Large-diameter bidirectional metal spherical sealing butterfly valve

Abstract

The present application relates to butterfly valve technical field, disclose a kind of large-diameter bidirectional metal spherical sealing butterfly valve, comprising: valve body and the valve core plate being arranged in valve body, further comprising: sliding platform, fixed in valve body;Floating ring, slidingly arranged in sliding platform;Limiting ring, bolted on sliding platform;Power piece, rotationally arranged on valve body;Liquid seal, fixed on valve body;Hydraulic part, fixed on valve body;First U-shaped rubber strip, fixed on floating ring;Second U-shaped rubber strip, fixed on floating ring;O-shaped sealing rubber strip, fixed on the outer wall of valve core plate;The present application is synchronous belt driven piston plate in liquid level groove swing when power shaft rotates, and the hydraulic oil in groove is injected into first U-shaped rubber strip and second U-shaped rubber strip by hydraulic pipe;Using the incompressible pressure driving characteristics of hydraulic oil, hydraulic pressure is evenly transmitted to each contact surface of rubber strip, to cause flexible rubber to deform and closely adhere to the curved surface profile of valve core plate outer wall.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of butterfly valves, and in particular to a large-diameter bidirectional metal spherical sealing butterfly valve. BACKGROUND

[0002] In the modern industrial field, large-diameter butterfly valves are widely used in key systems such as petroleum and chemical industry, energy transportation, water supply and drainage, etc. due to their compact structure, small flow resistance, rapid opening and closing, etc. Especially under high pressure and large flow conditions, butterfly valves play a core role in controlling the flow direction of the medium and adjusting the flow rate, and their sealing performance is directly related to the safe and stable operation of the system and energy loss.

[0003] The butterfly valve core design with eccentric structure has become one of the mainstream choices in the industry because it can effectively reduce the friction resistance during opening and closing, and prolong the service life of the valve. However, the existing eccentric valve core butterfly valve still has significant defects in sealing performance. In a high-pressure environment, the medium pressure will cause the valve body to deform to some extent, and the eccentric structure itself will cause irregular gaps between the valve core and the valve seat. When the medium flows forward or reversely, these gaps cannot be completely eliminated by traditional sealing structures, which can easily cause medium leakage.

[0004] In high-frequency opening and closing operations, the existing sealing element is easily worn and aged due to long-term extrusion and friction, and the sealing performance quickly deteriorates. For media containing particulate impurities, impurity particles can embed into the sealing surface, further damaging the sealing structure and causing sealing failure. In some places with extremely high sealing requirements, such as liquefied natural gas transportation, nuclear industry cooling systems, etc., the existing eccentric valve core butterfly valve cannot meet the zero leakage standard and cannot meet the high-level safety integrity requirements such as SIL3.

[0005] The sealing pressure adjustment of the existing butterfly valve mainly depends on a single mechanical structure or static sealing design, and lacks self-adaptive adjustment capability. When the system pressure fluctuates or the sealing surface is unexpectedly worn, the sealing pressure and sealing shape cannot be adjusted in time, which greatly reduces the reliability of the valve under complex working conditions. With the development trend of industrial intelligentization and greenization, higher requirements are put forward for the sealing performance, self-adaptive adjustment capability and long-term stability of butterfly valves. A new type of butterfly valve technology is urgently needed to solve the sealing defects of the eccentric structure to ensure the safe and efficient operation of industrial systems. SUMMARY

[0006] The application provides a large-diameter bidirectional metal spherical sealing butterfly valve, which is characterized in that: when a power shaft rotates, a piston plate is synchronously driven to swing in a liquid level groove, and hydraulic oil in the groove is injected into first and second U-shaped rubber strips through a hydraulic pipe; the incompressible pressure driving characteristics of the hydraulic oil are utilized, the hydraulic pressure is uniformly transmitted to each contact surface of the rubber strip, the flexible rubber body is deformed and tightly attached to the curved surface profile of the outer wall of the valve core plate, and dynamic compensation sealing of the eccentric gap and self-adaptive adjustment of the sealing pressure are realized.

[0007] To solve the above technical problems, the technical scheme of the application is as follows:

[0008] In a first aspect, a large-diameter bidirectional metal spherical sealing butterfly valve comprises a valve body and a valve core plate arranged in the valve body, and further comprises:

[0009] A sliding table is fixed in the valve body, a floating ring is slidingly arranged in the sliding table, a limiting ring is bolted to the sliding table, a power member is rotationally arranged on the valve body, a liquid sealing member is fixed to the valve body, and a hydraulic member is fixed to the valve body.

[0010] A first U-shaped rubber strip is fixed to the floating ring, a second U-shaped rubber strip is fixed to the floating ring, and an O-shaped sealing rubber strip is fixed to the outer wall of the valve core plate.

[0011] A hydraulic hole is formed in the valve body, a hydraulic box is fixed to the valve body and located at the hydraulic hole, and a hydraulic piston is slidingly arranged in the hydraulic hole and the hydraulic box.

[0012] Further, the power member comprises:

[0013] A power shaft is rotationally arranged on the valve body and located at a position deviated from the center of the valve body, a connecting plate is fixed at one end to the power shaft and at the other end to the valve core plate, and a sealing cover is fixed to the valve body and rotationally arranged with the power shaft.

[0014] Further, the power member comprises:

[0015] A function box is fixed to the valve body and rotationally sleeved on the power shaft, a steering box is fixed to the function box, a first flange is fixed to the function box and the steering box, a first threaded hole is formed in the first flange, a motor box is fixed to the steering box, a power motor is fixed in the motor box, and a first bevel gear pair is arranged with an input end bevel gear fixed to the rotating shaft of the power motor and an output end bevel gear fixed above the power shaft and located in the steering box.

[0016] Further, the liquid sealing member further comprises:

[0017] Liquid level tank is arranged in the function box, sealing sleeve is fixed in the function box, and is rotationally connected with the power shaft, two sealing sleeves are arranged on the upper and lower sides of the liquid level tank, the piston plate is fixed on the power shaft and located in the liquid level tank, the hydraulic pipe is fixed on the function box and is communicated with the liquid level tank.

[0018] Further, the liquid seal further comprises:

[0019] The liquid hole is arranged in the valve body and communicated with the hydraulic pipe, the liquid ring hole is arranged in the valve body and communicated with the liquid hole and the hydraulic hole, the liquid storage tank is arranged on the outer wall of the floating ring and communicated with the liquid hole, the first liquid distribution hole is arranged in the floating ring and communicated with the liquid storage tank, the first liquid storage groove is arranged on the floating ring and communicated with the first liquid distribution hole, the second liquid distribution hole is arranged on the floating ring and communicated with the liquid storage tank, and the second liquid storage groove is arranged on the floating ring and communicated with the second liquid distribution hole.

[0020] Further, the first U-shaped rubber strip is fixed in the first liquid storage groove, and the second U-shaped rubber strip is fixed in the second liquid storage groove.

[0021] Further, the hydraulic part further comprises:

[0022] The limiting strip is fixed in the hydraulic hole, the threaded sleeve ring is fixed in the hydraulic box, and the threaded rod is screwedly inserted into the threaded sleeve ring.

[0023] Further, the hydraulic part further comprises:

[0024] The pressing plate is rotationally arranged on the threaded rod, the hydraulic spring is arranged between the hydraulic piston and the pressing plate, and the hand wheel is fixed at the end of the threaded rod away from the pressing plate.

[0025] Further, the valve body is fixedly provided with a second flange at two ends, and the second flange is provided with a second threaded hole.

[0026] Further, the floating ring is provided with a sealing strip, the sealing strip is provided with four, every two of the four sealing strips is a group, and the two groups of sealing strips are located on the two sides of the floating ring.

[0027] The above scheme of the present application at least has the following beneficial effects:

[0028] The application drives the piston plate to swing in the liquid level tank by the synchronous belt 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; the incompressible pressure driving characteristics of the hydraulic oil are utilized, the hydraulic pressure is uniformly transmitted to each contact surface of the rubber strip, the flexible rubber body is deformed and closely adheres to the curved surface profile of the outer wall of the valve core plate; the pressure driving and the flexible deformation of the rubber strip form a dynamic cooperation mechanism, when the valve core plate and the floating ring produce irregular gaps due to the eccentric structure, the cooperation of the pressure and the deformation is like wearing an "adaptive pressure sleeve" for the gap, realizing the dynamic compensation of the eccentric gap and the adaptive adjustment of the sealing pressure; when the medium flows forward, the medium pushes the floating ring to displace, and pushes the floating ring, the first U-shaped rubber strip and the second U-shaped rubber strip to more closely adhere to the sealing surface.

[0029] The application adjusts the hydraulic oil pressure through the hand wheel, rotates the hand wheel to drive the threaded rod to rotate in and out in the screw sleeve ring, when rotating in, the pressure stop plate compresses the hydraulic spring, increases the pushing force 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 increases the expansion amount of the rubber strip to cope with the increase of the gap; when rotating out, the spring pre-tightening force decreases, the hydraulic oil pressure decreases, the first U-shaped rubber strip and the second U-shaped rubber strip are separated from the O-shaped sealing rubber strip to reduce the opening resistance; through the linkage of the hand wheel, the threaded rod, the screw sleeve ring, the pressure stop plate and the hydraulic spring, the hydraulic oil pressure is accurately adjusted and sealed. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 A first perspective view of the overall structure of a large-diameter bidirectional metal spherical sealing butterfly valve is provided for the embodiment of the application.

[0031] Figure 2 A second perspective view of the overall structure of a large-diameter bidirectional metal spherical sealing butterfly valve is provided for the embodiment of the application. Figure 1 An enlarged view of A of the large-diameter bidirectional metal spherical sealing butterfly valve.

[0032] Figure 3 A second perspective view of the overall structure of a large-diameter bidirectional metal spherical sealing butterfly valve is provided for the embodiment of the application.

[0033] Figure 4 A sectional view of a steering box of a large-diameter bidirectional metal spherical sealing butterfly valve is provided for the embodiment of the application.

[0034] Figure 5 An enlarged view of B of the large-diameter bidirectional metal spherical sealing butterfly valve. Figure 4

[0035] Figure 6 A sectional view of a valve body of a large-diameter bidirectional metal spherical sealing butterfly valve is provided for the embodiment of the application.

[0036] Figure 7 ​An enlarged view of C of the large-diameter bidirectional metal spherical sealing butterfly valve provided by the embodiment of the present application Figure 6 An enlarged view of D of the large-diameter bidirectional metal spherical sealing butterfly valve provided by the embodiment of the present application

[0037] Figure 8 An enlarged view of D of the large-diameter bidirectional metal spherical sealing butterfly valve provided by the embodiment of the present application Figure 6 An enlarged view of D of the large-diameter bidirectional metal spherical sealing butterfly valve provided by the embodiment of the present application

[0038] Figure 9 An eccentric schematic view of the power shaft of the large-diameter bidirectional metal spherical sealing butterfly valve provided by the embodiment of the present application

[0039] Explanation of reference signs:

[0040] In the figure: 1, valve body; 101, second flange; 102, second threaded hole; 2, valve core plate; 3, sliding table; 4, floating ring; 401, sealing strip; 5, limiting ring; 6, power element; 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 sealing element; 701, first U-shaped rubber strip; 702, second U-shaped rubber strip; 703, O-shaped sealing rubber strip; 704, liquid level groove; 705, sealing sleeve; 706, piston plate; 707, hydraulic pipe; 708, liquid driving hole; 709, liquid driving ring hole; 7010, liquid storage tank; 7011, first liquid distribution hole; 7012, first liquid retaining groove; 7013, second liquid distribution hole; 7014, second liquid retaining groove; 8, hydraulic element; 801, hydraulic hole; 802, hydraulic box; 803, hydraulic piston; 804, limiting strip; 805, threaded sleeve ring; 806, threaded rod; 807, pressing plate; 808, hydraulic spring; 809, hand wheel. DETAILED DESCRIPTION

[0041] Exemplary embodiments of the present application will be described herein below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it is understood that the present application can be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.

[0042] As Figures 1 to 9As shown, the embodiment of the present application provides a large-diameter bidirectional metal spherical sealing butterfly valve, which comprises a valve body 1, a valve core plate 2 arranged in the valve body 1, a sliding table 3 fixed in the valve body 1, a floating ring 4 slidingly arranged in the sliding table 3, a limiting ring 5 bolted on the sliding table 3, a power piece 6 rotatably arranged on the valve body 1, a liquid seal piece 7 fixed on the valve body 1, a hydraulic piece 8 fixed on the valve body 1, a first U-shaped rubber strip 701 fixed on the floating ring 4, a second U-shaped rubber strip 702 fixed on the floating ring 4, an O-shaped sealing rubber strip 703 fixed on the outer wall of the valve core plate 2, a hydraulic hole 801 formed on the valve body 1, a hydraulic box 802 fixed on the valve body 1 and located at the hydraulic hole 801, a hydraulic piston 803 slidingly arranged in the hydraulic hole 801 and the hydraulic box 802, and second flanges 101 fixedly arranged at both ends of the valve body 1, wherein the second flanges 101 are provided with second threaded holes 102, and the floating ring 4 is provided with sealing strips 401, and four sealing strips 401 are arranged in two groups, and the two groups of sealing strips 401 are located on both sides of the floating ring 4.

[0043] Specifically, the second flanges 101 at both ends of the valve body 1 are provided with the second threaded holes 102 for pipeline connection, the sliding table 3 is fixed inside, the floating ring 4 can slide in the sliding table 3 and is limited by the limiting ring 5 bolted, the power shaft 601 of the power piece 6 is eccentrically installed on the valve body 1, is driven by the power motor 609 through the first bevel gear pair 6010, and drives the valve core plate 2 to rotate through the connecting plate 602, and 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.

[0044] As a preferred embodiment of the present application, the power piece 6 comprises a power shaft 601 rotatably arranged on the valve body 1 and located at a central offset position of the valve body 1, a connecting plate 602 fixed at one end of the power shaft 601 and at the other end of the valve core plate 2, and a sealing cover 603 fixed on the valve body 1 and rotatably arranged with the power shaft 601.

[0045] The power piece 6 comprises 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 formed 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, and a first bevel gear pair 6010 with an input end bevel gear fixed on a rotating shaft of the power motor 609 and an output end bevel gear fixed above the power shaft 601 and located in the steering box 605.

[0046] As a preferred embodiment of the present application, the liquid seal 7 further comprises: a liquid level tank 704 arranged in the function box 604; two sealing sleeves 705 fixed in the function box 604 and rotatably connected with the power shaft 601; a piston plate 706 fixed on the power shaft 601 and located in the liquid level tank 704; and a hydraulic pipe 707 fixed on the function box 604 and connected with the liquid level tank 704.

[0047] The liquid seal 7 further comprises: a liquid driving hole 708 arranged in the valve body 1 and connected with the hydraulic pipe 707; a liquid driving ring hole 709 arranged in the valve body 1 and connected with the liquid driving hole 708 and the hydraulic hole 801; a liquid storage tank 7010 arranged on the outer wall of the floating ring 4 and connected with the liquid driving hole 708; a first liquid distribution hole 7011 arranged in the floating ring 4 and connected with the liquid storage tank 7010; a first liquid retaining groove 7012 arranged on the floating ring 4 and connected with the first liquid distribution hole 7011; a second liquid distribution hole 7013 arranged on the floating ring 4 and connected with the liquid storage tank 7010; a second liquid retaining groove 7014 arranged on the floating ring 4 and connected with the second liquid distribution hole 7013; a first U-shaped rubber strip 701 fixed in the first liquid retaining groove 7012; and a second U-shaped rubber strip 702 fixed in the second liquid retaining groove 7014.

[0048] Specifically, the liquid seal 7 constructs a hydraulic circulation system with the function box 604 as the core; the liquid level tank 704 in the function box 604 is sealed by the upper and lower sealing sleeves 705, and the piston plate 706 on the power shaft 601 extrudes the hydraulic oil in the tank and leads it out through the hydraulic pipe 707 when the shaft swings.

[0049] As a preferred embodiment of the present application, the hydraulic part 8 further comprises: a limiting strip 804 fixed in the hydraulic hole 801; a threaded sleeve 805 fixed in the hydraulic box 802; and a threaded rod 806 screwedly inserted in the threaded sleeve 805.

[0050] The hydraulic part 8 further comprises: a pressing plate 807 rotatably arranged on the threaded rod 806; a hydraulic spring 808 located between the hydraulic piston 803 and the pressing plate 807; and a hand wheel 809 fixed on the threaded rod 806 away from the pressing plate 807.

[0051] Specifically, the hydraulic part 8 realizes hydraulic adjustment through mechanical transmission; the limiting strip 804 in the hydraulic hole 801 limits the stroke of the hydraulic piston 803, the threaded sleeve 805 in the hydraulic box 802 cooperates with the threaded rod 806, and rotating the hand wheel 809 drives the threaded rod 806 to rotate in or out, thereby compressing or releasing the hydraulic spring 808 through the pressing plate 807, so as to adjust the pressure of the hydraulic piston 803 on the system hydraulic oil.

[0052] The working principle is based on the angle change of the valve core plate 2, and the power component 6, the liquid seal component 7 and the hydraulic component 8 cooperatively work.

[0053] When the valve core plate 2 is at 0°, an open channel is formed with the floating ring 4; when rotated to 90°, the valve core plate 2 is in close contact with the floating ring 4 to achieve closure.

[0054] After the power motor 609 is started, the rotating shaft of the power motor 609 drives the first bevel gear pair 6010 to rotate, and then drives the power shaft 601 eccentrically arranged on the valve body 1 to rotate, and the power shaft 601 drives the valve core plate 2 to separate from or close to the floating ring 4 through the swing of the connecting plate 602.

[0055] In the process of the valve core plate 2 from opening to closing, the power shaft 601 rotates synchronously to drive the piston plate 706 to swing in the liquid level groove 704, and the hydraulic oil in the liquid level groove 704 is extruded, until the valve core plate 2 is completely closed, the piston plate 706 extrudes 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 by the floating ring 4 and the sliding table 3, and then enters the liquid storage tank 7010, and then is injected into the first liquid clamping groove 7012 and the second liquid clamping groove 7014 through the first liquid distribution hole 7011 and the second liquid distribution hole 7013 respectively, and gradually fills the first U-shaped rubber strip 701 and the second U-shaped rubber strip 702.

[0056] 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 rubber strip 703 on the outer wall of the valve core plate 2 can pass through; after complete closure, the first U-shaped rubber strip 701 and the second U-shaped rubber strip 702 are fully filled with hydraulic oil, and at this time, the hydraulic oil drives the hydraulic pressure to be uniformly transmitted to each contact surface of the first U-shaped rubber strip 701 and the second U-shaped rubber strip 702 due to the incompressible pressure driving characteristics of the hydraulic oil; specifically, the pressure of the hydraulic oil will force the flexible rubber of the first U-shaped rubber strip 701 and the second U-shaped rubber strip 702 to deform, and the rubber strip material is selected to be high-elasticity oil-resistant rubber, and the Shore hardness is designed to be 60±5HA, which can produce a radial expansion amount of 0.3-0.5mm within a hydraulic pressure range of 0.8-1.2MPa, and this deformation capacity enables it to closely fit the curved profile of the outer wall of the valve core plate 2.

[0057] The pressure driving of the hydraulic oil and the flexible deformation of the rubber strip form a dynamic cooperative mechanism: when the valve core plate 2 and the floating ring 4 have irregular gaps due to the eccentric structure (the maximum gap can reach 0.2mm), the static pressure formed 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 to the gap, and the elastomer of the first U-shaped rubber strip 701 and the second U-shaped rubber strip 702 will automatically fill the micro-pores with a diameter of less than 0.1mm and the radial gap within 0.5mm due to the memory deformation characteristics.

[0058] In the embodiment 1, under the action of high-pressure medium (such as 10 MPa working condition), the hydraulic oil can increase the oil pressure in the first U-shaped rubber strip 701 and the second U-shaped rubber strip 702 to 1.5 MPa, at this time, the expansion amount of the first U-shaped rubber strip 701 and the second U-shaped rubber strip 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 self-adaptive adjustment of "pressure-deformation-sealing"; under the synergistic effect, the O-shaped sealing rubber strip 703, the first U-shaped rubber strip 701 and the second U-shaped rubber strip 702 form a triple sealing barrier, the O-shaped sealing rubber strip 703 tightly abuts the inner wall of the floating ring 4 to form a static sealing surface, and the first U-shaped rubber strip 701 and the second U-shaped rubber strip 702 dynamically abut the outer wall of the valve core plate 2 through hydraulic drive, and the three cooperate to control the leakage to below 0.01 mm³ / s, reaching the zero leakage level of API 6D standard.

[0059] After the hydraulic oil is injected into the first U-shaped rubber strip 701 and the second U-shaped rubber strip 702, the pressure driving characteristic is specifically embodied as follows: the hydraulic oil adopts anti-wear hydraulic oil with viscosity index ≥ 150, which maintains stable oil film strength in the temperature range of -20°C to 80°C, when the system pressure fluctuates, the oil can quickly and uniformly conduct the pressure to each part of the rubber strip, avoiding the sealing failure caused by insufficient local pressure; and the flexible deformation capability of the first U-shaped rubber strip 701 and the second U-shaped rubber strip 702 is derived from the use of ethylene-propylene-diene rubber base material, adding 20% of nano-sized silicon dioxide reinforcing agent, so that it can maintain an elastic recovery rate of more than 90% after 5000 times of repeated expansion and contraction; the synergistic effect of pressure and deformation is like "self-adaptive pressure sleeve" for the gap between the valve core plate 2 and the floating ring 4, when the medium flows forward, the medium pushes the floating ring 4 to displace the force, the hydraulic oil pressure and the force of the floating ring 4 are superimposed, so that the floating ring 4, the first U-shaped rubber strip 701 and the second U-shaped rubber strip 702 are more closely abutted; when the medium flows reversely, the hydraulic system maintains the sealing of the sealing surface through the first U-shaped rubber strip 701 and the second U-shaped rubber strip 702 by the pressure compensation mechanism.

[0060] When the valve core plate 2 is closed to open, the power shaft 601 reversely rotates to drive the piston plate 706 to form negative pressure in the liquid level tank 704, and simultaneously drives the valve core plate 2 and the floating ring 4 to separate; the negative pressure of the liquid level tank 704 passes through the hydraulic pipe 707, the hydraulic hole 708, the hydraulic ring hole 709, the liquid storage tank 7010, the first liquid distribution hole 7011 and the second liquid distribution hole 7013, extracts the hydraulic oil in the first liquid storage tank 7012, the first U-shaped rubber strip 701, the second liquid storage tank 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-shaped sealing rubber strip 703 reduces the obstruction in the opening process.

[0061] The pressure adjustment of the hydraulic oil is driven by the hand wheel 809: rotating the hand wheel 809 drives the threaded rod 806 to rotate in or out of the threaded sleeve 805, when rotating in, the pressure stop plate 807 pushes the hydraulic spring 808 to compress, increases the pre-tightening force of the hydraulic spring 808, and further increases the pushing force 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 amount 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 of the gap caused by the sudden change of the medium pressure or the wear of the sealing surface; when rotating out, the pre-tightening force of the hydraulic spring 808 is reduced, the driving pressure of the hydraulic oil is reduced, and the first U-shaped rubber strip 701 and the second U-shaped rubber strip 702 are separated from the O-shaped sealing rubber strip 703, thereby reducing the opening resistance.

[0062] When the valve leaks fluid, by rotating the hand wheel 809 clockwise, the hydraulic oil pressure can be increased to the sealing pressure required by the leakage, and the first U-shaped rubber strip 701 and the second U-shaped rubber strip 702 can fill the sudden leakage gap, and the valve can still maintain sealing reliability under unexpected working conditions under this adjustment mechanism, and meet the SIL3 safety integrity level requirement.

[0063] The above is the preferred embodiment of the present application, it should be noted that for ordinary skilled in the art, without departing from the principles of the present application, can also make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

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 power shaft is rotatably mounted on the valve body and is located at a position offset from the center of the valve body; the function box is fixed on the valve body and rotatably sleeved on the power shaft; The hydraulic hole is opened on the valve body; the hydraulic box is fixed on the valve body and located at the hydraulic hole; the hydraulic piston is slidably set in the hydraulic hole and the hydraulic box 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; The liquid seal also includes: a liquid level tank, which is provided in the function box; a sealing sleeve, which is fixed in the function box and is rotatably connected to the power shaft, and is provided with two sealing sleeves, and the two sealing sleeves are located on the upper and lower sides of the liquid level tank; a piston plate, which is fixed on the power shaft and is located in the liquid level tank; a hydraulic pipe, which is fixed on the function box and is connected to the liquid level tank; a hydraulic hole, which is provided in the valve body and is connected to the hydraulic pipe; a hydraulic ring hole, which is provided in the valve body and is connected to the hydraulic hole and the hydraulic hole; a liquid storage tank, which is provided on the outer wall of the floating ring and is connected to the liquid hole; a first liquid separation hole, which is provided in the floating ring and is connected to the liquid storage tank; a first liquid clamping tank, which is provided on the floating ring and is connected to the first liquid separation hole; a second liquid separation hole, which is provided on the floating ring and is connected to the liquid storage tank; a second liquid clamping tank, which is provided on the floating ring and is connected to the second liquid separation hole.

2. A large-caliber bidirectional metal spherical sealing butterfly valve according to claim 1, characterized in that: The power member includes: 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 arranged to rotate 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 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 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.

5. 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.

6. A large-caliber bidirectional metal spherical sealing butterfly valve according to claim 5, 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.

7. 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.

8. 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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