Three-piece type high-pressure ball valve with lock

Abstract

The three-piece type high-pressure ball valve structure with the lock comprises a valve body and connectors symmetrically arranged on the left side and the right side of the valve body, a ball core is arranged in the valve body, a valve rod is connected to the top of the ball core in an inserted mode, and valve seats matched with the ball core are arranged on the left side and the right side of the valve body respectively. The left side and the right side of the valve body are each provided with a sealing ring, and the sealing rings and the valve seats are coaxially arranged. Through the arrangement of the annular cavity, the first elastic piece, the first flow channels, a piston column, a movable plate and the like, when the valve is in a closed state, the pressure of the liquid inlet end is increased, a belleville spring gets close to a ball core, the first elastic piece deforms, and hydraulic oil in an extrusion cavity and the annular cavity enters the multiple first flow channels; the multiple piston columns move towards the outer side and extrude the sealing ring, the sealing effect on the two sides of the sealing ring can be enhanced at the same time after the sealing ring is deformed, and the higher the pressure in the valve is, the better the sealing performance of the valve body and the connector is.

Description

Technical Field

[0001] The present invention relates to the technical field of ball valves, and more particularly to a three-piece high-pressure ball valve with a lock. Background Art

[0002] The three-piece ball valve is a special structure of the ball valve, which consists of three main parts: two ends and a middle body. This design allows the valve to be maintained or the internal parts, such as the ball, valve seat, etc., to be replaced without being removed from the pipeline. Using a ball valve with a lock can avoid misoperation due to negligence or misunderstanding.

[0003] During the use of the three-piece ball valve, a sealing surface is formed between the ball and the valve seat. If the ball valve is not operated for a long time, it may cause the ball and the valve seat to get stuck, making the valve difficult to open or close. If the medium contains sand, colloid or other fine particles, these substances may be deposited between the ball and the valve seat during the valve closing period, forming an obstruction. When trying to open the valve, these deposits will provide additional resistance when the ball starts to rotate.

[0004] Severe blockage may cause the ball to not rotate completely into place, making the valve unable to be completely closed or opened, thereby destroying its sealing function and causing medium leakage. At the same time, forcibly operating a blocked valve may damage the internal components of the valve, such as the valve stem, actuator, bearings, etc., increasing maintenance costs and time.

[0005] The Chinese patent application number 202210656703.4 discloses a sanitary three-piece ball valve; by setting a cleaning device, the cleaning liquid passes through the water inlet pipe, the U-shaped cleaning pipe, the U-shaped cleaning tank and the drain pipe in sequence, so as to clean the surface of the valve ball without disassembling the valve body for cleaning, thereby improving the internal sanitation performance of the valve. However, the ball valve still has at least the following problems: 1. Although cleaning the impurities on the ball core can reduce the blockage between the valve seat and the ball core to a certain extent, the blockage between the valve seat and the ball core is not only caused by impurities; when the ball valve is in a closed state, the contact surface between the ball and the valve seat may generate a large static friction force, which needs to be overcome when the ball starts to rotate, so it will cause a large blockage feeling in the initial stage.

[0006] 2. Although the three-piece ball valve is designed with good sealing performance, over time, due to factors such as medium corrosion, wear, pressure changes and temperature changes, the sealing ring may age or be damaged, causing leakage; and the connection part is a weak point of the three-piece ball valve, especially in high-pressure environments, these joints may become leakage points.

[0007] Therefore, the present invention proposes a three-piece high-pressure locking ball valve to solve the above problems. Summary of the invention

[0008] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a three-piece high-pressure locking ball valve, which solves the problems raised in the above-mentioned background technology by providing a sealing mechanism and an auxiliary mechanism.

[0009] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a three-piece high-pressure locked ball valve, comprising a valve body and joints symmetrically arranged on the left and right sides thereof, a ball core is arranged in the valve body, a valve stem is inserted on the top of the ball core, the valve stem passes through the top of the valve body, valve seats matching the ball core are arranged on the left and right sides of the valve body, butterfly springs are arranged on the sides of the two valve seats away from the ball core, sealing rings coaxially arranged with the valve seats are arranged on the left and right sides of the valve body, and further comprising: A sealing mechanism is arranged in the valve seat, and includes an annular cavity opened in the valve seat, a first elastic member in contact with a butterfly spring is arranged on one side of the valve seat, the first elastic member and the valve seat form an extrusion cavity, the extrusion cavity is connected with the annular cavity, a plurality of circumferentially evenly distributed first annular grooves are arranged on the circumferential side of the valve seat, a movable plate is arranged in the first annular groove, a first flow channel connected with the plurality of annular cavities is arranged in the valve seat, one end of the first flow channel away from the annular cavity is connected with the first annular groove, and a piston column is sealingly and slidably connected in the first flow channel, and a fluid medium is arranged in the annular cavity and the first elastic member.

[0010] Preferably, a second flow channel is opened inside the valve seat, and two ends of the second flow channel are respectively connected to the annular cavity and the extrusion cavity.

[0011] Preferably, the first annular groove is located in the middle of the sealing ring.

[0012] Preferably, the contact surface between the valve seat and the ball core is a sealing surface, and the sealing mechanism also includes a plurality of movable grooves opened on the sealing surface, the plurality of movable grooves are evenly distributed in a circle along the axis of the valve seat, an arc plate is sealingly and slidingly connected in the movable groove, and a third flow channel is opened between the annular cavity and the plurality of movable grooves.

[0013] Preferably, an auxiliary mechanism is further included, and the auxiliary mechanism is arranged in the ball core and the valve stem. When the auxiliary mechanism is activated, the arc plate slides into the movable groove, so that the arc plate is out of contact with the ball core.

[0014] Preferably, the auxiliary mechanism comprises a second annular groove opened on the surface of the ball core, the number of the second annular grooves is four and they are matched with the sealing surface of the valve seat respectively, a second elastic member is fixedly connected in the second annular groove, a compression mechanism coaxially arranged with the valve stem is arranged on the ball core, a fourth flow channel is opened in two second annular grooves at the same height as the compression mechanism, and the fourth flow channel is connected with the compression mechanism, and a fifth flow channel is arranged between the two second annular grooves symmetrically arranged in the upper and lower parts; A compression piece is coaxially arranged inside the valve stem, and fluid medium is arranged inside the compression mechanism, the second annular groove, the fourth flow channel and the fifth flow channel. When the compression piece moves downward, the fluid medium in the compression mechanism flows into the four second annular grooves, the second elastic piece is deformed and the arc plate is out of contact with the ball core.

[0015] Preferably, the compression mechanism includes a central cavity opened in the ball core, the central cavity is coaxially arranged with the valve stem, a piston plate is sealingly and slidably connected in the central cavity, a fixing column is coaxially fixed on the piston plate, a slot is provided on the top of the ball core, the valve stem is inserted into the slot, one end of the fixing column away from the piston plate passes through the slot, and an elastic reset part is provided between the piston plate and the central cavity.

[0016] Preferably, the compression member includes a connecting rod coaxially arranged with the valve stem, a through hole coaxially opened in the valve stem, the connecting rod is threadedly connected to the through hole, a through groove is opened at one end of the valve stem close to the slot, the end of the connecting rod close to the ball core is located in the through groove, and a handle is provided at the end of the connecting rod extending out of the valve stem.

[0017] Preferably, a handle is fixedly connected to the top end of the valve stem, a connecting piece is provided on the valve stem, a fixing piece is provided on one of the joints, and locking holes are provided on the connecting piece and the fixing piece.

[0018] Preferably, a sealing filler is provided between the valve body and the valve stem, and a plastic sleeve is provided on the handle.

[0019] Technical effects and advantages of the present invention: The present invention is provided with an annular cavity, a first elastic member, a first flow channel, a piston column and a movable plate. When the valve is in a closed state, the pressure at the liquid inlet end increases and causes the butterfly spring to move closer to the ball core, the first elastic member is deformed and causes the hydraulic oil in the extrusion cavity and the annular cavity to enter the plurality of first flow channels, and the plurality of piston columns move outward and squeeze the sealing rings. Since the first annular groove is located in the middle of the sealing ring, when the movable plate squeezes the sealing ring, the sealing ring is deformed and can simultaneously enhance the sealing effect on both sides thereof. The greater the pressure in the valve, the better the sealing performance of the valve body and the joint, which effectively prevents leakage of the valve body and the joint due to aging or damage of the sealing ring.

[0020] The present invention arranges an annular cavity, a third flow channel, a movable groove and an arc plate, so that the arc plate moves as the pressure in the valve body increases, thereby increasing the contact force between the arc plate and the ball core. When the contact force between the arc plate and the ball core is greater, the sealing between the valve seat and the ball core is better, and the impurities in the sealing surface are less, which not only improves the sealing between the valve seat and the ball core, but also avoids a greater sense of blockage between the valve seat and the ball core when the worker turns the valve stem due to a large number of residual impurities.

[0021] The present invention is provided with a central cavity, a connecting rod, a second annular groove and a second elastic member. When a worker turns the handle, he feels a greater sense of blockage. The hydraulic oil in the central cavity is transported to the four second annular grooves by rotating the connecting rod. As the pressure in the second annular groove increases, the second elastic member is deformed and the corresponding arc plate is out of contact with the ball core, thereby reducing the contact area between the valve seat and the ball core, thereby reducing the static friction between the two, and improving the sense of blockage during the initial rotation of the valve stem. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic plan cross-sectional view of the valve of the present invention when it is in an open state; Figure 3 It is a schematic plan cross-sectional view of the valve of the present invention when it is in a closed state; Figure 4 It is a schematic diagram of the cooperation between the ball core and the valve seat of the present invention; Figure 5 It is a disassembled schematic diagram of the valve stem, ball core and valve seat of the present invention; Figure 6 It is a schematic plan cross-sectional view of the valve seat of the present invention; Figure 7 For the present invention Figure 6 A schematic diagram of the structure enlargement at the center A; Figure 8 It is a schematic plan cross-sectional view of the ball core and the valve seat of the present invention; Fig. 9 For the present invention Figure 8 A schematic diagram of the structure enlarged at B in the middle; Fig.10 Schematic diagram of the structure of the ball core of the present invention; Fig.11 It is a schematic plan cross-sectional view of the compression mechanism of the present invention; Fig.12 It is a schematic diagram of the cooperation between the valve stem and the compression member of the present invention.

[0023] The accompanying drawings are marked as follows: 1. Valve body; 11. Butterfly spring; 12. Sealing ring; 2. Connector; 3. Ball core; 31. Slot; 4. Valve stem; 5. Valve seat; 6. Sealing mechanism; 61. Annular cavity; 62. First elastic member; 63. Extrusion cavity; 64. Movable plate; 65. First flow channel; 66. Piston column; 67. Second flow channel; 68. Movable groove; 681. Arc plate; 69. Third flow channel; 7. Auxiliary mechanism; 71. Second annular groove; 72. Second elastic member; 73. Compression mechanism; 731. Central cavity; 732. Piston plate; 733. Fixed column; 734. Elastic reset member; 74. Fourth flow channel; 75. Fifth flow channel; 76. Compression member; 761. Connecting rod; 762. Through groove; 8. Handle; 9. Connecting piece; 91. Fixing piece. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Embodiment 1 In the actual production process, although the design of the three-piece ball valve has good sealing performance, over time, due to factors such as medium corrosion, wear, pressure changes and temperature changes, the sealing ring ages or is damaged, which causes leakage; and the connection part is a weak point of the three-piece ball valve, especially in a high-pressure environment, these joints may become leakage points. This embodiment is specially invented to solve the above problems.

[0026] See also Figures 1 to 12 As shown, a three-piece high-pressure locked ball valve according to an embodiment of the present invention comprises a valve body 1 and joints 2 symmetrically arranged on the left and right sides thereof, the two joints 2 being flange-connected to the valve body 1, and the two joints 2 being sealedly connected to the liquid inlet pipe and the liquid outlet pipe respectively, a ball core 3 being arranged in the valve body 1, a valve stem 4 being inserted at the top of the ball core 3, the valve stem 4 passing through the top end of the valve body 1, the ball core 3 being able to rotate through the valve stem 4, valve seats 5 matching the ball core 3 being arranged on the left and right sides of the valve body 1 respectively, butterfly springs 11 being arranged on the side of the two valve seats 5 away from the ball core 3, the butterfly springs 11 being able to exert a continuous pre-tightening force on the valve seat 5, so that the valve seat 5 fits tightly to the surface of the ball body, and an effective seal can be formed even in the absence of medium pressure, sealing rings 12 coaxially arranged with the valve seat 5 are arranged on the left and right sides of the valve body 1 respectively, and a sealing mechanism 6 is also included.

[0027] See also Figure 2 , Figure 3 , Figure 6 and Figure 7 As shown, the sealing mechanism 6 is arranged in the valve seat 5, including an annular cavity 61 opened in the valve seat 5, a first elastic member 62 in contact with the butterfly spring 11 is arranged on one side of the valve seat 5, the first elastic member 62 is corrosion-resistant rubber, the first elastic member 62 and the valve seat 5 form an extrusion cavity 63, the extrusion cavity 63 is communicated with the annular cavity 61, a plurality of circumferentially uniformly distributed first annular grooves are opened on the circumferential side of the valve seat 5, a movable plate 64 is arranged in the first annular groove, a first flow channel 65 communicating with the plurality of annular cavities 61 is opened in the valve seat 5, one end of the first flow channel 65 away from the annular cavity 61 is communicated with the first annular groove, and a piston rod 66 is sealingly and slidably connected in the first flow channel 65, a fluid medium is arranged in the annular cavity 61 and the first elastic member 62, and in this embodiment, the fluid medium in the annular cavity 61 and the first elastic member 62 is hydraulic oil.

[0028] See also Figure 7 As shown, to supplement the connection between the annular cavity 61 and the extrusion cavity 63 , a second flow channel 67 is provided inside the valve seat 5 , and two ends of the second flow channel 67 are respectively connected to the annular cavity 61 and the extrusion cavity 63 .

[0029] In order to make the deformation of the sealing ring 12 more uniform and to produce a sealing effect in two directions, the first annular groove is located in the middle of the sealing ring 12 .

[0030] See also Figures 1 to 3 As shown, a handle 8 is fixedly connected to the top of the valve stem 4, a connecting piece 9 is provided on the valve stem 4, a fixing piece 91 is provided on one of the joints 2, and lock holes are provided on the connecting piece 9 and the fixing piece 91. Through the connection piece 9, the fixing piece 91 and the lock hole, when the valve is closed or opened, the worker sets a lock in the lock hole, which can effectively prevent the worker from operating it incorrectly.

[0031] See also Figure 2 and Figure 3 As shown, a sealing packing is arranged between the valve body 1 and the valve stem 4, and a plastic sleeve is sleeved on the handle 8, and the plastic sleeve can protect the hand.

[0032] During use, a worker can operate the valve through the handle 8. When the handle 8 is rotated to close the valve, the fluid medium gathers on one side of the ball core 3 and generates pressure. The butterfly spring 11 is squeezed and moves closer to the ball core 3. The first elastic member 62 is squeezed and the hydraulic oil in the extrusion chamber 63 enters the annular chamber 61 through the second flow channel 67. The hydraulic oil in the annular chamber 61 enters the multiple first flow channels 65 and moves the piston column 66 inside. The multiple piston columns 66 push the movable plate 64 to move outward respectively, and the sealing ring 12 is squeezed by the movable plate 64 and deformed.

[0033] Through the annular cavity 61, the first elastic member 62, the first flow channel 65, the piston column 66 and the movable plate 64, when the valve is in a closed state, the pressure at the liquid inlet end increases and causes the butterfly spring 11 to move closer to the ball core 3, the first elastic member 62 is deformed and causes the hydraulic oil in the extrusion cavity 63 and the annular cavity 61 to enter the multiple first flow channels 65, and the multiple piston columns 66 move outward and squeeze the sealing ring 12. Since the first annular groove is located in the middle of the sealing ring 12, when the movable plate 64 squeezes the sealing ring 12, the sealing ring 12 is deformed and can simultaneously enhance the sealing effect on both sides thereof. The greater the pressure in the valve, the better the sealing performance of the valve body 1 and the joint 2, which effectively prevents leakage of the valve body 1 and the joint 2 due to aging or damage of the sealing ring 12.

[0034] Embodiment 2 During the use of the three-piece ball valve, a sealing surface is formed between the ball and the valve seat 5. If the medium contains sand, colloid or other fine particles, these substances may be deposited between the ball and the valve seat 5 during the valve closing period, forming an obstacle. When trying to open the valve, these deposits will provide additional resistance when the ball just starts to rotate. In order to improve the above problem, further improvements are made on the basis of the above embodiment.

[0035] See also Figure 8 and Fig. 9 As shown, the contact surface between the valve seat 5 and the ball core 3 is a sealing surface, and the sealing mechanism 6 also includes a plurality of movable grooves 68 opened on the sealing surface. The plurality of movable grooves 68 are evenly distributed in a circle along the axis of the valve seat 5, and an arc plate 681 is sealingly and slidingly connected in the movable groove 68, and a third flow channel 69 is opened between the annular cavity 61 and the plurality of movable grooves 68.

[0036] During use, after the first elastic member 62 is squeezed, the hydraulic oil in the extrusion chamber 63 enters the annular chamber 61. At this time, the hydraulic oil in the annular chamber 61 not only enters the first flow channel 65, but also enters the movable groove 68 through the third flow channel 69. At this time, the contact force between the arc plate 681 and the ball core 3 increases, and the movement degree of the arc plate 681 is proportional to the deformation degree of the first elastic member 62.

[0037] At the same time, when the ball rotates a certain angle, the valve gradually opens and reduces the pressure at its liquid inlet end, the butterfly spring 11 gradually resets and resets the first elastic member 62. At this time, the friction between the arc plate 681 and the surface of the ball core 3 is reduced, so that the blocking feeling between the ball core 3 and the valve seat 5 is further reduced, avoiding a series of problems caused by the ball core 3 not rotating into place.

[0038] Through the settings of the annular cavity 61, the third flow channel 69, the movable groove 68 and the arc plate 681, the arc plate 681 moves as the pressure in the valve body 1 increases, thereby increasing the contact force between the arc plate 681 and the ball core 3. When the contact force between the arc plate 681 and the ball core 3 is greater, the sealing between the valve seat 5 and the ball core 3 is better, and the impurities in the sealing surface are less, which not only improves the sealing between the valve seat 5 and the ball core 3, but also avoids a greater sense of blockage between the valve seat 5 and the ball core 3 when the worker turns the valve stem 4 due to more residual impurities.

[0039] Embodiment 3 When the ball valve is in a closed state, the contact surface between the ball and the valve seat 5 may generate a large static friction force, which needs to be overcome when the ball starts to rotate, thus causing an initial blocking feeling or a high starting torque. Further improvements are made based on the above embodiment.

[0040] See also Figures 9 to 12 As shown, an auxiliary mechanism 7 is provided inside the ball core 3 and the valve stem 4. When the auxiliary mechanism 7 is activated, the arc plate 681 slides into the movable groove 68, so that the arc plate 681 is out of contact with the ball core 3.

[0041] See also Fig. 9 and Fig.11 As shown, the auxiliary mechanism 7 includes a second annular groove 71 opened on the surface of the ball core 3, the number of the second annular grooves 71 is four and they are respectively matched with the sealing surfaces of the valve seat 5, a second elastic member 72 is fixedly connected in the second annular groove 71, a compression mechanism 73 coaxially arranged with the valve stem 4 is arranged on the ball core 3, a fourth flow channel 74 is opened in two second annular grooves 71 at the same height as the compression mechanism 73, and the fourth flow channel 74 is connected to the compression mechanism 73, and a fifth flow channel 75 is arranged between the two second annular grooves 71 symmetrically arranged in upper and lower directions.

[0042] A compression piece 76 is coaxially arranged inside the valve stem 4, and fluid medium is arranged inside the compression mechanism 73, the second annular groove 71, the fourth flow channel 74 and the fifth flow channel 75. When the compression piece 76 moves downward, the fluid medium in the compression mechanism 73 flows into the four second annular grooves 71, and the second elastic piece 72 is deformed to cause the arc plate 681 to break away from contact with the ball core 3.

[0043] See also Fig.11 As shown, the compression mechanism 73 includes a central cavity 731 opened in the ball core 3, the central cavity 731 is coaxially arranged with the valve stem 4, a piston plate 732 is sealingly and slidably connected in the central cavity 731, a fixing column 733 is coaxially fixed on the piston plate 732, a slot 31 is provided on the top of the ball core 3, the valve stem 4 is inserted into the slot 31, one end of the fixing column 733 away from the piston plate 732 passes through the slot 31, and an elastic reset member 734 is provided between the piston plate 732 and the central cavity 731.

[0044] See also Figure 5 and Fig.12 As shown, the compression member 76 includes a connecting rod 761 coaxially arranged with the valve stem 4, a through hole is coaxially opened in the valve stem 4, the connecting rod 761 is threadedly connected to the through hole, a through groove 762 is opened at one end of the valve stem 4 close to the slot 31, the end of the connecting rod 761 close to the ball core 3 is located in the through groove 762, and a handle is provided on the end of the connecting rod 761 extending out of the valve stem 4.

[0045] During use, when a worker feels a greater sense of blockage when operating the handle 8, he or she may rotate the connecting rod 761 by means of the handle. Since the connecting rod 761 is threadedly connected to the valve stem 4, as the connecting rod 761 rotates, the fixed column 733 is squeezed by the connecting rod 761 and shrinks into the central cavity 731. The hydraulic oil in the central cavity 731 enters two second annular grooves 71 at the same height through the fourth flow channel 74. The two second annular grooves 71 symmetrically arranged up and down are connected through the fifth flow channel 75. As the pressure in the four second annular grooves 71 gradually increases, the second elastic member 72 bulges outward and causes the arc plate 681 to break away from the surface of the ball core 3. At this time, the contact area between the valve seat 5 and the ball core 3 is reduced, so that the sense of blockage when the ball core 3 rotates is weakened.

[0046] Through the arrangement of the central cavity 731, the connecting rod 761, the second annular groove 71 and the second elastic member 72, when the worker turns the handle 8, he feels a greater sense of blockage, and the hydraulic oil in the central cavity 731 is transported to the four second annular grooves 71 by rotating the connecting rod 761. As the pressure in the second annular groove 71 increases, the second elastic member 72 is deformed and the corresponding arc plate 681 is out of contact with the ball core 3, thereby reducing the contact area between the valve seat 5 and the ball core 3, thereby reducing the static friction between the two, and improving the sense of blockage during the initial rotation of the valve stem 4.

[0047] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A three-piece high-pressure ball valve with lock, comprising a valve body (1) and joints (2) symmetrically arranged on the left and right sides thereof, characterized in that: The valve body (1) is provided with a ball core (3), the top of the ball core (3) is plugged with a valve stem (4), the valve stem (4) passes through the top of the valve body (1), the left and right sides of the valve body (1) are respectively provided with valve seats (5) matching the ball core (3), the sides of the two valve seats (5) away from the ball core (3) are both provided with butterfly springs (11), the left and right sides of the valve body (1) are respectively provided with sealing rings (12) coaxially arranged with the valve seats (5), and further comprising: A sealing mechanism (6), wherein the sealing mechanism (6) is arranged in the valve seat (5), and comprises an annular cavity (61) opened in the valve seat (5); a first elastic member (62) in contact with the butterfly spring (11) is arranged on one side of the valve seat (5); the first elastic member (62) and the valve seat (5) form an extrusion cavity (63); the extrusion cavity (63) is communicated with the annular cavity (61); a plurality of first annular grooves evenly distributed around the circumference are opened on the circumferential side of the valve seat (5); a movable plate (64) is arranged in the first annular groove; a first flow channel (65) in communication with the plurality of annular cavities (61) is opened in the valve seat (5); an end of the first flow channel (65) away from the annular cavity (61) is communicated with the first annular groove; a piston rod (66) is sealingly and slidably connected in the first flow channel (65); a fluid medium is arranged in both the annular cavity (61) and the first elastic member (62).

2. The three-piece high-pressure locking ball valve according to claim 1, characterized in that: A second flow channel (67) is provided inside the valve seat (5), and two ends of the second flow channel (67) are respectively connected to the annular cavity (61) and the extrusion cavity (63).

3. The three-piece high-pressure locking ball valve according to claim 2 is characterized in that: The first annular groove is located in the middle of the sealing ring (12).

4. The three-piece high-pressure locking ball valve according to claim 3 is characterized in that: The contact surface between the valve seat (5) and the ball core (3) is a sealing surface. The sealing mechanism (6) further comprises a plurality of movable grooves (68) formed on the sealing surface. The plurality of movable grooves (68) are evenly distributed in a circle along the axis of the valve seat (5). An arc plate (681) is sealingly and slidably connected inside the movable groove (68). A third flow channel (69) is formed between the annular cavity (61) and the plurality of movable grooves (68).

5. The three-piece high-pressure locking ball valve according to claim 4 is characterized in that: It also includes an auxiliary mechanism (7), which is arranged in the ball core (3) and the valve stem (4). When the auxiliary mechanism (7) is activated, the arc plate (681) slides into the movable groove (68), so that the arc plate (681) is out of contact with the ball core (3).

6. The three-piece high-pressure locking ball valve according to claim 5, characterized in that: The auxiliary mechanism (7) comprises a second annular groove (71) formed on the surface of the ball core (3); the number of the second annular grooves (71) is four and they respectively match the sealing surface of the valve seat (5); a second elastic member (72) is fixedly connected in the second annular groove (71); a compression mechanism (73) coaxially arranged with the valve stem (4) is provided on the ball core (3); a fourth flow channel (74) is formed in two of the second annular grooves (71) at the same height as the compression mechanism (73); the fourth flow channel (74) is communicated with the compression mechanism (73); and a fifth flow channel (75) is provided between the two second annular grooves (71) symmetrically arranged in an upper and lower direction; A compression member (76) is coaxially arranged inside the valve stem (4), and fluid medium is arranged inside the compression mechanism (73), the second annular groove (71), the fourth flow channel (74) and the fifth flow channel (75). When the compression member (76) moves downward, the fluid medium in the compression mechanism (73) flows into the four second annular grooves (71), and the second elastic member (72) is deformed to cause the arc plate (681) to break away from contact with the ball core (3).

7. The three-piece high-pressure locking ball valve according to claim 6, characterized in that: The compression mechanism (73) comprises a central cavity (731) opened in the ball core (3), the central cavity (731) and the valve stem (4) are coaxially arranged, a piston plate (732) is sealingly and slidably connected in the central cavity (731), a fixing column (733) is coaxially fixed on the piston plate (732), a slot (31) is arranged at the top of the ball core (3), the valve stem (4) is inserted into the slot (31), one end of the fixing column (733) away from the piston plate (732) passes through the slot (31), and an elastic reset member (734) is arranged between the piston plate (732) and the central cavity (731).

8. The three-piece high-pressure locking ball valve according to claim 7, characterized in that: The compression member (76) comprises a connecting rod (761) coaxially arranged with the valve stem (4); a through hole is coaxially opened in the valve stem (4); the connecting rod (761) is threadedly connected to the through hole; a through groove (762) is opened at one end of the valve stem (4) close to the slot (31); an end of the connecting rod (761) close to the ball core (3) is located in the through groove (762); and a handle is provided at one end of the connecting rod (761) extending out of the valve stem (4).

9. The three-piece high-pressure locking ball valve according to claim 8, characterized in that: A handle (8) is fixedly connected to the top end of the valve stem (4), a connecting piece (9) is provided on the valve stem (4), a fixing piece (91) is provided on one of the joints (2), and locking holes are provided on the connecting piece (9) and the fixing piece (91).

10. The three-piece high-pressure locking ball valve according to claim 9, characterized in that: A sealing filler is provided between the valve body (1) and the valve stem (4), and a plastic sleeve is provided on the handle (8).

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