Hard sealing ball valve capable of being opened and closed without friction

Abstract

According to the friction-free opening and closing hard sealing ball valve, an inner elastic ring is installed on a large step of a valve seat head and connected with a fixing ring groove in a hard sealing sleeve in a sleeving mode, an outer elastic ring is installed on a small step and abuts against the end, away from a ball body, of the hard sealing sleeve, and a releasing part and a pressing part are distributed on the ball body; according to the friction-free opening and closing hard sealing ball valve, when the ball body turns to a closing or opening angle, the release part does not make contact with the inner elastic ring, the elastic force of the inner elastic ring completely acts on the hard sealing sleeve, and the upper hard sealing sleeve and the ball body are strongly combined to form an excellent sealing effect. When the ball body turns to a partial conduction angle, the pressing part is transferred to the central position of the valve body to press the inner elastic ring, at the moment, the elastic force of the inner elastic ring partially acts on or completely does not act on the hard sealing sleeve, the sealing force between the hard sealing sleeve and the ball body is provided through the outer elastic ring, a certain contact sealing effect is guaranteed, and meanwhile the sealing effect is improved. Friction resistance borne by rotation of the ball is greatly reduced.

Description

Technical Field

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

[0002] In the prior art, hard-sealed ball valves are valves used in pipeline systems. They are characterized by using the rotation of the ball to control the flow of fluid. The so-called "hard seal" means that the sealing surface of the ball valve is made of hard materials, such as metal-to-metal sealing. This sealing method can form a very close contact when closed, thereby achieving a good sealing effect. Hard-sealed ball valves are suitable for high temperature, high pressure and some corrosive media because they have good pressure resistance, temperature resistance and corrosion resistance.

[0003] Since the seal of the hard seal ball valve is made of hard material, the resistance of the entire valve operation is relatively large, especially in the use environment with high sealing requirements. If the binding force between the hard seal ring and the ball is reduced, the sealing effect of the entire ball valve may be poor during operation; on the contrary, if the binding force between the hard seal ring and the ball is increased, the driving force of the entire ball valve during operation is required to be higher, and unnecessary wear is likely to occur. Summary of the invention

[0004] The main purpose of the present invention is to provide a frictionless opening and closing hard-sealed ball valve, aiming to solve the problem that the friction of the hard-sealed ball valve cannot meet the requirements under various usage conditions.

[0005] In order to achieve the above object, the present invention provides a frictionless opening and closing hard-sealed ball valve, comprising: 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; Among them, an action part is respectively provided on the upper and lower parts of the sphere, and the action part is provided with release parts evenly spaced in the circumferential direction, and a compression part is provided between the two release parts on the action part. 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 the compression part compresses the inner elastic ring when it is transferred to the center position of the valve body.

[0006] Furthermore, the inner wall of the valve body is cylindrical and corresponds to the groove structure of the pressing part on the sphere.

[0007] Furthermore, the groove structure is arranged throughout the length direction of the valve body.

[0008] Furthermore, the action portion is disc-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.

[0009] Furthermore, a pressure cover which penetrates into the valve body and clamps the ball with the bottom cover is also installed on the valve stem seat.

[0010] Furthermore, 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.

[0011] Furthermore, 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, an auxiliary sealing ring is arranged in the annular cavity, and part of the outer elastic ring extends into the annular cavity to clamp the auxiliary sealing ring with the hard sealing sleeve.

[0012] Furthermore, the compression portion and the spherical body are an integral structure.

[0013] Furthermore, the pressing portion is connected to the sphere by snap-fitting, pinning or threading.

[0014] Furthermore, the inner elastic ring and the outer elastic ring are butterfly springs.

[0015] 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 is sleeved with the fixed ring groove on the hard sealing sleeve, an outer elastic ring installed on the small step and abuts against the end of the hard sealing sleeve away from the sphere, and a release part and a compression part are arranged on the sphere. When the sphere is turned to a closed or conductive angle, the release part does not contact the inner elastic ring, and the elastic force of the inner elastic ring completely acts on the hard sealing sleeve, and the upper hard sealing sleeve and the sphere are strongly combined to form an excellent sealing effect. When the sphere is turned to a partially conductive angle, the compression part is transferred to the center position of the valve body and compresses the inner elastic ring. At this time, the elastic force of the inner elastic ring partially acts on the hard sealing sleeve or does not act at all. The sealing force between the hard sealing sleeve and the sphere is provided by the outer elastic ring, which ensures a certain contact sealing effect while greatly reducing the friction resistance of the sphere rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of a frictionless opening and closing hard-sealed ball valve according to a first embodiment of the present invention; Figure 2 Schematic diagram of a ball in a frictionless opening and closing hard-sealed ball valve according to a first embodiment of the present invention; Figure 3 Schematic diagram of the valve body in the frictionless opening and closing hard-sealed ball valve of the first embodiment of the present invention; Figure 4 It is a cross-sectional schematic diagram of a frictionless opening and closing hard-sealed ball valve of the first embodiment of the present invention (the inner elastic ring is compressed by the pressing part); Figure 5 It is a cross-sectional schematic diagram of a 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); Figure 6 yes Figure 5 A partial enlarged view of the Figure 7 It is a cross-sectional schematic diagram of a 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); Figure 8 yes Figure 7 A partial enlarged view of the Fig. 9 It is a schematic diagram of a ball in a frictionless opening and closing hard-sealed ball valve according to a second embodiment of the present invention.

[0017] Reference numerals: 100-valve body, 110-valve stem seat, 120-bottom cover seat, 130-groove structure, 200-ball, 210-flow channel, 220-upper groove, 230-lower groove, 240-action part, 241-compression part, 242-release part, 300-valve seat head, 310-large step, 320-small step, 330-ring cavity, 400-hard sealing sleeve, 410-fixed ring groove, 500-inner elastic ring, 600-outer elastic ring, 700-bottom cover, 800-pressure cover.

[0018] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0019] 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.

[0020] Those skilled in the art will appreciate that, unless expressly stated otherwise, the singular forms "a", "an", "said", "above", and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the 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 refer to an element as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may be intermediate elements. In addition, the "connection" or "coupling" used herein may include wireless connection or wireless coupling. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0021] Those skilled in the art will understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art in the field to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as here.

[0022] Reference Figures 1 to 9 In one embodiment of the present invention, a frictionless opening and closing hard-sealed ball valve comprises: The cylindrical valve body 100 has a valve stem seat 110 and a bottom cover seat 120 disposed on the outer wall; The ball 200 is disposed in the valve body 100 and has a flow channel 210 passing through it. The upper end and the lower end of the ball 200 are respectively provided with an upper groove 220 and a lower groove 230; The valve stem extends into the valve stem seat 110 and matches with the upper groove 220; Two valve seat heads 300 are connected to both ends of the valve body 100. The inner end of the valve seat head 300 is provided with an annular installation step. The installation step includes a large step 310 and a small step 320 with a reduced diameter from the inside to the outside in thickness. A hard sealing sleeve 400 is cylindrical and installed on the installation step. The hard sealing sleeve 400 forms a seal with the sphere 200 at one end thereof close to the sphere 200 and an annular fixing ring groove 410 is provided on the outer peripheral wall thereof. The inner elastic ring 500, the outer end in the length direction is installed on the large step 310, the inner end in the length direction of the inner elastic ring 500 abuts against the fixed ring groove 410 and forms a clearance fit in the length direction of the hard sealing sleeve 400; An outer elastic ring 600 is mounted on the small step 320 and abuts against an end of the hard sealing sleeve 400 away from the sphere 200; A bottom cover 700 is mounted on the bottom cover seat 120 and matches with the lower groove 230; Among them, an action portion 240 is respectively provided on the upper and lower parts of the sphere 200, and the action portion 240 is evenly spaced with release portions 242 in the circumferential direction, and a compression portion 241 is provided between the two release portions 242 on the action portion 240. When the sphere 200 is in a closed and fully conductive state, the release portion 242 is transferred to the center position of the valve body 100 and is in a clearance fit with the inner elastic ring 500, and the compression portion 241 compresses the inner elastic ring 500 when it is transferred to the center position of the valve body 100.

[0023] In the prior art, if the binding force between the hard sealing ring and the ball is reduced, the sealing effect of the entire ball valve may be poor during operation; conversely, if the binding force between the hard sealing ring and the ball is increased, the driving force requirement of the entire ball valve during operation is higher and unnecessary wear is easily generated.

[0024] In the present invention, the valve body 100 of the frictionless opening and closing hard-sealed ball valve is cylindrical, and a valve stem seat 110 and a bottom cover seat 120 are arranged on the outer wall of the valve body 100. The valve stem seat 110 and the bottom cover seat 120 can be an installation structure or an integrated structure on the valve body 100.

[0025] The ball 200 is disposed in the valve body 100 and is penetrated by a flow channel 210. The flow channel 210 is a position for the fluid to pass through. The upper end and the lower end of the ball 200 are respectively provided with an upper groove 220 and a lower groove 230, which provide a working basis for the ball 200 and are fixed, thereby avoiding the instability of the working process of the floating ball valve.

[0026] The valve stem extends into the valve stem seat 110 and forms a match with the upper groove 220. Thus, the rotation of the valve stem can drive the rotation of the ball 200. The valve stem and the upper groove 220 can be combined in various ways, specifically based on limiting 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.

[0027] 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 external pipelines. A flange structure or a threaded structure can be provided on the valve seat head 300 to provide a basis for the access of external pipelines. An annular installation step is provided at the inner end of the valve seat head 300 to provide a basis for the subsequent installation of the hard sealing sleeve 400. The installation step includes a large step 310 and a small step 320 with a reduced diameter from the inside to the outside in thickness.

[0028] The hard seal sleeve 400 is cylindrical and installed on the installation step, and the hard seal sleeve 400 forms a seal with the sphere 200 at one end near the sphere 200 and has an annular fixing ring groove 410 on the outer peripheral wall. The material of the hard seal sleeve 400 can be alloy or high hardness polymer, etc., which is not limited here.

[0029] One end of the inner elastic ring 500 in the length direction is installed on the large step 310, and the inner end of the inner elastic ring 500 in the length direction abuts against the fixed ring groove 410, and forms a clearance fit in the length direction of the hard sealing sleeve 400. The inner elastic ring 500 is based on the large step 310 of the valve stem seat 110, and the elastic force provided presses the hard sealing sleeve 400 toward the ball 200, providing a basis for the seal between the hard sealing sleeve 400 and the ball 200. Only the inner end of the inner elastic ring 500 in the length direction contacts the hard sealing sleeve 400, and the inner end of the inner elastic ring 500 in the length direction forms a clearance fit with the fixed ring groove 410 in the length direction of the hard sealing sleeve 400, so when the inner elastic ring 500 is pressed down to a certain extent, the inner elastic ring 500 will not directly drive the hard sealing sleeve 400 away from the ball 200. In some embodiments, the inner elastic ring 500 can be fixed to the valve seat head 300.

[0030] The outer elastic ring 600 is installed on the small step 320 and abuts against the end of the hard sealing 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. Under normal conditions, the outer elastic ring 600 and the inner elastic ring 500 jointly press the hard sealing sleeve 400 toward the sphere 200, so as to produce an excellent sealing effect.

[0031] The bottom cover 700 is mounted on the bottom cover seat 120 and matches with the lower groove 230. The bottom cover 700 can be a single structure or a combined structure. The bottom cover 700 supports the sphere 200 without limiting the rotation of the sphere 200.

[0032] An acting part 240 is respectively provided at the upper and lower parts of the sphere 200, and the acting part 240 is provided with release parts 242 evenly spaced in the circumferential direction, and a pressing part 241 is provided between the two release parts 242 on the acting part 240. When the sphere 200 turns to a closed or conducting angle, the release part 242 moves to the center position of the valve body 100, and the release part 242 does not contact the inner elastic ring 500, but releases the inner elastic ring 500. At this time, the elastic force of the inner elastic ring 500 completely acts on the hard sealing sleeve 400, and the elastic force provided by the outer elastic ring 600 forms an excellent sealing effect between the upper hard sealing sleeve 400 and the sphere 200. When the ball 200 turns to a partially conductive angle, the pressing portion 241 moves to the center of the valve body 100 and presses the inner elastic ring 500. At this time, the elastic force of the inner elastic ring 500 partially acts on or does not act on the hard sealing sleeve 400 at all. The sealing force between the hard sealing sleeve 400 and the ball 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 ball 200 is greatly reduced.

[0033] In summary, the inner elastic ring 500 is mounted on the large step 310 of the valve seat head 300 and is sleeved with the fixed ring groove 410 on the hard sealing sleeve 400, the outer elastic ring 600 is mounted on the small step 320 and abuts against the end of the hard sealing sleeve 400 away from the ball 200, and the ball 200 is provided with a release portion 242 and a pressing portion 241. When the ball 200 turns to a closed or conducting angle, the release portion 242 does not contact the inner elastic ring 500, and the elastic force of the inner elastic ring 500 completely acts on the hard sealing sleeve 400, and the upper hard sealing sleeve 400 and the ball 200 are strongly combined to form an excellent sealing effect. When the ball 200 turns to a partially conductive angle, the pressing portion 241 moves to the center of the valve body 100 and presses the inner elastic ring 500. At this time, the elastic force of the inner elastic ring 500 partially acts on or does not act on the hard sealing sleeve 400 at all. The sealing force between the hard sealing sleeve 400 and the ball 200 is provided by the outer elastic ring 600. While ensuring a certain contact sealing effect, the friction resistance encountered by the ball 200 during rotation is greatly reduced.

[0034] Reference Figure 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 .

[0035] Considering that the conventional shape of the valve body 100 is cylindrical and the inner diameter of the valve body 100 is consistent with the outer diameter of the sphere 200, the compression portion 241 has no working space. In this embodiment, a groove structure 130 is provided on the valve body 100 at a position corresponding to the compression portion 241, thereby providing space for the compression portion 241 to work.

[0036] In one embodiment, the groove structure 130 is disposed throughout the length direction of the valve body 100 .

[0037] Considering that the structural form or size of the pressing portion 241 has a wide range of choices in different embodiments, in some cases, the installation of the ball 200 for improving the functional effect cannot be achieved. Therefore, in this embodiment, the groove structure 130 is arranged to penetrate the length direction of the valve body 100, so that the installation of various shapes of the ball 200 can be achieved.

[0038] Reference Fig. 9 In one embodiment, the action portion 240 is disc-shaped as a whole, wherein, in the circumferential direction of the action portion 240, the release portion 242 is an inwardly concave notch, and the pressing portion 241 is an outwardly convex arc petal.

[0039] In this embodiment, a structure of the action part 240 is provided, which is disk-shaped as a whole, is concave inward at a specific position to form a notch, and protrudes outward at a specific position to form an arc flap. When the ball 200 turns to a closed or conductive angle, the notch is transferred to the center 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 completely acts on the hard sealing sleeve 400, and the elastic force provided by the outer elastic ring 600 is added, and an excellent sealing effect is formed between the upper hard sealing sleeve 400 and the ball 200. When the ball 200 turns to a partially conductive angle, the arc flap is transferred to the center 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 partially acts on the hard sealing sleeve 400 or does not act at all. The sealing force between the hard sealing sleeve 400 and the ball 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 ball 200 is greatly reduced. The structure of the above-mentioned action part 240 has the characteristics of excellent use effect, smooth operation process and simple processing process.

[0040] Reference Figures 1 to 5 In one embodiment, a pressure cover 800 is installed on the valve stem seat 110 and penetrates into the valve body 100 and clamps the ball 200 with the bottom cover 700.

[0041] In this embodiment, in order to avoid the situation that the valve stem and the bottom cover 700 clamp the ball 200 in the height direction, the fixing and rotating operation of the valve stem are prone to failure, the gland 800 is introduced, and the gland 800 and the bottom cover 700 are used to clamp the ball 200, so that the function of the valve stem is only to complete the rotation drive of the ball 200, and the possibility of abnormality of the valve stem or the ball 200 is reduced. The fixing method of the gland 800 on the valve stem seat 110 can be threaded connection or bolt connection.

[0042] In one embodiment, the inner elastic ring 500 is a connecting structure in the circumferential direction. The overall shape of the inner elastic ring 500 is a frustum and the bottom end is arranged corresponding to the large step 310 .

[0043] In this embodiment, the inner elastic ring 500 is a connection structure in the circumferential direction, so that it will not be hindered by the structure of the hard sealing sleeve 400 and the valve seat head 300 during the installation process. The specific connection method of the inner elastic ring 500 in the circumferential direction can be welding or bolt connection. The overall shape of the inner elastic ring 500 is a frustum, so that the two ends can be easily fixed to the large step 310 and the fixing ring groove 410 respectively, and provide a foundation for the action part 240 of the ball 200.

[0044] Reference Figures 5 to 8 In one embodiment, an annular cavity 330 is formed between the outer end of the hard sealing sleeve 400 in the length direction and the inner wall of the valve seat head 300, and an auxiliary sealing ring is arranged in the annular cavity 330. A portion of the outer elastic ring 600 extends into the annular cavity 330 and clamps the auxiliary sealing ring with the hard sealing sleeve 400.

[0045] In this embodiment, the shape of the outer elastic ring 600 and the shape of the hard sealing sleeve 400 are set so that the added auxiliary sealing ring can be clamped by the outer elastic ring 600 and the hard sealing sleeve 400, thereby improving the sealing effect of the hard sealing sleeve 400 in the circumferential direction. The material of the auxiliary sealing ring can be an inert polymer material such as polyurethane or Teflon, which can provide a good sealing effect and high-quality environmental resistance.

[0046] In one embodiment, the pressing portion 241 and the spherical body 200 are an integral structure.

[0047] In this embodiment, the sphere 200 and the pressing part 241 are integrally formed, so the possibility of overall shape abnormality is reduced and the difficulty of installation is reduced. For example, the pressing part 241 and the sphere 200 can be cast and then processed and modified, or the overall structure can be directly processed and formed by a machining center.

[0048] In one embodiment, the pressing portion 241 is connected to the sphere 200 by snapping, pinning or threading.

[0049] In this embodiment, the pressing part 241 is arranged to be connected to the sphere 200, which reduces the difficulty of processing and 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.

[0050] In one embodiment, the inner elastic ring 500 and the outer elastic ring 600 are butterfly springs.

[0051] In this embodiment, the preferred selection of the inner elastic ring 500 and the outer elastic ring 600 is provided, and the butterfly spring achieves a high-quality elastic effect under the premise of stable structure. It should be noted that the inner elastic ring 500 or the outer elastic ring 600 is not limited to only include one butterfly spring, and multiple butterfly springs can also be stacked.

[0052] In summary, in 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 is sleeved 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 the end of the hard sealing sleeve 400 away from the ball 200, and the ball 200 is provided with a release portion 242 and a pressing portion 241. When the ball 200 turns to a closed or conducting angle, the release portion 242 does not contact the inner elastic ring 500, and the elastic force of the inner elastic ring 500 completely acts on the hard sealing sleeve 400, and the upper hard sealing sleeve 400 and the ball 200 are strongly combined to form an excellent sealing effect. When the ball 200 turns to a partially conductive angle, the pressing portion 241 moves to the center of the valve body 100 and presses the inner elastic ring 500. At this time, the elastic force of the inner elastic ring 500 partially acts on or does not act on the hard sealing sleeve 400 at all. The sealing force between the hard sealing sleeve 400 and the ball 200 is provided by the outer elastic ring 600. While ensuring a certain contact sealing effect, the friction resistance encountered by the ball 200 during rotation is greatly reduced.

[0053] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also 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; Among them, an action part is respectively provided on the upper and lower parts of the sphere, and the action part is provided with release parts evenly spaced in the circumferential direction, and a compression part is provided between the two release parts on the action part. 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 the compression part compresses the inner elastic ring when it is transferred to the center position of the valve body.

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: The inner elastic ring is a connecting structure in the circumferential direction. The overall shape of the inner elastic ring is a frustum, and the bottom end is arranged corresponding to the large step.

7. 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.

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

9. The frictionless opening and closing hard-sealed ball valve according to any one of claims 1 to 7, characterized in that: The pressing portion is connected to the sphere by snapping, pinning or threading.

10. The frictionless opening and closing hard-sealed ball valve according to any one of claims 1 to 7, characterized in that: The inner elastic ring and the outer elastic ring are butterfly springs.

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