A composite bidirectional sealing high rigidity butterfly valve

Abstract

The present application relates to the field of valve, especially to a composite bidirectional sealing high rigidity butterfly valve, the butterfly valve is integrated with seven modules of valve seat, valve plate, annular sealing execution module, shape memory alloy driving module, mechanical self-locking module, control module and magnetic rheological fluid anti-looseness module, to build a complete function closed loop of "driving-sealing-locking-anti-looseness". The valve plate is provided with an annular groove and a mounting cavity, which are suitable for mounting of each module; the annular sealing execution module is composed of an annular cylinder body, a flexible front diaphragm and an elastic sealing ring, to realize double bidirectional sealing of dynamic and static state; the shape memory alloy driving module comprises a shape memory alloy element, an independent piston, a common booster cavity and a guide pipe, and has the advantages of compactness, high efficiency and low energy consumption; the mechanical self-locking module (containing a clamping block, an adjusting part and the like) and the magnetic rheological fluid anti-looseness module (containing magnetic rheological fluid and a coil) cooperate to prevent looseness; the control module is controlled through four stages, to effectively solve the pain points of the prior art.

Description

Technical Field

[0001] This invention relates to the field of valves, and in particular to a high-rigidity butterfly valve with a composite bidirectional seal. Background Technology

[0002] Butterfly valves, as a commonly used fluid control device, are widely used in various industrial fields such as petrochemicals, water supply and drainage, power, and metallurgy due to their advantages of simple structure, rapid opening and closing, and low flow resistance. As industrial production moves towards harsher operating conditions such as high pressure, high temperature, strong corrosion, and high vibration, increasingly stringent requirements are being placed on the sealing performance, structural rigidity, operational stability, and service life of butterfly valves.

[0003] Currently, existing butterfly valves generally suffer from insufficient sealing reliability. Traditional butterfly valves mostly use a single sealing structure, such as elastic sealing rings or metal hard seals, which makes it difficult to achieve efficient bidirectional sealing. Under high-pressure conditions, media leakage is prone to occur, especially in bidirectional flow scenarios, where the risk of seal failure increases significantly. Summary of the Invention

[0004] To address the shortcomings mentioned above in the background technology, the present invention provides a high-rigidity butterfly valve with a composite bidirectional sealing.

[0005] The present invention adopts the following technical solution:

[0006] A composite bidirectional sealing high-rigidity butterfly valve, characterized in that it comprises:

[0007] Valve seat;

[0008] A valve plate is disposed inside the valve seat, with a groove on its outer circumference and an installation cavity inside;

[0009] The annular sealing actuator module includes an annular cylinder fixed in the groove, a flexible front diaphragm disposed at the front end of the annular cylinder, and an elastic sealing ring attached to the outer surface of the flexible front diaphragm. The annular cylinder and the flexible front diaphragm form a main hydraulic chamber.

[0010] The shape memory alloy drive module includes multiple shape memory alloy elements arranged uniformly along the circumference within the mounting cavity. The output end of each shape memory alloy element acts on an independent piston. All the independent pistons act together on a common pressurization chamber within the mounting cavity. The common pressurization chamber is connected to the main hydraulic chamber through multiple conduits.

[0011] The mechanical self-locking module includes an inclined structure disposed on an independent piston and a retractable locking block disposed in the mounting cavity. When the independent piston moves to the sealing position, the locking block engages with the back of the inclined structure.

[0012] The control module, located within the mounting cavity, is configured as follows:

[0013] In the first stage, the shape memory alloy drive module is controlled to operate at a first power, pushing the independent piston to compress the common pressurization chamber, thereby pressurizing the main hydraulic chamber, driving the elastic sealing ring to expand and seal, and triggering the mechanical self-locking module to lock.

[0014] During the sealing and holding phase, the shape memory alloy drive module is controlled to stop working;

[0015] During the unlocking preparation phase, the shape memory alloy drive module is controlled to operate at a second power higher than the first power, driving the locked independent piston to produce an overstroke displacement; and

[0016] During the reset phase, the shape memory alloy drive module is controlled to stop working, allowing it to cool and shrink, thereby resetting the independent piston.

[0017] As a further improvement, the mechanical self-locking module also includes a mounting strip disposed in the mounting cavity. The mounting strip has a notch through which the independent piston passes. The mounting strip has a mounting groove. The end of the locking block is disposed in the mounting groove and connected by a spring. The head end of the locking block is located in the notch.

[0018] As a further improvement, the mechanical self-locking module also includes an adjustment part that slides on the outside of the independent piston. The adjustment part has a first inclined surface and a second inclined surface at its upper and lower ends. The inclined surface structure is a conical structure, and its bottom surface has a receiving groove that can accommodate the upper end of the adjustment part. When the independent piston over-stroke displacement occurs, the locking block engages with the back of the adjustment part. During reset, the independent piston is reset under the hydrostatic pressure of the common booster chamber and the main hydraulic chamber. During the process, the locking block first pushes the adjustment part into the receiving groove, and then slides past the adjustment part and the inclined surface structure to disengage from the locked state.

[0019] As a further improvement, the output end of the shape memory alloy element is not connected to the independent piston, but only pushes the independent piston to move.

[0020] As a further improvement, a magnetorheological fluid anti-loosening module is also included, which includes a magnetorheological fluid filled in the mounting groove and a coil for applying a magnetic field thereon. The control module is further configured to energize the coil after the seal is established to solidify the magnetorheological fluid, thereby enhancing the locking state of the mechanical self-locking module.

[0021] As a further improvement, the control module is configured to de-energize the coil before the unlocking preparation phase to restore the magnetorheological fluid to a liquid state.

[0022] As can be seen from the above description of the structure of the present invention, compared with the prior art, the present invention has the following advantages: by integrating seven modules—valve seat, valve plate, annular sealing execution module, shape memory alloy driving module, mechanical self-locking module, control module, and magnetorheological fluid anti-loosening module—a complete functional closed loop of "drive-seal-lock-anti-loosening" is constructed. The valve plate is provided with annular groove and installation cavity to adapt to the installation of each module and improve the structural compactness; the annular sealing execution module is composed of an annular cylinder, a flexible front diaphragm, and an elastic sealing ring, realizing dynamic and static dual bidirectional sealing; the shape memory alloy driving module includes shape memory alloy elements, independent pistons, a common pressurization chamber, and conduits, replacing the traditional driving method and possessing the advantages of compactness, high efficiency, and low energy consumption; the mechanical self-locking module is provided with components such as an installation strip, a retractable locking block, a sloped structure, an adjustment part, and a spring, which work together with the magnetorheological fluid anti-loosening module (including magnetorheological fluid and coil) to form a double guarantee and avoid locking failure; the control module achieves orderly operation of each module through precise control in four stages: seal establishment, seal maintenance, unlocking preparation, and reset. This butterfly valve effectively solves the pain points of existing technologies, such as poor sealing and insufficient stability. Attached Figure Description

[0023] Figure 1 This is a front view structural diagram of the present invention.

[0024] Figure 2 This is a schematic diagram of the cross-sectional structure of the valve plate.

[0025] Figure 3 for Figure 2 An enlarged diagram of A in the diagram.

[0026] Figure 4 This is a schematic diagram of the structure of a partial shape memory alloy drive module.

[0027] Figure 5 This is a cross-sectional schematic diagram of the mechanical self-locking module and the independent piston.

[0028] Figure 6 This is a schematic diagram of the cross-sectional structure of the card block being inserted into the back of the inclined structure.

[0029] Figure 7 This is a cross-sectional view of the locking block inserting into the back of the adjustment section. Detailed Implementation

[0030] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0031] As attached Figure 1 , Figure 2 and Figure 5As shown, a composite bidirectional sealing high-rigidity butterfly valve has a core structure including a valve seat 1, a valve plate 2, an annular sealing actuation module 3, a shape memory alloy drive module 4, a mechanical self-locking module 5, a control module 6, and a magnetorheological fluid anti-loosening module 7. The modules work closely together to form a complete functional closed loop of "drive-seal-lock-anti-loosening".

[0032] As attached Figure 1 and Figure 2 As shown, the valve plate 2, as the core opening and closing component of the butterfly valve, is detachably installed in the inner cavity of the valve seat 1. It achieves precise opening and closing of the flow channel within the valve seat 1 through rotation around its own axis, making it a key component ensuring the valve's on / off performance. To accommodate the subsequent installation of the sealing module and drive module, the outer ring surface of the valve plate 2 is integrally formed with an annular groove 21 along the circumferential direction. The groove 21 has a U-shaped cross-section, and its dimensions are precisely calculated to ensure a perfect match with the installation dimensions of the annular sealing actuator module 3. Simultaneously, the valve plate 2 has radially opened installation cavities 22 with a hollow structure. These cavities 22 adopt a stepped design, reserving independent installation areas for the shape memory alloy drive module 4, the mechanical self-locking module 5, and the control module 6. This ensures that each module is securely installed while avoiding mutual interference during operation, improving the overall compactness and rationality of the structure.

[0033] As attached Figure 2 and Figure 3 As shown, the annular sealing actuator module 3 is the core actuator unit for achieving composite bidirectional sealing of the butterfly valve. It mainly consists of three parts: an annular cylinder 31, a flexible front diaphragm 32, and an elastic sealing ring 33. The entire assembly is integrated into the groove 21 of the valve plate 2, achieving dual protection of dynamic and static sealing during valve opening and closing. The annular cylinder 31 is made of high-strength alloy material (such as 316L stainless steel), possessing excellent pressure resistance and corrosion resistance. Its front end is sealed to the flexible front diaphragm 32, and the two together form a closed annular space, which is the main hydraulic chamber. The chamber is filled with high-purity, low-viscosity incompressible hydraulic oil to ensure timely and uniform pressure transmission. To ensure the sealing reliability of the annular cylinder 31 after installation, its rear end and both sides are welded and fixed using a high-strength argon arc welding process. At the same time, it is equipped with two high-performance metal C-shaped sealing rings for auxiliary sealing. The metal C-shaped sealing rings are made of Monel alloy material that is resistant to high and low temperatures. Through pre-compression, they generate elastic deformation and tightly fit the contact surface between the annular cylinder 31 and the groove 21. This can effectively prevent hydraulic oil leakage and external medium intrusion, achieve a permanent static sealing effect, and ensure that the valve has no risk of sealing failure under long-term static or high-pressure conditions.

[0034] The flexible front diaphragm 32, as a key component for pressure transmission and sealing deformation, offers two optional structures: a multi-layer stainless steel bellows or a high-strength rubber-metal composite diaphragm, to suit different operating conditions. The multi-layer stainless steel bellows is made of 304 stainless steel sheets through precision rolling and welding, typically consisting of 3-5 layers. It possesses extremely strong pressure resistance, capable of withstanding hydraulic pressures up to 50MPa, and can generate precise radial displacement under pressure, with displacement errors controlled within ±0.1mm. The high-strength rubber-metal composite diaphragm uses nitrile rubber or fluororubber as the elastic matrix, with multiple layers of stainless steel wire mesh reinforcement embedded in the middle. It combines the elastic deformation capability of rubber with the structural strength of metal, making it suitable for medium and low pressure conditions and corrosive media environments. The elastic sealing ring 33 is made of high-performance elastomer materials such as fluororubber and polytetrafluoroethylene. It is tightly attached to the outer surface of the flexible front diaphragm 32 through a vulcanization bonding process. Its outer surface is precision ground to form a smooth sealing working surface. The sealing working surface adopts an arc-shaped design, which can form a line contact seal with the inner wall of the valve seat 1 when it expands radially. As the pressure increases, the contact line gradually expands into a contact surface, further improving the sealing effect and realizing a bidirectional sealing function, effectively preventing the medium from leaking from both sides of the valve.

[0035] As attached Figures 2 to 4As shown, the shape memory alloy drive module 4 provides a power source for the annular sealing actuator module 3. It utilizes the thermal drive characteristics of shape memory alloy material to achieve precise power output. Compared to traditional hydraulic and pneumatic drive methods, it has advantages such as compact structure, rapid response, and low energy consumption. This module mainly includes multiple shape memory alloy elements 45, multiple independent pistons 44, a common pressurization chamber 41, and multiple conduits 42. The multiple shape memory alloy elements 45 are evenly arranged along the circumference of the mounting cavity 22, typically numbering 4-6, to ensure the symmetry and uniformity of the power output. The shape memory alloy element 45 is made of Ni-Ti shape memory alloy and undergoes a special heat treatment process, with its phase transformation temperature set at 60-80℃. When the temperature reaches the phase transformation temperature, the element will transform from martensitic phase to austenitic phase, producing a fixed recovery deformation, and thus outputting axial driving force. The output end of each shape memory alloy element 45 is not directly connected to the independent piston 44, but only pushes the independent piston 44 to move axially through end face contact. This design can avoid the reverse pulling force of the independent piston 44 when the element is reset, thus extending the service life of the shape memory alloy element 45. To ensure that the shape memory alloy element 45 does not shift or detach from the independent piston 44 during the heating process, a boss 441 can be formed by protruding outward from the root of the independent piston 44. The core function of the boss 441 is to increase the contact and pushing area between the shape memory alloy element 45 and the independent piston 44. Even if the shape memory alloy element 45 is slightly tilted due to installation errors or working vibrations, the expanded contact area can ensure that the driving force of the element is stably transmitted to the independent piston 44 without affecting the pushing effect. At the same time, an inwardly recessed relief groove can be provided on the end face of the boss 441 facing the shape memory alloy element 45. The relief groove adopts a shallow groove structure that is adapted to the end of the element. It can provide a certain amount of accommodation space for the end of the shape memory alloy element 45, avoiding rigid collision between the end and the edge of the boss 441 when the element is tilted. It can also form a preliminary circumferential limit on the element through the groove wall, further reducing the risk of detachment.

[0036] Multiple independent pistons 44 are fitted onto guide rails within the mounting cavity 22, allowing for smooth axial sliding. The output ends of all independent pistons 44 act together on a common pressure chamber 41. This common pressure chamber 41 has an annular structure with a polished inner wall to reduce hydraulic oil flow resistance. It is connected to the main hydraulic chamber via 4-6 evenly distributed conduits 42. The conduits 42 are made of stainless steel with smooth inner walls to ensure smooth hydraulic oil flow between the two chambers. When the shape memory alloy element 45 is electrically heated to its phase change temperature, it generates an axial driving force that moves the independent pistons 44. The axial thrust of the independent pistons 44 acts on the hydraulic oil in the common pressure chamber 41, converting the axial driving force into hydraulic pressure. The hydraulic oil is then transmitted to the main hydraulic chamber through the conduits 42. The increased pressure in the main hydraulic chamber pushes the flexible front diaphragm 32 to expand radially, thereby causing the elastic sealing ring 33 to fit tightly against the inner wall of the valve seat 1, achieving a seal. To prevent the heat generated by the shape memory alloy element 45 during operation from being transferred to the hydraulic oil and elastic seal ring 33, which could lead to changes in hydraulic oil viscosity and aging and failure of the elastic seal ring 33, this module is specially designed with a thermal management system: a high-temperature resistant insulating layer is wrapped around the outside of the shape memory alloy element 45. The insulating layer is made of ceramic fiber and has excellent heat insulation and insulation properties. At the same time, multiple heat dissipation channels are set in the mounting cavity 22. The heat dissipation channels are connected to the outer wall of the valve plate 2 to dissipate heat and control the hydraulic oil temperature below 40°C, ensuring stable operation of all components.

[0037] As attached Figures 5 to 7As shown, the mechanical self-locking module 5 is used to lock the position of the independent piston 44 after the seal is established, preventing it from moving backward under hydraulic pressure or external vibration, and ensuring the stability of the seal. This module mainly includes components such as a mounting strip 51, a retractable locking block 52, an inclined structure 53, an adjustment part 54, and a spring 56. The mounting strip 51 is made of high-strength aluminum alloy and is fixed in the mounting cavity 22 by bolts. It has a through notch 511 for the independent piston 44 to pass through and slide axially. The mounting strip 51 has a mounting groove 512 perpendicular to the notch 511. The mounting groove 512 is a rectangular cavity. The end of the locking block 52 is embedded in the mounting groove 512 and is connected to the inner wall of the mounting groove 512 by the spring 56. The spring 56 is a stainless steel compression spring with stable elastic recovery performance. In its natural state, the spring 56 is in a pre-compressed state, pushing the first end of the locking block 52 out into the notch 511, preparing for subsequent locking. The first end face of the locking block 52 is inclined to form a first guide slope 521. This slope is adapted to the slope structure 53 on the independent piston 44. When the independent piston 44 moves forward, the slope structure 53 can push the locking block 52 back into the mounting groove 512 by pressing the first guide slope 521. After the locking block 52 moves to the back of the slope structure 53, the spring 56 pushes the locking block 52 to reset, realizing the locking. The design of the first guide slope 521 greatly reduces the frictional resistance between the locking block 52 and the slope structure 53, ensuring a smooth locking process.

[0038] The inclined structure 53 is a conical structure integrally formed on the independent piston 44. Its cone angle is optimized to 30-45°, which facilitates the retraction of the locking block 52 and ensures stability after locking. The bottom surface of the inclined structure 53 has a receiving groove 531, the size of which is adapted to the upper end of the adjusting part 54, providing space for the adjusting part 54 to be inserted. The adjusting part 54 is an annular structure that fits on the outside of the independent piston 44 and can slide axially. Its upper and lower ends are respectively machined with a first inclined surface 541 and a second inclined surface 542. Both inclined surfaces are designed with a small angle of 15-20° to serve as guides. When the shape memory alloy drive module 4 drives the locked independent piston 44 to produce an overstroke displacement, the locking block 52 is engaged with the back of the adjusting part 54 under the action of the spring 56. When the valve needs to be unlocked and reset, the independent piston 44 moves in the opposite direction under the hydraulic pressure of the common booster chamber 41 and the main hydraulic chamber. During the movement, the locking block 52 first contacts the second inclined surface 542 of the adjusting part 54, pushing the adjusting part 54 to move axially. Its upper end and the first inclined surface 541 are embedded in the receiving groove 531. Then the locking block 52 slides along the conical surface of the adjusting part 54 and the inclined surface structure 53, gradually disengaging from the locked state. The entire unlocking process is smooth and orderly, without any jamming.

[0039] As attached Figure 5As shown, to further improve the locking reliability of the mechanical self-locking module 5, this butterfly valve also includes a magnetorheological fluid anti-loosening module 7. This module works in conjunction with the mechanical self-locking module 5 to form a dual guarantee of "mechanical locking + magnetorheological fluid anti-loosening". The magnetorheological fluid anti-loosening module 7 mainly includes magnetorheological fluid 71 and coil 72. The magnetorheological fluid 71 is filled in the mounting groove 512 of the mechanical self-locking module 5, wrapping the end of the locking block 52 and the spring 56. The magnetorheological fluid 71 is composed of a base fluid, magnetic particles and additives. It is liquid in the absence of a magnetic field and has good fluidity, which does not affect the extension and retraction of the locking block 52. The coil 72 is made of copper core enameled wire and is wound around the outside of the mounting groove 512. It is connected to the control module 6 through a high-frequency shielded cable. The high-frequency shielded cable can effectively resist external electromagnetic interference and ensure the stable transmission of control signals. After the seal is established, the control module 6 is configured to output a stable DC current to the coil 72. When the coil 72 is energized, it generates a uniform magnetic field. Under the action of the magnetic field, the magnetic particles in the magnetorheological fluid 71 align along the direction of the magnetic field, forming a chain-like structure, which causes the magnetorheological fluid 71 to change from a liquid state to a solid state. The solid magnetorheological fluid 71 can effectively limit the extension and retraction of the locking block 52 and enhance the locking stability between the locking block 52 and the inclined structure 53. Even under harsh working conditions such as strong vibration and high voltage fluctuation, it can avoid locking failure. When unlocking is required, the control module 6 first controls the coil 72 to be de-energized before the unlocking preparation stage. The magnetic field disappears, the magnetorheological fluid 71 returns to a liquid state, and the restriction on the locking block 52 is released, ensuring that the unlocking process proceeds smoothly.

[0040] As attached Figure 2 , Figure 4 and Figure 5As shown, the control module 6, which serves as the "brain" of the entire butterfly valve, uses a PLC controller as its core and integrates components such as a power module, signal acquisition module, and drive module. The entire module is encapsulated in a waterproof and moisture-proof shell within the installation cavity 22, giving it excellent environmental adaptability. This module achieves precise control of the shape memory alloy driving module 4 and the magnetorheological fluid anti-loosening module 7 through preset control logic. Its operation is divided into four stages: The first stage is the seal establishment stage. The control module 6 outputs a control signal to control the shape memory alloy driving module 4 to operate at the first power. The shape memory alloy element 45 is energized and heated to the phase change temperature, pushing the independent piston 44 to compress the common pressure chamber 41. The pressure in the main hydraulic chamber gradually increases, driving the elastic sealing ring 33 to expand radially and fit against the inner wall of the valve seat 1, achieving a seal. When the independent piston 44 moves to the preset sealing position, the mechanical self-locking module 5 triggers locking, completing the seal establishment. The second stage is the seal holding stage. After the seal is established, the control module 6 controls the shape memory alloy driving module 4 to stop working, the shape memory alloy element 45 cools and resets, and outputs a stable DC current to the coil 72 of the magnetorheological fluid anti-loosening module 7, causing the magnetorheological fluid 71 to... The transition from liquid to solid effectively restricts the expansion and contraction of the locking block 52, ensuring that the mechanical self-locking module 5 remains stably locked. Only a small amount of energy is needed to maintain the seal, significantly reducing operating costs. The third stage is the unlocking preparation stage. The control module 6 first de-energizes the coil 72 of the magnetorheological fluid anti-loosening module 7, restoring the magnetorheological fluid 71 to a liquid state. Then, it controls the shape memory alloy drive module 4 to operate at a second power higher than the first power. The shape memory alloy element 45 generates a greater driving force, driving the locked independent piston 44 to over-stroke displacement, preparing for unlocking. The fourth stage is the reset stage. The control module 6 stops the shape memory alloy drive module 4, the shape memory alloy element 45 gradually cools and contracts, and the independent piston 44 resets in the reverse direction under the hydraulic pressure of the common pressurization chamber 41 and the main hydraulic chamber. The mechanical self-locking module 5 unlocks, the elastic sealing ring 33 contracts, and the valve returns to the open state.

[0041] The butterfly valve of this invention integrates seven modules: valve seat 1, valve plate 2, annular sealing execution module 3, shape memory alloy driving module 4, mechanical self-locking module 5, control module 6, and magnetorheological fluid anti-loosening module 7, to construct a complete functional closed loop of "drive-seal-lock-anti-loosening". The valve plate 2 is equipped with an annular groove 21 and an installation cavity 22 to accommodate the installation of various modules and improve the structural compactness. The annular sealing actuator module 3 consists of an annular cylinder 31, a flexible front diaphragm 32, and an elastic sealing ring 33, achieving dynamic and static dual bidirectional sealing. The shape memory alloy drive module 4 includes a shape memory alloy element 45, an independent piston 44, a common pressurization chamber 41, and a conduit 42, replacing the traditional drive method and possessing the advantages of compactness, high efficiency, and low energy consumption. The mechanical self-locking module 5 is equipped with components such as an installation strip 51, a retractable locking block 52, an inclined structure 53, an adjustment part 54, and a spring 56, which work in conjunction with the magnetorheological fluid anti-loosening module 7 (including magnetorheological fluid 71 and coil 72) to form a dual guarantee and prevent locking failure. The control module 6 achieves orderly operation of each module through precise control in four stages: seal establishment, seal maintenance, unlocking preparation, and reset. This butterfly valve effectively solves the pain points of poor sealing and insufficient stability in existing technologies.

[0042] The above are merely specific embodiments of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept shall be considered as infringing upon the protection scope of the present invention.

Claims

1. A composite bidirectional sealing high-rigidity butterfly valve, characterized in that, Including: Valve seat; A valve plate is disposed inside the valve seat, with a groove on its outer circumference and an installation cavity inside; The annular sealing actuator module includes an annular cylinder fixed in the groove, a flexible front diaphragm disposed at the front end of the annular cylinder, and an elastic sealing ring attached to the outer surface of the flexible front diaphragm. The annular cylinder and the flexible front diaphragm form a main hydraulic chamber. The shape memory alloy drive module includes multiple shape memory alloy elements arranged uniformly along the circumference within the mounting cavity. The output end of each shape memory alloy element acts on an independent piston. All the independent pistons act together on a common pressurization chamber within the mounting cavity. The common pressurization chamber is connected to the main hydraulic chamber through multiple conduits. The mechanical self-locking module includes an inclined structure on an independent piston, a retractable locking block in the mounting cavity, and a mounting strip in the mounting cavity. When the independent piston moves to the sealing position, the locking block engages with the back of the inclined structure. The mounting strip has a notch through which the independent piston passes. The mounting strip has a mounting groove. The end of the locking block is located in the mounting groove and connected by a spring. The head of the locking block is located in the notch. A magnetorheological fluid anti-loosening module includes a magnetorheological fluid filled in the mounting groove and a coil for applying a magnetic field thereon; The control module, located within the mounting cavity, is configured as follows: In the first stage, the shape memory alloy drive module is controlled to operate at a first power, pushing the independent piston to compress the common pressurization chamber, thereby pressurizing the main hydraulic chamber, driving the elastic sealing ring to expand and seal, and triggering the mechanical self-locking module to lock. After the seal is established, the coil is energized to solidify the magnetorheological fluid, thereby enhancing the locking state of the mechanical self-locking module; During the sealing and holding phase, the shape memory alloy drive module is controlled to stop working; Before the unlocking preparation phase, the coil is de-energized to restore the magnetorheological fluid to a liquid state. During the unlocking preparation phase, the shape memory alloy drive module is controlled to operate at a second power higher than the first power, driving the locked independent piston to produce an overstroke displacement. as well as During the reset phase, the shape memory alloy drive module is controlled to stop working, allowing it to cool and shrink, thereby resetting the independent piston.

2. The composite bidirectional sealing high-rigidity butterfly valve as described in claim 1, characterized in that: The mechanical self-locking module also includes an adjustment part that slides outside the independent piston. The adjustment part has a first inclined surface and a second inclined surface at its upper and lower ends. The inclined surface has a conical structure and its bottom surface has a receiving groove that can accommodate the upper end of the adjustment part. When the independent piston over-stroke displacement occurs, the locking block engages with the back of the adjustment part. During reset, the independent piston is reset under the hydrostatic pressure of the common booster chamber and the main hydraulic chamber. During the process, the locking block first pushes the adjustment part into the receiving groove, and then slides past the adjustment part and the inclined surface structure to disengage from the locked state.

3. The composite bidirectional sealing high-rigidity butterfly valve as described in claim 1, characterized in that: The output end of the shape memory alloy element is not connected to the independent piston, but only pushes the independent piston to move.

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