figure 6 This is a schematic diagram of the valve plate in this utility model.

[0023] In the diagram: 1. Valve body; 12. Valve stem; 13. Valve plate; 14. Abutment plate; 15. Baffle plate; 17. Valve seat; 18. Valve cover; 2. Packing bottom ring; 22. Packing pressure ring; 3. Groove; 4. Mounting hole; 5. Sealing strip. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0025] Specific implementation examples are given below.

[0026] Please see Figures 1 to 6As shown in the embodiment of this utility model, a triple-eccentric metal hard-on-hard-seal butterfly valve includes a valve body 1, a valve seat 17 fixedly connected to the inner wall of the valve body 1, a valve cover 18 provided on the valve seat 17, a valve stem 12 rotatably connected through the valve body 1, a valve plate 13 connected to the surface of the valve stem 12 located inside the valve body 1 via a flat key, a flat keyway formed on the surface of the valve stem 12 located outside the valve body 1, a stop plate 14 fixedly connected to one side of the valve plate 13, and a valve plate 13 located away from the stop plate. One side of valve 14 is inclined; a baffle 15 is fixed to the inner wall of valve body 1, and the abutment 14 and the baffle 15 are correspondingly arranged; during operation, the top of valve stem 12 is connected to the output end of worm gear reducer via a flat key, and the valve stem 12 can be rotated by turning the handwheel. When the valve stem 12 rotates, it can drive the valve plate 13 to rotate via the flat key. Since the sealing profile of valve plate 13 is an inclined disc, when the valve stem 12 drives the valve plate 13 to close, the valve plate 13 can be directly pressed onto the valve seat 17, which is different from the traditional The interference seal is converted to a torque seal, minimizing friction between the valve plate 13 and the valve seat 17 and reducing the torque required for the valve stem 12 to rotate. Furthermore, the valve stem 12 can be adjusted at different angles via a handwheel, allowing the valve plate 13 to function as both a shut-off valve and a regulating valve. When the valve plate 13 is used as a shut-off valve, it can move the abutment plate 14 towards the baffle 15, with the abutment plate 14 abutting against the baffle 15 to limit the valve plate 13 and prevent over-rotation of the valve stem 12. By setting the sealing surface of the valve plate 13 as a slanted disc structure, friction between the valve plate 13 and the valve seat 17 is minimized, achieving a metal-to-metal seal and reducing friction between metals. This also reduces the torque required for the valve stem 12 to rotate, making it suitable for conveying liquids, gases, steam, pulp, powders, granules, and other media. Finally, the combined action of the abutment plate 14 and the baffle 15 forces the rotation angle of the valve plate 13 to be limited, preventing over-rotation.

[0027] Please see Figure 3 and Figure 4 As shown, the outer wall of the valve stem 12 is provided with a packing bottom ring 2 and a packing pressure ring 22 from bottom to top; the packing bottom ring 2 is fixedly installed inside the valve body 1; the packing pressure ring 22 and the top of the valve body 1 are connected by bolts; the space between the packing bottom ring 2 and the packing pressure ring 22 is filled with packing, and by adjusting the tightness of the bolts, it can be ensured that the packing pressure ring 22 provides continuous compression force to the packing, ensuring the long-term sealing of the valve stem 12 at the packing.

[0028] Please see Figure 4 As shown, a groove 3 is provided on the side of the valve plate 13 away from the abutment plate 14; by providing the groove 3, the sealing surface can be divided into multiple contact surfaces, so that the medium pressure is transmitted to the valve plate 13 more evenly, and the uniformity of the load distribution on the sealing surface of the valve plate 13 is improved.

[0029] Please see Figure 5 As shown, multiple mounting holes 4 are provided on the surface of the valve cover 18 and the inner wall of the valve body 1. By providing mounting holes 4, the valve cover 18 and the valve body 1 are bolted together through the mounting holes 4, which is a detachable design. Valve covers 18 and valve seats 17 of the same specifications can be replaced at will, improving the convenience of maintenance of valve covers 18 and valve seats 17.

[0030] Please see Figure 5 As shown, a sealing strip 5 is provided between the valve seat 17 and the valve cover 18; by providing the sealing strip 5, the sealing strip 5 can provide an additional seal between the valve seat 17 and the valve cover 18, reducing the medium that seeps into the valve seat 17 and the valve cover 18.

[0031] Please see Figure 4 As shown, the edge of the groove 3 is arc-shaped; by setting the edge of the groove 3 to be arc-shaped, the stress concentration at the edge of the groove 3 can be reduced.

[0032] Working principle: The top of the valve stem 12 is connected to the output end of the worm gear reducer via a flat key. Rotating the handwheel controls the rotation of the valve stem 12. When the valve stem 12 rotates, it drives the valve plate 13 to rotate via the flat key. Since the sealing profile of the valve plate 13 is a slanted disc, when the valve stem 12 drives the valve plate 13 to close, the valve plate 13 can directly press against the valve seat 17, changing from a traditional interference seal to a torque seal. This minimizes friction between the valve plate 13 and the valve seat 17, reducing the torque required for the valve stem 12 to rotate. Furthermore, the valve stem 12 can be adjusted at different angles via the handwheel, allowing the valve plate 13 to function as both a shut-off valve and a regulating valve. When the valve plate 13 is used as a shut-off valve, it can bring the abutment plate 14 closer to the baffle plate 15, causing the abutment plate 14 to abut against the baffle plate 15, thus limiting the valve plate 13 and preventing over-rotation of the valve stem 12. The packing bottom ring 2 and... The packing rings 22 are filled with packing material. By adjusting the tightness of the bolts, the packing rings 22 can provide continuous compression force to the packing, ensuring the long-lasting seal of the valve stem 12 at the packing. The groove 3 divides the sealing surface into multiple contact surfaces, allowing the medium pressure to be transmitted more evenly to the valve plate 13, improving the uniformity of the load distribution on the sealing surface of the valve plate 13. The valve cover 18 and the valve body 1 are bolted together through the mounting holes 4, which is a detachable design. The valve cover 18 and valve seat 17 of the same specifications can be replaced at will, improving the convenience of maintenance of the valve cover 18 and valve seat 17. The sealing strip 5 provides an additional seal between the valve seat 17 and the valve cover 18, reducing the medium seeping between the valve seat 17 and the valve cover 18. By setting the edge of the groove 3 to be arc-shaped, the stress concentration at the edge of the groove 3 can be reduced.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A triple-eccentric metal hard-on-hard-seal butterfly valve, comprising a valve body (1), characterized in that: A valve seat (17) is fixedly connected to the inner wall of the valve body (1); a valve cover (18) is provided on the valve seat (17); a valve stem (12) is rotatably connected through the valve body (1); a valve plate (13) is connected to the surface of the valve stem (12) located inside the valve body (1) by a flat key; a flat key groove is opened on the surface of the valve stem (12) located outside the valve body (1); a stop plate (14) is fixedly connected to one side of the valve plate (13); the side of the valve plate (13) away from the stop plate (14) is inclined; a baffle (15) is fixedly connected to the inner wall of the valve body (1), and the stop plate (14) and the baffle (15) are correspondingly arranged.

2. The triple-eccentric metal hard-on-hard-seal butterfly valve according to claim 1, characterized in that: The outer wall of the valve stem (12) is provided with a packing bottom ring (2) and a packing pressure ring (22) from bottom to top; the packing bottom ring (2) is fixedly installed inside the valve body (1); the packing pressure ring (22) and the top of the valve body (1) are connected by bolts.

3. A triple-eccentric metal hard-on-hard-seal butterfly valve according to claim 2, characterized in that: The valve plate (13) has a groove (3) on the side away from the abutment plate (14).

4. A triple-eccentric metal hard-on-hard-seal butterfly valve according to claim 3, characterized in that: Multiple mounting holes (4) are provided on the surface of the valve cover (18) and the inner wall of the valve body (1).

5. A triple-eccentric metal hard-on-hard-seal butterfly valve according to claim 4, characterized in that: A sealing strip (5) is provided between the valve seat (17) and the valve cover (18).

6. A triple-eccentric metal hard-on-hard-seal butterfly valve according to claim 5, characterized in that: The edge of the groove (3) is arc-shaped.

Images