Large-caliber bidirectional metal spherical sealing butterfly valve

Abstract

The invention relates to the technical field of butterfly valves, and discloses a large-diameter bidirectional metal spherical sealing butterfly valve which comprises a valve body and a valve core plate arranged in the valve body, and further comprises a sliding table fixed in the valve body; the floating ring is slidably arranged in the sliding table; the limiting ring and the bolt are fixed on the sliding table; the power part is rotationally arranged on the valve body; the liquid sealing piece is fixed on the valve body; the hydraulic part is fixed on the valve body; the first U-shaped adhesive tape is fixed on the floating ring; the second U-shaped adhesive tape is fixed on the floating ring; the O-shaped sealing rubber strip is fixed on the outer wall of the valve core plate; when the power shaft rotates, the piston plate is synchronously driven to swing in the liquid level groove, and hydraulic oil in the groove is injected into the first U-shaped rubber strip and the second U-shaped rubber strip through the hydraulic pipe; by utilizing the incompressible pressure driving characteristic of hydraulic oil, the hydraulic force is uniformly transmitted to each contact surface of the rubber strip, so that the flexible rubber body deforms and is tightly attached to the curved surface contour of the outer wall of the valve core plate.

Description

Technical Field

[0001] The present invention relates to the technical field of butterfly valves, and in particular to a large-caliber bidirectional metal spherical sealing butterfly valve. Background Art

[0002] In modern industry, large-diameter butterfly valves, thanks to their compact structure, low flow resistance, and rapid opening and closing, are widely used in critical systems such as petrochemicals, energy transmission, and water supply and drainage. Especially under high-pressure, high-flow conditions, butterfly valves play a core role in controlling the flow direction and regulating flow. Their sealing performance is directly related to the safe and stable operation of the system and energy loss.

[0003] Eccentric butterfly valve core designs have become a popular choice in the industry because they effectively reduce friction during opening and closing, thereby extending valve life. However, existing eccentric butterfly valves still have significant sealing flaws. Under high pressure, the medium's pressure causes the valve body to deform to a certain extent, and the eccentric structure itself creates irregular gaps between the valve core and the valve seat. These gaps cannot be completely eliminated by traditional sealing structures during forward or reverse flow, making them highly susceptible to leakage.

[0004] Existing seals are subject to constant compression and friction during frequent opening and closing operations, causing them to wear and age, leading to a rapid decline in sealing performance. Furthermore, for media containing particulate matter, these particles can embed themselves in the sealing surface, further damaging the seal structure and causing seal failure. In applications requiring extremely high sealing requirements, such as liquefied natural gas transportation and nuclear cooling systems, existing eccentric core butterfly valves struggle to achieve zero leakage and are unable to meet high-level safety integrity requirements, such as SIL3.

[0005] Existing butterfly valves rely on a single mechanical structure or static sealing design for sealing pressure regulation, lacking adaptive adjustment capabilities. When system pressure fluctuates or the sealing surface experiences unexpected wear, the sealing pressure and sealing configuration cannot be adjusted in a timely manner, significantly compromising the valve's reliability under complex operating conditions. The trend toward intelligent and green industrial development is placing higher demands on butterfly valves for sealing performance, adaptive adjustment capabilities, and long-term stability. A new butterfly valve technology that can address the sealing flaws of eccentric structures is urgently needed to ensure the safe and efficient operation of industrial systems. Summary of the Invention

[0006] The present invention provides a large-caliber bidirectional metal spherical sealing butterfly valve, which synchronously drives the piston plate to swing in the liquid level tank when the power shaft rotates, and injects the hydraulic oil in the tank into the first U-shaped rubber strip and the second U-shaped rubber strip through the hydraulic pipe; utilizing the incompressible pressure-driven characteristics of the hydraulic oil, the liquid pressure is evenly transmitted to each contact surface of the rubber strip, causing the flexible colloid to deform and closely fit the curved surface contour of the outer wall of the valve core plate; and realizes dynamic compensatory sealing of the eccentric gap and adaptive adjustment of the sealing pressure.

[0007] In order to solve the above technical problems, the technical solutions of the present invention are as follows: In a first aspect, a large-caliber bidirectional metal spherical sealing butterfly valve comprises: a valve body and a valve core plate disposed in the valve body, and further comprises: The slide is fixed in the valve body; the floating ring is slidably arranged in the slide; the limit ring is bolted to the slide; the power part is rotatably arranged on the valve body; the liquid seal part is fixed on the valve body; the hydraulic part is fixed on the valve body; The first U-shaped rubber strip is fixed on the floating ring; the second U-shaped rubber strip is fixed on the floating ring; the O-shaped sealing rubber strip is fixed on the outer wall of the valve core plate; A hydraulic hole is provided on the valve body; a hydraulic box is fixed on the valve body and located at the hydraulic hole; and a hydraulic piston is slidably arranged in the hydraulic hole and the hydraulic box.

[0008] Furthermore, the power member includes: The power shaft is rotatably arranged on the valve body and is located at a position deviated from the center of the valve body; the connecting plate has one end fixed on the power shaft and the other end fixed on the valve core plate; the sealing cover is fixed on the valve body and is rotatably arranged with the power shaft.

[0009] Furthermore, the power member includes: The function box is fixed on the valve body and rotatably sleeved on the power shaft; the steering box is fixed on the function box; the first flange is fixed on the function box and the steering box; the first threaded hole is opened on the first flange; the motor box is fixed on the steering box; the power motor is fixed in the motor box; the first bevel gear pair, the input end bevel gear is fixed on the rotating shaft of the power motor, and the output end bevel gear is fixed above the power shaft and is located in the steering box.

[0010] Furthermore, the liquid seal also includes: The liquid level tank is opened in the function box; the sealing sleeve is fixed in the function box and is rotatably connected to the power shaft. Two sealing sleeves are provided, and the two sealing sleeves are located on the upper and lower sides of the liquid level tank; the piston plate is fixed on the power shaft and is located in the liquid level tank; the hydraulic pipe is fixed on the function box and is connected to the liquid level tank.

[0011] Furthermore, the liquid seal also includes: The hydraulic hole is provided in the valve body and is connected to the hydraulic pipe; the hydraulic ring hole is provided in the valve body and is connected to the hydraulic hole and the hydraulic hole; the liquid storage tank is provided on the outer wall of the floating ring and is connected to the hydraulic hole; the first liquid separation hole is provided in the floating ring and is connected to the liquid storage tank; the first liquid blocking tank is provided on the floating ring and is connected to the first liquid separation hole; the second liquid separation hole is provided on the floating ring and is connected to the liquid storage tank; the second liquid blocking tank is provided on the floating ring and is connected to the second liquid separation hole.

[0012] Furthermore, the first U-shaped rubber strip is fixed in the first liquid-holding groove; the second U-shaped rubber strip is fixed in the second liquid-holding groove.

[0013] Furthermore, the hydraulic component further includes: The limiting strip is fixed in the hydraulic hole; the threaded collar is fixed in the hydraulic box; and the threaded rod is screwed into the threaded collar.

[0014] Furthermore, the hydraulic component further includes: The pressure plate is rotatably arranged on the threaded rod; the hydraulic spring is located between the hydraulic piston and the pressure plate; and the hand wheel is fixed on one end of the threaded rod away from the pressure plate.

[0015] Furthermore, second flanges are fixedly provided at both ends of the valve body, and second threaded holes are provided in the second flanges.

[0016] Furthermore, the floating ring is provided with a sealing strip, and there are four sealing strips, with two of the four sealing strips forming a group, and two groups of the sealing strips are respectively located on both sides of the floating ring.

[0017] The above solution of the present invention includes at least the following beneficial effects: The present invention synchronously drives the piston plate to swing in the liquid level tank when the power shaft rotates, and injects the hydraulic oil in the tank into the first U-shaped rubber strip and the second U-shaped rubber strip through the hydraulic pipe; utilizing the incompressible pressure-driven characteristics of the hydraulic oil, the liquid pressure is evenly transmitted to each contact surface of the rubber strip, causing the flexible colloid to deform and closely fit the curved surface contour of the outer wall of the valve core plate; the pressure drive of the hydraulic oil and the flexible deformation of the rubber strip form a dynamic synergistic mechanism, when the valve core plate and the floating ring produce an irregular gap due to the eccentric structure, the synergistic effect of pressure and deformation is like putting on an "adaptive pressure jacket" for the gap, realizing dynamic compensation of the eccentric gap and adaptive adjustment of the sealing pressure; when the medium flows forward, the medium pushes the floating ring to displace, pushing the floating ring, the first U-shaped rubber strip and the second U-shaped rubber strip to fit the sealing surface more closely.

[0018] The present invention adjusts the hydraulic oil pressure through a hand wheel, and the hand wheel is turned to drive the threaded rod to rotate forward and backward in the screw collar. When rotating forward, the pressure stop plate compresses the hydraulic spring, increasing the thrust on the hydraulic piston to increase the driving pressure of the hydraulic oil on the first U-shaped rubber strip and the second U-shaped rubber strip, and increasing the expansion of the rubber strip to cope with the increase in the gap; when rotating backward, the spring preload force is reduced, and the hydraulic oil pressure is reduced, which facilitates the separation of the first U-shaped rubber strip and the second U-shaped rubber strip from the O-shaped sealing strip to reduce the opening resistance; through the linkage of the hand wheel, threaded rod, screw collar, pressure stop plate and hydraulic spring, precise adjustment of the hydraulic oil pressure and sealing compensation are achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the overall structure from a first perspective of a large-caliber, bidirectional metal spherical sealing butterfly valve provided by an embodiment of the present invention; Figure 2 A large-caliber bidirectional metal spherical sealing butterfly valve provided by the embodiment of the present invention Figure 1 A magnified view of point A; Figure 3 A schematic diagram of the overall structure from a second perspective of a large-caliber, bidirectional metal spherical sealing butterfly valve provided by an embodiment of the present invention; Figure 4 A cross-sectional view of a steering box of a large-caliber bidirectional metal spherical sealing butterfly valve provided by an embodiment of the present invention; Figure 5 A large-caliber bidirectional metal spherical sealing butterfly valve provided by the embodiment of the present invention Figure 4 Enlarged view of point B; Figure 6 A cross-sectional view of a valve body of a large-caliber bidirectional metal spherical sealing butterfly valve provided in an embodiment of the present invention; Figure 7 A large-caliber bidirectional metal spherical sealing butterfly valve provided by the embodiment of the present invention Figure 6 Enlarged view of point C; Figure 8 A large-caliber bidirectional metal spherical sealing butterfly valve provided by the embodiment of the present invention Figure 6 Enlarged view of point D; Figure 9 A schematic diagram of the eccentricity of the power shaft of a large-caliber bidirectional metal spherical sealing butterfly valve provided in an embodiment of the present invention.

[0020] Description of reference numerals: Figure: 1, valve body; 101, second flange; 102, second threaded hole; 2, valve core plate; 3, slide; 4, floating ring; 401, sealing strip; 5, limit ring; 6, power part; 601, power shaft; 602, connecting plate; 603, sealing cover; 604, function box; 605, steering box; 606, first flange; 607, first threaded hole; 608, motor box; 609, power motor; 6010, first bevel gear pair; 7, liquid seal; 701, first U-shaped rubber strip; 702, second U-shaped rubber strip; 703, O-shaped Sealing strip; 704, liquid level groove; 705, sealing sleeve; 706, piston plate; 707, hydraulic pipe; 708, hydraulic hole; 709, hydraulic ring hole; 7010, liquid storage tank; 7011, first liquid separation hole; 7012, first liquid clamping tank; 7013, second liquid separation hole; 7014, second liquid clamping tank; 8, hydraulic parts; 801, hydraulic hole; 802, hydraulic box; 803, hydraulic piston; 804, limit strip; 805, threaded collar; 806, threaded rod; 807, pressure plate; 808, hydraulic spring; 809, handwheel. DETAILED DESCRIPTION

[0021] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0022] like Figures 1 to 9 As shown, an embodiment of the present invention provides a large-caliber bidirectional metal spherical sealing butterfly valve, comprising: a valve body 1 and a valve core plate 2 arranged in the valve body 1, and further comprising: a slide 3 fixed in the valve body 1; a floating ring 4 slidably arranged in the slide 3; a limit ring 5 bolted to the slide 3; a power part 6 rotatably arranged on the valve body 1; a liquid seal 7 fixed to the valve body 1; a hydraulic part 8 fixed to the valve body 1; a first U-shaped rubber strip 701 fixed to the floating ring 4; a second U-shaped rubber strip 702 fixed to the floating ring 4; an O-shaped sealing rubber strip 7 03, fixed on the outer wall of the valve core plate 2; the hydraulic hole 801, opened on the valve body 1; the hydraulic box 802, fixed on the valve body 1, and located at the hydraulic hole 801; the hydraulic piston 803, slidably set in the hydraulic hole 801 and the hydraulic box 802; the second flange 101 is fixedly set at both ends of the valve body 1, and the second flange 101 is opened with a second threaded hole 102; the floating ring 4 is provided with a sealing strip 401, and there are four sealing strips 401, and each of the four sealing strips 401 is a group of two, and the two groups of sealing strips 401 are respectively located on both sides of the floating ring 4.

[0023] Specifically, the second flanges 101 at both ends of the valve body 1 are provided with second threaded holes 102 for pipeline connection, and the slide 3 is fixed inside. The floating ring 4 can slide in the slide 3 and is fixed and limited by the limit ring 5 bolts; the power shaft 601 of the power part 6 is eccentrically installed on the valve body 1, and is transmitted through the first bevel gear pair 6010 and the power motor 609, and drives the valve core plate 2 to rotate through the connecting plate 602; the sealing surface of the valve core plate 2 is a spherical surface, and the sealing surface of the floating ring 4 is a conical surface.

[0024] As a preferred embodiment of the present invention, the power part 6 includes: a power shaft 601, which is rotatably set on the valve body 1 and is located in a position offset from the center of the valve body 1; a connecting plate 602, one end of which is fixed on the power shaft 601 and the other end is fixed on the valve core plate 2; a sealing cover 603, which is fixed on the valve body 1 and is rotatably set with the power shaft 601.

[0025] The power component 6 includes: a function box 604, fixed on the valve body 1, and rotatably sleeved on the power shaft 601; a steering box 605, fixed on the function box 604; a first flange 606, fixed on the function box 604 and the steering box 605; a first threaded hole 607, opened on the first flange 606; a motor box 608, fixed on the steering box 605; a power motor 609, fixed in the motor box 608; a first bevel gear pair 6010, the input end bevel gear is fixed on the rotating shaft of the power motor 609, and the output end bevel gear is fixed above the power shaft 601 and is located in the steering box 605.

[0026] As a preferred embodiment of the present invention, the liquid seal 7 also includes: a liquid level tank 704, which is opened in the function box 604; a sealing sleeve 705, which is fixed in the function box 604 and is rotatably connected to the power shaft 601, and is provided with two sealing sleeves 705, which are located on the upper and lower sides of the liquid level tank 704; a piston plate 706, which is fixed on the power shaft 601 and is located in the liquid level tank 704; and a hydraulic pipe 707, which is fixed on the function box 604 and is connected to the liquid level tank 704.

[0027] The liquid seal 7 also includes: a hydraulic hole 708, which is provided in the valve body 1 and is connected to the hydraulic pipe 707; a hydraulic ring hole 709, which is provided in the valve body 1 and is connected to the hydraulic hole 708 and the hydraulic hole 801; a liquid storage groove 7010, which is provided on the outer wall of the floating ring 4 and is connected to the hydraulic hole 708; a first liquid separation hole 7011, which is provided in the floating ring 4 and is connected to the liquid storage groove 7010; a first liquid blocking groove 7012, which is provided on the floating ring 4 and is connected to the first liquid separation hole 7011; a second liquid separation hole 7013, which is provided on the floating ring 4 and is connected to the liquid storage groove 7010; a second liquid blocking groove 7014, which is provided on the floating ring 4 and is connected to the second liquid separation hole 7013; a first U-shaped rubber strip 701, which is fixed in the first liquid blocking groove 7012; and a second U-shaped rubber strip 702, which is fixed in the second liquid blocking groove 7014.

[0028] Specifically, the liquid seal 7 constructs a hydraulic circulation system with the function box 604 as the core; the liquid level groove 704 in the function box 604 is sealed by two sets of upper and lower sealing sleeves 705, and the piston plate 706 on the power shaft 601 squeezes the hydraulic oil in the groove as the shaft swings, and discharges it through the hydraulic pipe 707.

[0029] As a preferred embodiment of the present invention, the hydraulic component 8 further includes: a limiting bar 804 fixed in the hydraulic hole 801; a threaded collar 805 fixed in the hydraulic box 802; and a threaded rod 806 screwed into the threaded collar 805.

[0030] The hydraulic component 8 also includes: a pressure plate 807 rotatably arranged on the threaded rod 806 ; a hydraulic spring 808 located between the hydraulic piston 803 and the pressure plate 807 ; and a handwheel 809 fixed to the end of the threaded rod 806 away from the pressure plate 807 .

[0031] Specifically, the hydraulic component 8 realizes hydraulic adjustment through mechanical transmission; the limit bar 804 in the hydraulic hole 801 limits the stroke of the hydraulic piston 803, the threaded collar 805 in the hydraulic box 802 cooperates with the threaded rod 806, and the hand wheel 809 is turned to drive the threaded rod 806 to rotate forward and backward, and the hydraulic spring 808 is compressed or released by the pressure plate 807, thereby adjusting the pressure of the hydraulic piston 803 on the system hydraulic oil.

[0032] The working principle is centered on the angle change of the valve core plate 2, and the power component 6, liquid sealing component 7 and hydraulic component 8 adjustment system operate in coordination.

[0033] When the valve core plate 2 is at 0°, it forms an open channel with the floating ring 4; when it rotates to 90°, it fits with the floating ring 4 to achieve closure.

[0034] After the power motor 609 is started, the rotating shaft of the power motor 609 drives the first bevel gear pair 6010 to rotate, thereby driving the power shaft 601 eccentrically set on the valve body 1 to rotate. The power shaft 601 drives the valve core plate 2 to separate from or close the floating ring 4 through the swing of the connecting plate 602.

[0035] During the process of the valve core plate 2 moving from opening to closing, the power shaft 601 rotates and synchronously drives the piston plate 706 to swing in the liquid level groove 704, squeezing the hydraulic oil in the liquid level groove 704 until the valve core plate 2 is completely closed, and the piston plate 706 squeezes out all the hydraulic oil; the hydraulic oil flows into the hydraulic hole 708 and the hydraulic ring hole 709 through the hydraulic pipe 707, and then is sealed with the slide 3 through the floating ring 4. The hydraulic oil enters the liquid storage tank 7010 and is injected into the first liquid-clamping groove 7012 and the second liquid-clamping groove 7014 respectively through the first liquid-dividing hole 7011 and the second liquid-dividing hole 7013, gradually filling the first U-shaped rubber strip 701 and the second U-shaped rubber strip 702.

[0036] When the valve core plate 2 is about to be completely closed, the first U-shaped rubber strip 701 and the second U-shaped rubber strip 702 are not completely filled, so that the O-shaped sealing strip 703 on the outer wall of the valve core plate 2 can pass over; after being completely closed, the first U-shaped rubber strip 701 and the second U-shaped rubber strip 702 are fully filled with hydraulic oil. At this time, the hydraulic oil, by virtue of its incompressible pressure-driven characteristics, evenly transmits the liquid pressure to each contact surface of the first U-shaped rubber strip 701 and the second U-shaped rubber strip 702; specifically, the pressure of the hydraulic oil will force the flexible colloid of the first U-shaped rubber strip 701 and the second U-shaped rubber strip 702 to deform. The rubber strip material is made of high-elasticity oil-resistant rubber with a Shore hardness designed to be 60±5HA. It can produce a radial expansion of 0.3 to 0.5 mm within the hydraulic range of 0.8-1.2 MPa. This deformation ability enables it to fit closely to the curved contour of the outer wall of the valve core plate 2.

[0037] The pressure drive of the hydraulic oil and the flexible deformation of the rubber strip form a dynamic synergistic mechanism: when an irregular gap is generated between the valve core plate 2 and the floating ring 4 due to the eccentric structure (the maximum gap can reach 0.2mm), the static pressure generated by the hydraulic oil in the inner cavity of the first U-shaped rubber strip 701 and the second U-shaped rubber strip 702 will push the rubber strip to expand toward the gap. The elastomers of the first U-shaped rubber strip 701 and the second U-shaped rubber strip 702 automatically fill the microscopic pores with a diameter of less than 0.1mm and the radial gap within 0.5mm by virtue of their memory deformation characteristics.

[0038] In Example 1, under the action of a high-pressure medium (e.g., 10 MPa), the hydraulic oil increases the oil pressure in the first and second U-shaped rubber strips 701, 702 to 1.5 MPa. At this time, the expansion of the first and second U-shaped rubber strips 701, 702 increases to 0.6 mm, which not only fills the inherent gap caused by the eccentricity of the valve core plate 2 but also offsets the deformation gap of the valve body caused by the medium pressure, forming a closed-loop adaptive adjustment of "pressure-deformation-seal". This synergistic effect allows the O-shaped rubber strip 703, the first and second U-shaped rubber strips 701, 702 to form a triple sealing barrier. The O-shaped rubber strip 703 closely adheres to the inner wall of the floating ring 4 to form a static sealing surface, while the first and second U-shaped rubber strips 701, 702 are dynamically adhered to the outer wall of the valve core plate 2 through hydraulic drive. The three work together to control leakage to below 0.01 mm³ / s, achieving the zero leakage level of the API 6D standard.

[0039] After the hydraulic oil is injected into the first U-shaped rubber strip 701 and the second U-shaped rubber strip 702, the pressure-driven characteristics are specifically reflected in the following: the hydraulic oil uses anti-wear hydraulic oil with a viscosity index ≥150, which maintains a stable oil film strength within the temperature range of -20°C to 80°C. When the system pressure fluctuates, the oil can quickly and evenly transmit the pressure to all parts of the rubber strip to avoid sealing failure caused by insufficient local pressure; the flexible deformation ability of the first U-shaped rubber strip 701 and the second U-shaped rubber strip 702 itself comes from the EPDM rubber base material used, with 20% nano-silica reinforcing agent added to make it flexible under repeated expansion and contraction. After 5000 times of expansion and contraction, it can still maintain an elastic recovery rate of more than 90%; the synergistic effect of this pressure and deformation is like putting an "adaptive pressure jacket" on the gap between the valve core plate 2 and the floating ring 4. When the medium flows in the forward direction, the force exerted by the medium to push the floating ring 4 to move, and the hydraulic oil pressure and the force of the floating ring 4 are superimposed, making the floating ring 4, the first U-shaped rubber strip 701 and the second U-shaped rubber strip 702 fit more tightly; when the medium flows in the reverse direction, the hydraulic system uses the pressure compensation mechanism to maintain the sealing surface through the first U-shaped rubber strip 701 and the second U-shaped rubber strip 702.

[0040] When the valve core plate 2 rotates from closed to open, the power shaft 601 rotates in the opposite direction to drive the piston plate 706 to form a negative pressure in the liquid level groove 704, and at the same time drives the valve core plate 2 to separate from the floating ring 4; the negative pressure of the liquid level groove 704 passes through the hydraulic pipe 707, the hydraulic hole 708, the hydraulic ring hole 709, the liquid storage tank 7010, the first liquid separation hole 7011 and the second liquid separation hole 7013, and extracts the hydraulic oil in the first liquid-holding groove 7012, the first U-shaped rubber strip 701, the second liquid-holding groove 7014 and the second U-shaped rubber strip 702, so that the first U-shaped rubber strip 701 and the second U-shaped rubber strip 702 elastically retract, ensuring that the O-ring sealing strip 703 reduces obstruction during the opening process.

[0041] The pressure regulation of the hydraulic oil is driven by the hand wheel 809: turning the hand wheel 809 drives the threaded rod 806 to rotate forward or backward in the threaded ring 805. When rotating forward, the pressure stop plate 807 is pushed to compress the hydraulic spring 808, thereby increasing the preload force of the hydraulic spring 808, and thereby increasing the thrust on the hydraulic piston 803, so that the driving pressure of the hydraulic oil on the first U-shaped rubber strip 701 and the second U-shaped rubber strip 702 is increased, and the expansion volume of the first U-shaped rubber strip 701 and the second U-shaped rubber strip 702 is increased accordingly, which can cope with the increase in the gap caused by sudden changes in the medium pressure or wear of the sealing surface; when rotating backward, the preload force of the hydraulic spring 808 is reduced, and the driving pressure of the hydraulic oil is reduced, which facilitates the separation of the first U-shaped rubber strip 701 and the second U-shaped rubber strip 702 from the O-shaped sealing strip 703, thereby reducing the opening resistance.

[0042] When fluid leakage occurs in the valve, the hydraulic oil pressure can be increased to the sealing pressure required for leakage by turning the handwheel 809 clockwise. The expansion of the first U-shaped rubber strip 701 and the second U-shaped rubber strip 702 fills the sudden leakage gap. This adjustment mechanism enables the valve to maintain sealing reliability under unexpected working conditions and meet the SIL3 safety integrity level requirements.

[0043] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A large-caliber bidirectional metal spherical sealing butterfly valve, comprising: The valve body and the valve core plate arranged in the valve body are characterized by further comprising: The slide is fixed in the valve body; the floating ring is slidably arranged in the slide; the limit ring is bolted to the slide; the power part is rotatably arranged on the valve body; the liquid seal part is fixed on the valve body; the hydraulic part is fixed on the valve body; The first U-shaped rubber strip is fixed on the floating ring; the second U-shaped rubber strip is fixed on the floating ring; the O-shaped sealing rubber strip is fixed on the outer wall of the valve core plate; A hydraulic hole is provided on the valve body; a hydraulic box is fixed on the valve body and located at the hydraulic hole; and a hydraulic piston is slidably arranged in the hydraulic hole and the hydraulic box.

2. A large-caliber bidirectional metal spherical sealing butterfly valve according to claim 1, characterized in that: The power member includes: The power shaft is rotatably arranged on the valve body and is located at a position deviated from the center of the valve body; the connecting plate has one end fixed on the power shaft and the other end fixed on the valve core plate; the sealing cover is fixed on the valve body and is rotatably arranged with the power shaft.

3. A large-caliber bidirectional metal spherical sealing butterfly valve according to claim 2, characterized in that: The power member includes: The function box is fixed on the valve body and rotatably sleeved on the power shaft; the steering box is fixed on the function box; the first flange is fixed on the function box and the steering box; the first threaded hole is opened on the first flange; the motor box is fixed on the steering box; the power motor is fixed in the motor box; the first bevel gear pair, the input end bevel gear is fixed on the rotating shaft of the power motor, and the output end bevel gear is fixed above the power shaft and is located in the steering box.

4. A large-caliber bidirectional metal spherical sealing butterfly valve according to claim 1, characterized in that: The liquid seal also includes: The liquid level tank is opened in the function box; the sealing sleeve is fixed in the function box and is rotatably connected to the power shaft. Two sealing sleeves are provided, and the two sealing sleeves are located on the upper and lower sides of the liquid level tank; the piston plate is fixed on the power shaft and is located in the liquid level tank; the hydraulic pipe is fixed on the function box and is connected to the liquid level tank.

5. A large-caliber bidirectional metal spherical sealing butterfly valve according to claim 4, characterized in that: The liquid seal also includes: The hydraulic hole is provided in the valve body and is connected to the hydraulic pipe; the hydraulic ring hole is provided in the valve body and is connected to the hydraulic hole and the hydraulic hole; the liquid storage tank is provided on the outer wall of the floating ring and is connected to the hydraulic hole; the first liquid separation hole is provided in the floating ring and is connected to the liquid storage tank; the first liquid blocking tank is provided on the floating ring and is connected to the first liquid separation hole; the second liquid separation hole is provided on the floating ring and is connected to the liquid storage tank; the second liquid blocking tank is provided on the floating ring and is connected to the second liquid separation hole.

6. A large-caliber bidirectional metal spherical sealing butterfly valve according to claim 1, characterized in that: The first U-shaped rubber strip is fixed in the first liquid-holding groove; the second U-shaped rubber strip is fixed in the second liquid-holding groove.

7. A large-caliber bidirectional metal spherical sealing butterfly valve according to claim 1, characterized in that: The hydraulic component also includes: The limiting strip is fixed in the hydraulic hole; the threaded collar is fixed in the hydraulic box; and the threaded rod is screwed into the threaded collar.

8. A large-caliber bidirectional metal spherical sealing butterfly valve according to claim 7, characterized in that: The hydraulic component also includes: The pressure plate is rotatably arranged on the threaded rod; the hydraulic spring is located between the hydraulic piston and the pressure plate; and the hand wheel is fixed on one end of the threaded rod away from the pressure plate.

9. A large-caliber bidirectional metal spherical sealing butterfly valve according to claim 1, characterized in that: Second flanges are fixedly provided at both ends of the valve body, and second threaded holes are provided in the second flanges.

10. A large-caliber bidirectional metal spherical sealing butterfly valve according to claim 1, characterized in that: The floating ring is provided with sealing strips. There are four sealing strips, and each of the four sealing strips forms a group of two. The two groups of sealing strips are respectively located on both sides of the floating ring.

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