Inverted metal sealing ball valve

Abstract

The utility model relates to an inverted metal sealing ball valve, which relates to the technical field of ball valve sealing, and comprises a valve body, a self-sealing end cover, a main valve seat, a main valve seat and a sealing cover, the bottom of the valve body is provided with a mounting port for mounting an integrated ball rod, the self-sealing end cover is used for sealing the mounting port, and the main valve seat is in sealing fit with the integrated ball rod; one end of the self-sealing end cover is in sealing fit with the main valve seat, the other end of the self-sealing end cover is in sealing fit with the auxiliary valve seat far away from the integrated ball rod, and a first disc spring is arranged at the contact position of the self-sealing end cover and the integrated ball rod. The integrated ball rod is arranged, so that the situation that a valve rod and a ball body of a traditional ball valve are not suitable for high-frequency operation occasions due to the fact that a flat tenon or square tenon connecting structure is adopted is avoided; by means of the valve, the reliability of opening or closing of the valve is guaranteed, and the sealing effect can be improved by arranging the first disc spring.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of ball valve sealing, especially relates to a reverse mounting type metal sealing ball valve. BACKGROUND

[0002] Ball valve is a new type of valve appeared in the 1950s. In the past few decades, ball valve has developed into a major valve. Because of its simple structure, small size, light weight, strong sealing performance, small installation space, low cost and other advantages, the application of ball valve in various fields has developed rapidly. Especially in developed industrial countries such as the United States, Germany and France, the application range of ball valve is more extensive, and its technology is continuously upgraded, the demand is further expanded, and it develops towards the use direction of harsh working conditions such as high temperature, high pressure, large diameter and wear resistance. The reliability and performance index of its products have reached the advanced level, and it has gradually replaced part of the gate valve, stop valve and throttle valve, and has been widely used in many aspects such as coal chemical industry, petroleum chemical industry, aerospace, housing construction and long-distance pipeline.

[0003] It is generally believed that ball valve is the most suitable for use as a shut-off valve. With the development in recent years, ball valve has been designed as a regulating valve with throttling and flow control, and its application is more extensive. The existing metal sealing ball valve is classified according to the way of assembling the ball, which is divided into side-mounted type, top-mounted type and reverse-mounted type. The valve body and cover of side-mounted type ball valve and top-mounted type ball valve are sealed by winding gasket or metal gasket ring. The side-mounted type metal sealing ball valve cannot realize online maintenance. Although the top-mounted type metal sealing ball valve realizes the function of online disassembly, the existing top-mounted type metal sealing structure is complex, and special tool is needed to disassemble the ball and valve seat, and it is difficult to clean the impurities deposited at the bottom of the valve body, so the online maintenance is poor. The ball and valve stem of the existing reverse-mounted type metal sealing ball valve are connected by tenon or square tenon. In high-frequency operation occasions, the connecting surface of the valve stem and the ball is easy to deform due to fatigue stress, which leads to the valve opening or closing not in place, and the sealing effect is poor.

[0004] Therefore, aiming at the above technical problems, the reverse-mounted type metal sealing ball valve is designed to avoid the problem that the ball and the valve stem are connected by tenon or square tenon, and the connecting surface of the valve stem and the ball is easy to deform due to fatigue stress in high-frequency operation occasions, so as to ensure that the valve opens or closes in place, and the sealing effect can be improved. It is a technical problem to be solved by those skilled in the art. CONTENT OF THE UTILITY MODEL

[0005] In order to solve the above problems, the utility model provides a reverse-mounted type metal sealing ball valve, which avoids the problem that the ball and the valve stem are connected by tenon or square tenon, and the connecting surface of the valve stem and the ball is easy to deform due to fatigue stress in high-frequency operation occasions, so as to ensure that the valve opens or closes in place, and the sealing effect can be improved.

[0006] In order to achieve the above object, the utility model provides the following scheme:

[0007] A kind of inverted metal seal ball valve, including the valve body of bottom being equipped with the installation port of integrated ball stem for installing, the self-sealing end cover for blocking the installation port, with the main valve seat of integrated ball stem sealing cooperation, and one end with the valve body inner wall sealing cooperation, the other end with the main valve seat away from the integrated ball stem sealing cooperation of vice valve seat, the contact part of the self-sealing end cover with the integrated ball stem is provided with first disc spring.

[0008] Preferably, the integrated ball stem includes valve stem, ball connected with the valve stem end, and trunnion connected with the ball and matched with the self-sealing end cover, the first disc spring is arranged between the trunnion and the self-sealing end cover, and the ball is provided with spherical sealing surface sealing against the main valve seat.

[0009] Preferably, the end surface of the flow channel on the ball is bevel, and the diameter of the ball near one end of the trunnion is greater than the diameter of the ball near one end of the valve stem.

[0010] Preferably, the valve body includes vice valve seat hole matched with the vice valve seat, anti-flying shoulder matched with the ball arranged above the vice valve seat hole, bearing hole for installing sliding bearing arranged above the anti-flying shoulder, stuffing box arranged at the top end of the valve body, and screw hole matched and connected with stud arranged on the top surface of the valve body and stuffing gland.

[0011] Preferably, the main valve seat is provided with sealing spherical surface matched with the spherical sealing surface, and main valve seat sealing surface abutting matched with the vice valve seat.

[0012] Preferably, the sliding bearing matched with the valve stem is arranged in the bearing hole.

[0013] Preferably, the gasket ring, second packing and packing pad are sequentially arranged in the stuffing box from top to bottom.

[0014] Preferably, the self-sealing end cover is connected with restraining ring through screw, and the self-sealing ring, pressing plate and four-opening ring are sequentially arranged between the self-sealing end cover and the restraining ring from top to bottom.

[0015] Preferably, the vice valve seat includes vice valve seat sealing surface matched with the main valve seat sealing surface, and vice valve seat shaft arranged on the circumference of the main valve seat away from the vice valve seat sealing surface, and the sealing element is arranged on the vice valve seat shaft.

[0016] Preferably, the seal comprises a first packing, a compression ring and a second disc spring for ensuring the sealing of the auxiliary valve seat and the valve body and the main valve seat, the first packing, the compression ring and the second disc spring are arranged in sequence from the end close to the main valve seat to the end away from the main valve seat.

[0017] The utility model discloses relative to prior art has obtained following technical effect:

[0018] By setting integral type ball stem, avoid the traditional ball valve's valve stem and ball body because adopt tenon or square tenon connection structure and can not be applicable to high frequency operation occasion, and can not be applicable to the problem (because in high frequency operation and fast closing occasion, the tenon or square tenon of ball body and valve stem's opposite side causes fatigue damage to its matching surface due to low cycle fatigue or impact force, light causes the valve to open or close not in place, heavy causes the valve to be unable to operate) of square tenon, to guarantee the reliability of valve opening or closing, and by setting first disc spring can also provide axial initial sealing pre-tightening force for integral type ball stem and main valve seat's sealing, first disc spring also indirectly provides sealing force for the auxiliary valve seat sealing of main valve seat and auxiliary valve seat, and further improves the sealing effect. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the utility model or prior art, the following will briefly introduce the drawings needed to be used in the embodiment, obviously, the drawings in the following description only some embodiments of the utility model, for those skilled in the art, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings.

[0020] ATTACHMENT Figure 1 It is the overall structure schematic diagram of flip type metal seal ball valve disclosed by the embodiment of the utility model;

[0021] ATTACHMENT Figure 2 It is the self-sealing end cover structure schematic diagram of flip type metal seal ball valve disclosed by the embodiment of the utility model;

[0022] ATTACHMENT Figure 3 It is the valve body structure schematic diagram of flip type metal seal ball valve disclosed by the embodiment of the utility model;

[0023] ATTACHMENT Figure 4 It is the auxiliary valve seat structure schematic diagram of flip type metal seal ball valve disclosed by the embodiment of the utility model;

[0024] ATTACHMENT Figure 5 It is the main valve seat structure schematic diagram of flip type metal seal ball valve disclosed by the embodiment of the utility model;

[0025] ATTACHMENT Figure 6The utility model discloses an inverted metal seal ball valve integrated ball rod structure schematic diagram.

[0026] Among them, 1, screw; 2, hold ring; 3, four open ring; 4, press plate; 5, self sealing ring; 6, self sealing end cover; 7, valve body; 8, second disc spring; 9, press ring; 10, first packing; 11, vice valve seat; 12, main valve seat; 13, sliding bearing; 14, integrated ball rod; 15, packing gasket; 16, second packing; 17, gasket ring; 18, nut; 19, packing cover; 20, stud; 21, first disc spring; 22, screw hole; 23, trunnion hole; 24, trunnion hole bottom surface; 25, bearing hole; 26, anti -flying shoulder; 27, vice valve seat hole; 28, vice valve seat axle; 29, vice valve seat sealing surface; 30, main valve seat sealing surface; 31, sealed spherical surface; 32, spherical sealing surface; 33, trunnion; 34, valve rod; 35, ball; 36, packing box; 37, screw hole. DETAILED DESCRIPTION

[0027] The technical scheme in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the utility model.

[0028] The utility model discloses an inverted metal seal ball valve, avoid the ball and valve rod because adopt the tenon or square tenon connection in high frequency operation occasion valve rod and ball connection surface easily because of fatigue stress and deformation problem, thereby guarantee valve door opening or closed to the place, and can improve sealing effect.

[0029] In order to make the above-mentioned purpose, features and advantages of the utility model more obvious and easy to understand, the utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0030] Reference Figures 1-6The utility model discloses a flip type metal seal ball valve, at least comprising valve body 7, the bottom of valve body 7 is provided with the installation mouth, through the installation mouth, integral ball rod 14 is arranged from the bottom to the inside of valve body 7, the bottom of installation mouth is provided with the self -sealing end cap 6 for plugging installation mouth, the inside of valve body 7 is provided with the main valve seat 12 of sealing cooperation with integral ball rod 14, the inner wall of valve body 7 is provided with vice valve seat 11 between main valve seat 12, vice valve seat 11 one end is abutted with the inner wall of valve body 7 to realize sealing, the other end is abutted with main valve seat 12 to realize sealing, the contact part of self -sealing end cap 6 and integral ball rod 14 is provided with first disc spring 21, through setting integral ball rod 14, avoid the problem that the valve stem 34 and ball body 35 of traditional ball valve because adopt tenon or square tenon connecting structure and can not be applicable to high frequency operation occasion and can not be applicable to quick opening and closing (such as 0.5 seconds) operation occasion (because in high frequency operation and quick closing occasion, the opposite side of tenon or square tenon of ball body 35 and valve stem 34 is caused fatigue damage to its matching surface because of low cycle fatigue or impact force, light causes valve opening or closing to be not in place, heavy causes valve to be unable to operate), to guarantee the reliability of valve opening or closing, and through setting first disc spring 21 can also provide axial initial sealing pre-tightening force for the sealing of integral ball rod 14 and main valve seat 12, first disc spring 21 also indirectly provides sealing force for the vice valve seat sealing of main valve seat 12 and vice valve seat 11, and further improves sealing effect.

[0031] Reference Figure 6 As an embodiment, the integral ball rod 14 includes a valve stem 34, a ball body 35 connected to an end of the valve stem 34, and a trunnion 33 connected to the ball body 35 and cooperating with the self-sealing end cap 6. The first disc spring 21 is arranged between the trunnion 33 and the self-sealing end cap 6. The ball body 35 is provided with a spherical sealing surface 32 that sealingly abuts against the main valve seat 12. The self-sealing end cap 6 is provided with a trunnion hole 23 that cooperates with the trunnion 33. The trunnion 33 is used to cooperate with and guide the trunnion hole 23 of the self-sealing end cap 6, thereby fixing the integral ball rod 14. The valve stem 34 is used to operate the valve, thereby opening and closing the valve. The spherical sealing surface 32 and the main valve seat 12 form a sealing pair of the ball valve, thereby realizing the sealing function of the ball valve.

[0032] Reference Figure 6, as an embodiment, the end face of the flow channel on the ball 35 is inclined, the diameter of the ball 35 near the trunnion 33 is larger than the diameter of the ball 35 near the valve stem 34, and the two ends of the flow channel of the ball 35 are no longer parallel to each other and perpendicular to the axis of the ball 35 passage, but form a certain angle along the axis of the ball 35 passage, and the two ends of the flow channel of the ball 35 are inclined planes to realize the assembly function of the integrated ball stem 14 into the valve body 7 from the lower end of the valve body 7. The inclined surface of the two ends of the flow channel of the ball 35 can ensure that the size of the upper end of the ball 35 is small and the size of the lower end is large, and also realizes the anti-ejection function of the valve stem 34, so that the integrated ball stem 14 cannot pass through the anti-ejection shoulder 26 of the valve body 7, ensuring the safety of the valve.

[0033] Reference Figure 2 , as an embodiment, the valve body 7 comprises a secondary valve seat hole 27 matched with the secondary valve seat 11, an anti-ejection shoulder 26 arranged above the secondary valve seat hole 27 and matched with the ball 35, a bearing hole 25 arranged above the anti-ejection shoulder 26 for installing the sliding bearing 13, a stuffing box 36 arranged at the top end of the valve body 7, and a threaded hole 37 arranged on the top surface of the valve body 7 and matched with the stud 20 on the packing gland 19. The valve body 7 is provided with the bearing hole 25 for installing the sliding bearing 13, and the sliding bearing 13 and the bearing hole 25 are in interference fit. The sliding bearing 13 provides guiding and supporting functions for the valve stem 34 of the integrated ball stem 14. The valve body 7 is provided with the anti-ejection shoulder 26 for preventing the integrated ball stem 14 from being ejected out of the pressure boundary of the valve body 7 under the action of medium pressure, thereby avoiding safety accidents. The valve body 7 is provided with the secondary valve seat hole 27 for installing the secondary valve seat assembly.

[0034] Reference Figure 6 , as an embodiment, the main valve seat 12 is provided with a sealing spherical surface 31 matched with the spherical sealing surface 32 of the ball 35, and a main valve seat sealing surface 30 abutting against the secondary valve seat 11. The sealing spherical surface 31 and the spherical sealing surface 32 of the ball 35 constitute a sealing pair of the ball valve, realizing the sealing function of the ball valve. The main valve seat 12 is provided with the main valve seat sealing surface 30, which is an inclined plane and constitutes a sealing pair with the secondary valve seat sealing surface 29 of the secondary valve seat 11. The sealing pair is a wedge-tight sealing, which has good sealing effect under high temperature and high pressure.

[0035] Reference Figure 1 , as an embodiment, the sliding bearing 13 matched with the valve stem 34 is arranged in the bearing hole 25.

[0036] Reference Figure 1 , as an embodiment, the gasket ring 17, the second packing 16 and the packing gasket 15 are sequentially arranged in the stuffing box 36 from top to bottom, so as to realize the sealing between the secondary valve seat 11 and the secondary valve seat hole 27 of the valve body 7.

[0037] Reference Figure 1As an embodiment, the self-sealing end cover 6 is connected with the restraining ring 2 through the screw 1, the self-sealing ring 5, the pressing plate 4 and the four-opening ring 3 are sequentially arranged between the self-sealing end cover 6 and the restraining ring 2 from top to bottom, the self-sealing ring 5, the pressing plate 4 and the four-opening ring 3 can realize the sealing between the self-sealing end cover 6 and the valve body 7, the self-sealing end cover 6 is provided with the threaded hole 22 for fastening the screw 1 on the top of the restraining ring 2, and the self-sealing ring 5 is provided with a pre-tightening force to realize the initial sealing of the self-sealing ring 5.

[0038] It should be noted that the self-sealing end cover 6 is provided with a shaft shoulder for accommodating the self-sealing ring 5, the pressing plate 4 and the four-opening ring 3.

[0039] Reference Figure 4 As an embodiment, the auxiliary valve seat 11 includes the auxiliary valve seat sealing surface 29 matched with the main valve seat sealing surface 30, and the auxiliary valve seat shaft 28 arranged on the circumference of the end of the main valve seat 12 away from the auxiliary valve seat sealing surface 29, the auxiliary valve seat shaft 28 is provided with a sealing element, the auxiliary valve seat 11 is provided with the auxiliary valve seat sealing surface 29, the sealing surface is an inclined plane, and the main valve seat sealing surface 30 of the main valve seat 12 forms a sealing pair, the sealing pair is a wedge-shaped sealing, which can ensure the sealing effect under high temperature and high pressure.

[0040] Reference Figure 4 As an embodiment, the sealing element includes the first packing 10, the pressing ring 9 and the second disc spring 8 for ensuring the sealing between the auxiliary valve seat 11 and the valve body 7 and the main valve seat 12, the first packing 10, the pressing ring 9 and the second disc spring 8 are sequentially arranged from the end close to the main valve seat 12 to the end away from the main valve seat 12, the first packing 10 realizes the radial sealing between the auxiliary valve seat shaft 28 of the auxiliary valve seat 11 and the auxiliary valve seat hole 27 of the valve body 7, the pressing ring 9 is used for pressing the first packing 10, and the second disc spring 8 is used for providing the first packing 10 with a pre-tightening force for initial sealing, there is a gap between the radial direction of the auxiliary valve seat 11 and the auxiliary valve seat hole 27 of the valve body 7, the auxiliary valve seat 11 can freely slide in the auxiliary valve seat hole 27 of the valve body 7 when the integrated ball lever 14 and the main valve seat 12 are expanded by heat, the second disc spring 8 is compressed and deformed, the second disc spring 8 absorbs the temperature stress of the integrated ball lever 14, the main valve seat 12 and the auxiliary valve seat 11, and ensures that the integrated ball lever 14 will not be stuck and cannot be actuated.

[0041] The self-sealing end cover 6 is provided with the trunnion hole bottom surface 24 for installing the first disc spring 21, the first disc spring 21 provides the axial initial sealing pre-tightening force for the spherical sealing surface 32 of the integrated ball lever 14 and the sealing spherical surface 31 of the main valve seat 12, and the first disc spring 21 also indirectly provides the sealing force for the main valve seat sealing surface 30 of the main valve seat 12 and the auxiliary valve seat sealing surface 29 of the auxiliary valve seat 11.

[0042] The utility model discloses, valve assembly, the sliding bearing 13 is pressed into the bearing hole 25 on valve body 7, then first packing 10, compression ring 9, second disc spring 8 are loaded into the vice valve seat axle 28 of vice valve seat 11 in proper order, again, vice valve seat assembly is loaded into the vice valve seat hole 27 of valve body 7, and the assembly of vice valve seat is completed, the valve stem 34 of integrated ball lever 14 is worn into the axle hole of sliding bearing 13, when the ball body 35 of integrated ball lever 14 has not entered the valve cavity of valve body 7, the sealing spherical surface 32 of integrated ball lever 14 is adhered on the sealing spherical surface 31 of main valve seat 12, then integrated ball lever 14 assembly is pushed into the valve cavity of valve body 7, and the main valve seat sealing surface 30 of main valve seat 12 and the vice valve seat sealing surface 29 of vice valve seat 11 are kiss, and the assembly of integrated ball lever 14 is completed, and self-sealing end cover 6 is loaded into the valve cavity of valve body 7, and then self-sealing ring 5, pressing plate 4, four open ring 3 are loaded into the ring gap of valve body 7 and self-sealing end cover 6 in proper order, then loading in the restraint ring 2 and the screw 1 is rotated into the screw hole 22 of self-sealing end cover 6, and the screw 1 is fastened, and the assembly of self-sealing end cover 6 is completed, and packing 15, second packing 16, gasket ring 17 are loaded into the packing box 36 of valve body 7 in proper order, and packing gland 19 is loaded, and stud 20 is rotated into the screw hole 37 of valve body 7, and then nut 18 is rotated into stud 20 and is fastened, and the assembly of packing is completed, and the whole valve assembly is completed, and vice versa operation, then is disassembled valve.

[0043] Through the above setting, the beneficial effects of the utility model are:

[0044] (1) by setting the inverted metal ball valve, compared with the traditional side-mounted metal sealed ball valve, realizes the valve on-line detachability, solves compared with the traditional upper-mounted metal sealed ball valve, completely realizes the on-line maintainability.

[0045] (2) by setting self-sealing end cover 6 and packing gland 19, compared with the traditional metal sealed ball valve, the flange joint sealing between metal sealed ball valve body 7 and valve cover is solved, and the flange joint is prone to leakage under high temperature and high pressure alternating conditions due to the combined stress of pipeline.

[0046] (3) by setting integrated ball lever 14, compared with the traditional metal sealed ball valve, the ball body 35 and the valve stem 34 are connected in high-frequency operation, and the connection surface of the valve stem 34 and the ball body 35 is prone to deformation due to fatigue stress, especially the valve opening or closing problem is solved.

[0047] (4) by setting integrated ball lever 14, compared with the traditional metal sealed ball valve, the existing metal sealed ball valve is solved due to the multiple components, the structure is complex, and the valve is prone to jamming under high temperature due to temperature stress, especially the valve cannot be normally opened or closed.

[0048] (5) By setting the inverted metal ball valve, compared with the traditional metal sealed ball valve, the existing metal sealed ball valve is applied to solid particle working condition (such as polycrystalline silicon) or solid-liquid two-phase flow working condition (coal chemical black water or grey water), and it is difficult to clean the valve cavity due to the deposition of solid scale in the valve cavity bottom, so as to affect the valve opening and closing problem.

[0049] (6) By setting the first disc spring 21 and the second disc spring 8, compared with the traditional metal sealed ball valve, the existing metal sealed ball valve is applied to the pressure-bearing shell affected by the assembly stress between the valve body 7 and the valve cover, so as to cause the valve sealing property to be reduced and the operation torque to be increased.

[0050] According to the actual demand, the adaptive change is within the protection scope of the utility model.

[0051] It should be noted that for those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the utility model is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. An inverted metal-sealed ball valve, characterized in that, The device includes a valve body with a bottom opening for mounting an integrated cue stick, a self-sealing end cap for sealing the mounting opening, a main valve seat that seals with the integrated cue stick, and a secondary valve seat with one end sealing with the inner wall of the valve body and the other end sealing with the main valve seat away from the integrated cue stick. A first disc spring is provided at the contact point between the self-sealing end cap and the integrated cue stick.

2. The inverted metal-sealed ball valve according to claim 1, characterized in that, The integrated ball joint includes a valve stem, a ball connected to the end of the valve stem, and a trunnion connected to the ball and cooperating with the self-sealing end cap. The first disc spring is disposed between the trunnion and the self-sealing end cap. The ball is provided with a spherical sealing surface that seals against the main valve seat.

3. The inverted metal-sealed ball valve according to claim 2, characterized in that, The end face of the flow channel on the sphere is inclined, and the diameter of the end of the sphere near the trunnion is larger than the diameter of the end of the sphere near the valve stem.

4. The inverted metal-sealed ball valve according to claim 2, characterized in that, The valve body includes a secondary valve seat hole that mates with the secondary valve seat, an anti-flyout shoulder that mates with the ball and is located above the secondary valve seat hole, a bearing hole for installing a sliding bearing located above the anti-flyout shoulder, a stuffing box located at the top of the valve body, and a threaded hole located on the top surface of the valve body that mates with a stud on the stuffing gland.

5. The inverted metal-sealed ball valve according to claim 4, characterized in that, The main valve seat is provided with a sealing spherical surface that mates with the spherical sealing surface, and a main valve seat sealing surface that abuts against the auxiliary valve seat.

6. The inverted metal-sealed ball valve according to claim 4, characterized in that, A sliding bearing that mates with the valve stem is provided inside the bearing hole.

7. The inverted metal-sealed ball valve according to claim 4, characterized in that, The stuffing box contains, from top to bottom, a gasket ring, a second packing, and a packing pad.

8. The inverted metal-sealed ball valve according to claim 4, characterized in that, A restraining ring is connected to the self-sealing end cap by screws. From top to bottom, a self-sealing ring, a pressure plate, and a four-opening ring are arranged between the restraining ring and the self-sealing end cap.

9. The inverted metal-sealed ball valve according to claim 5, characterized in that, The secondary valve seat includes a secondary valve seat sealing surface that mates with the sealing surface of the main valve seat, and a secondary valve seat shaft disposed circumferentially at one end of the main valve seat away from the secondary valve seat sealing surface, wherein a sealing element is disposed on the secondary valve seat shaft.

10. The inverted metal-sealed ball valve according to claim 9, characterized in that, The sealing element includes a first packing, a pressure ring, and a second disc spring for ensuring a seal between the secondary valve seat and the valve body and the main valve seat. The first packing, the pressure ring, and the second disc spring are arranged sequentially towards the end closer to the main valve seat and towards the end farther from the main valve seat.

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