Multi-channel selector valve structure

Abstract

The invention discloses a multi-channel selector valve structure, and belongs to the technical field of hydraulic pressure. The valve seat is of a cubic structure, four mounting feet are arranged at the bottom of the valve seat, and each mounting foot is provided with a mounting hole; a through hole B is formed in a symmetrical face of the valve seat, a through hole A is formed in the other face of the valve seat, the through hole B is perpendicular to and communicated with the through hole A, four threaded holes are evenly distributed around the through hole B and the through hole A, and the threaded holes in the two sides of the through hole B are connected with flange plates of the connector B and the connector C through screws respectively. Four threaded holes in the through hole A are connected with the flange plate of the connector A through screws; a mounting hole for mounting the indicating cover plate is formed in the top of the valve seat and communicated with the through hole A and the through hole B in a penetrating mode, a cavity is formed in the valve seat, and four threaded mounting holes are formed in the four corners of the plane of the top of the valve seat and connected with the indicating cover plate through screws. The device is used for cutting off, distributing and changing the flowing direction of a medium so as to improve the maintainability and supportability of external field equipment.

Description

Technical Field

[0001] The invention discloses a multi-channel selection valve structure, belonging to the technical field of hydraulic pressure. Background Art

[0002] With the development of aviation technology, the flow direction of media in various systems of aircraft is complicated. Multi-channel selector valve is a product used in aircraft hydraulic, fuel or environmental control systems, and can also be used in ground support equipment. Multi-channel selector valve mainly changes the relative position between the valve core and the valve body by adjusting the handle, thereby achieving different flow rates and flow directions of the pressure medium, ensuring that the medium meets the required flow characteristics. A multi-channel selector valve can be used for many types of media, such as petroleum-based hydraulic oil, phosphate ester hydraulic oil, kerosene, lubricating oil, air, etc. Different materials of sealing rings can be selected for different media. The sealing rings are mainly adapted to environmental changes such as high temperature and low temperature of the medium. Summary of the invention

[0003] The purpose of the present invention is to provide a multi-channel selection valve structure with simple and reliable structure, long service life, convenient operation and high reliability.

[0004] The technical solution of the present invention is:

[0005] A multi-channel selection valve structure includes a valve seat, a spherical valve core, a spring seat, a spring, a connection joint C, a sealing gasket, an O-ring, a connection joint B, a connection joint A, an indicating cover plate and a rotating handle. The valve seat is a cubic structure, and four mounting feet are provided at the bottom of the valve seat, each of which has a mounting hole; a through hole B is provided on a symmetrical surface of the valve seat, and the through hole A is provided on the other surface of the valve seat, and the through hole B is perpendicular to and penetrates the through hole A, and four threaded holes are evenly distributed around the through hole B and the through hole A, and the threaded holes on both sides of the through hole B are respectively connected to the flanges of the connection joint B and the connection joint C by screws, and the four threaded holes on the through hole A are connected to the flange of the connection joint A by screws; the top of the valve seat has a mounting hole for installing the indicating cover plate, and the mounting hole is connected to the through hole A and the through hole B, forming a cavity inside the valve seat, and four threaded mounting holes are provided at the four corners of the top plane, which are connected to the indicating cover plate by screws.

[0006] Furthermore, the connecting joint C is a rotating body structure as a whole, and one end of the connecting joint C has a flange structure, which is connected to the valve seat by four screws; the middle part is a cylindrical structure, and a laser mark "C" is engraved on the middle of the cylinder, and the front end of the cylindrical structure has platforms evenly distributed in four places for the wrench to hold; the other end of the connecting joint C is provided with an external thread, which is connected to the external pipeline; the connecting joint C is provided with a front end on one side of the external thread, with a 24° non-flared sealing surface, and has a gradually smaller stepped center hole from one end of the connecting joint A with the flange structure to the other end, and the center holes are all connected, and the stepped center hole includes a first center hole and a second center hole.

[0007] Furthermore, the second center hole is installed in cooperation with the spring seat, and a spring is installed between the spring seat and the second center hole of the connecting joint C; the first center hole at the lower end of the connecting joint C is installed in cooperation with the sealing gasket.

[0008] Furthermore, an O-ring is provided between the bottom of the flange of the connecting joint C and the valve seat. No matter where the spherical valve core is located, the O-ring between the connecting joint C and the valve seat always maintains a seal.

[0009] Furthermore, the spring seat is a rotating body structure, the core holes at both ends are larger than the middle core hole, the middle boss serves as the first support of the spring, and the bottom of the second center hole of the connecting joint C serves as the second support of the spring. Under the action of the spring force, the sealing gasket and the spherical valve core are sealed by spherical matching.

[0010] Furthermore, the sealing gasket is a composite material seal with carbon fiber added, which is set as a cylindrical sheet structure, and four fan-shaped grooves are evenly distributed around the cylinder. The four fan-shaped grooves generate radial pressure under the action of high-pressure oil to ensure the seal with the spherical surface. At the same time, the axial liquid pressure acting on the cylindrical plane maintains the seal with the spherical surface, and can automatically compensate for the wear of the spherical surface through compression deformation.

[0011] Furthermore, the connection joint B has the same structure as the connection joint C, and a laser mark "B" is engraved in the middle of the middle cylindrical structure. The connection joint A has the same structure as the connection joint C, and a laser mark "A" is engraved in the middle of the middle cylindrical structure. The installation method between the connection joints B and C and the valve seat is exactly the same as the installation method between the connection joint C and the valve seat.

[0012] Furthermore, the spherical valve core is a spherical structure, and hole 1, hole 2, and hole 3 are respectively provided at three positions of the ball, and the three holes are interconnected, hole 1 and hole 2 form an angle of 80°, and hole 2 and hole 3 form an angle of 60°; wherein hole 1 and hole 2 are cut with a platform, and hole 3 has no platform, and the size of the platform cut is to ensure the contact area between the valve core and the sealing gasket during rotation, thereby ensuring different sealing areas between the valve core and the sealing gasket during rotation, corresponding to the angle indication areas of different scales on the indicator cover; a larger hole is provided on the top of the spherical valve core, a rectangular groove is provided below, and a rectangular boss is provided at the bottom of the rotating shaft, and the rectangular boss is inserted into the rectangular groove. When the rotating shaft rotates, the spherical valve core is driven to rotate accordingly.

[0013] Furthermore, the rotating shaft is a rotating body structure, with a rectangular boss at the bottom and an external thread on the outside of the top. The rotating handle and the rotating shaft are connected by a hexagonal nut and the external thread on the top. A sealing groove is provided in the middle of the rotating shaft. No matter where the rotating shaft rotates to, the O-ring between the rotating shaft and the indicating cover plate always remains sealed. A square bevel groove is opened at the lower end of the sealing groove, evenly distributed along the central axis. The bottom and both sides of the square bevel groove are rounded. The spherical marble cooperates with the square bevel groove under the action of the spring to limit the axial rotation of the rotating shaft.

[0014] Furthermore, four through holes are evenly distributed around the upper part of the indicator cover plate, and it is connected to the valve seat with four screws; an O-ring is provided at the upper connection between the indicator cover plate and the valve seat, and the O-ring of the indicator cover plate and the valve seat always remains sealed regardless of how the rotating shaft rotates; there is a through stepped hole in the middle of the indicator cover plate, and under the action of the spring, the rotating shaft and the stepped hole plane of the indicator cover plate are tightly attached to limit the axial displacement. Six blind holes are evenly distributed on the upper part of the stepped hole of the indicator cover plate, and a rectangular groove is provided at the mouth of each blind hole. One end of the spring is installed in the blind hole, and the other end cooperates with the spring seat. An elastic retaining ring is installed in the rectangular groove. Under the action of the spring, the spherical marble is limited in the square inclined groove of the rotating shaft through the elastic retaining ring.

[0015] Technical Effects

[0016] The present invention designs a multi-channel selector valve structure for cutting off, distributing and changing the flow direction of the medium to improve the maintainability and security of field equipment. The multi-channel selector valve structure is simple and reliable, has a long service life, is easy to operate and has high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall three-dimensional structure of a multi-channel selection valve of the present invention;

[0018] Figure 2 This is a schematic diagram of a spherical valve core and a valve seat structure in a multi-channel selector valve structure of the present invention.

[0019] 1 is the valve seat, 2 is the spherical valve core, 3 is the spring seat, 4 is the spring, 5 is the connection joint C, 6 is the sealing gasket, 7 is the O-ring, 8 is the connection joint B, and 9 is the connection joint A;

[0020] Figure 3 is a schematic diagram of a half-cut three-dimensional structure of a connection joint A;

[0021] Figure 4 This is a schematic diagram of the spherical valve core and the regulating handle structure in a multi-channel selector valve structure of the present invention.

[0022] 10 is a hexagonal nut, 11 is an indicator cover, 12 is an O-ring, 13 is a spring, 14 is a rotating shaft, 15 is an O-ring, and 16 is a rotating handle;

[0023] Figure 5 It is a schematic diagram of the structure of the rotation adjustment limit device.

[0024] Among them, 17 is a spring, 18 is a spring seat, 19 is a spherical marble, and 20 is an elastic retaining ring;

[0025] Figure 6 is a schematic diagram of the three-dimensional structure of the rotating shaft 14;

[0026] Figure 7 is a schematic diagram of the three-dimensional structure of the sealing gasket 6;

[0027] Figure 8 It is a three-dimensional structural schematic diagram of the spherical valve core 2;

[0028] Fig. 9 1 is a schematic diagram of the structure of the indicator cover 11. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the implementation of the present invention clearer, the technical scheme in the embodiment of the present invention will be described in more detail in combination with the embodiment of the present invention. In the example, the same or similar reference numerals throughout represent the same or similar originals or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, not all of them. The embodiments described below by reference are exemplary and intended to be used to explain the present invention, and should not be construed as limitations on the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention. The following is a detailed description in combination with the embodiments of the present invention.

[0030] This section is an embodiment of the present invention, which is used to explain and illustrate the technical solution of the present invention.

[0031] A multi-channel selector valve structure includes a valve seat 1, a spherical valve core 2, a spring seat 3, a spring 4, a connection joint C5, a sealing gasket 6, an O-ring 7, a connection joint B8, a connection joint A9, an indication cover plate 11 and a rotary handle 16. The valve seat 1 is a cubic structure, and four mounting feet are provided at the bottom of the valve seat, each of which has a mounting hole; a through hole B is provided on a symmetrical surface of the valve seat 1, and a through hole A is provided on the other surface of the valve seat 1, and the through hole B is perpendicular to and penetrates the through hole A, and four threaded holes are evenly distributed around the through hole B and the through hole A, and the threaded holes on both sides of the through hole B are respectively connected to the flanges of the connection joint B8 and the connection joint C5 by screws, and the four threaded holes on the through hole A are connected to the flange of the connection joint A9 by screws; the top of the valve seat has a mounting hole for installing the indication cover plate 11, and the mounting hole is connected to the through hole A and the through hole B, forming a cavity inside the valve seat 1, and four threaded mounting holes are provided at the four corners of the top plane, which are connected to the indication cover plate 11 by screws.

[0032] The connecting joint C5 is a rotating body structure as a whole. One end of the connecting joint C5 has a flange structure, which is connected to the valve seat by four screws; the middle part is a cylindrical structure, and the middle part of the cylinder is engraved with a laser mark "C", and the front end of the cylindrical structure has platforms evenly distributed in four places for the wrench to hold; the other end of the connecting joint C5 is provided with an external thread, which is connected to the external pipeline; the connecting joint C5 is provided with a front end on one side of the external thread, with a 24° non-flared sealing surface, and has a gradually smaller stepped center hole from one end of the connecting joint A5 with the flange structure to the other end, and the center holes are all connected, and the stepped center hole includes a first center hole and a second center hole.

[0033] The second center hole is installed in cooperation with the spring seat 3 , and a spring 4 is installed between the spring seat 3 and the second center hole of the connecting joint C5 ; the first center hole at the lower end of the connecting joint C5 is installed in cooperation with the sealing gasket 6 .

[0034] An O-ring 7 is provided between the bottom of the flange of the connecting joint C5 and the valve seat 1. No matter where the spherical valve core 2 is located, the O-ring of the connecting joint C5 and the valve seat 1 always maintains a seal.

[0035] The spring seat 3 is a rotating body structure, the core holes at both ends are larger than the middle core hole, the middle boss serves as the first support of the spring, and the bottom of the second center hole of the connecting joint C5 serves as the second support of the spring. Under the action of the spring force, the sealing gasket 6 and the spherical valve core 2 form a seal by spherical fit.

[0036] The sealing gasket 6 is a composite material seal with carbon fiber added, which is set as a cylindrical thin sheet structure, and four fan-shaped grooves are evenly distributed around the cylinder. The four fan-shaped grooves generate radial pressure under the action of high-pressure oil to ensure the seal with the spherical surface. At the same time, the axial liquid pressure acting on the cylindrical plane maintains the seal with the spherical surface, and can automatically compensate for the wear of the spherical surface through compression deformation.

[0037] The connection joint B8 has the same structure as the connection joint C5, and a laser mark "B" is engraved in the middle of the central cylindrical structure.

[0038] The connection joint A9 has the same structure as the connection joint C5, and a laser mark "A" is engraved in the middle of the central cylindrical structure.

[0039] The installation method between the connecting joint B8, the connecting joint C9 and the valve seat 1 is exactly the same as the installation method between the connecting joint C5 and the valve seat 1.

[0040] The spherical valve core 2 is a spherical structure, and holes 1, 2, and 3 are respectively provided at three positions of the ball. The three holes are interconnected, and hole 1 and hole 2 form an angle of 80°, and hole 2 and hole 3 form an angle of 60°; wherein holes 1 and 2 are cut with a platform, and hole 3 has no platform, and the size of the platform cutout is to ensure the size of the contact area between the valve core 2 and the sealing gasket 6 during the rotation process, thereby ensuring that the different sealing areas of the valve core 2 and the sealing gasket 6 during the rotation process correspond to the angle indicating areas of different scales on the indicating cover plate 11; a larger hole 4 is provided on the top of the spherical valve core 2, and a rectangular groove is provided below, and a rectangular boss is provided at the bottom of the rotating shaft 14, and the rectangular boss is inserted into the rectangular groove. When the rotating shaft 14 rotates, the spherical valve core 2 is driven to rotate accordingly.

[0041] The rotating shaft 14 is a rotating body structure, with a rectangular boss at the bottom and external threads on the top. The rotating handle 16 and the rotating shaft 14 are connected by the hexagonal nut 10 and the external threads on the top. A sealing groove is provided in the middle of the rotating shaft 14. No matter where the rotating shaft 14 rotates to, the O-ring 15 between the rotating shaft 14 and the indicating cover plate 11 always maintains a seal. Figure 5 As shown, a square bevel groove is opened at the lower end of the sealing groove, which is evenly distributed at 18 along the central axis. The bottom of the square bevel groove and both sides of the groove are rounded. The spherical marble 19 cooperates with the square bevel groove under the action of the spring 18 to limit the axial rotation of the rotating shaft 14.

[0042] Four through holes are evenly distributed around the upper part of the indicating cover plate 11, and it is connected to the valve seat 1 with four screws; an O-ring 12 is provided at the upper connection between the indicating cover plate 11 and the valve seat 1, and the O-ring between the indicating cover plate 11 and the valve seat 1 always maintains a seal regardless of how the rotating shaft 14 rotates; a stepped hole is provided through the middle of the indicating cover plate 11, and under the action of the spring 13, the rotating shaft 14 is in close contact with the stepped hole plane of the indicating cover plate 11 to limit the axial displacement.

[0043] Six blind holes are evenly distributed on the upper part of the stepped hole of the indicator cover 11, and a rectangular groove is provided at the opening of each blind hole. One end of the spring 17 is installed in the blind hole, and the other end cooperates with the spring seat 18. An elastic retaining ring 20 is installed in the rectangular groove. Under the action of the spring 17, the spherical marble 19 is limited in the square oblique groove of the rotating shaft 14 through the elastic retaining ring 20.

[0044] like Figure 6 As shown, the surface of the indicator cover 11 has product working indication marks, which are engraved with "A, B pass", "A, C pass", "B, C pass", "A, B, C pass" and "A, B, C blocked", and are distinguished by different colors.

[0045] The rotating handle 16 has a cylindrical structure in the middle and symmetrical rectangular structures at both ends. There are two countersunk holes of different diameters at both ends of the cylindrical structure, and a rectangular hole is provided in the middle of the rectangular structure. An arrow is engraved on the upper end face of the rotating handle 16, and the arrow is painted red; the upper part of the stepped shaft of the rotating shaft 14 fits with the lower end face of the rotating handle 16, and the hexagonal nut 10 is screwed into the countersunk hole with a larger diameter and fits with the lower end face of the countersunk hole.

[0046] The present invention will be further described below through the accompanying drawings and specific embodiments:

[0047] Please also see Figures 1 to 6 .

[0048] like Figure 1 , Figure 2 As shown, it is a schematic diagram of the structure of the multi-channel selector valve of the present invention. The multi-channel selector valve is usually fixed to the platform by four mounting feet at the bottom of the valve seat 1; the connecting joint C5, the connecting joint B8, the connecting joint A9 (such as Figure 3 The flange plate (as shown) is connected to the valve seat 1 by screws, and each connection joint is connected to the external pipeline. A sealing ring is provided between the connection joint C5, the connection joint B8, the connection joint A9 and the valve seat 1. The indicating cover plate 11 is connected to the valve seat 1 by four screws, and a sealing ring is provided between the indicating cover plate 11 and the valve seat 1.

[0049] like Figure 4 , Figure 6 As shown, the spherical valve core 2 is installed in the valve seat 1, and a larger hole is provided on the top of the spherical valve core 2. One end of the spring acts on the bottom of the hole. The spherical valve core 2 limits the axial displacement under the action of the spring force and can only rotate along the axial direction; a rectangular groove is provided at the bottom of the hole of the spherical valve core 2, and the rectangular boss of the rotating shaft 14 cooperates with the rectangular groove, and connected holes are provided in three directions of the spherical valve core 2, and the spherical valve core rotates with the rotation of the rotating shaft 14.

[0050] like Figure 5 , Figure 6As shown, a square bevel groove is provided at the upper end of the sealing groove in the middle of the rotating shaft 14, and a V-shaped ring groove is provided at the upper end of the square bevel groove. Six spherical marbles 19 are embedded in the square bevel groove to limit the rotating shaft 14 from rotating axially, forming the first position; force is applied axially downward and the handle 16 is rotated at the same time, driving the rotating shaft 14 connected thereto downward, and the six spherical marbles are separated from the square bevel groove and enter the V-shaped ring groove at the upper end. At this time, the angle can be rotated, and the rotating handle 16 can be released, and the six spherical marbles are embedded in another square bevel groove to form the second position; since the rectangular boss at the bottom of the rotating shaft 14 is connected to the rectangular groove of the spherical valve core 2, the spherical valve core 2 can be stopped at a certain position of the circumference by pressing the rotating handle 16 and then rotating it. A sealing ring is provided between the rotating shaft 14 and the indicating cover plate 11 to prevent external leakage between them.

[0051] like Figure 1 to Figure 3 , Figure 7-8 As shown, the five seals in the multi-channel selector valve structure of the present invention act to seal the high-pressure fluid. All five seals are type I seals. The O-ring 7 prevents the internal pressure medium from flowing out from the connecting joints C5, B8, and A9 to cause external leakage. The O-ring 12 mainly prevents external leakage between the valve seat 1 and the indicating cover plate 8, and the O-ring 15 mainly prevents external leakage between the rotating shaft 14 and the indicating cover plate 8. The three seals in the multi-channel selector valve structure of the present invention isolate the high-pressure fluid between the connecting joints through different sealing areas between the sealing gasket 6 and the valve core 2, so as to prevent each connecting joint from internal leakage through the spherical valve core 1.

[0052] like Figure 1 , Fig. 9 As shown, the rotary handle 16 is turned to drive the rotary shaft 14 and the spherical valve core 2 to rotate together. Through different combinations of the number and position of the outlets of the spherical valve core 2 and the outlets on the valve seat 1, various forms of multi-position multi-pass are realized. The on-off state is displayed and identified by the position of the arrow corresponding to the indicating cover plate 8 on the rotary handle 16. The indicating cover plate 8 has status displays such as "A, B pass", "A, C pass", "B, C pass", "A, B, C pass" and "A, B, C blocked", and they are distinguished by green and red colors.

[0053] It is understood by those skilled in the art that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of ordinary technicians in the field to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and unless defined as here, will not be interpreted with idealized or overly formal meanings. The specific implementation methods described above further describe the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the present invention. Within the spirit and principle of the present invention, any technician familiar with the profession may use the above disclosed technical content to change or modify it into an equivalent embodiment of equivalent changes for application in other fields, but any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the technical solution content of the present invention, any modification, equivalent replacement, improvement, etc., made according to the technical essence of the present invention, should be included in the protection scope of the present invention.

Claims

1. A multi-channel selector valve structure, characterized in that: It includes a valve seat, a spherical valve core, a spring seat, a spring, a connecting joint C, a sealing gasket, an O-ring, a connecting joint B, a connecting joint A, an indicating cover plate and a rotating handle; the valve seat is a cubic structure, and four mounting feet are arranged at the bottom of the valve seat, and each mounting foot has a mounting hole; a through hole B is arranged on a symmetrical surface on the valve seat, and the through hole A is arranged on the other surface of the valve seat, and the through hole B is perpendicular to and penetrates the through hole A, and four threaded holes are evenly distributed around the through hole B and the through hole A, and the threaded holes on both sides of the through hole B are respectively connected to the connecting joint B and the connecting joint C flange with screws, and the four threaded holes on the through hole A are connected to the connecting joint A flange with screws; the top of the valve seat is provided with a mounting hole for installing the indicating cover plate, and the mounting hole is connected to the through hole A and the through hole B to form a cavity inside the valve seat, and four threaded mounting holes are arranged at the four corners of the top plane, which are connected to the indicating cover plate with screws.

2. The structure according to claim 1, characterized in that: The connecting joint C is a rotating body structure as a whole. One end of the connecting joint C has a flange structure and is connected to the valve seat by four screws; the middle part is a cylindrical structure, and a laser mark "C" is engraved on the middle of the cylinder. The front end of the cylindrical structure has platforms evenly distributed in four places for the wrench to hold; the other end of the connecting joint C is provided with an external thread and is connected to the external pipeline; the connecting joint C is provided with a front end on one side of the external thread, with a 24° non-flared sealing surface, and has a gradually smaller stepped center hole from one end of the connecting joint A with the flange structure to the other end, and the center holes are all connected, and the stepped center hole includes a first center hole and a second center hole.

3. The structure according to claim 2, characterized in that: The second center hole is installed in cooperation with the spring seat, and a spring is installed between the spring seat and the second center hole of the connecting joint C; the first center hole at the lower end of the connecting joint C is installed in cooperation with the sealing gasket.

4. The structure according to claim 3, characterized in that: An O-ring is provided between the bottom of the flange of the connection joint C and the valve seat. No matter where the spherical valve core is located, the O-ring between the connection joint C and the valve seat always maintains a seal.

5. The structure according to claim 4, characterized in that: The spring seat is a rotating body structure, the core holes at both ends are larger than the middle core hole, the middle boss serves as the first support of the spring, and the bottom of the second center hole of the connecting joint C serves as the second support of the spring. Under the action of the spring force, the sealing gasket and the spherical valve core form a seal by spherical fit.

6. The structure according to claim 5, characterized in that: The sealing gasket is a composite seal with added carbon fiber, which is set as a cylindrical thin sheet structure. Four fan-shaped grooves are evenly distributed around the cylinder. The four fan-shaped grooves generate radial pressure under the action of high-pressure oil to ensure the seal with the spherical surface; at the same time, the axial liquid pressure acting on the cylindrical plane maintains the seal with the spherical surface, and can automatically compensate for the spherical surface wear through compression deformation.

7. The structure according to claim 6, characterized in that: The structure of the connection joint B is the same as that of the connection joint C, and a laser mark "B" is engraved in the middle of the central cylindrical structure; the structure of the connection joint A is the same as that of the connection joint C, and a laser mark "A" is engraved in the middle of the central cylindrical structure; the installation method between the connection joints B and C and the valve seat is exactly the same as the installation method between the connection joint C and the valve seat.

8. The structure according to claim 7, characterized in that: The spherical valve core is a spherical structure, with holes 1, 2 and 3 respectively provided at three positions of the ball. The three holes are interconnected, with hole 1 and hole 2 forming an angle of 80°, and hole 2 and hole 3 forming an angle of 60°. Holes 1 and 2 are cut with a platform, while hole 3 has no platform. The size of the platform cutout is to ensure the contact area between the valve core and the sealing gasket during rotation, thereby ensuring that the different sealing areas between the valve core and the sealing gasket during rotation correspond to the angle indication areas of different scales on the indicator cover. A larger hole is provided on the top of the spherical valve core, a rectangular groove is provided below, and a rectangular boss is provided at the bottom of the rotating shaft. The rectangular boss is inserted into the rectangular groove. When the rotating shaft rotates, the spherical valve core is driven to rotate accordingly.

9. The structure according to claim 8, characterized in that: The rotating shaft is a rotating body structure with a rectangular boss at the bottom and an external thread on the outside of the top. The rotating handle and the rotating shaft are connected by a hexagonal nut and the top external thread. A sealing groove is provided in the middle of the rotating shaft. No matter where the rotating shaft rotates to, the O-ring between the rotating shaft and the indicating cover plate always remains sealed. A square bevel groove is opened at the lower end of the sealing groove, which is evenly distributed along the center axis. The bottom and both sides of the square bevel groove are rounded. The spherical marble cooperates with the square bevel groove under the action of the spring to limit the axial rotation of the rotating shaft.

10. The structure according to claim 9, characterized in that: Four through holes are evenly distributed around the upper part of the indicating cover plate, which is connected to the valve seat with four screws; an O-ring is provided at the upper connection between the indicating cover plate and the valve seat, and the O-ring of the indicating cover plate and the valve seat always remains sealed regardless of how the rotating shaft rotates; a through stepped hole is provided in the middle of the indicating cover plate, and under the action of the spring, the rotating shaft and the stepped hole plane of the indicating cover plate are in close contact to limit axial displacement; six blind holes are evenly distributed on the upper part of the stepped hole of the indicating cover plate, and a rectangular groove is provided at the mouth of each blind hole, one end of the spring is installed in the blind hole, and the other end cooperates with the spring seat, and an elastic retaining ring is installed in the rectangular groove, and under the action of the spring, the spherical marble is limited in the square inclined groove of the rotating shaft through the elastic retaining ring.

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