Hemiball valve

Abstract

The utility model relates to the technical field of valves, in particular to a semi-ball valve. The semi-ball valve comprises a valve body shell, a valve seat and a valve element. The valve seat is installed at the liquid inlet of the valve body shell, the axial width of the valve seat is constant, and the valve seat is provided with a first spherical sealing face facing the liquid outlet. The valve element is located in the inner cavity and rotatably installed on the valve body shell so that the valve element can rotate between an opening position and a closing position. In the closing position, the second spherical sealing face of the valve element is attached to the first spherical sealing face of the valve seat to close the liquid inlet, the sphere center of the second spherical sealing face of the valve element and the axis of the liquid inlet are located on the same vertical plane, and the sphere center of the second spherical sealing face of the valve element is located between the rotation center of the valve element and the second spherical sealing face of the valve element. The axis of the liquid inlet is horizontally spaced from the rotation center of the valve element. The semi-ball valve can be suitable for one-way sealing and two-way sealing.

Description

Technical Field

[0001] The utility model relates to the technical field of valve parts, and particularly to a semi-spherical valve. Background Art

[0002] The semi-spherical valve is a commonly used valve part. The semi-spherical valve generally includes a valve body housing, a valve seat and a valve core. The valve seat and the valve core are installed in the valve body housing. Moreover, the valve seat is elastically connected to the valve body housing, and the valve seat is biased towards the valve core in a natural state. When the semi-spherical valve is in an open state, the valve core and the valve seat are separated from each other. When the semi-spherical valve is in a closed state, the valve core and the valve seat are in sealing contact with each other. And under the action of the elastic force, the valve seat can expand and contract adaptively, so that the valve seat fits tightly with the valve core, so that the sealing between the valve core and the valve seat is good.

[0003] When the pressure of the liquid upstream of the semi-spherical valve is greater than or equal to the pressure of the liquid downstream of the semi-spherical valve, the valve seat and the valve core fit tightly with each other and the sealing is good. However, under some working conditions, the pressure of the liquid downstream of the semi-spherical valve is greater than the pressure of the liquid upstream of the semi-spherical valve. At this time, the liquid downstream of the semi-spherical valve will apply a pressure to the valve seat to make it away from the valve core, and the valve seat is compressed, resulting in that the valve seat and the valve core cannot fit tightly with each other, and the sealing performance of the semi-spherical valve is reduced.

[0004] Therefore, the existing semi-spherical valve is only suitable for one-way sealing and cannot be suitable for two-way sealing. Summary of the Utility Model

[0005] The purpose of the utility model is to overcome the problem that the existing semi-spherical valve in the prior art is only suitable for one-way sealing and cannot be suitable for two-way sealing.

[0006] To achieve the above purpose, the utility model provides a semi-spherical valve, which includes a valve body housing, a valve seat and a valve core; an inner cavity is arranged inside the valve body housing, a liquid inlet and a liquid outlet communicated with the inner cavity are arranged on the valve body housing, the liquid inlet and the liquid outlet are respectively located on opposite sides of the inner cavity, the valve seat is installed at the liquid inlet and has a constant axial width, and the valve seat has a first spherical sealing surface facing the liquid outlet; the valve core is located in the inner cavity and is rotatably installed on the valve body housing so as to be able to rotate between an open position and a closed position; in the open position, the second spherical sealing surface of the valve core is away from the first spherical sealing surface of the valve seat so that the liquid inlet and the liquid outlet are communicated; in the closed position, the second spherical sealing surface of the valve core fits with the first spherical sealing surface of the valve seat to close the liquid inlet, and the center of the ball of the second spherical sealing surface of the valve core and the axis of the liquid inlet are in the same vertical plane, the center of the ball of the second spherical sealing surface of the valve core is located between the rotation center of the valve core and the second spherical sealing surface of the valve core, and the axis of the liquid inlet is horizontally spaced from the rotation center of the valve core.

[0007] In some embodiments, in the direction from the open position to the closed position, a contact position is provided between the closed position and the open position, and the included angle range between the closed position and the contact position is 3° to 5°; the second spherical sealing surface of the valve core starts to contact or separate from the first spherical sealing surface of the valve seat at the contact position.

[0008] In some embodiments, the first spherical sealing surface of the valve seat and the second spherical sealing surface of the valve core are respectively entirely covered with wear-resistant metal layers.

[0009] In some embodiments, the valve seat includes a positioning ring, a first sealing ring, a sealing seat, and a second sealing ring distributed around the liquid inlet. The axes of the positioning ring, the first sealing ring, the sealing seat, and the second sealing ring are respectively collinear with the axis of the liquid inlet; the positioning ring is fixedly installed at the liquid inlet, and the positioning ring clamps the first sealing ring and the sealing seat between the valve body housing and the positioning ring. The sealing seat is located between the first sealing ring and the liquid inlet. A limiting ring for separating the first sealing ring and the sealing seat is provided on one side of the positioning ring facing the sealing ring; the sealing seat presses the second sealing ring between the valve body housing and the sealing seat, and a first spherical sealing surface is provided on one side of the sealing seat facing the liquid outlet.

[0010] In some embodiments, the valve body housing is provided with a positioning groove distributed around the liquid inlet, and the opening of the positioning groove faces the liquid outlet, and the outer side of the first sealing ring is embedded in the positioning groove.

[0011] In some embodiments, the valve body housing includes a housing and a top cover. An inner cavity is provided inside the housing. A liquid inlet and a liquid outlet are provided on the side of the housing. An opening is provided at the top of the housing, and the top cover seals the opening. A valve stem that can rotate circumferentially is provided through the top cover, and the valve stem is fixedly connected to the valve core.

[0012] In some embodiments, the top cover is provided with a perforation extending through. A wear-resistant sleeve is fixedly installed in the perforation. A first sealing cylinder is provided between the outer wall of the wear-resistant sleeve and the hole wall of the perforation; the wear-resistant sleeve is sleeved on the outer periphery of the valve stem, and a second sealing cylinder is provided between the inner wall of the wear-resistant sleeve and the outer wall of the valve stem.

[0013] In some embodiments, a plurality of sealing rings are sequentially and vertically attached between the inner wall of the wear-resistant sleeve and the outer wall of the valve stem, and the top cover is provided with a pressing plate for pressing the plurality of sealing rings.

[0014] In some embodiments, a base is provided in the valve body housing. A pivot groove is provided at the bottom of the valve core, and the base is inserted into the pivot groove. The inner wall of the pivot groove and the outer wall of the base are respectively entirely covered with wear-resistant metal layers, and a sealing cushion layer is provided between the inner wall of the pivot groove and the outer wall of the base.

[0015] In some embodiments, an inlet pipe communicating with the liquid inlet and an outlet pipe communicating with the liquid outlet are further provided on the valve body housing. The axis of the inlet pipe is collinear with the axis of the outlet pipe, and the inner diameter of the inlet pipe is the same as the diameter of the liquid inlet.

[0016] The above technical solution of the present utility model has the following technical effects:

[0017] When the valve core rotates to the closed position, after the second spherical sealing surface of the valve core fits with the first spherical sealing surface of the valve seat, the liquid inlet can be closed; even if the liquid pressure at the liquid outlet is greater than the liquid pressure at the liquid inlet, but since the valve seat is installed at the liquid inlet and has a constant axial width, the valve seat will not move away from the valve core due to the liquid pressure at the liquid inlet, and the second spherical sealing surface of the valve core and the first spherical sealing surface of the valve seat can still maintain a tight fit. Moreover, based on the distribution method of the ball center and the rotation center, the valve core forms a double-eccentric structure, similar to the cam wedging effect. The closer the valve core is to the closed position, the tighter the second spherical sealing surface of the valve core fits with the first spherical sealing surface of the valve seat, and the sealing performance is fully guaranteed. Therefore, the semi-spherical valve of the present utility model is applicable to both one-way sealing and two-way sealing. Description of the Drawings

[0018] Figure 1 is a vertical cross-sectional schematic view of the semi-spherical valve in an embodiment of the present utility model;

[0019] Figure 2 is Figure 1 a partial schematic view of part A in

[0020] Figure 3 is Figure 1 a partial schematic view of part B in

[0021] Figure 4 a schematic view of the projection of the valve core on the horizontal plane.

[0022] Description of the Reference Numerals

[0023] 1. Valve body housing; 11. Inner cavity; 12. Liquid inlet; 13. Liquid outlet; 14. Housing; 15. Top cover; 16. Positioning groove; 17. Base; 18. Sealing cushion layer; 2. Valve seat; 21. Positioning ring; 22. First sealing ring; 23. Second sealing ring; 24. Sealing seat; 25. Limiting ring; 26. First spherical sealing surface; 3. Valve core; 31. Second spherical sealing surface; 32. Ball center; 33. Rotation center; 4. Valve rod; 5. Wear-resistant sleeve; 51. Sealing ring; 52. Pressure plate; 53. First sealing cylinder; 54. Second sealing cylinder; 55. Third sealing cylinder; 6. Inlet pipe; 7. Outlet pipe. Detailed Embodiments

[0024] The features and exemplary embodiments of various aspects of the present utility model will be described in detail below. To make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present utility model and not to limit the present utility model. For those skilled in the art, the present utility model can be implemented without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present utility model by showing examples of the present utility model.

[0025] As Figure 1 and Figure 4 shown, the present utility model provides a semi-spherical valve, which includes a valve body housing 1, a valve seat 2 and a valve core 3. An inner cavity 11 is provided inside the valve body housing 1. A liquid inlet 12 and a liquid outlet 13 that are respectively communicated with the inner cavity 11 are provided on the valve body housing 1. The liquid inlet 12 and the liquid outlet 13 are respectively located on opposite sides of the inner cavity 11. The valve seat 2 is installed at the liquid inlet 12 and has a constant axial width. The valve seat 2 has a first spherical sealing surface 26 facing the liquid outlet 13. The valve core 3 is located in the inner cavity 11 and is rotatably installed in the valve body housing 1 so as to be able to rotate between an open position and a closed position. In the open position, the second spherical sealing surface 31 of the valve core 3 is away from the first spherical sealing surface 26 of the valve seat 2 to communicate the liquid inlet 12 and the liquid outlet 13. In the closed position, the second spherical sealing surface 31 of the valve core 3 fits with the first spherical sealing surface 26 of the valve seat 2 to close the liquid inlet 12, and the center of the sphere 32 of the second spherical sealing surface 31 of the valve core 3 and the axis L of the liquid inlet 12 are in the same vertical plane. The center of the sphere 32 of the second spherical sealing surface 31 of the valve core 3 is located between the rotation center 33 of the valve core 3 and the second spherical sealing surface 31 of the valve core 3. The axis L of the liquid inlet 12 is horizontally spaced from the rotation center 33 of the valve core 3.

[0026] Specifically, a liquid inlet 12 and a liquid outlet 13 are provided on the side wall of the valve body housing 1. The liquid inlet 12 and the liquid outlet 13 are opposite to each other in the horizontal direction. The valve core 3 is arranged between the liquid inlet 12 and the liquid outlet 13. The valve seat 2 is distributed around the liquid inlet 12, and a first spherical sealing surface 26 is provided on the side of the valve seat 2 facing the liquid outlet 13. The valve core 3 can rotate horizontally. When the valve core 3 rotates to the open position, the second spherical sealing surface 31 is away from the first spherical sealing surface 26 and the liquid inlet 12, and the liquid inlet 12 and the liquid outlet 13 are communicated, and at this time the half-ball valve is opened; when the valve core 3 rotates to the closed position, the second spherical sealing surface 31 of the valve core 3 blocks the liquid inlet 12, and the second spherical sealing surface 31 of the valve core 3 fits with the first spherical sealing surface 26 of the valve seat 2, and at this time the half-ball valve is closed. In addition, the center of the ball 32 is located between the rotation center 33 and the second spherical sealing surface 31 and between the rotation center 33 and the side surface of the valve core 3. When the valve core 3 is in the closed position, for the projection of the valve core 3 on the horizontal plane, the center of the ball 32 is on the axis L of the liquid inlet 12. The center of the ball 32 is located between the rotation center 33 and the second spherical sealing surface 31, and the axis L of the liquid inlet 12 is horizontally spaced from the rotation center 33.

[0027] In this embodiment, when the valve core 3 rotates to the closed position, the second spherical sealing surface 31 of the valve core 3 can block the liquid inlet 12 after fitting with the first spherical sealing surface 26 of the valve seat 2; even if the liquid pressure at the liquid outlet 13 is greater than the liquid pressure at the liquid inlet 12, but since the valve seat 2 is installed at the liquid inlet 12 and the axial width is constant, the valve seat 2 will not move away from the valve core 3 due to the liquid pressure at the liquid inlet 12, and the second spherical sealing surface 31 of the valve core 3 and the first spherical sealing surface 26 of the valve seat 2 can still maintain a tight fit. Moreover, based on the distribution mode of the center of the ball 32 and the rotation center 33, the valve core 3 forms a double-eccentric structure, similar to the cam wedging effect. The closer the valve core 3 is to the closed position, the tighter the second spherical sealing surface 31 of the valve core 3 fits with the first spherical sealing surface 26 of the valve seat 2, and the sealing performance is fully guaranteed. Therefore, the half-ball valve of the present invention can be applied to single-direction sealing and double-direction sealing.

[0028] In some embodiments, the valve core 3 can be U-shaped, C-shaped or O-shaped, etc. The top of the valve core 3 is rotatably connected to the top of the valve body housing 1, and the bottom of the valve core 3 is rotatably connected to the bottom of the valve body housing. And a liquid passage is provided in the middle of the valve core 3. When the valve core 3 is in the open position, the liquid inlet 12 is communicated with the liquid outlet 13 through this liquid passage. Of course, the valve core 3 can be in any form that can achieve the above technical effects, and the present invention is not limited.

[0029] In some embodiments of the present utility model, in the direction from the open position to the closed position, a contact position is provided between the closed position and the open position, and the included angle range between the closed position and the contact position is 3° to 5°; the second spherical sealing surface 31 of the valve core 3 starts to contact or separate from the first spherical sealing surface 26 of the valve seat 2 at the contact position.

[0030] Specifically, during the process of the valve core 3 rotating from the open position to the closed position, the first spherical sealing surface 26 and the second spherical sealing surface 31 start to contact at the contact position, and then continue to rotate an angle of 3° to 5°, and then it can rotate to the closed position. At this time, the first spherical sealing surface 26 and the second spherical sealing surface 31 are completely fitted. For the valve core 3 in the closed position, rotating an angle of 3° to 5° in the reverse direction can rotate to the contact position, and the first spherical sealing surface 26 and the second spherical sealing surface 31 start to separate from each other at the contact position. Therefore, the contact position is the demarcation position where the first spherical sealing surface 26 and the second spherical sealing surface 31 start to contact or separate.

[0031] In this embodiment, the valve core 3 is set as a double-eccentric structure. Only by rotating the valve core 3 by a small angle, the first spherical sealing surface 26 and the second spherical sealing surface 31 can quickly contact or separate from each other, avoiding unnecessary excessive extrusion, which helps to extend the service life of the semi-spherical valve. In addition, the movement track of the valve core 3 is similar to the movement track of the cam in the cam mechanism, and the valve core 3 can basically achieve frictionless stroke. Only when the valve core 3 rotates to the contact position, the first spherical sealing surface 26 and the second spherical sealing surface start to contact, effectively reducing the wear of the two sealing surfaces and extending the service life. During the process of the valve core 3 gradually approaching the closed position, the first spherical sealing surface 26 and the second spherical sealing surface are gradually pressed tightly. After exceeding the closed position, the two are pressed even tighter, so the sealing reliability is high.

[0032] In addition, during the process of the valve core 3 rotating from the closed position to the open position, the first spherical sealing surface 26 and the second spherical sealing surface 31 gradually move away, the flow channel is small, and the flow rate of the liquid is extremely fast. The liquid can wash and clean the first spherical sealing surface 26. While the valve core 3 is gradually approaching the closed position, the first spherical sealing surface 26 is like a scraper scraping across the second spherical sealing surface 31, and the first spherical sealing surface 26 can remove the deposits that may adhere to the second spherical sealing surface 31 to ensure the sealing reliability.

[0033] The present utility model explains the included angle between the closed position and the contact position as follows. When projected onto the horizontal plane, the projection of the rotation center 33 of the valve core 3 is a point, and the projection of the second spherical sealing surface 31 is an arc line. When the valve core 3 is in the closed position, the connection line between the rotation center 33 and the midpoint of the arc line is the first connection line; when the valve core 3 is in the contact position, the connection line between the rotation center 33 and the midpoint of the arc line is the second connection line, and the included angle range between the first connection line and the second connection line is 3° to 5°. Or rather, the first connection line reaches the position of the second connection line after rotating an angle of 3° to 5°. For the rotation process of the valve core 3, the rotation angle can also be understood with reference to the above content.

[0034] In some embodiments, the valve core 3 rotates 90° from the open position to the closed position. Of course, the rotation angle can be greater than or less than 90°. Moreover, since the valve core 3 has a double-eccentric structure, the valve core 3 cannot exceed the closed position excessively and can only return to the open position along the original movement trajectory.

[0035] In some embodiments of the present utility model, the first spherical sealing surface 26 of the valve seat 2 and the second spherical sealing surface 31 of the valve core 3 are respectively entirely covered with wear-resistant metal layers. The wear-resistant metal layers can enhance the wear resistance of the first spherical sealing surface 26 and the second spherical sealing surface 31, ensure long-term sealing between the first spherical sealing surface 26 and the second spherical sealing surface 31, and extend the service life of the hemispherical valve.

[0036] As Figure 2 shown, in some embodiments of the present utility model, the valve seat 2 includes a positioning ring 21, a first sealing ring 22, a sealing seat 24, and a second sealing ring 23 distributed around the liquid inlet 12. The axes of the positioning ring 21, the first sealing ring 22, the sealing seat 24, and the second sealing ring 23 are respectively collinear with the axis L of the liquid inlet 12; the positioning ring 21 is fixedly installed at the liquid inlet 12, and the positioning ring 21 clamps the first sealing ring 22 and the sealing seat 24 between the valve body housing 1 and the positioning ring 21. The sealing seat 24 is located between the first sealing ring 22 and the liquid inlet 12. The side of the positioning ring 21 facing the sealing ring is provided with a limiting ring 25 that separates the first sealing ring 22 and the sealing seat 24; the sealing seat 24 presses the second sealing ring 23 between the valve body housing 1 and the sealing seat 24, and the side of the sealing seat 24 facing the liquid outlet 13 is provided with a first spherical sealing surface 26.

[0037] Specifically, the surface of the positioning ring 21 facing the first sealing ring 22 is the pressing surface, and the limiting ring 25 is arranged on the pressing surface, and the limiting ring 25 can be integrally formed with the positioning ring 21. The limiting ring 25 radially divides the pressing surface into an outer pressing surface and an inner pressing surface. The outer pressing surface can press the first sealing ring 22, and the inner pressing surface can press the sealing seat 24. A convex ring is hermetically arranged on the radial outer side of the sealing seat 24. The radially outer side surface of the convex ring fits with the radially inner side surface of the limiting ring 25, and the inner pressing surface of the positioning ring 21 presses on the surface of the convex ring facing the positioning ring 21, and the surface of the convex ring facing away from the positioning ring 21 presses on the inner wall of the valve body housing 1. Therefore, through the cooperation of the convex ring and the positioning ring 21, the positioning ring 21 can press the sealing seat 24 on the inner wall of the valve body housing 1, and the limiting ring 25 can be filled between the convex ring and the first sealing ring 22 to prevent a gap from being generated between the convex ring and the first sealing ring 22. A second sealing ring 23 is arranged between the radially outer side surface of the sealing seat 24 and the inner wall of the valve body housing 1. The outer diameter of the second sealing ring 23 is smaller than the outer diameter of the convex ring, and the outer diameter of the second sealing ring 23 is the same as the outer diameter of the sealing seat 24 to simplify the structure of the sealing seat 24 and improve the sealing performance between the sealing seat 24 and the valve body housing 1. A first spherical sealing surface 26 is arranged on the side of the sealing seat 24 facing the valve core 3.

[0038] In this embodiment, the valve seat 2 is fixedly installed on the valve body housing 1, and the width of the valve seat 2 in the axial direction of the liquid inlet 12 is constant. Therefore, when the valve core 3 is sealed with the valve seat 2, even if the liquid pressure at the liquid outlet 13 is greater than the liquid pressure at the liquid inlet 12, the sealing performance between the two will not change.

[0039] In some embodiments, the surface of the positioning ring 21 facing away from the first sealing ring 22 is flush with the inner wall of the valve body housing 1. In some embodiments, the inner diameter of the sealing seat 24 is the same as the diameter of the liquid inlet 12.

[0040] As Figure 2 shown, in some embodiments of the present utility model, the valve body housing 1 is provided with a positioning groove 16 distributed around the liquid inlet 12, and the opening of the positioning groove 16 faces the liquid inlet 12, and the outer side of the first sealing ring 22 is embedded into the positioning groove 16.

[0041] Specifically, the positioning groove 16 increases the space between the valve body housing 1 and the limiting ring 25. Therefore, a larger-sized first sealing ring 22 can be arranged between the limiting ring 25 and the valve body housing 1. The larger-sized first sealing ring 22 has a larger sealing surface, which helps to enhance the sealing performance. In addition, the positioning groove 16 can also provide a certain installation allowance to make the sealing surface of the first sealing ring 22 fit flatly on the valve body housing 1 and the positioning ring 21.

[0042] As Figure 1As shown, in some embodiments of the present utility model, the valve body housing 1 includes a housing 14 and a top cover 15. An inner cavity 11 is provided inside the housing 14. A liquid inlet 12 and a liquid outlet 13 are provided on the side of the housing 14. An opening is provided at the top of the housing 14, and the top cover 15 seals the opening. A valve stem 4 that can rotate circumferentially is passed through the top cover 15, and the valve stem 4 is fixedly connected to the valve core 3.

[0043] Specifically, the valve stem 4 extends vertically from the outside of the valve body housing 1 to the inner cavity 11, and the bottom end of the valve stem 4 is fixedly connected to the top end of the valve core 3. Of course, there is a seal between the valve stem 4 and the valve core 3. By controlling the circumferential rotation of the valve stem 4, the valve core 3 can be rotated circumferentially. The top cover 15 and the housing 14 can be detachably connected.

[0044] As Figure 1 shown, in some embodiments of the present utility model, the top cover 15 is provided with a through hole. A wear-resistant sleeve 5 is fixedly installed in the through hole. A first sealing cylinder 53 is provided between the outer wall of the wear-resistant sleeve 5 and the hole wall of the through hole; the wear-resistant sleeve 5 is sleeved on the outer circumference of the valve stem 4, and a second sealing cylinder 54 is provided between the inner wall of the wear-resistant sleeve 5 and the outer wall of the valve stem 4.

[0045] Specifically, the material of the top cover 15 is different from that of the valve stem 4. The top cover 15 is relatively more prone to wear, resulting in a reduction in the sealing performance between the top cover 15 and the valve stem 4. However, the wear-resistant sleeve 5 is made of wear-resistant hard alloy and is not easily worn. Therefore, the wear-resistant sleeve 5 and the valve seat 2 can be sealed for a long time, which helps to extend the service life of the hemispherical valve.

[0046] In some embodiments, a first installation groove is provided around the hole wall of the through hole. The axis of the first installation groove is collinear with the axis of the through hole, and the depth of the first installation groove is less than the thickness of the first sealing cylinder 53. The outside of the first sealing cylinder 53 is embedded in the first installation groove.

[0047] In some embodiments, a second installation groove is provided around the inner wall of the wear-resistant sleeve 5. The axis of the second installation groove is collinear with the axis of the wear-resistant sleeve 5, and the depth of the second installation groove is less than the thickness of the second sealing cylinder 54. The outside of the second sealing cylinder 54 is embedded in the second installation groove.

[0048] As Figure 3 shown, in some embodiments of the present utility model, a plurality of sealing rings 51 that are vertically and sequentially fitted are further provided between the inner wall of the wear-resistant sleeve 5 and the outer wall of the valve stem 4, and the top cover 15 is provided with a pressing plate 52 that presses the plurality of sealing rings 51.

[0049] Specifically, the second sealing cylinder 54 is arranged close to the inner cavity 11, the sealing ring 51 is arranged away from the inner cavity 11, the sealing ring 51 is located above the second sealing cylinder 54, and the sealing ring 51 and the second sealing cylinder 54 are vertically spaced apart. All the sealing rings 51 are stacked vertically. The pressing plate 52 is annular, the pressing plate 52 is sleeved on the outer periphery of the valve stem 4, and the pressing plate 52 is fixedly connected to the top cover 15 through a plurality of bolts. The top cover 15 can press down all the sealing rings 51 so that these sealing rings 51 are closely attached to each other; and the inner wall of the sealing ring 51 is closely attached to the outer wall of the valve stem 4, and the outer wall of the sealing ring 51 is closely attached to the inner wall of the wear-resistant sleeve 5, thereby enhancing the sealing performance between the wear-resistant sleeve 5 and the valve stem 4.

[0050] In some embodiments, a third installation groove is provided at the inner wall of the top of the wear-resistant sleeve 5, and all the sealing rings 51 are installed in the third installation groove.

[0051] In some embodiments, the bottom of the wear-resistant sleeve 5 is inserted into the top of the valve core 3, and the two are fixedly connected, and a third sealing cylinder 55 is provided between the wear-resistant sleeve 5 and the valve core 3 to enhance the sealing performance.

[0052] As Figure 1 shown, in some embodiments of the present invention, a base 17 is provided in the valve body housing 1, a pivot groove is provided at the bottom of the valve core 3, the base 17 is inserted into the pivot groove, and the inner wall of the pivot groove and the outer wall of the base 17 are all covered with a wear-resistant metal layer, and a sealing cushion layer 18 is provided between the inner wall of the pivot groove and the outer wall of the base 17. The wear-resistant metal layer can enhance the wear resistance between the base 17 and the valve core 3 and extend the service life of the ball valve. The sealing cushion layer 18 can form a seal between the pivot groove and the base 17 to prevent pollutants from entering between the base 17 and the pivot groove and hindering the smooth rotation of the valve core 3.

[0053] As Figure 1 shown, in some embodiments of the present invention, a liquid inlet pipe 6 communicating with the liquid inlet 12 and a liquid outlet pipe 7 communicating with the liquid outlet 13 are further provided on the valve body housing 1. The axis of the liquid inlet pipe 6 is collinear with the axis of the liquid outlet pipe 7, and the inner diameter of the liquid inlet pipe 6 is the same as the diameter of the liquid inlet 12. The liquid inlet pipe 6 is of a full-bore design, that is, there is no diameter change inside the liquid inlet pipe 6, so dead zones are not easily formed in the liquid inlet pipe 6, which helps to prevent the second spherical sealing surface 31 from scaling.

[0054] In this article, specific examples are used to elaborate on the principle and implementation mode of the present utility model. The description of the above examples is only used to help understand the method and its core idea of the present utility model. The above is only the preferred implementation mode of the present utility model. It should be noted that due to the limited nature of literal expression and objectively infinite specific structures, for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements, embellishments or changes can be made, or the above technical features can be combined in an appropriate manner; these improvements, embellishments, changes or combinations, or directly applying the concept and technical solution of the present utility model to other occasions without improvement, shall all be regarded as the protection scope of the present utility model.

Claims

1. A hemispherical valve, characterized in that: The valve body comprises a valve shell (1), a valve seat (2) and a valve core (3); an inner cavity (11) is provided inside the valve body shell (1); a liquid inlet (12) and a liquid outlet (13) are provided on the valve body shell (1) and are respectively connected to the inner cavity (11); the liquid inlet (12) and the liquid outlet (13) are respectively located on opposite sides of the inner cavity (11); the valve seat (2) is installed at the liquid inlet (12) and has a constant axial width; the valve seat (2) has a first spherical sealing surface (26) facing the liquid outlet (13); The valve core (3) is located in the inner cavity (11) and is rotatably mounted on the valve body housing (1) so as to be rotatable between an open position and a closed position; in the open position, the second spherical sealing surface (31) of the valve core (3) is away from the first spherical sealing surface (26) of the valve seat (2) so that the liquid inlet (12) and the liquid outlet (13) are in communication; in the closed position, the second spherical sealing surface (31) of the valve core (3) is in contact with the first spherical sealing surface (26) of the valve seat (2) (26) is fitted to close the liquid inlet (12), and the center (32) of the second spherical sealing surface (31) of the valve core (3) and the axis of the liquid inlet (12) are in the same vertical plane, the center (32) of the second spherical sealing surface (31) of the valve core (3) is located between the rotation center (33) of the valve core (3) and the second spherical sealing surface (31) of the valve core (3), and the axis of the liquid inlet (12) is horizontally spaced from the rotation center (33) of the valve core (3).

2. The hemispherical valve according to claim 1, characterized in that: In the direction from the open position to the closed position, a contact position is provided between the closed position and the open position, and the angle between the closed position and the contact position ranges from 3° to 5°; the second spherical sealing surface (31) of the valve core (3) and the first spherical sealing surface (26) of the valve seat (2) begin to contact or lose contact at the contact position.

3. The hemispherical valve according to claim 1, characterized in that: The first spherical sealing surface (26) of the valve seat (2) and the second spherical sealing surface (31) of the valve core (3) are respectively and completely covered with a wear-resistant metal layer.

4. The hemispherical valve according to claim 2 or 3, characterized in that: The valve seat (2) comprises a positioning ring (21), a first sealing ring (22), a sealing seat (24) and a second sealing ring (23) which are distributed around the liquid inlet (12), and the axis of the positioning ring (21), the axis of the first sealing ring (22), the axis of the sealing seat (24) and the axis of the second sealing ring (23) are respectively collinear with the axis of the liquid inlet (12); The positioning ring (21) is fixedly mounted at the liquid inlet (12); the positioning ring (21) clamps the first sealing ring (22) and the sealing seat (24) between the valve body shell (1) and the positioning ring (21); the sealing seat (24) is located between the first sealing ring (22) and the liquid inlet (12); a limiting ring (25) is provided on the side of the positioning ring (21) facing the sealing ring to separate the first sealing ring (22) and the sealing seat (24); the sealing seat (24) presses the second sealing ring (23) between the valve body shell (1) and the sealing seat (24); and the first spherical sealing surface (26) is provided on the side of the sealing seat (24) facing the liquid outlet (13).

5. The hemispherical valve according to claim 4, characterized in that: The valve body shell (1) is provided with positioning grooves (16) distributed around the liquid inlet (12), and the opening of the positioning grooves (16) faces the liquid inlet (12), and the outer side of the first sealing ring (22) is embedded in the positioning grooves (16).

6. The hemispherical valve according to claim 2 or 3, characterized in that: The valve body shell (1) comprises a shell (14) and a top cover (15); the inner cavity (11) is provided inside the shell (14); the liquid inlet (12) and the liquid outlet (13) are provided on the side of the shell (14); an opening is provided at the top of the shell (14); the top cover (15) seals the opening; a valve stem (4) capable of circumferential rotation is passed through the top cover (15); and the valve stem (4) is fixedly connected to the valve core (3).

7. The hemispherical valve according to claim 6, characterized in that: The top cover (15) is provided with a through hole extending therethrough, a wear-resistant sleeve (5) is fixedly installed in the through hole, and a first sealing sleeve (53) is provided between the outer wall of the wear-resistant sleeve (5) and the hole wall of the through hole; the wear-resistant sleeve (5) is sleeved on the outer periphery of the valve stem (4), and a second sealing sleeve (54) is provided between the inner wall of the wear-resistant sleeve (5) and the outer wall of the valve stem (4).

8. The hemispherical valve according to claim 7, characterized in that: A plurality of sealing rings (51) vertically fitted in sequence are provided between the inner wall of the wear-resistant sleeve (5) and the outer wall of the valve stem (4), and the top cover (15) is provided with a pressing plate (52) for pressing the plurality of sealing rings (51) tightly.

9. The hemispherical valve according to claim 2 or 3, characterized in that: A base (17) is provided in the valve body shell (1), a pivot groove is provided at the bottom of the valve core (3), the base (17) is inserted into the pivot groove, the inner wall of the pivot groove and the outer wall of the base (17) are all covered with a wear-resistant metal layer, and a sealing gasket layer (18) is provided between the inner wall of the pivot groove and the outer wall of the base (17).

10. The hemispherical valve according to claim 2 or 3, characterized in that: The valve body shell (1) is also provided with a liquid inlet pipe (6) connected to the liquid inlet (12) and a liquid outlet pipe (7) connected to the liquid outlet (13); the axis of the liquid inlet pipe (6) is colinear with the axis of the liquid outlet pipe (7); and the inner diameter of the liquid inlet pipe (6) is the same as the diameter of the liquid inlet (12).

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