Frictionless opening and closing hard-sealed ball valve

Abstract

The present application discloses a frictionless opening and closing hard-sealed ball valve. The inner elastic ring is installed on the large step of the valve seat head and forms a socket joint with the fixed ring groove on the hard-sealed sleeve. The outer elastic ring is installed on the small step and abuts against one end of the hard-sealed sleeve away from the ball. Release parts and pressing parts are arranged on the ball. For the frictionless opening and closing hard-sealed ball valve provided by the present invention, when the ball rotates to the closed or open angle, the release parts do not contact the inner elastic ring, and the elastic force of the inner elastic ring acts completely on the hard-sealed sleeve, and a strong combination is formed between the upper hard-sealed sleeve and the ball to form an excellent sealing effect. When the ball rotates to a partially open angle, the pressing parts move to the central position of the valve body and press the inner elastic ring. At this time, the elastic force of the inner elastic ring acts partially or does not act on the hard-sealed sleeve at all. The sealing force between the hard-sealed sleeve and the ball is provided by the outer elastic ring. While ensuring a certain contact sealing effect, the frictional resistance received by the rotation of the ball is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the field of hard-sealed ball valves, and particularly to a hard-sealed ball valve with frictionless opening and closing. Background Art

[0002] In the prior art, hard-sealed ball valves are used as valves in pipeline systems. Their characteristic is to control the on-off of fluid by the rotation of the ball. The so-called "hard seal" means that the sealing surface of the ball valve adopts hard materials, such as the metal-to-metal sealing method. This sealing method can form a very tight contact when closed, thus achieving a good sealing effect. Hard-sealed ball valves are suitable for occasions with high temperature, high pressure and some corrosive media because they have good pressure resistance, temperature resistance and corrosion resistance characteristics.

[0003] Since the seal of the hard-sealed ball valve is made of hard materials, the resistance of the whole valve during operation is relatively large, especially in the use environment with high sealing requirements. Reducing the bonding force between the hard seal ring and the ball may result in poor sealing effect of the whole ball valve during the working process; on the contrary, increasing the bonding force between the hard seal ring and the ball requires a higher driving force for the whole ball valve during the working process, and it is easy to cause unnecessary wear. Summary of the Invention

[0004] The main object of the present invention is to provide a hard-sealed ball valve with frictionless opening and closing, aiming to solve the problem that the friction of the hard-sealed ball valve cannot meet the requirements in various use states.

[0005] To achieve the above object, the present invention provides a hard-sealed ball valve with frictionless opening and closing, including:

[0006] A cylindrical valve body, on the outer wall of which a valve stem seat and a bottom cover seat are provided;

[0007] A ball, arranged in the valve body and having a flow channel passing through it. An upper groove and a lower groove are respectively arranged at the upper end and the lower end of the ball;

[0008] A valve stem, extending into the valve stem seat and forming a fit with the upper groove;

[0009] Two valve seat heads, connected to both ends of the valve body. An annular installation step is arranged at the inner end of the valve seat head. The installation step includes a large step and a small step with a reduced diameter from the inside to the outside in terms of thickness;

[0010] A hard seal sleeve, which is cylindrical and installed on the installation step. One end of the hard seal sleeve close to the ball forms a seal with the ball, and an annular fixed ring groove is arranged on the outer peripheral wall;

[0011] An inner elastic ring, the outer end in the length direction of which is installed on the large step. The inner end in the length direction of the inner elastic ring abuts against the fixed ring groove and forms a clearance fit in the length direction of the hard seal sleeve;

[0012] An outer elastic ring is installed on the small step and abuts against one end of the hard seal sleeve away from the sphere.

[0013] A bottom cover is installed on the bottom cover seat and forms a fit with the lower groove.

[0014] Wherein, a working part is respectively arranged on the upper and lower parts of the sphere. The working part is evenly spaced with release parts in the circumferential direction. A pressing part is arranged between two release parts on the working part. When the sphere is in a closed and fully conducting state, the release parts are transferred to the central position of the valve body and are in clearance fit with the inner elastic ring, and when the pressing part is transferred to the central position of the valve body, it presses the inner elastic ring.

[0015] Further, the inner wall of the valve body is cylindrical and has a groove structure corresponding to the pressing part on the sphere.

[0016] Further, the groove structure is arranged through the length direction of the valve body.

[0017] Further, the working part is integrally in a disc shape. Wherein, in the circumferential direction of the working part, the release part is an inward concave notch, and the pressing part is an outward convex arc lobe.

[0018] Further, a gland is also installed on the valve stem seat and penetrates into the valve body to clamp the sphere with the bottom cover.

[0019] Further, the inner elastic ring is a connecting structure in the circumferential direction. The overall shape of the inner elastic ring is in a frustum shape and the bottom end corresponds to the large step.

[0020] Further, a ring cavity is formed between the outer end in the length direction of the hard seal sleeve and the inner wall of the valve seat head. An auxiliary sealing ring is arranged in the ring cavity. A part of the outer elastic ring extends into the ring cavity to clamp the auxiliary sealing ring with the hard seal sleeve.

[0021] Further, the pressing part and the sphere are of an integral structure.

[0022] Further, the pressing part is clamped, pinned or threadedly connected to the sphere.

[0023] Further, the inner elastic ring and the outer elastic ring are disc springs.

[0024] The frictionless opening and closing hard-sealed ball valve provided by the present invention has an inner elastic ring installed on the large step of the valve seat head and sleeved with the fixed ring groove on the hard-sealed sleeve, and an outer elastic ring installed on the small step and abutted against one end of the hard-sealed sleeve away from the ball. The ball is provided with a release part and a pressing part. When the ball rotates to the closed or open angle, the release part does not contact the inner elastic ring, and the elastic force of the inner elastic ring acts completely on the hard-sealed sleeve, and a strong combination is formed between the hard-sealed sleeve and the ball to form an excellent sealing effect. When the ball rotates to a partially open angle, the pressing part moves to the central position of the valve body and presses the inner elastic ring. At this time, the elastic force of the inner elastic ring acts partially or does not act on the hard-sealed sleeve at all, and the sealing force between the hard-sealed sleeve and the ball is provided by the outer elastic ring. While ensuring a certain contact sealing effect, the frictional resistance suffered by the rotation of the ball is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the frictionless opening and closing hard-sealed ball valve according to the first embodiment of the present invention;

[0026] Figure 2 is a schematic diagram of the ball in the frictionless opening and closing hard-sealed ball valve according to the first embodiment of the present invention;

[0027] Figure 3 is a schematic diagram of the valve body in the frictionless opening and closing hard-sealed ball valve according to the first embodiment of the present invention;

[0028] Figure 4 is a schematic cross-sectional view of the frictionless opening and closing hard-sealed ball valve according to the first embodiment of the present invention (the inner elastic ring is compressed by the pressing part);

[0029] Figure 5 is a schematic cross-sectional view of the frictionless opening and closing hard-sealed ball valve according to the first embodiment of the present invention (the valve body is hidden and the inner elastic ring is compressed by the pressing part);

[0030] Figure 6 is Figure 5 the partial enlarged view in;

[0031] Figure 7 is a schematic cross-sectional view of the frictionless opening and closing hard-sealed ball valve according to the first embodiment of the present invention (the valve body is hidden and the inner elastic ring is released by the release part);

[0032] Figure 8 is Figure 7 the partial enlarged view in;

[0033] Figure 9 is a schematic diagram of the ball in the frictionless opening and closing hard-sealed ball valve according to the second embodiment of the present invention.

[0034] Reference Signs:

[0035] 100 - Valve body, 110 - Valve stem seat, 120 - Bottom cover seat, 130 - Groove structure, 200 - Sphere, 210 - Flow channel, 220 - Upper groove, 230 - Lower groove, 240 - Acting part, 241 - Compression part, 242 - Release part, 300 - Valve seat head, 310 - Large step, 320 - Small step, 330 - Annular cavity, 400 - Hard seal sleeve, 410 - Fixed ring groove, 500 - Inner elastic ring, 600 - Outer elastic ring, 700 - Bottom cover, 800 - gland.

[0036] The realization of the object of the present invention, functional features and advantages will be further described in conjunction with embodiments and with reference to the accompanying drawings. Detailed implementation manners

[0037] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0038] Those skilled in the art of the present technology can understand that, unless specifically stated otherwise, the singular forms "a", "an", "the", "above-mentioned" and "this" used herein may also include the plural forms. It should be further understood that the term "comprising" used in the description of the present invention means the presence of the described features, integers, steps, operations, elements, units, modules and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, units, modules, components and / or groups thereof. It should be understood that when we say that an element is "connected" or "coupled" to another element, it can be directly connected or coupled to other elements, or there may also be intermediate elements. In addition, the "connection" or "coupling" used herein may include wireless connection or wireless coupling. The phrase "and / or" used herein includes all or any unit and all combinations of one or more related listed items.

[0039] Those skilled in the art of the present technology can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of those of ordinary skill in the art to which the present invention belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted with an idealized or overly formal meaning unless specifically defined as here.

[0040] Referring to Figures 1 to 9 , in an embodiment of the present invention, a frictionless opening and closing hard-sealed ball valve includes:

[0041] A cylindrical valve body 100, on the outer wall of which a valve stem seat 110 and a bottom cover seat 120 are provided;

[0042] A sphere 200 is disposed within the valve body 100 and has a flow passage 210 passing therethrough. An upper groove 220 and a lower groove 230 are respectively provided at the upper and lower ends of the sphere 200.

[0043] A valve stem extends into the valve stem seat 110 and forms a fit with the upper groove 220.

[0044] Two valve seat heads 300 are connected to both ends of the valve body 100. An annular mounting step is provided at the inner end of the valve seat head 300. The mounting step includes a large step 310 and a small step 320 with a reduced diameter formed from the inside out in terms of thickness.

[0045] A hard seal sleeve 400 is cylindrical and mounted on the mounting step. One end of the hard seal sleeve 400 near the sphere 200 forms a seal with the sphere 200, and an annular fixing ring groove 410 is provided on the outer peripheral wall.

[0046] An inner elastic ring 500 has its outer end in the length direction mounted on the large step 310. The inner end of the inner elastic ring 500 in the length direction abuts against the fixing ring groove 410 and forms a clearance fit in the length direction of the hard seal sleeve 400.

[0047] An outer elastic ring 600 is mounted on the small step 320 and abuts against one end of the hard seal sleeve 400 away from the sphere 200.

[0048] A bottom cover 700 is mounted on the bottom cover seat 120 and forms a fit with the lower groove 230.

[0049] Wherein, one acting portion 240 is respectively provided at the upper and lower parts of the sphere 200. The acting portion 240 is evenly spaced with release portions 242 in the circumferential direction. A pressing portion 241 is provided between two of the release portions 242 on the acting portion 240. When the sphere 200 is in a closed and fully conducting state, the release portions 242 are transferred to the central position of the valve body 100 and form a clearance fit with the inner elastic ring 500, and when the pressing portion 241 is transferred to the central position of the valve body 100, it presses the inner elastic ring 500.

[0050] In the prior art, if the bonding force between the hard seal ring and the sphere is reduced, the sealing effect of the entire ball valve during the working process may be poor; conversely, if the bonding force between the hard seal ring and the sphere is increased, a higher driving force is required for the entire ball valve during the working process, and unnecessary wear is likely to occur.

[0051] In the present invention, the valve body 100 of the frictionless opening and closing hard seal ball valve is cylindrical, and a valve stem seat 110 and a bottom cover seat 120 are provided on the outer wall of the valve body 100. The valve stem seat 110 and the bottom cover seat 120 on the valve body 100 can be an installation structure or an integral structure.

[0052] The sphere 200 is disposed within the valve body 100 and has a flow passage 210 therethrough. The flow passage 210 is the position through which the fluid passes. Upper and lower grooves 220 and 230 are respectively provided at the upper and lower ends of the sphere 200, providing a working basis for the sphere 200 and being fixed, avoiding the unstable situation during the operation of a floating ball valve.

[0053] The valve stem extends into the valve stem seat 110 and forms a fit with the upper groove 220. Thus, the rotation of the valve stem can drive the rotation of the sphere 200. The combination mode between the valve stem and the upper groove 220 can be diverse, specifically based on being able to restrict the relative rotation between the two in the circumferential direction. For example, the lower end of the valve stem is a square shaft, and the upper groove 220 is a square groove corresponding to the square shaft.

[0054] Two valve seat heads 300 are connected to both ends of the valve body 100. The valve seat head 300 is the access position for the external pipeline. A flange structure or a threaded structure can be provided on the valve seat head 300, thus providing a basis for the access of the external pipeline. An annular installation step is provided at the inner end of the valve seat head 300, providing a basis for the subsequent installation of the hard seal sleeve 400. The installation step includes a large step 310 and a small step 320 with a reduced diameter formed from the inside to the outside in terms of thickness.

[0055] The hard seal sleeve 400 is cylindrical and installed on the installation step. One end of the hard seal sleeve 400 near the sphere 200 forms a seal with the sphere 200, and an annular fixing ring groove 410 is provided on the outer peripheral wall. The material of the hard seal sleeve 400 can be an alloy or a high-hardness polymer, etc., which is not limited herein.

[0056] One end in the length direction of the inner elastic ring 500 is installed on the large step 310. The inner end in the length direction of the inner elastic ring 500 abuts against the fixing ring groove 410 and forms a clearance fit in the length direction of the hard seal sleeve 400. Based on the large step 310 of the valve stem seat 110, the inner elastic ring 500 provides an elastic force to press the hard seal sleeve 400 towards the sphere 200, providing a basis for the seal between the hard seal sleeve 400 and the sphere 200. Only the inner end in the length direction of the inner elastic ring 500 contacts the hard seal sleeve 400, and the inner end in the length direction of the inner elastic ring 500 and the fixing ring groove 410 form a clearance fit in the length direction of the hard seal sleeve 400. Then, when the inner elastic ring 500 is pressed down to a certain extent, the inner elastic ring 500 will not directly drive the hard seal sleeve 400 away from the sphere 200. In some embodiments, the inner elastic ring 500 can be fixed to the valve seat head 300.

[0057] The outer elastic ring 600 is installed on the small step 320 and abuts against one end of the hard seal sleeve 400 away from the sphere 200. The outer elastic ring 600 and the inner elastic ring 500 are preferably but not limited to disc springs. In the normal state, the outer elastic ring 600 and the inner elastic ring 500 jointly press the hard seal sleeve 400 towards the sphere 200, so as to produce an excellent sealing effect.

[0058] The bottom cover 700 is installed on the bottom cover seat 120 and forms a fit with the lower groove 230. The bottom cover 700 can be a single-piece structure or a combined structure. While supporting the sphere 200, the bottom cover 700 does not limit the rotation of the sphere 200.

[0059] On the upper and lower parts of the sphere 200, there is respectively provided an acting part 240. On the acting part 240, release parts 242 are evenly spaced in the circumferential direction, and between two release parts 242 on the acting part 240, there is provided a pressing part 241. When the sphere 200 turns to the closed or conducting angle, the release parts 242 move to the central position of the valve body 100, the release parts 242 do not contact the inner elastic ring 500, and the inner elastic ring 500 is released. At this time, the elastic force of the inner elastic ring 500 acts completely on the hard seal sleeve 400. Coupled with the elastic force provided by the outer elastic ring 600, an excellent sealing effect is formed between the upper hard seal sleeve 400 and the sphere 200. When the sphere 200 turns to the partially conducting angle, the pressing part 241 moves to the central position of the valve body 100 and presses the inner elastic ring 500. At this time, the elastic force of the inner elastic ring 500 acts partially or not at all on the hard seal sleeve 400, and the sealing force between the hard seal sleeve 400 and the sphere 200 is provided by the outer elastic ring 600. At this time, while ensuring a certain contact sealing effect, the resistance to the rotation of the sphere 200 is greatly reduced.

[0060] In summary, the inner elastic ring 500 is installed on the large step 310 of the valve seat head 300 and forms a socket joint with the fixed ring groove 410 on the hard seal sleeve 400. The outer elastic ring 600 is installed on the small step 320 and abuts against one end of the hard seal sleeve 400 away from the sphere 200. On the sphere 200, there are arranged release parts 242 and pressing parts 241. When the sphere 200 turns to the closed or conducting angle, the release parts 242 do not contact the inner elastic ring 500, and the elastic force of the inner elastic ring 500 acts completely on the hard seal sleeve 400. A strong combination is formed between the upper hard seal sleeve 400 and the sphere 200 to form an excellent sealing effect. When the sphere 200 turns to the partially conducting angle, the pressing part 241 moves to the central position of the valve body 100 and presses the inner elastic ring 500. At this time, the elastic force of the inner elastic ring 500 acts partially or not at all on the hard seal sleeve 400, and the sealing force between the hard seal sleeve 400 and the sphere 200 is provided by the outer elastic ring 600. While ensuring a certain contact sealing effect, the frictional resistance to the rotation of the sphere 200 is greatly reduced.

[0061] Refer toFigure 3 , in one embodiment, the inner wall of the valve body 100 is cylindrical and corresponds to the groove structure 130 of the pressing portion 241 on the sphere 200.

[0062] Considering that the conventional shape of the valve body 100 is cylindrical and the inner diameter of the valve body 100 is the same as the outer diameter of the sphere 200, there is no working space for the pressing portion 241. In this embodiment, a groove structure 130 is provided at the position corresponding to the pressing portion 241 on the valve body 100, so as to provide space for the working of the pressing portion 241.

[0063] In one embodiment, the groove structure 130 is provided through the length direction of the valve body 100.

[0064] Considering that there is a large selection range for the structural form or size of the pressing portion 241 in different embodiments, in some cases, the installation of the sphere 200 cannot be achieved for the improvement of functional effects. Therefore, in this embodiment, the groove structure 130 is provided through the length direction of the valve body 100, so that the installation of various shaped spheres 200 can be achieved.

[0065] Refer to Figure 9 , in one embodiment, the acting portion 240 is integrally in a disc shape. Among them, in the circumferential direction of the acting portion 240, the releasing portion 242 is an inward concave notch, and the pressing portion 241 is an outward convex arc lobe.

[0066] In this embodiment, a structural form of the acting portion 240 is provided, which is integrally in a disc shape, recessed inward at a specific position to form a notch, and protruded outward at a specific position to form an arc lobe. When the sphere 200 turns to the closed or conducting angle, the notch moves to the center position of the valve body 100, and the inner elastic ring 500 is released. At this time, the elastic force of the inner elastic ring 500 acts completely on the hard seal sleeve 400, and together with the elastic force provided by the outer elastic ring 600, an excellent sealing effect is formed between the hard seal sleeve 400 and the sphere 200. When the sphere 200 turns to the partially conducting angle, the arc lobe moves to the center position of the valve body 100, and the inner elastic ring 500 is pressed. At this time, the elastic force of the inner elastic ring 500 acts partially or does not act on the hard seal sleeve 400 at all, and the sealing force between the hard seal sleeve 400 and the sphere 200 is provided by the outer elastic ring 600. At this time, while ensuring a certain contact sealing effect, the resistance to the rotation of the sphere 200 is greatly reduced. The above structure of the acting portion 240 has the characteristics of excellent use effect, smooth operation process, and simple processing process.

[0067] Refer to Figures 1 to 5 , in one embodiment, a gland 800 is further installed on the valve stem seat 110, which penetrates into the valve body 100 and clamps the sphere 200 with the bottom cover 700.

[0068] In this embodiment, in order to avoid the situation where the valve stem and the bottom cover 700 clamp the sphere 200 in the height direction and cause poor fixing and rotation operations of the valve stem, a gland 800 is introduced. The gland 800 and the bottom cover 700 are used to clamp the sphere 200. Furthermore, the function of the valve stem is only to complete the rotational drive of the sphere 200, and the possibility of abnormalities in the valve stem or the sphere 200 is reduced. The fixing method of the gland 800 on the valve stem seat 110 can be threaded connection or bolt connection, etc.

[0069] In one embodiment, the inner elastic ring 500 is a connecting structure in the circumferential direction, and the overall shape of the inner elastic ring 500 is frustum-shaped and the bottom end corresponds to the large step 310.

[0070] In this embodiment, the inner elastic ring 500 is a connecting structure in the circumferential direction, so that during the installation process, it will not be blocked by the structures of the hard seal sleeve 400 and the valve seat head 300. Specifically, the connecting method of the inner elastic ring 500 in the circumferential direction can be welding or bolt connection, etc. The overall shape of the inner elastic ring 500 is frustum-shaped, so that it can be conveniently fixed to the large step 310 and the fixed ring groove 410 at both ends respectively, and provide a basis for the acting part 240 of the sphere 200.

[0071] Refer to Figures 5 to 8 , in one embodiment, an annular cavity 330 is formed between the outer end in the length direction of the hard seal sleeve 400 and the inner wall of the valve seat head 300. An auxiliary sealing ring is arranged in the annular cavity 330, and a part of the outer elastic ring 600 extends into the annular cavity 330 to clamp the auxiliary sealing ring with the hard seal sleeve 400.

[0072] In this embodiment, the shapes of the outer elastic ring 600 and the hard seal sleeve 400 are set, so that the added auxiliary sealing ring can be clamped by the outer elastic ring 600 and the hard seal sleeve 400, thereby improving the sealing effect of the hard seal sleeve 400 in the circumferential direction. The material of the auxiliary sealing ring can be an inert high polymer material such as polyurethane or Teflon, which can provide a sealing effect and good environmental resistance at the same time.

[0073] In one embodiment, the pressing part 241 and the sphere 200 are an integral structure.

[0074] In this embodiment, the sphere 200 and the pressing part 241 are integrally formed, so that the possibility of abnormal overall shape is reduced and the installation difficulty is reduced. For example, the pressing part 241 and the sphere 200 as a whole can be completed by casting and then processed and modified, or the overall structure can be directly processed and formed by a machining center.

[0075] In one embodiment, the pressing part 241 is snap-connected, pin-connected or thread-connected to the sphere 200.

[0076] In this embodiment, by setting the pressing part 241 to be connected to the sphere 200, while reducing the processing difficulty, it also provides a basis for the later maintenance and replacement of the pressing part 241. Preferably, the pressing part 241 is fixed to the sphere 200 by bolts or pins.

[0077] In one embodiment, the inner elastic ring 500 and the outer elastic ring 600 are disc springs.

[0078] In this embodiment, the preferred types of the inner elastic ring 500 and the outer elastic ring 600 are given. Under the premise of stable structure, the disc springs achieve excellent elastic effects. It should be noted that the inner elastic ring 500 or the outer elastic ring 600 is not limited to only including one disc spring, and can also be a stack of multiple disc springs.

[0079] In summary, for the frictionless opening and closing hard-sealed ball valve provided by the present invention, the inner elastic ring 500 is installed on the large step 310 of the valve seat head 300 and forms a socket joint with the fixed ring groove 410 on the hard-sealing sleeve 400. The outer elastic ring 600 is installed on the small step 320 and abuts against one end of the hard-sealing sleeve 400 away from the sphere 200. The release part 242 and the pressing part 241 are arranged on the sphere 200. When the sphere 200 rotates to the closed or conducting angle, the release part 242 does not contact the inner elastic ring 500, and the elastic force of the inner elastic ring 500 acts completely on the hard-sealing sleeve 400, and a strong combination is formed between the upper hard-sealing sleeve 400 and the sphere 200 to form an excellent sealing effect. When the sphere 200 rotates to a partially conducting angle, the pressing part 241 moves to the central position of the valve body 100 and presses the inner elastic ring 500. At this time, the elastic force of the inner elastic ring 500 acts partially or not at all on the hard-sealing sleeve 400, and the sealing force between the hard-sealing sleeve 400 and the sphere 200 is provided by the outer elastic ring 600. While ensuring a certain contact sealing effect, the frictional resistance received by the rotation of the sphere 200 is greatly reduced.

[0080] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent structural or equivalent process transformations made by using the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are equally included in the patent protection scope of the present invention.

Claims

1. A frictionless opening and closing hard-sealed ball valve, characterized in that: include: The outer wall of the cylindrical valve body is provided with a valve stem seat and a bottom cover seat; A spherical body is disposed in the valve body and has a flow passage therethrough, wherein an upper groove and a lower groove are respectively disposed at the upper end and the lower end of the spherical body; A valve stem extending into the valve stem seat and mating with the upper groove; Two valve seat heads are connected to the two ends of the valve body, and the inner ends of the valve seat heads are provided with an annular installation step, and the installation step includes a large step and a small step with a reduced diameter from the inside to the outside in thickness; A hard sealing sleeve, which is cylindrical and installed on the installation step, wherein one end of the hard sealing sleeve close to the spherical body forms a seal with the spherical body and an annular fixing ring groove is provided on the outer peripheral wall; An inner elastic ring, the outer end of which in the length direction is mounted on the large step, and the inner end of which in the length direction abuts against the fixed ring groove and forms a clearance fit in the length direction of the hard sealing sleeve; An outer elastic ring is mounted on the small step and abuts against an end of the hard sealing sleeve away from the sphere; A bottom cover, mounted on the bottom cover seat and matched with the lower groove; Wherein, an action part is respectively arranged on the upper and lower parts of the sphere, and a release part is evenly spaced in the circumferential direction of the action part, and a pressing part is arranged between two release parts on the action part, and when the sphere is in a closed and fully conductive state, the release part is transferred to the center position of the valve body and is in a clearance fit with the inner elastic ring, and when the pressing part is transferred to the center position of the valve body, the inner elastic ring is pressed; The inner elastic ring is a connecting structure in the circumferential direction, and the overall shape of the inner elastic ring is a frustum, and the bottom end is arranged corresponding to the large step; The inner elastic ring is a butterfly spring.

2. The frictionless opening and closing hard-sealed ball valve according to claim 1 is characterized in that: The inner wall of the valve body is cylindrical and corresponds to the groove structure of the pressing part on the sphere.

3. The frictionless opening and closing hard-sealed ball valve according to claim 2 is characterized in that: The groove structure is arranged throughout the length direction of the valve body.

4. The frictionless opening and closing hard-sealed ball valve according to claim 3 is characterized in that: The action portion is disk-shaped as a whole, wherein in the circumferential direction of the action portion, the release portion is an inwardly concave notch, and the compression portion is an outwardly convex arc petal.

5. The frictionless opening and closing hard-sealed ball valve according to claim 1 is characterized in that: The valve stem seat is also provided with a pressure cover which penetrates into the valve body and clamps the ball with the bottom cover.

6. The frictionless opening and closing hard-sealed ball valve according to claim 1 is characterized in that: An annular cavity is formed between the outer end of the hard sealing sleeve in the length direction and the inner wall of the valve seat head, and an auxiliary sealing ring is arranged in the annular cavity. Part of the outer elastic ring extends into the annular cavity and clamps the auxiliary sealing ring with the hard sealing sleeve.

7. The frictionless opening and closing hard-sealed ball valve according to any one of claims 1 to 6, characterized in that: The pressing part and the spherical body are an integral structure.

8. The frictionless opening and closing hard-sealed ball valve according to any one of claims 1 to 6, characterized in that: The pressing portion is connected to the sphere by snapping, pinning or threading.

9. The frictionless opening and closing hard-sealed ball valve according to any one of claims 1 to 6, characterized in that: The outer elastic ring is a butterfly spring.

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