XN type two-way pressure metal sealing butterfly valve and using method thereof

Abstract

The invention belongs to the technical field of valves, and particularly relates to an XN type two-way pressure metal sealing butterfly valve and a using method thereof.The XN type two-way pressure metal sealing butterfly valve comprises a valve body, an end cover is arranged at the bottom of the valve body, and a support and a worm wheel head are arranged at the top of the valve body; the butterfly plate is arranged in the valve body; the valve body connected valve seat is arranged in the valve body, and the valve body connected valve seat is formed by surfacing a body and machining a positive cone; the valve rod is arranged on the valve body and used for driving the butterfly plate to move, and the valve rod is in transmission connection with the worm wheel head; the energy storage type metal sealing piece is arranged on the butterfly plate and can be matched with the valve body connected valve seat to form two-way sealing; wherein the energy storage type metal sealing pieces are distributed on the edge of the butterfly plate in the circumferential direction of the butterfly plate, compared with the prior art, it is guaranteed that the XN type two-way pressure metal sealing butterfly valve has the good sealing effect all the time in the frequent opening and closing process, the phenomenon that a sealing face fails is reduced, and the sealing stability of the butterfly valve is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of valves, and in particular relates to an XN type bidirectional pressure metal sealing butterfly valve and a use method thereof. Background Art

[0002] The butterfly valve is a common valve widely used in fluid control systems. With its simple structure, easy operation and low fluid resistance, it has become an important component in many industrial fields. For example, the metal-sealed butterfly valve disclosed in the patent with application number CN201711115081.X includes: a valve body, which is integrated with the valve seat; a valve stem, the upper end of which passes through the valve body and is connected to the actuator; a butterfly plate, which is fixed on the valve stem, the axial center of the butterfly plate forms an axial eccentricity with the center of the valve body shaft, and the radial center of the butterfly plate forms a radial eccentricity with the center of the valve body channel; a metal sealing ring, which is an inclined cone surface, forming a sealing pair with the valve seat sealing surface, and the center line of the sealing pair forms an eccentric angle with the radial center of the butterfly plate; and a bottom cover, which is located at the bottom of the valve body and the valve stem;

[0003] During the use of this existing metal-sealed butterfly valve, frequent opening and closing operations will still affect the sealing effect, eventually leading to failure of the sealing surface. The low sealing stability makes it unable to meet the needs of pipelines that require frequent opening and closing, so it is necessary to make improvements. Summary of the invention

[0004] The object of the present invention is to provide an XN type bidirectional pressure metal-sealed butterfly valve and a method of using the same in order to further improve the sealing stability of the metal-sealed butterfly valve in view of the above-mentioned technical problems.

[0005] In view of this, the present invention provides an XN type bidirectional pressure metal sealing butterfly valve, comprising:

[0006] A valve body, wherein an end cover is disposed at the bottom of the valve body, and a bracket and a worm gear head are disposed at the top of the valve body;

[0007] A butterfly plate, wherein the butterfly plate is arranged in the valve body;

[0008] A valve body integrated valve seat, wherein the valve body integrated valve seat is arranged in the valve body, and the valve body integrated valve seat is formed by positive cone surfacing of the valve body;

[0009] A valve stem, which is arranged on the valve body and is used to drive the butterfly plate to move, and the valve stem is drivingly connected to the worm gear head;

[0010] Also includes:

[0011] Energy storage metal seal, which is arranged on the butterfly plate and can cooperate with the valve body integrated valve seat to form a bidirectional seal;

[0012] Wherein, the energy storage type metal seal is distributed on the edge of the butterfly plate along the circumference of the butterfly plate.

[0013] In the present technical scheme, during the use of the XN type bidirectional pressure metal sealed butterfly valve, the movement of the butterfly plate is controlled by the worm gear head driving the movement of the valve stem. When the butterfly plate is closed, the energy storage metal seal cooperates with the valve body integrated valve seat to form a bidirectional seal, which effectively improves the sealing effect of the butterfly valve, so that the XN type bidirectional pressure metal sealed butterfly valve can adapt to the use requirements of multiple fields. At the same time, the energy storage metal seal has an energy storage effect, that is, when the energy storage metal seal forms a sealing surface, the sealing surface can produce an effect of becoming tighter and tighter as the butterfly plate is continuously closed, and when the valve is opened, the energy storage metal seal can release energy, so that the energy storage metal seal can be reset to its initial state, ensuring that the XN type bidirectional pressure metal sealed butterfly valve always has a good sealing effect during the frequent opening and closing process, reducing the failure of the sealing surface, and improving the sealing stability of the butterfly valve.

[0014] In the above technical solution, further, the energy storage metal seal also includes:

[0015] A sealing ring, wherein the sealing ring is in a "Γ" shape;

[0016] A spiral wound gasket, wherein the spiral wound gasket is a spiral wound gasket that is resistant to high temperature, low temperature and corrosion;

[0017] An adjustable sealing type pressure ring, which can be fixedly mounted on the butterfly plate by means of circumferential screws, and has an outer circle of a pressure plate ring for supporting the transversely extending end of the "Γ"-shaped sealing ring;

[0018] An internal pressure cavity, wherein the internal pressure cavity is located between the sealing ring and the regulating sealing type pressure ring;

[0019] An energy storage ring, which is arranged in the internal pressure cavity and can support the sealing ring and enable the sealing ring to achieve automatic reset and sealing compensation;

[0020] The sealing ring is arranged along the circumference of the butterfly plate, the spiral wound gasket is arranged between the sealing ring and the butterfly plate, the sealing ring is fixed on the butterfly plate by adjusting the sealing pressure ring, and the energy storage ring is concentrically distributed with the sealing ring.

[0021] In the above technical solution, further, the energy storage ring has an annular cavity concentrically distributed with the energy storage ring.

[0022] In the above technical solution, further, the energy storage ring is made of 17-7PH austenite-martensite precipitation hardening stainless steel.

[0023] In the above technical solution, further, the energy storage ring is made of Inconel X-750 nickel-based high-temperature alloy.

[0024] In the above technical solution, further, the sealing ring is a metal sealing ring, and the sealing ring can be built-up with STL Stellite alloy or spray-welded with WC tungsten carbide and nickel-based alloy.

[0025] In the above technical solution, further, the butterfly plate is a turtle-back type butterfly plate.

[0026] In the above technical solution, further, a combined stuffing box is arranged between the valve stem and the valve body. The combined stuffing box can be a high-temperature combined stuffing box or an ultra-low-temperature combined stuffing box used alone, or a high-temperature combined stuffing box and an ultra-low-temperature combined stuffing box used together.

[0027] In the above technical scheme, further, the high-temperature combined stuffing box can be composed of a high-temperature steel base, a flexible graphite self-lubricating bearing, a chromium-nickel stainless steel stuffing pad, braided graphite and flexible graphite. The high-temperature combined stuffing box can be tightened and sealed by a stuffing gland pre-tightening device, and the ultra-low-temperature combined stuffing box can be pre-tightened by a combination of disc springs and disc spring pads, and tightened and sealed by graphite ring pads and stuffing glands.

[0028] In the above technical solution, further, the present invention also discloses a method for using the above XN type bidirectional pressure metal sealing butterfly valve, comprising the following steps:

[0029] S1 valve is closed. During the valve closing process, the valve stem is driven to move by the worm gear head. The butterfly plate cooperates with the valve body integrated valve seat as the valve stem moves. At this time, the energy storage metal seal forms a sealing surface with the valve body integrated valve seat. At the same time, the energy storage ring supports the sealing ring. The energy storage ring and the sealing ring work together. When the valve is closed, the sealing ring is continuously pressed against the valve body integrated valve seat as the butterfly plate is continuously closed.

[0030] S2 plate lifting compensation: when the medium in the valve body reacts, the sealing ring combines with the energy storage ring, and the sealing ring can automatically reset and compensate for the plate lifting under the support of the energy storage ring;

[0031] S3 valve is opened. During the valve opening process, the valve stem is driven by the worm gear head, and the butterfly plate is released from the valve seat connected with the valve body as the valve stem moves. At the same time, under the action of the energy storage ring, the sealing ring is reset to the initial state;

[0032] S4 energy storage ring removal: when there is no reverse force from the medium on the pipe network, remove the adjustable sealing type pressure ring to remove the energy storage ring.

[0033] In the present technical scheme, when the XN type bidirectional pressure metal sealed butterfly valve is in use, the butterfly valve sealing pair is designed with a sealing ring and an energy storage ring in combination. When closing the valve, it can be closed tighter and tighter, and when opening the valve, it can be reset to the initial state under the action of the energy storage ring. It has a good sealing effect during frequent opening and closing. When the medium reacts, the sealing ring can combine with the energy storage ring to form a lifting plate compensation, realizing the radial dynamic balance principle, ensuring that the sealing requirements are met in both positive and negative directions, with superior performance and a wide range of applications. When there is no reverse force from the medium on the pipeline network, the adjustable sealing pressure ring will be disassembled, thereby disassembling the energy storage ring, which can completely replace the alternative product of the three-eccentric butterfly valve.

[0034] The beneficial effects of the present invention are:

[0035] 1. The energy storage metal seal is set to ensure that the XN type bidirectional pressure metal seal butterfly valve has a good sealing effect during frequent opening and closing, reducing the failure of the sealing surface and improving the sealing stability of the butterfly valve;

[0036] 2. The energy storage ring is made of Inconel X-750 nickel-based high-temperature alloy, which has good corrosion resistance and oxidation resistance, good relaxation resistance, and good forming and welding properties, thereby effectively improving the energy storage effect and service life of the energy storage ring;

[0037] 3. By surfacing STL Stellite alloy or spraying WC tungsten carbide and nickel-based alloy on the sealing ring, the sealing ring's resistance to erosion and corrosion under harsh working conditions can be effectively improved;

[0038] 4. Through the setting of the combined stuffing box, the high-temperature combined stuffing box is suitable for high-temperature media and corrosive media, and the ultra-low-temperature combined stuffing box is suitable for ultra-low-temperature media. By selecting the appropriate high-temperature combined stuffing box or the ultra-low-temperature combined stuffing box, the butterfly valve can be applied to different working conditions, thereby improving the versatility of the butterfly valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0040] Figure 1 It is a schematic structural diagram of a specific implementation method of the present invention.

[0041] Figure 2 It is a schematic diagram of the side view structure of the present invention.

[0042] Figure 3 It is a schematic diagram of the butterfly plate structure of the present invention.

[0043] Figure 4 It is a schematic diagram of the top view structure of the butterfly plate of the present invention.

[0044] Figure 5 It is a schematic diagram of the front view structure of the butterfly plate of the present invention.

[0045] Figure 6 For the present invention Figure 3 Schematic diagram of the structure of the partial enlarged view of part A in the middle.

[0046] The symbols in the figure are:

[0047] 1. Valve body; 2. End cover; 3. Bracket; 4. Worm gear head; 5. Butterfly plate; 6. Valve body integrated valve seat; 7. Valve stem; 8. Energy storage metal seal; 80. Sealing ring; 81. Spiral wound gasket; 82. Adjustable sealing pressure ring; 83. Circumferential screw; 84. Internal pressure cavity; 85. Energy storage ring; 850. Annular cavity; 9. Combined stuffing box. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] In the description of the present application, it should be noted that the terms used here are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0050] Embodiment 1:

[0051] The embodiment of the present application provides an XN type bidirectional pressure metal sealing butterfly valve, comprising: a valve body 1, an end cover 2 is arranged at the bottom of the valve body 1, a bracket 3 and a worm gear head 4 are arranged at the top of the valve body 1; a butterfly plate 5, the butterfly plate 5 is arranged in the valve body 1; a valve body 1 integrated valve seat, the valve body 1 integrated valve seat is arranged in the valve body 1, and the valve body 1 integrated valve seat is processed by body surfacing positive cone; a valve stem 7, the valve stem 7 is arranged on the valve body 1 to drive the butterfly plate 5 to move, and the valve stem 7 is drivingly connected to the worm gear head 4;

[0052] It also includes: an energy storage type metal seal 8, which is arranged on the butterfly plate 5 and can cooperate with the valve seat of the valve body 1 to form a two-way seal;

[0053] The energy storage metal seal 8 is distributed on the edge of the butterfly plate 5 along the circumference of the butterfly plate 5 .

[0054] The butterfly plate 5 is a tortoise-back type butterfly plate 5.

[0055] In this embodiment, during the use of the XN type bidirectional pressure metal sealed butterfly valve, the movement of the butterfly plate 5 is controlled by the worm gear head 4 driving the valve stem 7 to move. When the butterfly plate 5 is closed, the energy storage metal seal 8 cooperates with the valve seat of the valve body 1 to form a bidirectional seal, which effectively improves the sealing effect of the butterfly valve, so that the XN type bidirectional pressure metal sealed butterfly valve can adapt to the use requirements of multiple fields. At the same time, the energy storage metal seal 8 has an energy storage effect, that is, when the energy storage metal seal 8 forms a sealing surface, the sealing surface can produce a tighter and tighter effect as the butterfly plate 5 is continuously closed, and when the valve is opened, the energy storage metal seal 8 can release energy, so that the energy storage metal seal 8 can be reset to the initial state, ensuring that the XN type bidirectional pressure metal sealed butterfly valve always has a good sealing effect during the frequent opening and closing process, reducing the failure of the sealing surface, and improving the sealing stability of the butterfly valve.

[0056] Embodiment 2:

[0057] The present embodiment provides an XN type bidirectional pressure metal sealing butterfly valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features: the energy storage metal seal 8 also includes: a sealing ring 80, which is in a "Γ" shape; a spiral wound gasket 81, which is a spiral wound gasket that is resistant to high temperature, low temperature and corrosion; an adjustable sealing type pressure ring 82, which can be fixedly installed on the butterfly plate 5 by means of a circumferential screw 83, and the adjustable sealing type pressure ring 82 has an outer circle of a pressure plate ring for supporting the lateral extension end of the "Γ" type sealing ring 80; an internal pressure cavity 84, which is located between the sealing ring 80 and the adjustable sealing type pressure ring 82; an energy storage ring 85, which is arranged in the internal pressure cavity 84 and can support the sealing ring 80 and enable the sealing ring 80 to achieve automatic reset and sealing compensation;

[0058] The sealing ring 80 is arranged along the circumference of the butterfly plate 5 , the spiral wound gasket 81 is arranged between the sealing ring 80 and the butterfly plate 5 , the sealing ring 80 is fixed on the butterfly plate 5 by adjusting the sealing pressure ring 82 , and the energy storage ring 85 is concentrically distributed with the sealing ring 80 .

[0059] In this embodiment, during the use of the XN type bidirectional pressure metal sealed butterfly valve, the movement of the butterfly plate 5 is controlled by the worm gear head 4 driving the valve stem 7 to move. When the butterfly plate 5 is closed, the sealing ring 80 cooperates with the valve seat connected to the valve body 1 to form a bidirectional seal, which effectively improves the sealing effect of the butterfly valve, so that the XN type bidirectional pressure metal sealed butterfly valve can adapt to the use requirements of multiple fields. At the same time, since the energy storage ring 85 supports the sealing ring 80, when the sealing ring 80 cooperates with the valve seat connected to the valve body 1 to form a sealing surface, the sealing surface can produce a tightening effect as the butterfly plate 5 is continuously closed, and when the valve is opened, the energy storage ring 85 can release the energy generated during the closing process of the butterfly plate 5, so that the sealing ring 80 can be reset to the initial state, ensuring that the XN type bidirectional pressure metal sealed butterfly valve always has a good sealing effect during the frequent opening and closing process, reducing the failure of the sealing surface, and improving the sealing stability of the butterfly valve.

[0060] Embodiment 3:

[0061] This embodiment provides an XN type bidirectional pressure metal sealing butterfly valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features: the energy storage ring 85 has an annular cavity 850 concentrically distributed with the energy storage ring 85 .

[0062] In this embodiment, the provision of an annular cavity 850 concentrically distributed with the energy storage ring 85 inside the energy storage ring 85 can further improve the energy storage effect of the energy storage ring 85, thereby further improving the effect of the sealing surface being tightened and the resetting effect of the sealing ring 80.

[0063] Embodiment 4:

[0064] This embodiment provides an XN type bidirectional pressure metal sealing butterfly valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features: the energy storage ring 85 is made of 17-7PH austenite-martensite precipitation hardening stainless steel.

[0065] In this embodiment, the energy storage ring 85 is made of 17-7PH austenite-martensite precipitation hardening stainless steel. By utilizing the good plasticity and processability of 17-7PH austenite-martensite precipitation hardening stainless steel, the performance of the energy storage ring 85 is improved.

[0066] Embodiment 5:

[0067] This embodiment provides an XN type bidirectional pressure metal sealing butterfly valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features: the energy storage ring 85 is made of Inconel X-750 nickel-based high-temperature alloy.

[0068] In this embodiment, the energy storage ring 85 is made of Inconel X-750 nickel-based high-temperature alloy. Inconel X-750 nickel-based high-temperature alloy has good corrosion resistance and oxidation resistance, good relaxation resistance, and good forming performance and welding performance, thereby effectively improving the energy storage effect and service life of the energy storage ring 85.

[0069] Embodiment 6:

[0070] This embodiment provides an XN type bidirectional pressure metal sealing butterfly valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features: the sealing ring 80 is a metal sealing ring 80, and the sealing ring 80 can be overlaid with STL Stellite alloy or spray-welded with WC tungsten carbide and nickel-based alloy.

[0071] In this embodiment, by surfacing STL Stellite alloy or spraying WC tungsten carbide and nickel-based alloy on the sealing ring 80, the resistance of the sealing ring 80 to erosion and corrosion under severe working conditions can be effectively improved.

[0072] Embodiment 7:

[0073] The present embodiment provides an XN type bidirectional pressure metal sealing butterfly valve, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features: a combined stuffing box 9 is arranged between the valve stem 7 and the valve body 1, and the combined stuffing box 9 can be a high-temperature combined stuffing box 9 or an ultra-low-temperature combined stuffing box 9 used alone, or a high-temperature combined stuffing box 9 and an ultra-low-temperature combined stuffing box 9 can be used together.

[0074] The high-temperature combined stuffing box 9 can be composed of a high-temperature steel base, a flexible graphite self-lubricating bearing, a chromium-nickel stainless steel stuffing pad, braided graphite and flexible graphite. The high-temperature combined stuffing box 9 can be tightly sealed by a stuffing gland pre-tightening device. The ultra-low-temperature combined stuffing box 9 can be pre-tightened by a combination of a disc spring and a disc spring pad, and tightly sealed by a graphite ring gasket and a stuffing gland.

[0075] In this embodiment, through the setting of the combined stuffing box 9, the high-temperature combined stuffing box 9 is suitable for high-temperature media and corrosive media, and the ultra-low-temperature combined stuffing box 9 is suitable for ultra-low-temperature media. By selecting the applicable high-temperature combined stuffing box 9 or the ultra-low-temperature combined stuffing box 9, the butterfly valve can be applied to different working conditions, thereby improving the versatility of the butterfly valve.

[0076] Embodiment 8:

[0077] This embodiment provides a method for using an XN type bidirectional pressure metal sealing butterfly valve. In addition to the technical solutions of the above embodiments, it also has the following technical features, including the following steps:

[0078] The S1 valve is closed. During the valve closing process, the valve stem 7 is driven to move by the worm gear head 4. The butterfly plate 5 cooperates with the valve seat connected to the valve body 1 as the valve stem 7 moves. At this time, the energy storage metal seal 8 forms a sealing surface with the valve seat connected to the valve body 1. At the same time, the energy storage ring 85 supports the sealing ring 80. The energy storage ring 85 and the sealing ring 80 work in combination. When the valve is closed, the sealing ring 80 is continuously pressed against the valve seat connected to the valve body 1 as the butterfly plate 5 is continuously closed;

[0079] S2 plate lifting compensation, when the medium in the valve body 1 reacts, the sealing ring 80 combines with the energy storage ring 85, and the sealing ring 80 can form automatic reset and plate lifting compensation under the support of the energy storage ring 85;

[0080] S3 valve is opened. During the valve opening process, the valve stem 7 is driven to move by the worm gear head 4. The butterfly plate 5 is released from the valve seat of the valve body 1 as the valve stem 7 moves. At the same time, under the action of the energy storage ring 85, the sealing ring 80 is reset to the initial state;

[0081] S4: disassembly of the energy storage ring 85. When there is no reverse force from the medium on the pipe network, the adjusting sealing type pressure ring 82 is disassembled, thereby disassembling the energy storage ring 85.

[0082] In this embodiment, when the XN type bidirectional pressure metal sealed butterfly valve is in use, the butterfly valve sealing pair is designed with a sealing ring 80 and an energy storage ring 85 in combination. When closing the valve, it can be closed tighter and tighter, and when opening the valve, it can be reset to the initial state under the action of the energy storage ring 85. It has a good sealing effect during frequent opening and closing. When the medium reacts, the sealing ring 80 can combine with the energy storage ring 85 to form a lifting plate compensation, realizing the radial dynamic balance principle, ensuring that the sealing requirements are met in both positive and negative directions, with superior performance and a wide range of applications. When there is no reverse force from the medium on the pipeline network, the adjustable sealing pressure ring 82 is disassembled, thereby disassembling the energy storage ring 85, which can completely replace the alternative product of the three-eccentric butterfly valve.

[0083] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. An XN type bidirectional pressure metal sealing butterfly valve, comprising: A valve body (1), wherein an end cover (2) is arranged at the bottom of the valve body (1), and a bracket (3) and a worm gear head (4) are arranged at the top of the valve body (1); A butterfly plate (5), wherein the butterfly plate (5) is arranged in the valve body (1); A valve body (1) integrated valve seat, wherein the valve body (1) integrated valve seat is arranged in the valve body (1), and the valve body (1) integrated valve seat is formed by welding the valve body with a positive cone; A valve stem (7), the valve stem (7) being arranged on the valve body (1) and used for driving the butterfly plate (5) to move, the valve stem (7) being drivingly connected to the worm gear head (4); It is characterized by further comprising: An energy storage type metal seal (8), wherein the energy storage type metal seal (8) is arranged on the butterfly plate (5) and can cooperate with the valve seat of the valve body (1) to form a bidirectional seal; Wherein, the energy storage type metal seal (8) is distributed on the edge of the butterfly plate (5) along the circumference of the butterfly plate (5).

2. According to claim 1, an XN type bidirectional pressure metal sealing butterfly valve is characterized in that: The energy storage type metal seal (8) further comprises: A sealing ring (80), wherein the sealing ring (80) is in a "Γ" shape; A wound gasket (81), wherein the wound gasket (81) is a wound gasket that is resistant to high temperatures, low temperatures and corrosion; An adjustable sealing type pressure ring (82), wherein the adjustable sealing type pressure ring (82) can be fixedly mounted on the butterfly plate (5) by means of a circumferential screw (83), and the adjustable sealing type pressure ring (82) has an outer circle of a pressure plate ring for supporting a transversely extending end of a "Γ"-shaped sealing ring (80); An internal pressure cavity (84), wherein the internal pressure cavity (84) is located between the sealing ring (80) and the regulating sealing type pressure ring (82); An energy storage ring (85), wherein the energy storage ring (85) is arranged in the internal pressure cavity (84) and can support the sealing ring (80) and enable the sealing ring (80) to achieve automatic reset and sealing compensation; The sealing ring (80) is arranged along the circumference of the butterfly plate (5), the spiral wound gasket (81) is arranged between the sealing ring (80) and the butterfly plate (5), the sealing ring (80) is fixed on the butterfly plate (5) by adjusting the sealing pressure ring (82), and the energy storage ring (85) is concentrically distributed with the sealing ring (80).

3. According to claim 2, an XN type bidirectional pressure metal sealing butterfly valve is characterized in that: The energy storage ring (85) has an annular cavity (850) disposed concentrically with the energy storage ring (85).

4. According to claim 2, an XN type bidirectional pressure metal sealing butterfly valve is characterized in that: The energy storage ring (85) is made of 17-7PH austenite-martensite precipitation hardening stainless steel.

5. According to claim 2, an XN type bidirectional pressure metal sealing butterfly valve is characterized in that: The energy storage ring (85) is made of InconelX-750 nickel-based high-temperature alloy.

6. According to claim 5, an XN type bidirectional pressure metal sealing butterfly valve is characterized in that: The sealing ring (80) is a metal sealing ring (80), and the sealing ring (80) can be built-up welded with STL Stellite alloy or spray-welded with WC tungsten carbide and nickel-based alloy.

7. The XN type bidirectional pressure metal sealing butterfly valve according to claim 1 is characterized in that: The butterfly plate (5) is a tortoise-back-shaped butterfly plate (5).

8. The XN type bidirectional pressure metal sealing butterfly valve according to claim 1 is characterized in that: A combined stuffing box (9) is arranged between the valve stem (7) and the valve body (1). The combined stuffing box (9) can be a high-temperature combined stuffing box (9) or an ultra-low-temperature combined stuffing box (9) used alone, or a high-temperature combined stuffing box (9) and an ultra-low-temperature combined stuffing box (9) used together.

9. The XN type bidirectional pressure metal sealing butterfly valve according to claim 8, characterized in that: The high-temperature combined stuffing box (9) can be composed of a high-temperature steel base, a flexible graphite self-lubricating bearing, a chrome-nickel stainless steel stuffing pad, braided graphite and flexible graphite. The high-temperature combined stuffing box (9) can be tightened and sealed by a packing gland pre-tightening device. The ultra-low-temperature combined stuffing box (9) can be pre-tightened by a combination of a disc spring and a disc spring pad, and tightened and sealed by a graphite ring gasket and a packing gland.

10. A method for using the XN type bidirectional pressure metal sealing butterfly valve according to claim 3, characterized in that: The following steps are involved: The S1 valve is closed. During the valve closing process, the valve stem (7) is driven to move by the worm gear head (4). The butterfly plate (5) cooperates with the valve seat connected to the valve body (1) as the valve stem (7) moves. At this time, a sealing surface is formed between the energy storage metal seal (8) and the valve seat connected to the valve body (1). At the same time, the energy storage ring (85) supports the sealing ring (80). The energy storage ring (85) and the sealing ring (80) work in combination. When the valve is closed, the sealing ring (80) is continuously pressed against the valve seat connected to the valve body (1) as the butterfly plate (5) is continuously closed. S2 plate lifting compensation, when the medium in the valve body (1) reacts, the sealing ring (80) combines with the energy storage ring (85), and the sealing ring (80) can form automatic reset and plate lifting compensation under the support of the energy storage ring (85); The S3 valve is opened. During the valve opening process, the valve stem (7) is driven to move by the worm gear head (4), and the butterfly plate (5) is released from the valve seat connected to the valve body (1) as the valve stem (7) moves. At the same time, under the action of the energy storage ring (85), the sealing ring (80) is reset to the initial state; S4: disassembly of the energy storage ring (85). When there is no reverse force from the medium on the pipe network, the regulating seal type pressure ring (82) is disassembled, thereby disassembling the energy storage ring (85).

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