CN220600503U - Fluorine lining ball valve - Google Patents

Abstract

The utility model discloses a fluorine lining ball valve, which comprises a fluorine lining ball valve body consisting of a left valve body and a right valve body, wherein a valve core provided with a valve rod is arranged inside the fluorine lining ball valve body, the upper part of the valve rod is in sealing connection with the fluorine lining ball valve body through a valve top cover, and the bottom of the fluorine lining ball valve body is sealed through a valve bottom cover. The sealing seat lining fluorine layer that sets up on the sealing seat in lining fluorine ball valve body is close to case one side and is provided with annular spacing portion, and the sealing washer setting is in sealing seat lining fluorine layer spacing portion and sealing seat lining fluorine layer laminating, opposite side and case lining fluorine layer laminating, is provided with a plurality of location portions along spacing portion circumference on spacing portion and the sealing washer contact surface, and the corresponding position department of sealing washer is provided with the holding portion that matches with the location portion, and the location portion inserts in the holding portion. The utility model can effectively solve the problems of unreliable sealing performance, blockage caused by material conveying, grinding and valve damage, thereby ensuring the overall safety of the fluorine-lined ball valve.

Description

Fluorine lining ball valve

Technical Field

The utility model relates to the field of valves, in particular to a fluorine lined ball valve.

Background

Ball valve is a common valve, and the valve core is driven by the valve rod to rotate around the axis of the ball valve, so that the functions of cutting off, distributing and changing the flow direction of materials are realized. Ball valves are widely applied to industries such as petroleum refining, long-distance pipeline, chemical industry, papermaking, pharmacy, water conservancy, electric power, municipal administration, steel and the like, and take a significant role in national economy. The fluorine lining ball valve has reliable corrosion resistance and sealing performance and is mainly used for switching on and off strong corrosion materials such as acid and alkali in the production process. For example, when the conveyed material is a powder with strong corrosiveness, powder materials such as sodium persulfate and the like can form a corrosive air environment in a narrow space due to the strong corrosiveness, and equipment is easy to malfunction and damage.

The existing fluorine lining ball valve is easy to have the phenomena of loose sealing and the like in the actual use process, and has the problems that a valve core and a valve body have gaps, even too large gaps and the like in long-term use, so that the phenomenon of loose sealing occurs in the process of changing the on-off state of the valve. According to the research, as the valve core and the valve body in the fluorine-lined ball valve are both provided with the fluorine-lined layer made of polytetrafluoroethylene, and the sealing ring is also made of polytetrafluoroethylene, in the process that the operating mechanism drives the valve rod to drive the valve core to rotate to realize the on-off of a pipeline, the sealing ring is loosened or pulled out from the sealing seat due to overlarge friction force among the outer surface of the valve core, the sealing ring and the inner surface of the valve body, so that the overall tightness of the fluorine-lined ball valve is damaged.

In addition, as the fluorine lined ball valve has materials remained in the through hole of the valve core at the moment of closing the valve, particularly under the application scene of conveying hard particles or powder, the remained particles or powder can enter between the valve core and the valve body, and in the relative rotation process of the valve core and the valve body, the blocking and grinding effects are easy to cause, the valve is damaged and the sealing is not tight.

The utility model provides a patent of 202320820030.1 "dust crusting operating mode uses initiative self-cleaning hard seal ball valve", discloses a dust crusting operating mode uses initiative self-cleaning hard seal ball valve, which comprises a valve body, be equipped with disk seat, valve rod and the spheroid of being connected with the valve rod in the valve body, be equipped with self-cleaning structure on the disk seat, self-cleaning structure includes sweeps subassembly and cleaning subassembly, cleaning subassembly is including setting up at the inboard sealing seat of disk seat and spring holder, be equipped with the cavity that is used for holding the spring between sealing seat, spring holder, valve body and the disk seat, the spring holder other end and disk seat joint, be equipped with the annular on the disk seat with disk seat end part first protruding portion and second protruding portion, be equipped with the scraper with the laminating of spheroid surface on first protruding portion and the second protruding portion, the scraper is the back-and-forth arrangement, adopts the dual scraper structure of laminating sphere, and sharp dual scraper edge just initiatively clean the spheroid surface to the spheroid surface when opening and close the spheroid rotation, and does not scratch the spheroid surface. Above-mentioned patent has cleaned ball valve case surface through laminating spherical dual scraper structure, sets up the gas pocket in same position and has further improved the dust removal ability of valve. However, the residual fluid of the valve core is removed by adopting the scraper, and the surface of the part, which is in contact with the conveyed material, of the fluorine-lined ball valve is provided with the fluorine-lined layer, so that the means of removing the valve core and the purging component by adopting the scraper cannot be applied to the fluorine-lined ball valve lined with polytetrafluoroethylene due to overlarge friction force of the fluorine-lined layer.

Meanwhile, the scheme disclosed in the patent only cleans the outer surface of the valve core, but cannot treat the residual fluid in the valve core; when the valve is opened and closed, the technical problems that the sealing performance is affected and even the valve is damaged due to the fact that fluid in the through hole shakes down between the valve core and the valve body caused by the rotation movement of the valve core cannot be solved.

Disclosure of Invention

The utility model aims to provide a fluorine-lined ball valve, which can effectively solve the problem that a sealing ring in a sealing seat is loosened or separated from an installation position, thereby ensuring the integral tightness of the fluorine-lined ball valve.

The utility model adopts the following technical scheme:

the utility model provides a lining fluorine ball valve, includes lining fluorine ball valve body that left valve body and right valve body are constituteed, and the case setting that is provided with the valve rod is inside lining fluorine ball valve body, and the upper portion of valve rod passes through valve top cap and lining fluorine ball valve body sealing connection, and the bottom of lining fluorine ball valve body passes through the valve bottom lid and seals. The sealing seat lining fluorine layer that sets up on the sealing seat in lining fluorine ball valve body is close to case one side and is provided with annular spacing portion, and the sealing washer setting is in sealing seat lining fluorine layer spacing portion and sealing seat lining fluorine layer laminating, opposite side and case lining fluorine layer laminating, is provided with a plurality of location portions along spacing portion circumference on spacing portion and the sealing washer contact surface, and the corresponding position department of sealing washer is provided with the holding portion that matches with the location portion, and the location portion inserts in the holding portion.

Further, the positioning part adopts columnar bulges, and the accommodating part adopts matched columnar grooves.

The problem that the sealing ring is loose or pulled out from the sealing seat due to overlarge friction force on the contact surfaces of the valve core, the sealing ring and the valve body in the rotation process of the valve core of the fluorine-lined ball valve can be solved through the fitting of the sealing ring and the fluorine-lined layer limiting part of the sealing seat and the inserting of the columnar bulge and the columnar groove, and the tightness of the fluorine-lined ball valve is effectively ensured.

Further, the valve rod is coaxial with the valve core, and a through air injection channel is arranged on the valve rod and the valve core, and two ends of the air injection channel are respectively communicated with the atmosphere and the valve core through hole; a residue accommodating cavity is formed between the lower part of the valve core and the valve bottom cover, and an openable residue removing structure is arranged at the bottom of the residue accommodating cavity and used for discharging the residue out of the residue accommodating cavity, so that the residue in the residue accommodating cavity can smoothly enter the residue accommodating box, and the purpose of collecting the residue is achieved.

The lower part of the fluorine lining valve body is also provided with a detachable residual material accommodating box. The residual material removing structure is communicated with the inner cavity of the residual material accommodating box; the sealing structure is arranged at the joint of the residual material accommodating box and the valve body of the fluorine-lined ball valve and is used for collecting and accommodating residual materials separated from the valve core, so that the cleaning period of the residual materials in the valve core is prolonged, and the influence of frequent cleaning on the material conveying efficiency is reduced.

Further, a quick connector externally connected with an air source is arranged at the opening of the air injection channel at the upper part of the valve rod; the lower opening part of the valve core gas injection channel is provided with a one-way valve mounting piece made of polytetrafluoroethylene, and the one-way valve is arranged at the lower part of the gas injection channel in the valve core through the one-way valve mounting piece so as to perform a good one-way sealing function on the gas injection channel and prevent the overflow of conveyed materials in the working process. The one-way valve mounting piece made of polytetrafluoroethylene has good anti-corrosion effect.

Further, the lower part of the valve core is also coaxially provided with a valve core shaft, a rotating bearing is arranged in the residual material accommodating cavity, the valve core shaft is rotationally connected with the valve body of the fluorine-lined ball valve through the rotating bearing, the valve core shaft is a stepped shaft, the shaft shoulder of the valve core shaft is attached to the upper surface of the inner ring of the rotating bearing, and the lower end of the valve core shaft is connected with the inner ring of the rotating bearing. The arrangement of the stepped shaft can further improve the working stability of the valve core.

Further, the rotary bearing is arranged in the bearing seat, the bearing seat is arranged below the valve bottom cover, the lower section of the valve core shaft passes through the valve bottom cover through a valve core shaft passing hole, the valve core shaft passes through the valve bottom cover and is arranged in the rotary bearing inner ring below the valve bottom cover, and the valve core shaft passing hole is internally provided with a valve bottom cover sealing ring.

Further, the residual material removing structure comprises a rotary material discharging disc coaxially and fixedly arranged on the valve mandrel, the rotary material discharging disc is attached to the valve bottom cover, a plurality of material discharging disc through holes are formed in the rotary material discharging disc along the circumferential direction, and a plurality of valve bottom cover through holes are correspondingly formed in the valve bottom cover. When the valve core rotates to a cut-off state under the drive of the valve rod, the through holes of the discharge disc and the through holes of the valve bottom cover are correspondingly conducted, and meanwhile, when the valve core rotates to a conducting state under the drive of the valve rod, any two through holes of the discharge disc and the through holes of the valve bottom cover are in a staggered state and are not conducted. At this time, the residual material accommodating cavity is communicated with the residual material accommodating box, so that the purpose of transferring residual materials from the residual material accommodating cavity to the residual material accommodating box is achieved.

In the utility model, when the fluorine-lined ball valve is conducted, any two through holes of the discharge disc and the through holes of the valve bottom cover are in a staggered state and are not conducted, so that the tightness of the fluorine-lined ball valve can be effectively ensured, and the residual material containing cavity can also collect and store residual materials.

When the fluorine lining ball valve is in a cut-off state, an external air source quick connector is arranged through the valve rod, an air injection channel is arranged on the valve rod and communicated with the valve core, and a one-way valve is used for injecting gas with certain pressure into the valve core through hole to form air flow, so that the air flow drives residual conveying materials (including powder or fluid) to enter the residual material accommodating cavity through a gap between the valve core and the valve body side, and the cleaning work of the fluorine lining ball valve is primarily completed.

Further, the valve bottom cover through hole on the valve bottom cover is correspondingly communicated with the discharge disc through hole on the rotary discharge disc, and residual conveying materials (including powder or fluid) in the residual material accommodating cavity flow into the detachably connected residual material accommodating box arranged at the lower part of the valve body, so that the cleaning work of the fluorine-lined ball valve is continuously finished by cleaning the detachably connected residual material accommodating box at regular intervals, and finally, the problems of blockage, grinding and valve damage caused by the fact that the conveying materials (including powder or fluid) remain among the valve core, the sealing ring and the valve body are solved, and the integral safety of the fluorine-lined ball valve is ensured.

Drawings

FIG. 1 is a cross-sectional view of the present utility model;

FIG. 2 is a schematic view of an air injection channel according to the present utility model;

FIG. 3 is a schematic diagram of the connection relationship between a seal seat fluorine-lined layer and a seal ring in the utility model;

FIG. 4 is a schematic view of a valve bottom cover according to the present utility model;

FIG. 5 is a schematic view of the position of a rotary discharge tray according to the present utility model;

FIG. 6 is a schematic diagram of a rotary discharge tray reject mechanism according to the present utility model.

1, a left valve body; 101, a sealing seat; 102, a limit part of a seal seat; 103 sealing seat lining fluorine layer; 2 valve top cover; 3, an air cleaning component; 301 external air source quick connector; 302 an air injection channel; 303 a one-way valve; 304 a check valve mount; a right valve body; 5, sealing rings; 6, valve rod; 7, a valve core; 8, a valve core shaft; 9, a valve bottom cover; 901 valve bottom cover through hole; 902 valve bottom cover sealing ring; 10, a rotating bearing; 11 bearing seats; 12, rotating a discharge disc; 13 through holes of the discharge disc; 14 a residue holding box.

Detailed Description

The utility model is described in detail below with reference to the attached drawings and examples:

as shown in fig. 1 to 6, the fluorine lined ball valve comprises a fluorine lined ball valve body consisting of a left valve body 1 and a right valve body 4, wherein a valve rod 6 is arranged at the upper part of a valve core 7, the valve core 7 is arranged inside the fluorine lined ball valve body, the upper part of the valve rod 6 is in sealing connection with the fluorine lined ball valve body through a valve top cover 2, and the bottom of the fluorine lined ball valve body is sealed through a valve bottom cover 9. The rotation of the valve rod 6 drives the valve core 7 to synchronously rotate in a valve cavity formed by the left valve body 1 and the right valve body 4, so that the on-off function of controlling material conveying is achieved.

In the utility model, the opposite sides of the left valve body 1 and the right valve body 4 are respectively provided with a conveying channel for materials to pass through, the section of the conveying channel is matched with the section of a valve core through hole, and most of the conveying channels are cylindrical channels; the openings of the conveying channels on the left valve body 1 and the right valve body 4 are provided with sealing seats 101 in the valve bodies of the fluorine-lined ball valves; in order to realize the conveying function of the strong corrosive materials, a sealing seat fluorine lining layer 103 is arranged on a sealing seat 101 in the fluorine lining ball valve body. An annular limiting part is arranged on one side of the sealing seat fluorine lining layer 103, which is close to the valve core 7, and is used for limiting the sealing ring 5; the sealing ring 5 is arranged in the limiting part of the sealing seat fluorine lining layer 103, one side of the sealing ring 5 is tightly attached to the sealing seat fluorine lining layer 103, and the other side is attached to the valve core fluorine lining layer. The joint surface of the sealing ring 5 and the sealing seat fluorine lining layer 103 can be an inclined surface so as to achieve a better limiting effect.

In order to further ensure the position stability of the sealing ring 5, a plurality of positioning parts are arranged on the contact surface of the limiting part and the sealing ring 5 along the circumferential direction of the limiting part, accommodating parts matched with the positioning parts are arranged at corresponding positions on the sealing ring 5, and the positioning parts are inserted into the accommodating parts. In this embodiment, the positioning portion adopts a columnar protrusion, and the accommodating portion adopts a columnar recess adapted.

According to the utility model, the annular limiting part is arranged on the sealing seat fluorine-lined layer 103 to limit the sealing ring 5, and the positioning part and the accommodating part which are matched are used, so that the sealing ring 5 and the sealing seat fluorine-lined layer 103 are prevented from rotating circumferentially, and the position stability of the sealing ring 5 and the sealing seat fluorine-lined layer 103 is further improved. The design can effectively overcome the problem that the sealing ring 5 is loose or pulled out of the sealing seat due to overlarge friction force of the contact surface of the valve core 7, the sealing ring 5 and the sealing seat fluorine lining layer 103 in the rotating process of the valve core 7 of the fluorine lining ball valve, thereby effectively ensuring the tightness of the fluorine lining ball valve.

Considering that fluid remains in the through hole of the valve core at the closing moment of the fluorine-lined ball valve, particularly in the application scene of conveying hard particles or powder, the residual particles or powder can enter between the valve core 7 and the valve body, and the problems of damage and loose sealing of the valve caused by blockage and grinding effect easily occur in the relative rotation process of the valve core 7 and the valve body are solved, therefore, the utility model also provides a related structure for realizing the cleaning function of the interior of the fluorine-lined ball valve.

In the utility model, a valve rod 6 and a valve core 7 are coaxially arranged, a through air injection channel 302 is arranged on the valve rod 6 and the valve core 7, and the upper end and the lower end of the air injection channel 302 are respectively communicated with the atmosphere and a valve core through hole; a residue accommodating cavity is formed between the lower part of the valve core 7 and the valve bottom cover 9, and an openable residue removing structure is arranged at the bottom of the residue accommodating cavity.

Because the fluorine lining ball valve rotates to the closed position along with the valve core 7 in the use process, the outer surfaces of the two sides of the valve core 7 which are not provided with the valve core 7 through holes respectively form a sealing effect on the openings of the conveying channels of the left valve body 1 and the right valve body 4, and a larger gap is formed between the openings of the two sides of the valve core through holes on the valve core 7 and the inner surface of the valve cavity, at the moment, materials remained in the valve core through holes can enter between the valve core 7 and the valve body through the gap, and the blocking and grinding effects are caused. Therefore, in the utility model, through the through gas injection channel 302 arranged on the valve rod 6 and the valve core 7, gas with certain pressure is injected into the valve core through hole through the gas injection channel 302 by using an external gas source, residual materials in the valve core through hole are cleaned by using the formed gas flow, the residual materials enter a residual material accommodating cavity formed between the lower part of the valve core 7 and the valve bottom cover 9, and then the residual materials are discharged through the openable and closable residual material discharging structure arranged at the bottom of the residual material accommodating cavity.

In this embodiment, a detachable residue accommodating box 14 may be further disposed at the lower portion of the fluorine lined valve body, for collecting and accommodating the residue detached from the valve core 7, so as to prolong the cleaning period of the residue in the valve core 7, and reduce the influence of frequent cleaning on the material conveying efficiency. The residual material accommodating cavity is communicated with the inner cavity of the residual material accommodating box 14 through the residual material removing structure, so that the residual materials in the residual material accommodating cavity can smoothly enter the residual material accommodating box 14, and the purpose of collecting the residual materials is achieved. In order to prevent the leakage of the residual materials, the utility model is also provided with a sealing structure at the joint of the residual material accommodating box 14 and the fluorine-lined ball valve body, so as to further strengthen the sealing effect of the joint of the residual material accommodating box 14 and the fluorine-lined ball valve body.

In this embodiment, in order to further improve the effect of the cleaning function inside the fluorine lined ball valve, an external air source quick connector 301 is disposed at the upper opening of the air injection channel 302 at the upper part of the valve rod 6, so as to achieve the effect of quickly connecting an external air source, and reduce the working strength of operators; meanwhile, a one-way valve 303 is arranged at the lower part of the air injection channel 302 in the valve core 7 so as to perform a good one-way sealing function on the air injection channel 302 and prevent the materials from overflowing during the working process. The check valve 303 is installed and fixed through the check valve installation piece 304 arranged at the opening of the lower part of the gas injection channel 302 in the valve core 7, and in order to ensure the service lives of the check valve 303 and the check valve installation piece 304, the check valve installation piece 304 is made of polytetrafluoroethylene, so that the check valve has good anti-corrosion effect. The air cleaning assembly 3 is formed by the external air source quick connector 301, the air injection channel 302, the one-way valve 303 and the one-way valve mounting piece 304, air is injected into the air injection channel 302 by the external air source through the quick connection of the external air source, the formed air flow is conducted in a one-way manner to the one-way valve 303, and the air flow is continuously injected into the valve core through hole through the through hole of the one-way valve mounting piece 304, so that the residual conveying materials (including powder or fluid) are cleaned.

Due to frequent rotation of the valve rod 6 and the valve core 7, the valve rod 6 can deviate, so that the sealing performance of the fluorine lined ball valve is reduced; for this purpose, the utility model also coaxially arranges a valve core shaft 8 at the lower part of the valve core 7, a rotating bearing 10 is arranged in the residual material accommodating cavity, and the valve core shaft 8 is rotationally connected with the valve body of the fluorine-lined ball valve through the rotating bearing 10. The valve rod 6, the valve core 7 and the valve core shaft 8 are all kept coaxial, and the valve rod 6 and the valve core shaft 8 form an upper supporting rotating structure and a lower supporting rotating structure, so that the rotating stability of the valve core can be further ensured.

In the embodiment, the lower end of the valve core shaft 8 is a stepped shaft, and the shaft shoulder of the valve core shaft 8 is attached to the upper surface of the inner ring of the rotary bearing to play roles in supporting and axial positioning; the lower end of the valve core shaft 8 is connected with the inner ring of the rotary bearing to realize circumferential positioning and rotation. The arrangement of the stepped shaft can further improve the working stability of the valve core.

In this embodiment, the rotary bearing 10 is disposed in the bearing housing 11, the bearing housing 11 is disposed below the valve bottom cover 9, the lower end of the valve core shaft 8 passes through the valve bottom cover 9 through the valve core shaft passing hole and is disposed in the rotary bearing inner ring below the valve bottom cover 9, and the valve core shaft 8 in the valve core shaft passing hole is provided with the valve bottom cover sealing ring 902.

And the residual material discharging structure is used for realizing the transfer of residual materials from the residual material accommodating cavity to the residual material accommodating box 14 according to the set residual material discharging time. Since the fluorine lined ball valve is in the on state, if the cullet containment chamber is in communication with the cullet containment box 14, leakage of the material being conveyed may result. Therefore, in the utility model, the residual material discharging time is set to be in a cut-off state of the fluorine lining ball valve, and at the moment, the conduction between the residual material accommodating cavity and the residual material accommodating box 14 is realized, so that the purpose of transferring the residual material from the residual material accommodating cavity to the residual material accommodating box 14 is achieved.

In the utility model, the functions are realized through a special residue removing structure; that is, the residue removing structure comprises a rotary discharge disc 12 coaxially and fixedly arranged on a valve mandrel 8, the rotary discharge disc 12 is attached to a valve bottom cover 9, a plurality of discharge disc through holes 13 are circumferentially arranged on the rotary discharge disc 12, a plurality of valve bottom cover through holes 901 are correspondingly arranged on the valve bottom cover 9, when a valve core is driven by a valve rod 6 to rotate to a cut-off state, the discharge disc through holes 13 are correspondingly conducted with the valve bottom cover through holes 901, and when the valve core is driven by the valve rod 6 to rotate to a conducting state, any two discharge disc through holes 13 and the valve bottom cover through holes 901 are in a staggered state and are not conducted.

When the fluorine lining ball valve is in a cut-off state, a valve bottom cover through hole 901 on the valve bottom cover 9 is correspondingly communicated with a discharge disc through hole 13 on the rotary discharge disc 12, and residual materials (including powder or fluid) in the residual material accommodating cavity flow into a residual material accommodating box 14 which is detachably connected and is arranged at the lower part of the valve body; when the fluorine lined ball valve is in a conducting state, any two valve bottom cover through holes 901 and the discharge disc through holes 13 are in a staggered state and are not conducted; at this time, the residual materials in the valve core through holes enter and are stored in the residual material accommodating cavity.

In the use process of the fluorine lining ball valve, the annular limiting part on the sealing seat fluorine lining layer 103 can well limit the sealing ring 5, and the matching of the positioning part and the containing part and the inclined surface joint surface of the sealing ring 5 and the sealing seat fluorine lining layer 103 can further strengthen the positioning effect so as to prevent the sealing ring 5 from loosening or being pulled out from the sealing seat 101.

When the fluorine lined ball valve is closed, residual materials in the valve core through holes enter the residual material accommodating cavity through gaps between openings at two sides of the valve core through holes and the inner surface of the valve cavity; at this time, the external air source quick connector 301 can be used to connect with the external air source, air with a certain pressure is injected into the valve core through hole, and the formed air flow is used to sweep the residual material in the valve core through hole, so that the residual material enters the residual material accommodating cavity.

Because the material discharge disc through hole 13 is correspondingly communicated with the valve bottom cover through hole 901 when the fluorine-lined ball valve is closed, residual materials in the residual material accommodating cavity can smoothly enter the detachable residual material accommodating box 14 through the material discharge disc through hole 13 and the valve bottom cover through hole 901, and staff can clean the residual materials stored in the residual material accommodating box 14 regularly, so that the cleaning work of the fluorine-lined ball valve is finally realized.

Because lining fluorine ball valve when switching on, two arbitrary bin drain pan through-holes 13 all are located stagger state and all do not switch on with valve bottom lid through-hole 901, can effectively guarantee lining fluorine ball valve's leakproofness this moment, and the collection storage to the residual material can also be realized to the residual material holding chamber.

Claims (10)

1. The utility model provides a lining fluorine ball valve, includes the lining fluorine ball valve body of constituteing by left valve body and right valve body, and the case rotation that is provided with the valve rod sets up inside lining fluorine ball valve body, and the upper portion of valve rod passes through valve top cap and lining fluorine ball valve body sealing connection, and the bottom of lining fluorine ball valve body passes through valve bottom lid and seals its characterized in that: the sealing seat in the valve body of the fluorine-lined ball valve is provided with a sealing seat fluorine-lined layer, one side of the sealing seat fluorine-lined layer, which is close to the valve core, is provided with an annular limiting part, the sealing ring is arranged in the limiting part of the sealing seat fluorine-lined layer and is attached to the sealing seat fluorine-lined layer, the contact surface of the limiting part and the sealing ring is provided with a plurality of positioning parts along the circumferential direction of the limiting part, the corresponding position of the sealing ring is provided with a containing part which is matched with the positioning part, and the positioning part is inserted in the containing part.

2. The fluorine lined ball valve of claim 1, wherein: the positioning part adopts columnar bulges, and the accommodating part adopts columnar grooves which are matched.

3. The fluorine lined ball valve of claim 1, wherein: the valve rod and the valve core are coaxially arranged, a through air injection channel is further arranged on the valve rod and the valve core, and two ends of the air injection channel are respectively communicated with the atmosphere and the valve core through hole; a residue accommodating cavity is formed between the lower part of the valve core and the valve bottom cover, and an openable residue removing structure is arranged at the bottom of the residue accommodating cavity.

4. A fluorine lined ball valve according to claim 3, wherein: the lower part of the valve body of the fluorine-lined ball valve is also detachably connected with a residual material accommodating box; the residual material removing structure is communicated with the inner cavity of the residual material accommodating box; the joint of the residual material accommodating box and the valve body of the fluorine-lined ball valve is provided with a sealing structure.

5. A fluorine lined ball valve according to claim 3, wherein: an external air source quick connector is arranged at the upper opening of the air injection channel at the upper part of the valve rod; the valve core is internally provided with a valve core, and the valve core is internally provided with a valve core.

6. The fluorine lined ball valve of claim 5, wherein: the one-way valve mounting piece is made of polytetrafluoroethylene.

7. A fluorine lined ball valve according to claim 3, wherein: the lower part of the valve core is also coaxially provided with a valve core shaft, a rotating bearing is arranged in the residual material accommodating cavity, and the valve core shaft is rotationally connected with the valve body of the fluorine-lined ball valve through the rotating bearing.

8. The fluorine lined ball valve of claim 7, wherein: the structure is got rid of to incomplete material including coaxial fixed setting at the epaxial rotation bin drain pan of valve, rotate bin drain pan and valve bottom laminating, be provided with a plurality of bin drain pan through-holes along circumference on the rotation bin drain pan, correspond on the valve bottom and be provided with a plurality of valve bottom through-holes, and the case rotates to the off-state under the valve rod drive, the bin drain pan through-hole is switched on with the valve bottom through-hole corresponds, and the case rotates to the on-state under the valve rod drive, arbitrary two bin drain pan through-holes all are located stagger state and all do not switch on with the valve bottom through-hole.

9. The fluorine lined ball valve of claim 7, wherein: the lower end of the valve core shaft is a stepped shaft, the shaft shoulder of the valve core shaft is attached to the upper surface of the inner ring of the rotary bearing, and the lower end of the valve core shaft is connected with the inner ring of the rotary bearing.

10. The fluorine lined ball valve of claim 9, wherein: the rotary bearing is arranged in the bearing seat, the bearing seat is arranged below the valve bottom cover, the lower end of the valve core shaft passes through the valve bottom cover through a valve core shaft passing hole and is arranged at the inner ring of the rotary bearing below the valve bottom cover, and the valve core shaft in the valve core shaft passing hole is provided with a valve bottom cover sealing ring.