High-pressure butt welding hydrogen energy ball valve structure

Abstract

The utility model relates to the technical field of valves, in particular to a high-pressure butt welding hydrogen energy ball valve structure which comprises a valve body, an installation cavity is formed in the valve body, and medium channels are arranged at the two ends of the valve body and directly face the installation cavity respectively in a penetrating mode. The valve seats are installed at the two ends of the installation cavity respectively, and the valve element is installed between the two valve seats in the installation cavity through the valve rod. The valve element is provided with a connecting through hole which is horizontally formed in a penetrating mode and can communicate the two medium channels. An actuator is arranged above the valve body, and the driving end of the actuator is connected with the valve rod and can drive the valve element to rotate so that the two medium channels can be disconnected. The two ends of the valve body protrude outwards to form butt welding protruding pipes correspondingly, and the medium channel communicates with the butt welding protruding pipes. The utility model has the characteristics that the structural design is simpler and more reasonable, the use cost can be reduced, and the working reliability can be better maintained.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a high-pressure butt-welding hydrogen energy ball valve structure. Background Art

[0002] Ball valves are mainly used for cutting off, distributing and changing the flow direction of media in pipelines. A hydrogen energy ball valve refers to a device for regulating, controlling and guiding the flow of hydrogen, and is mainly applied to scenarios such as vehicle-mounted hydrogen storage / supply systems, fuel cell power systems, and hydrogen production, storage, transportation and refueling systems.

[0003] A high-pressure butt-welding hydrogen energy ball valve is a valve body applied in a high-pressure environment and used for transporting and cutting off hydrogen energy. The two ends of the high-pressure butt-welding hydrogen energy ball valve are usually connected to the pipeline by welding. In the existing structure, the valve body part is an integral body, and the two ends of the valve body are directly welded to the pipeline. Such a structural design is not reasonable enough. Once the valve body is damaged, it will be scrapped as a whole, increasing the use cost. Secondly, during the working process, both the valve core and the valve seat will wear, resulting in a decrease in working reliability as the working time of the ball valve increases.

[0004] Therefore, how to provide a high-pressure butt-welding hydrogen energy ball valve structure with a simpler and more reasonable structural design, which can reduce the use cost and better maintain the working reliability has become a technical problem to be solved by those skilled in the art. Summary of the Utility Model

[0005] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the utility model is how to provide a high-pressure butt-welding hydrogen energy ball valve structure with a simpler and more reasonable structural design, which can reduce the use cost and better maintain the working reliability.

[0006] To achieve the above object, the utility model provides a high-pressure butt-welding hydrogen energy ball valve structure, including a valve body. The valve body has an installation cavity inside. The two ends of the valve body are respectively provided with a medium channel that penetrates through and faces the installation cavity. At both ends of the installation cavity, valve seats are respectively installed. Between the two valve seats in the installation cavity, a valve core is installed through a valve rod. The valve core has a connection through hole horizontally penetrating through it and can connect the two medium channels. An actuator is provided above the valve body. The driving end of the actuator is connected to the valve rod and can drive the valve core to rotate so that the two medium channels are disconnected. And the two ends of the valve body respectively protrude outwards to form butt-welding convex pipes, and the medium channels are communicated with the butt-welding convex pipes. The characteristics are as follows: The valve body includes a main valve body in the middle, and side valve bodies are respectively connected and fixed on both sides of the main valve body. The installation cavity is arranged on the main valve body, the medium channel is arranged on the side valve body, and the butt-welding convex pipe is arranged at the outer end of the side valve body.

[0007] In this way, in the above-mentioned high-pressure butt-welding hydrogen energy ball valve structure, by designing the valve body part into an independent main valve body and side valve body; and arranging an installation cavity on the main valve body, a medium channel on the side valve body, and a butt-welding convex pipe at the outer end of the side valve body, on the one hand, the processing difficulty of the valve body can be reduced, which is convenient for processing and manufacturing; on the other hand, it is convenient to disassemble and replace damaged components, thereby reducing the use cost.

[0008] As an optimization, the side valve body is integrally designed in a cylindrical structure. The inner end of the side valve body forms a fitting section and is inserted and installed in the installation cavity of the main valve body. Two O-ring seals are arranged between the outer peripheral surface of the fitting section and the inner peripheral surface of the installation cavity; there is also a circular fixed flange in the middle of the side valve body, and the fixed flange is attached to the end face of the main valve body; a plurality of through holes are arranged on the main valve body in an array along the circumferential direction, fixing screws are arranged in the through holes, and both ends of the fixing screws respectively pass through the relief holes provided on the fixed flange to the outside, and fixing nuts are respectively arranged at both ends of the fixing screws, and the fixing nuts are attached and supported on the outside of the fixed flange.

[0009] In this way, the fitting connection between the side valve body and the main valve body is more reliable and more convenient for disassembly and assembly.

[0010] As an optimization, a chamfer structure is arranged on the outer side of the outer end of the butt-welding convex pipe.

[0011] In this way, it is more convenient for the butt-welding convex pipe to be welded to the pipeline.

[0012] As an optimization, a valve seat spring is arranged between the inner end of the fitting section and the valve seat, and the valve seat spring can push the valve seat to have a tendency to move horizontally towards the valve core.

[0013] In this way, through the valve seat spring arranged between the inner end of the fitting section and the valve seat, during the working process, the gap generated by the mutual rotation and friction between the valve seat and the valve core can be compensated, so that the working reliability can be better maintained.

[0014] As an optimization, the valve seat includes a front valve seat section, a middle valve seat section and a rear valve seat section; and the diameters of the front valve seat section, the middle valve seat section and the rear valve seat section are arranged to decrease in sequence; an O-ring seal is arranged between the middle part of the front valve seat section and the installation cavity; an O-ring seal is sleeved outside the middle valve seat section; a valve seat gasket is sleeved on the rear valve seat section, and the edge of the surface of the valve seat gasket protrudes inward to form a ring-shaped abutting protrusion and abuts and supports on the O-ring seal; and one end of the valve seat spring abuts and supports on the valve seat gasket.

[0015] In this way, the valve seat can better cooperate with the valve core and can better seal the valve seat.

[0016] As an optimization, an inclined chamfer structure is provided on the outer side of the front section of the valve seat so that at least a part of the front section of the valve seat has a frustum-shaped structure design.

[0017] In this way, a relief space can be formed, making the overall installation layout more convenient.

[0018] As an optimization, the inner hole of the valve seat includes a mating hole section with a spherical shape at the inner end, an intermediate connecting hole section, and a connecting hole section at the outer end, and the diameter of the connecting hole section is set to match the diameter of the medium passage.

[0019] In this way, the structural design of the inner hole of the valve seat is more reasonable, and after being matched with the valve core, it can better complete the connection and disconnection of the medium passage.

[0020] As an optimization, the valve stem includes an upper valve stem arranged vertically upward. There is an upper valve stem connection hole at the upper end of the valve core, and the lower end of the upper valve stem is inserted and fitted into the upper valve stem connection hole; on the valve body and directly opposite the upper valve stem, there is a relief hole for the upper valve stem to pass through to the outside, and a sealing structure is provided between the relief hole and the upper valve stem; on the upper side of the valve body, there is a horizontally arranged mounting support plate. The two sides of the mounting support plate are bent downward respectively to form connecting support plates and are respectively connected and fixed to both sides of the valve body; the actuator is installed on the mounting support plate, and the working end of the actuator passes through the through hole on the mounting support plate and is connected to the upper end of the upper valve stem.

[0021] In this way, the overall structural design is more reasonable, and it is more convenient to disassemble and assemble the actuator part.

[0022] As an optimization, the valve stem includes a lower valve stem arranged vertically downward. There is a lower valve stem connection hole at the lower end of the valve core, and the upper end of the lower valve stem is inserted and fitted into the lower valve stem connection hole; on the lower valve body and directly opposite the lower valve stem, there is a bottom cover opening, and a bottom cover is installed on the bottom cover opening. The bottom cover and the bottom cover opening are sealed by an O-ring and a gasket; there is a mounting hole on the bottom cover, and the lower end of the lower valve stem is installed in the mounting hole; and a lower valve stem bushing is provided between the lower valve stem and the mounting hole, and a lower valve stem wear-resistant gasket is provided between the lower end face of the lower valve stem and the bottom surface of the mounting hole.

[0023] In this way, it is more convenient to disassemble and assemble the bottom cover and the lower valve stem, and the bottom cover can be better protected.

[0024] Furthermore, an upper balance hole is provided on the bottom surface of the upper valve stem connection hole, and a lower balance hole is provided on the bottom surface of the lower valve stem connection hole, and the lower end of the upper balance hole and the upper end of the lower balance hole are respectively communicated with the connection through hole.

[0025] In this way, by designing the upper balance hole and the lower balance hole, the internal cavity pressure can be balanced, and after long-term operation, the torque can also be better maintained unchanged.

[0026] As an optimization, a mounting cylinder is arranged in the clearance hole, and a ring-shaped mounting flange is formed at the upper end of the mounting cylinder and is arranged on the valve body by screw connection; a mounting flange protruding inward is arranged at the lower end of the inner hole of the mounting cylinder, a mounting shoulder is arranged on the upper valve stem and corresponding to the lower side of the mounting flange, and a valve stem gasket is arranged between the mounting shoulder and the mounting flange; an upper valve stem sleeve is also sleeved on the upper valve stem, and the lower end of the upper valve stem sleeve is abutted against the upper side surface of the mounting flange; the sealing structure includes an O-shaped sealing ring and a sealing gasket arranged between the outer circumference of the mounting cylinder and the inner circumference of the clearance hole; it also includes a packing gasket, a lower packing, a middle packing, an upper packing and a packing pressure ring arranged in sequence on the upper valve stem sleeve; a packing pressure plate is also arranged above the packing pressure ring. The packing pressure plate is arranged on the mounting flange by screw connection; and an O-shaped sealing ring is respectively arranged between the inner circumference of the packing pressure ring and the upper valve stem, and between the outer circumference of the packing pressure ring and the inner circumference of the mounting cylinder.

[0027] In this way, the upper valve stem part can be disassembled and maintained as a whole, and the sealing structure is more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of a high-pressure butt-welded hydrogen energy ball valve in a specific implementation manner of the utility model.

[0029] Figure 2 yes Figure 1 Schematic diagram of the structure after rotation by an angle.

[0030] Figure 3 yes Figure 1 main view.

[0031] Figure 4 yes Figure 1 Bottom view of .

[0032] Figure 5 yes Figure 1 Left view of .

[0033] Figure 6 yes Figure 5 AA cross-sectional view of (the actuator is omitted in the figure).

[0034] Figure 7 yes Figure 6 A locally enlarged schematic diagram of position B in FIG.

[0035] Figure 8 yes Figure 6 Schematic diagram of a partial enlargement of the C position in FIG.

[0036] Figure 9 yes Figure 6 A locally enlarged schematic diagram of the D position in FIG. Detailed implementation mode

[0037] The present utility model will be further described below in conjunction with the drawings and embodiments. It should be noted that in the description of the present utility model, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific manner, so it cannot be understood as a limitation to the present utility model. Terms such as "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0038] As Figures 1 to 9 shown, a high-pressure butt-welding hydrogen energy ball valve structure includes a valve body 1. There is an installation cavity 2 inside the valve body. Medium channels 3 are respectively provided at both ends of the valve body and penetrate through the installation cavity. At both ends of the installation cavity, valve seats 4 are respectively installed. A valve core 5 is installed between the two valve seats in the installation cavity through a valve rod. The valve core has a connecting through hole 6 horizontally penetrating through it and can connect the two medium channels. An actuator 7 is provided above the valve body. The driving end of the actuator is connected to the valve rod and can drive the valve core to rotate so that the two medium channels are disconnected. And at both ends of the valve body, butt-welding convex pipes 8 protrude outwards respectively, and the medium channels are communicated with the butt-welding convex pipes. The valve body includes a main valve body 9 in the middle. On both sides of the main valve body, side valve bodies 10 are respectively connected and fixed. The installation cavity is provided on the main valve body. The medium channels are provided on the side valve bodies, and the butt-welding convex pipes are provided at the outer ends of the side valve bodies.

[0039] In this way, in the above high-pressure butt-welding hydrogen energy ball valve structure, by designing the valve body part into an independent main valve body and side valve bodies; and an installation cavity is provided on the main valve body, medium channels are provided on the side valve bodies, and butt-welding convex pipes are provided at the outer ends of the side valve bodies. On the one hand, the processing difficulty of the valve body can be reduced, which is convenient for processing and manufacturing; on the other hand, it is convenient to disassemble and replace damaged components, thereby reducing the use cost.

[0040] In this specific implementation mode, the side valve body is integrally designed in a cylindrical structure. The inner end of the side valve body forms a fitting section 11 and is inserted and installed in the installation cavity of the main valve body. Two O-ring seals are provided between the outer peripheral surface of the fitting section and the inner peripheral surface of the installation cavity. There is also a circular fixing flange 12 in the middle of the side valve body. The fixing flange is attached to the end face of the main valve body. A plurality of through holes are provided on the main valve body and arranged in an array along the circumferential direction. Fixing screws 13 are arranged in the through holes, and both ends of the fixing screws respectively pass through the relief holes provided on the fixing flange to the outside, and fixing nuts 14 are respectively provided at both ends of the fixing screws, and the fixing nuts are attached and supported on the outside of the fixing flange.

[0041] In this way, the matching connection between the side valve body and the main valve body is made more reliable and more convenient for disassembly and assembly.

[0042] In this specific implementation manner, a chamfered angle structure is provided on the outer side of the outer end of the butt-welded convex pipe.

[0043] In this way, the welding connection between the butt-welded convex pipe and the pipeline is more convenient.

[0044] In this specific embodiment, a valve seat spring 15 is provided between the inner end of the fitting section and the valve seat, and the valve seat spring is capable of pushing the valve seat to have a tendency to move horizontally toward the valve core.

[0045] In this way, by providing the valve seat spring between the inner end of the fitting section and the valve seat, the clearance generated by the mutual rotational friction between the valve seat and the valve core can be compensated during operation, thereby better maintaining the working reliability.

[0046] In this specific embodiment, the valve seat includes a valve seat front section 16, a valve seat middle section 17 and a valve seat rear section 18; and the diameters of the valve seat front section, the valve seat middle section and the valve seat rear section are arranged to decrease in sequence; an O-ring is arranged between the middle part of the valve seat front section and the installation cavity; an O-ring is sleeved on the outside of the valve seat middle section; a valve seat gasket 19 is sleeved on the valve seat rear section, and the edge of the valve seat gasket surface protrudes inward to form a circle of abutting protrusions 20 with an annular structure and abuts and supports on the O-ring; and one end of the valve seat spring abuts and supports on the valve seat gasket.

[0047] In this way, the valve seat can better cooperate with the valve core and can better seal the valve seat.

[0048] In this specific embodiment, a chamfered structure is provided on the outer side of the front section of the valve seat so that at least a partial length section of the front section of the valve seat is designed in a frustum-shaped structure.

[0049] In this way, a clearance space can be formed, making the overall installation layout more convenient.

[0050] In this specific embodiment, the inner hole of the valve seat includes a matching hole section with a spherical shape at the inner end, a connecting hole section in the middle and a connecting hole section at the outer end, and the diameter of the connecting hole section is matched with the diameter of the medium channel.

[0051] In this way, the structural design of the inner hole of the valve seat is more reasonable, and after cooperating with the valve core, the connection and disconnection of the medium channel can be better completed.

[0052] In this specific embodiment, the valve stem includes an upper valve stem 21 arranged vertically upward. An upper valve stem connection hole is provided at the upper end of the valve core, and the lower end of the upper valve stem is inserted and fitted into the upper valve stem connection hole. A relief hole is provided on the valve body opposite to the upper valve stem for the upper valve stem to pass through to the outside, and a sealing structure is provided between the relief hole and the upper valve stem. An installation support plate 22 arranged horizontally is provided on the upper side of the valve body. Both sides of the installation support plate are bent downward to extend to form connection support plates 23, which are respectively connected and fixed to both sides of the valve body. The actuator is installed on the installation support plate, and the working end of the actuator passes through the through hole on the installation support plate and is connected to the upper end of the upper valve stem.

[0053] In this way, the overall structural design is more reasonable, and it is more convenient to disassemble and assemble the actuator part.

[0054] In this specific embodiment, the valve stem includes a lower valve stem 24 arranged vertically downward. A lower valve stem connection hole is provided at the lower end of the valve core, and the upper end of the lower valve stem is inserted and fitted into the lower valve stem connection hole. A bottom cover opening is provided on the lower valve body opposite to the lower valve stem, and a bottom cover 25 is installed on the bottom cover opening. The bottom cover and the bottom cover opening are sealed by an O-ring and a gasket. An installation hole is provided on the bottom cover, and the lower end of the lower valve stem is installed in the installation hole. And a lower valve stem bushing 26 is provided between the lower valve stem and the installation hole, and a lower valve stem wear-resistant gasket 27 is provided between the lower end face of the lower valve stem and the bottom face of the installation hole.

[0055] In this way, it is more convenient to disassemble and assemble the bottom cover and the lower valve stem, and the bottom cover can be better protected.

[0056] Further, an upper balance hole 28 is provided on the bottom face of the upper valve stem connection hole, and a lower balance hole 29 is provided on the bottom face of the lower valve stem connection hole, and the lower end of the upper balance hole and the upper end of the lower balance hole are respectively communicated with the connection through hole.

[0057] In this way, by designing the upper balance hole and the lower balance hole, the internal cavity pressure can be balanced, and after long-term operation, the torque can be better maintained unchanged.

[0058] In this specific embodiment, an installation cylinder 30 is arranged in the relief hole. An annular installation flange 31 is formed at the upper end of the installation cylinder and is connected to the valve body by screws. An inwardly protruding installation flange 32 is arranged at the lower end of the inner hole of the installation cylinder. An installation shoulder 33 is arranged on the upper valve stem corresponding to the lower part of the installation flange. A valve stem washer 34 is arranged between the installation shoulder and the installation flange. An upper valve stem bushing 35 is also sleeved on the upper valve stem, and the lower end of the upper valve stem bushing abuts against the upper side surface of the installation flange. The sealing structure includes an O-ring and a sealing washer arranged between the outer peripheral surface of the installation cylinder and the inner peripheral surface of the relief hole. It also includes a packing gasket 36, a lower packing 37, a middle packing 38, an upper packing 39 and a packing gland 40 which are sequentially stacked above the upper valve stem bushing. A packing plate 41 is also arranged above the packing gland. The packing plate is connected to the installation flange by screws. And O-rings are respectively arranged between the inner peripheral surface of the packing gland and the upper valve stem and between the outer peripheral surface of the packing gland and the inner peripheral surface of the installation cylinder.

[0059] In this way, the upper valve stem part can be disassembled, assembled and maintained as a whole. And the sealing structure is more reliable.

[0060] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative labor. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field of the present invention through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. A high-pressure butt-welded hydrogen energy ball valve structure, comprising a valve body, an installation cavity inside the valve body, and medium channels are provided at both ends of the valve body and each of which is directly opposite to the installation cavity; valve seats are respectively installed at both ends of the installation cavity, and a valve core is installed between the two valve seats in the installation cavity through a valve stem; a connecting through hole is horizontally penetrated on the valve core and can connect the two medium channels; an actuator is provided above the valve body, and the driving end of the actuator is connected to the valve stem and can drive the valve core to rotate so that the two medium channels are disconnected; and both ends of the valve body protrude outward to form a butt-welded convex tube, so that the medium channel is connected to the butt-welded convex tube; it is characterized in that ； The valve body comprises a main valve body in the middle, and side valve bodies are respectively connected and fixed on both sides of the main valve body; the main valve body is provided with the installation cavity, the side valve body is provided with the medium channel, and the outer end of the side valve body is provided with the butt-welded convex pipe.

2. A high pressure butt welding hydrogen energy ball valve structure as claimed in claim 1, characterized in that: The side valve body is designed as a whole in a cylindrical structure. The inner end of the side valve body forms a fitting section and is inserted into the installation cavity of the main valve body. Two O-rings are arranged between the outer circumference of the fitting section and the inner circumference of the installation cavity. The middle part of the side valve body also has a circle of annular fixing flange, which is arranged in close contact with the end face of the main valve body. A plurality of through holes are arranged on the main valve body in an array along the circumferential direction, and fixing screws are arranged in the through holes, and the two ends of the fixing screws are respectively passed through the makeshift holes on the fixing flange to the outside, and fixing nuts are respectively arranged at both ends of the fixing screw, and the fixing nuts are supported in close contact with the outside of the fixing flange.

3. A high pressure butt welding hydrogen energy ball valve structure as claimed in claim 2, characterized in that: A chamfered angle structure is arranged on the outer side of the outer end of the butt-welded convex pipe.

4. A high pressure butt welding hydrogen energy ball valve structure as claimed in claim 2, characterized in that: A valve seat spring is arranged between the inner end of the matching section and the valve seat, and the valve seat spring is capable of pushing the valve seat to have a tendency to move horizontally toward the valve core.

5. A high pressure butt welding hydrogen energy ball valve structure as claimed in claim 4, characterized in that: The valve seat comprises a front section, a middle section and a rear section of the valve seat; and the diameters of the front section, the middle section and the rear section of the valve seat are arranged to decrease in sequence; an O-ring is arranged between the middle of the front section and the installation cavity; an O-ring is sleeved on the outside of the middle section of the valve seat; a valve seat gasket is sleeved on the rear section of the valve seat, and the edge of the surface of the valve seat gasket protrudes inward to form a circle of abutting protrusions with an annular structure and abuts and supports on the O-ring; and one end of the valve seat spring abuts and supports on the valve seat gasket.

6. A high pressure butt welding hydrogen energy ball valve structure as claimed in claim 5, characterized in that: A chamfered angle structure is arranged on the outside of the front section of the valve seat so that at least a partial length section of the front section of the valve seat is designed in a frustum-shaped structure.

7. A high pressure butt welding hydrogen energy ball valve structure as claimed in claim 1, characterized in that: The inner hole of the valve seat includes a matching hole section with a spherical surface at the inner end, a connecting hole section in the middle and a connecting hole section at the outer end, and the diameter of the connecting hole section is matched with the diameter of the medium channel.

8. A high pressure butt welding hydrogen energy ball valve structure as claimed in claim 1, characterized in that: The valve stem includes an upper valve stem arranged vertically upward, an upper valve stem connecting hole is arranged on the upper end of the valve core, and the lower end of the upper valve stem is inserted and fitted in the upper valve stem connecting hole; a clearance hole is arranged on the valve body and directly opposite to the upper valve stem so that the upper valve stem can pass through to the outside, and a sealing structure is arranged between the clearance hole and the upper valve stem; a horizontally arranged mounting support plate is arranged on the upper side of the valve body, and both sides of the mounting support plate are bent downward and extended to form a connecting support plate and are respectively connected and fixed on both sides of the valve body; the actuator is installed on the mounting support plate, and the working end of the actuator passes through the through hole on the mounting support plate and is connected to the upper end of the upper valve stem.

9. A high pressure butt welding hydrogen energy ball valve structure as claimed in claim 8, characterized in that: The valve stem includes a lower valve stem arranged vertically downward, a lower valve stem connecting hole is arranged at the lower end of the valve core, and the upper end of the lower valve stem is inserted and fitted in the lower valve stem connecting hole; a bottom cover opening is arranged on the lower valve body and directly opposite to the lower valve stem, a bottom cover is installed on the bottom cover opening, and the bottom cover and the bottom cover opening are sealed by an O-ring and a sealing gasket; a mounting hole is arranged on the bottom cover, and the lower end of the lower valve stem is installed in the mounting hole; and a lower valve stem sleeve is arranged between the lower valve stem and the mounting hole, and a lower valve stem anti-wear gasket is arranged between the lower end surface of the lower valve stem and the bottom surface of the mounting hole.

10. A high pressure butt welding hydrogen energy ball valve structure as claimed in claim 9, characterized in that: A mounting cylinder is arranged in the clearance hole, and a ring-shaped mounting flange is formed on the upper end of the mounting cylinder and is arranged on the valve body by screw connection; a mounting flange protruding inward is arranged at the lower end of the inner hole of the mounting cylinder, and a mounting shaft shoulder is arranged on the upper valve stem and corresponding to the lower part of the mounting flange, and a valve stem gasket is arranged between the mounting shaft shoulder and the mounting flange; an upper valve stem shaft sleeve is also sleeved on the upper valve stem, and the lower end of the upper valve stem shaft sleeve is abutted against the upper side surface of the mounting flange; the sealing structure includes an O-ring and a sealing gasket arranged between the outer circumference of the mounting cylinder and the inner circumference of the clearance hole; it also includes a packing gasket, a lower packing, a middle packing, an upper packing and a packing pressure ring which are stacked in sequence above the upper valve stem shaft sleeve; a packing pressure plate is also arranged above the packing pressure ring; and the packing pressure plate is arranged on the mounting flange by screw connection; and an O-ring is respectively arranged between the inner circumference of the packing pressure ring and the upper valve stem, and between the outer circumference of the packing pressure ring and the inner circumference of the mounting cylinder.

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