Low torque triple offset butterfly valve

Abstract

The utility model discloses a low torque three eccentric butterfly valve, including valve body, valve rod subassembly, valve plate subassembly and execution subassembly. Valve body is equipped with main valve seat and medium main channel, and valve rod subassembly includes coaxial and independent rotation's main valve rod, vice valve rod, in valve plate subassembly, main valve plate is connected with main valve rod and cooperates main valve seat and seals medium main channel, and its coaxial and has set up vice valve seat's medium vice channel, and vice valve plate is connected with vice valve rod and seals medium vice channel, and two groups of execution mechanism of execution subassembly drive corresponding valve rod respectively. When opening, open vice valve plate first and balance main valve plate both sides medium pressure, then open main valve plate, because vice valve plate area is small, and opening torque is low, after vice valve plate opening, main valve plate opening side medium pressure reduces, therefore, main valve plate opening resistance also reduces greatly, and two groups of execution mechanism can select small torque execution mechanism, and the whole machine cost is effectively reduced, and market competitiveness of large -diameter, high pressure difference working condition is improved.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a low-torque triple eccentric butterfly valve. Background Technology

[0002] Currently, existing triple eccentric butterfly valves are unidirectional seals, i.e., positive seals. When the medium flows forward through the valve body, because the valve stem is not in the center of the valve body, the effective area of ​​the valve plate on both sides of the valve stem is different. The resulting torque is conducive to the valve plate closing. Therefore, triple eccentric butterfly valves are directional and positive seals. When the triple eccentric butterfly valve is used in large-diameter and high pressure differential conditions, the closing torque generated by the medium acting on the valve plate is very large. On the one hand, this is conducive to the butterfly valve sealing, but on the other hand, the butterfly valve needs to overcome the closing torque of the medium acting on the valve plate when opening, causing the opening torque to increase sharply, far exceeding the closing torque. This results in a larger actuator and higher overall cost. Summary of the Invention

[0003] This invention provides a low-torque triple eccentric butterfly valve to solve the problem that existing triple eccentric butterfly valves have a large opening torque under large diameter and high pressure differential conditions, resulting in a large actuator and high overall cost.

[0004] This utility model provides a low-torque triple-eccentric butterfly valve, comprising: The valve body is provided with a main valve seat, and the main valve seat is provided with a main medium channel; A valve stem assembly is rotatably connected to the valve body. The valve stem assembly includes a main valve stem and a secondary valve stem, which are rotatably connected and coaxially arranged. A valve plate assembly is located within the main medium channel. The valve plate assembly includes a main valve plate and a secondary valve plate. The main valve plate is connected to the main valve stem, and the secondary valve plate is connected to the secondary valve stem. A secondary medium channel is coaxially formed on the main valve plate with the main medium channel. A secondary valve seat is provided within the secondary medium channel. The main valve plate is used to cooperate with the main valve seat to seal the main medium channel, and the secondary valve plate is used to cooperate with the secondary valve seat to seal the secondary medium channel. The main valve stem is used to drive the main valve plate to rotate, thereby opening or closing the main medium channel, and the secondary valve stem is used to drive the secondary valve plate to rotate, thereby opening or closing the secondary medium channel. The actuation component includes a first actuator and a second actuator. The first actuator is connected to the main valve stem and is used to drive the main valve stem to rotate. The second actuator is connected to the auxiliary valve stem and is used to drive the auxiliary valve stem to rotate.

[0005] In one embodiment of the present invention, the diameter of the main valve stem is larger than that of the auxiliary valve stem, and a groove is provided at one end of the main valve stem located axially within the main medium channel, and the end of the auxiliary valve stem located axially within the main medium channel is rotatably connected to the groove.

[0006] In one embodiment of the present invention, the main valve plate is provided with a first valve stem hub and a second valve stem hub along the axial direction of the valve stem assembly. The main valve stem is pin-connected to the first valve stem hub, the auxiliary valve stem is rotatably connected to the second valve stem hub, and the auxiliary valve stem is pin-connected to the auxiliary valve plate.

[0007] In one embodiment of the present invention, the main valve plate is provided with a main sealing ring, a main pressure ring and a main pressure ring bolt. The main sealing ring is disposed on the outer side wall of the main valve plate. The main pressure ring is used to press the main sealing ring. The main pressure ring bolt passes through the main pressure ring and is threadedly connected to the main valve plate. The main pressure ring bolt is used to provide preload force for the main pressure ring to compress the main sealing ring. The secondary valve plate is provided with a secondary sealing ring, a secondary pressure ring, and a secondary pressure ring bolt. The secondary sealing ring is disposed on the outer side wall of the secondary valve plate. The secondary pressure ring is used to press the secondary sealing ring. The secondary pressure ring bolt passes through the secondary pressure ring and is threadedly connected to the secondary valve plate. The secondary pressure ring bolt is used to provide preload force for the secondary pressure ring to compress the secondary sealing ring.

[0008] In one embodiment of the present invention, a first bearing is provided between the main valve stem and the valve body, and a second bearing is provided between the auxiliary valve stem and the valve body.

[0009] In one embodiment of the present invention, a first sealing assembly is provided between the main valve stem and the valve body, and a second sealing assembly is provided between the auxiliary valve stem and the valve body.

[0010] In one embodiment of the present invention, the first sealing assembly includes a first packing sealing component, a first packing gland, a first packing pressure plate, and a first packing bolt. The first packing sealing component is used to seal the gap between the main valve stem and the valve body. The first packing gland abuts against the first packing sealing component. The first packing pressure plate abuts against the first packing gland. The first packing bolt passes through the first packing pressure plate and is threadedly connected to the valve body. The first packing bolt is used to provide preload for the first sealing assembly. The second sealing assembly includes a second packing seal component, a second packing gland, a second packing pressure plate, and a second packing bolt. The second packing seal component is used to seal the gap between the secondary valve stem and the valve body. The second packing gland abuts against the second packing seal component. The second packing pressure plate abuts against the second packing gland. The second packing bolt passes through the second packing pressure plate and is threadedly connected to the valve body. The second packing bolt is used to provide preload for the second sealing assembly.

[0011] In one embodiment of the present invention, the valve body is provided with a first bracket and a second bracket, the first bracket being used to install the first actuator, and the second bracket being used to install the second actuator.

[0012] In one embodiment of the present invention, the main valve stem is provided with a first connecting key, the auxiliary valve stem is provided with a second connecting key, the main valve stem is connected to the first actuator through the first connecting key, and the auxiliary valve stem is connected to the second actuator through the second connecting key.

[0013] In one embodiment of the present invention, the secondary valve plate is located at the center of the main valve plate.

[0014] The beneficial effects of this utility model are as follows: This utility model proposes a low-torque triple-eccentric butterfly valve. The main valve plate and main valve seat cooperate to control the opening and closing of the main medium channel, while the auxiliary valve plate and auxiliary valve seat cooperate to control the opening and closing of the secondary medium channel. The main valve stem and auxiliary valve stem are coaxially arranged and rotate independently, each driven by a corresponding actuator. When the valve is opened, the second actuator first drives the auxiliary valve stem to rotate the auxiliary valve plate, opening the secondary medium channel and balancing the medium pressure on both sides of the main valve plate. Then, the first actuator drives the main valve stem to rotate the main valve plate, opening the main medium channel and enabling medium flow. The valve first drives the auxiliary valve plate to open the secondary medium channel to balance the pressure on both sides of the main valve plate. The pressure on both sides of the main valve plate significantly reduces the pressure difference force of the medium when the main valve plate is opened, thereby effectively reducing the output torque of the first actuator. Furthermore, since the secondary valve plate is set on the main valve plate, and its area is smaller than that of the main valve plate, the medium closing torque that the secondary valve plate needs to overcome to open the secondary medium channel is much smaller than that that the main valve plate needs to overcome. The second actuator only needs to output a lower torque to open the secondary valve plate. Therefore, both the first and second actuators can be configured with low-torque actuators, thereby reducing the selection cost of actuators and the overall equipment cost, and enhancing market competitiveness under large-diameter, high-pressure differential conditions. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0016] In the attached diagram: Figure 1 A cross-sectional structural schematic diagram of a low-torque triple eccentric butterfly valve provided in an embodiment of this utility model; Figure 2 for Figure 1 Enlarged schematic diagram of the structure of section A in the middle; Figure 3 for Figure 1 Enlarged schematic diagram of the structure of section B in the middle; Figure 4 for Figure 1 Enlarged schematic diagram of the C-section structure; Figure 5 for Figure 1 Enlarged schematic diagram of the structure of section D in the middle.

[0017] The attached figures are labeled as follows: Valve body 1, main valve seat 101, main medium passage 102, first bracket 103, second bracket 104, valve stem assembly 2, main valve stem 201, countersunk groove 201a, first connecting key 201b, auxiliary valve stem 202, second connecting key 202a, valve plate assembly 3, main valve plate 301, secondary medium passage 301a, auxiliary valve seat 301b, first valve stem hub 301c, second valve stem hub 301d, main sealing ring 301e, main pressure ring 301f, main pressure ring... 301g ring bolt, 302 secondary valve plate, 302a secondary sealing ring, 302b secondary pressure ring, 302c secondary pressure ring bolt, 4 first bearing, 5 second bearing, 6 first sealing assembly, 601 first packing seal component, 602 first packing gland, 603 first packing pressure plate, 604 first packing bolt, 7 second sealing assembly, 701 second packing seal component, 702 second packing gland, 703 second packing pressure plate, 704 second packing bolt. Detailed Implementation

[0018] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0019] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0020] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0021] Please combine Figures 1 to 5 As shown, this utility model provides a low-torque triple eccentric butterfly valve.

[0022] In one exemplary embodiment of this application, the low-torque triple-eccentric butterfly valve includes: Valve body 1 is provided with a main valve seat 101, and a main medium passage 102 is provided on the main valve seat 101; Valve stem assembly 2 is rotatably connected to valve body 1. Valve stem assembly 2 includes main valve stem 201 and auxiliary valve stem 202. The main valve stem 201 and auxiliary valve stem 202 are rotatably connected and coaxially arranged. Valve plate assembly 3, located within the medium channel, includes a main valve plate 301 and a secondary valve plate 302. The main valve plate 301 is connected to the main valve stem 201, and the secondary valve plate 302 is connected to the secondary valve stem 202. A secondary medium channel 301a is coaxially formed on the main medium channel 102 on the main valve plate 301. A secondary valve seat 301b is provided in the secondary medium channel 301a. The main valve plate 301 is used to cooperate with the main valve seat 101 to seal the main medium channel 102, and the secondary valve plate 302 is used to cooperate with the secondary valve seat 301b to seal the secondary medium channel 301a. The main valve stem 201 is used to drive the main valve plate 301 to rotate, thereby opening or closing the main medium channel 102. The secondary valve stem 202 is used to drive the secondary valve plate 302 to rotate, thereby opening or closing the secondary medium channel 301a. The actuation assembly includes a first actuator and a second actuator. The first actuator is connected to the main valve stem 201 and is used to drive the main valve stem 201 to rotate. The second actuator is connected to the auxiliary valve stem 202 and is used to drive the auxiliary valve stem 202 to rotate.

[0023] In this embodiment, the main valve plate 301 and the main valve seat 101 cooperate to control the opening and closing of the main medium channel 102, and the auxiliary valve plate 302 and the auxiliary valve seat 301b cooperate to control the opening and closing of the secondary medium channel 301a. The main valve stem 201 and the auxiliary valve stem 202 are coaxially arranged and rotate independently, and are driven by corresponding actuators. When the valve is opened, the second actuator first drives the auxiliary valve stem 202 to rotate the auxiliary valve plate 302, opening the secondary medium channel 301a and balancing the medium pressure on both sides of the main valve plate 301. Then, the first actuator drives the main valve stem 201 to rotate the main valve plate 301, opening the main medium channel 102 to realize medium flow. The pressure on both sides of the main valve plate 301 is balanced, which significantly reduces the pressure difference force of the medium when the main valve plate 301 is opened, thereby effectively reducing the output torque of the first actuator. Furthermore, since the secondary valve plate 302 is set on the main valve plate 301, the area of ​​the secondary valve plate 302 is smaller than that of the main valve plate 301. The medium closing torque that the secondary valve plate 302 needs to overcome to open the secondary medium channel 301a is much smaller than that that the main valve plate 301 needs to overcome. The second actuator only needs to output a lower torque to open the secondary valve plate 302. Therefore, both the first and second actuators can be configured with small torque actuators, thereby reducing the selection cost of actuators and the cost of the whole equipment, and improving market competitiveness under large-diameter, high-pressure differential conditions.

[0024] In an exemplary embodiment of this application, the diameter of the main valve stem 201 is larger than that of the auxiliary valve stem 202. One end of the main valve stem 201 located axially within the main medium channel 102 is provided with a settling groove 201a, and one end of the auxiliary valve stem 202 located axially within the main medium channel 102 is rotatably connected to the settling groove 201a.

[0025] In this embodiment, located within the medium channel, the secondary valve stem 202 extends into the recess 201a provided at the end of the main valve stem 201, so that the secondary valve stem 202 and the main valve stem 201 are connected to form a coaxial structure, and the secondary valve stem 202 is radially limited. The secondary valve stem 202 is rotatably connected to the recess 201a, so that the secondary valve stem 202 and the main valve stem 201 can rotate independently of each other.

[0026] In an exemplary embodiment of this application, the main valve plate 301 is provided with a first valve stem hub 301c and a second valve stem hub 301d along the axial direction of the valve stem assembly 2. The main valve stem 201 is pin-connected to the first valve stem hub 301c, the auxiliary valve stem 202 is rotatably connected to the second valve stem hub 301d, and the auxiliary valve stem 202 is pin-connected to the auxiliary valve plate 302.

[0027] In this embodiment, the main valve plate 301 is connected to the valve body 1 via the main valve stem 201 and the auxiliary valve stem 202. Since the main valve stem 201 is pin-connected to the first valve stem hub 301c and the auxiliary valve stem 202 is rotatably connected to the second valve stem hub 301d, the main valve plate 301 is driven by the main valve stem 201, and the auxiliary valve stem 202 only provides radial support to the main valve plate 301 without affecting the rotation of the main valve plate 301. The auxiliary valve plate 302 is pin-connected to the auxiliary valve stem 202, so that the auxiliary valve plate 302 is directly driven by the auxiliary valve stem 202.

[0028] In an exemplary embodiment of this application, the main valve plate 301 is provided with a main sealing ring 301e, a main pressure ring 301f, and a main pressure ring bolt 301g. The main sealing ring 301e is disposed on the outer side wall of the main valve plate 301. The main pressure ring 301f is used to press the main sealing ring 301e. The main pressure ring bolt 301g passes through the main pressure ring 301f and is threadedly connected to the main valve plate 301. The main pressure ring bolt 301g is used to provide preload force for the main pressure ring 301f to compress the main sealing ring 301e. The secondary valve plate 302 is provided with a secondary sealing ring 302a, a secondary pressure ring 302b, and a secondary pressure ring bolt 302c. The secondary sealing ring 302a is located on the outer side wall of the secondary valve plate 302. The secondary pressure ring 302b is used to press the secondary sealing ring 302a. The secondary pressure ring bolt 302c passes through the secondary pressure ring 302b and is threadedly connected to the secondary valve plate 302. The secondary pressure ring bolt 302c is used to provide preload force for the secondary pressure ring 302b to compress the secondary sealing ring 302a.

[0029] In this embodiment, the main sealing ring 301e is used to cooperate with the main valve seat 101 to seal the main medium channel 102, the main pressure ring 301f is used to abut against the main sealing ring 301e, and the main pressure ring bolt 301g is used to apply compressive force to the main pressure ring 301f to press and fix the main sealing ring 301e onto the main valve plate 301; the secondary sealing ring 302a is used to cooperate with the secondary valve seat 301b to seal the secondary medium channel 301a, the secondary pressure ring 302b is used to abut against the secondary sealing ring 302a, and the secondary pressure ring bolt 302c is used to apply compressive force to the secondary pressure ring 302b to press and fix the secondary sealing ring 302a onto the secondary valve plate 302.

[0030] In an exemplary embodiment of this application, a first bearing 4 is provided between the main valve stem 201 and the valve body 1, and a second bearing 5 is provided between the auxiliary valve stem 202 and the valve body 1.

[0031] In this embodiment, the main valve stem 201 is rotatably connected to the valve body 1 via the first bearing 4 to avoid frictional damage between the main valve stem 201 and the valve body 1; the auxiliary valve stem 202 is rotatably connected to the valve body 1 via the second bearing 5 to avoid frictional damage between the auxiliary valve stem 202 and the valve body 1.

[0032] In an exemplary embodiment of this application, a first sealing assembly 6 is provided between the main valve stem 201 and the valve body 1, and a second sealing assembly 7 is provided between the auxiliary valve stem 202 and the valve body 1.

[0033] In this embodiment, the first sealing assembly 6 is used to seal the gap between the main valve stem 201 and the valve body 1 to prevent the medium from leaking out at the gap between the main valve stem 201 and the valve body 1; the second sealing assembly 7 is used to seal the gap between the auxiliary valve stem 202 and the valve body 1 to prevent the medium from leaking out at the gap between the auxiliary valve stem 202 and the valve body 1.

[0034] In an exemplary embodiment of this application, the first sealing assembly 6 includes a first packing seal 601, a first packing gland 602, a first packing pressure plate 603, and a first packing bolt 604. The first packing seal 601 is used to seal the gap between the main valve stem 201 and the valve body 1. The first packing gland 602 abuts against the first packing seal 601. The first packing pressure plate 603 abuts against the first packing gland 602. The first packing bolt 604 passes through the first packing pressure plate 603 and is threadedly connected to the valve body 1. The first packing bolt 604 is used to provide preload force for the first sealing assembly 6. The second sealing assembly 7 includes a second packing seal component 701, a second packing gland 702, a second packing pressure plate 703, and a second packing bolt 704. The second packing seal component 701 is used to seal the gap between the secondary valve stem 202 and the valve body 1. The second packing gland 702 abuts against the second packing seal component 701. The second packing pressure plate 703 abuts against the second packing gland 702. The second packing bolt 704 passes through the second packing pressure plate 703 and is threadedly connected to the valve body 1. The second packing bolt 704 is used to provide preload for the second sealing assembly 7.

[0035] In this embodiment, the first sealing assembly 6 fills the gap between the main valve stem 201 and the valve body 1 through the first packing sealing component 601, and the second sealing assembly 7 fills the gap between the auxiliary valve stem 202 and the valve body 1 through the second packing sealing component 701; the first packing bolt 604 passes through the first packing pressure plate 603 to press the first packing cover 602, and the second packing bolt 704 passes through the second packing pressure plate 703 to press the second packing cover 702. The bolt preload causes the packing sealing component to undergo radial deformation, tightly fitting the mating surface between the valve stem and the valve body 1.

[0036] In an exemplary embodiment of this application, the valve body 1 is provided with a first bracket 103 and a second bracket 104. The first bracket 103 is used to install a first actuator, and the second bracket 104 is used to install a second actuator.

[0037] In this embodiment, the first bracket 103 is located at the protruding end of the main valve stem 201 on the valve body 1 and is used to install the first actuator; the second bracket 104 is located at the protruding end of the auxiliary valve stem 202 on the valve body 1 and is used to install the second actuator.

[0038] In an exemplary embodiment of this application, the main valve stem 201 is provided with a first connecting key 201b, and the secondary valve stem 202 is provided with a second connecting key 202a. The main valve stem 201 is connected to the first actuator through the first connecting key 201b, and the secondary valve stem 202 is connected to the second actuator through the second connecting key 202a.

[0039] In this embodiment, the main valve stem 201 is connected to the output end of the first actuator via the first connecting key 201b, and the auxiliary valve stem 202 is connected to the output end of the second actuator via the second connecting key 202a.

[0040] In one exemplary embodiment of this application, the secondary valve plate 302 is located at the center of the main valve plate 301.

[0041] In this embodiment, when the centrally arranged secondary valve plate 302 is opened, it enables the medium to flow quickly from the central area of ​​the main valve plate 301, evenly balancing the medium pressure distribution on both sides of the main valve plate 301, and avoiding increased opening resistance of the main valve plate 301 due to pressure imbalance.

[0042] Working principle: The main valve plate 301, in cooperation with the main valve seat 101, controls the opening and closing of the main medium channel 102; the auxiliary valve plate 302, in cooperation with the auxiliary valve seat 301b, controls the opening and closing of the secondary medium channel 301a. The main valve stem 201 and the auxiliary valve stem 202 are coaxially arranged and rotate independently, and are driven by corresponding actuators. When the valve is opened, the second actuator first drives the auxiliary valve stem 202 to rotate the auxiliary valve plate 302, opening the secondary medium channel 301a and balancing the medium pressure on both sides of the main valve plate 301. Then, the first actuator drives the main valve stem 201 to rotate the main valve plate 301, opening the main medium channel 102 to achieve medium flow. The process of first driving the auxiliary valve plate 302 to open the secondary medium channel 301a and balance the pressure is achieved. The pressure on both sides of the main valve plate 301 significantly reduces the pressure difference force of the medium when the main valve plate 301 is opened, thereby effectively reducing the output torque of the first actuator. Furthermore, since the secondary valve plate 302 is set on the main valve plate 301, and the area of ​​the secondary valve plate 302 is smaller than that of the main valve plate 301, the medium closing torque that the secondary valve plate 302 needs to overcome to open the secondary medium channel 301a is much smaller than that that the main valve plate 301 needs to overcome. The second actuator only needs to output a lower torque to open the secondary valve plate 302. Therefore, both the first and second actuators can be configured with small torque actuators, thereby reducing the selection cost of actuators and the cost of the entire equipment, and improving market competitiveness under large-diameter, high-pressure differential conditions.

[0043] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A low-torque triple eccentric butterfly valve, characterized in that, include: The valve body is provided with a main valve seat, and the main valve seat is provided with a main medium channel; A valve stem assembly is rotatably connected to the valve body. The valve stem assembly includes a main valve stem and a secondary valve stem, which are rotatably connected and coaxially arranged. A valve plate assembly is located within the main medium channel. The valve plate assembly includes a main valve plate and a secondary valve plate. The main valve plate is connected to the main valve stem, and the secondary valve plate is connected to the secondary valve stem. A secondary medium channel is coaxially formed on the main valve plate with the main medium channel. A secondary valve seat is provided within the secondary medium channel. The main valve plate is used to cooperate with the main valve seat to seal the main medium channel, and the secondary valve plate is used to cooperate with the secondary valve seat to seal the secondary medium channel. The main valve stem is used to drive the main valve plate to rotate, thereby opening or closing the main medium channel, and the secondary valve stem is used to drive the secondary valve plate to rotate, thereby opening or closing the secondary medium channel. The actuation component includes a first actuator and a second actuator. The first actuator is connected to the main valve stem and is used to drive the main valve stem to rotate. The second actuator is connected to the auxiliary valve stem and is used to drive the auxiliary valve stem to rotate.

2. The low-torque triple eccentric butterfly valve according to claim 1, characterized in that: The diameter of the main valve stem is larger than that of the auxiliary valve stem. One end of the main valve stem located axially within the main medium channel is provided with a settling groove, and the other end of the auxiliary valve stem located axially within the main medium channel is rotatably connected to the settling groove.

3. The low-torque triple eccentric butterfly valve according to claim 1, characterized in that: The main valve plate is provided with a first valve stem hub and a second valve stem hub along the axial direction of the valve stem assembly. The main valve stem is pin-connected to the first valve stem hub, the auxiliary valve stem is rotatably connected to the second valve stem hub, and the auxiliary valve stem is pin-connected to the auxiliary valve plate.

4. The low-torque triple eccentric butterfly valve according to claim 1, characterized in that: The main valve plate is provided with a main sealing ring, a main pressure ring and a main pressure ring bolt. The main sealing ring is disposed on the outer side wall of the main valve plate. The main pressure ring is used to press the main sealing ring. The main pressure ring bolt passes through the main pressure ring and is threadedly connected to the main valve plate. The main pressure ring bolt is used to provide preload force for the main pressure ring to compress the main sealing ring. The secondary valve plate is provided with a secondary sealing ring, a secondary pressure ring, and a secondary pressure ring bolt. The secondary sealing ring is disposed on the outer side wall of the secondary valve plate. The secondary pressure ring is used to press the secondary sealing ring. The secondary pressure ring bolt passes through the secondary pressure ring and is threadedly connected to the secondary valve plate. The secondary pressure ring bolt is used to provide preload force for the secondary pressure ring to compress the secondary sealing ring.

5. The low-torque triple eccentric butterfly valve according to claim 2, characterized in that: A first bearing is provided between the main valve stem and the valve body, and a second bearing is provided between the auxiliary valve stem and the valve body.

6. The low-torque triple eccentric butterfly valve according to claim 5, characterized in that: A first sealing assembly is provided between the main valve stem and the valve body, and a second sealing assembly is provided between the auxiliary valve stem and the valve body.

7. The low-torque triple eccentric butterfly valve according to claim 6, characterized in that: The first sealing assembly includes a first packing seal component, a first packing gland, a first packing pressure plate, and a first packing bolt. The first packing seal component is used to seal the gap between the main valve stem and the valve body. The first packing gland abuts against the first packing seal component. The first packing pressure plate abuts against the first packing gland. The first packing bolt passes through the first packing pressure plate and is threadedly connected to the valve body. The first packing bolt is used to provide preload for the first sealing assembly. The second sealing assembly includes a second packing seal component, a second packing gland, a second packing pressure plate, and a second packing bolt. The second packing seal component is used to seal the gap between the secondary valve stem and the valve body. The second packing gland abuts against the second packing seal component. The second packing pressure plate abuts against the second packing gland. The second packing bolt passes through the second packing pressure plate and is threadedly connected to the valve body. The second packing bolt is used to provide preload for the second sealing assembly.

8. The low-torque triple eccentric butterfly valve according to claim 1, characterized in that: The valve body is provided with a first bracket and a second bracket. The first bracket is used to install the first actuator, and the second bracket is used to install the second actuator.

9. The low-torque triple eccentric butterfly valve according to claim 1, characterized in that: The main valve stem is provided with a first connecting key, and the auxiliary valve stem is provided with a second connecting key. The main valve stem is connected to the first actuator through the first connecting key, and the auxiliary valve stem is connected to the second actuator through the second connecting key.

10. The low-torque triple eccentric butterfly valve according to claim 1, characterized in that: The secondary valve plate is located at the center of the main valve plate.

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