CN111981194A - An anti-leakage self-sealing valve - Google Patents

Abstract

The invention discloses an anti-leakage self-sealing valve, comprising a valve body, a valve cover, a gland, a valve stem, a limit block, a lower sealing ring, a valve plate, a handwheel, a self-sealing mechanism and a bracket, and the bracket is press-fitted Between the valve cover and the valve body, the valve stem includes an upper valve stem and a threaded rod. The upper valve stem can move up and down relative to the valve cover. The threaded rod is rotatably arranged on the bracket, and the threaded rod is threadedly connected to the valve plate. The rod body is provided with an annular limit groove, the bottom of the annular limit groove is provided with an L-shaped limit groove, the lower end of the main rod body is connected with a drive block, the top of the threaded rod is provided with a drive groove, and the lower sealing ring is installed at the lower part of the valve cover. In the sealing groove, the self-sealing mechanism includes a booster table and several elastic push rods, the booster table is fixed on the main rod body, and the elastic push rod is arranged between the booster table and the lower sealing ring. In the daily use of the present invention, the lower sealing ring is in a natural state, which prevents the lower sealing ring from being in a compressed state for a long time and prolongs the service life of the lower sealing ring.

Description

An anti-leakage self-sealing valve

technical field

The invention relates to the technical field of valves, in particular to an anti-leakage self-sealing valve.

Background technique

The valve is the control component in the fluid conveying system, which has the functions of diversion, cut-off, throttling, check and other functions. Common shut-off valves include gate valve, ball valve, globe valve, butterfly valve, etc.

Published patent CN203628011U discloses a fluid control valve, providing an anti-leakage self-sealing valve with good sealing effect, which can replace the sealing ring under the condition of continuous water and pressure, including valve body, valve cover, gland, valve plate , valve stem, opening device, inverted conical sealing ring and pressing ring, the valve cover is set above the valve body, the gland can be disassembled and installed above the valve cover, the valve body has a water inlet and a water outlet through the medium fluid, The valve plate can be lifted up and down between the water inlet and the water outlet. One end of the valve stem passes through the gland and the valve cover and is threadedly connected to the valve plate. The opening device is arranged on the free end of the valve stem. There are at least two upper sealing rings between the rods, and a limit ring to limit the axial movement of the valve rod is set between the upper end of the valve rod and the valve cover. Between the valve stems, there is a gap without friction between the inverted conical sealing ring and the valve stem. The pressing ring is sleeved on the upper part of the valve plate outside the lower part of the valve stem, and can rise and fall with the up and down of the valve plate. After the valve is fully opened, the compression ring is pressed against the inverted cone sealing ring, so that the upper sealing ring can be replaced by continuous water pressure. However, in the actual use process, it is found that when the valve is always open, the inverted cone sealing ring is often compressed for a long time, which makes the inverted cone sealing ring easily damaged.

SUMMARY OF THE INVENTION

In view of this, the present invention provides an anti-leakage self-sealing valve to solve the above technical problems.

In order to achieve the above purpose, the present invention provides the following technical solutions: an anti-leakage self-sealing valve, comprising a valve body, a valve cover, a gland, a valve stem, a limit block, a lower sealing ring, a valve plate and a handwheel, and also includes: A self-sealing mechanism and a bracket, the bracket is press-fitted between the valve cover and the valve body, the valve stem includes an upper valve stem and a threaded rod arranged below the upper valve stem, the upper valve The rod can move up and down relative to the valve cover, the threaded rod is rotatably arranged on the bracket, and the threaded rod is threadedly connected with the valve plate, and the main rod body of the upper valve rod is provided with a connection with the limiter. An annular limit groove matched with the position block, the bottom of the annular limit groove is provided with an L-shaped limit groove matched with the limit block, the lower end of the main rod body is connected with a drive block, and the thread The top end of the rod is provided with a drive slot that matches the drive block. When the limit block is snapped into the horizontal extension of the L-shaped limit slot, the drive block is separated from the drive slot, so The lower sealing ring is installed in the sealing groove at the lower part of the valve cover, the inner circumference of the lower sealing ring is pressed against the main rod body, and the self-sealing mechanism includes a booster table and several elastic push rods, so The booster table is fixed on the main rod body, a plurality of elastic push rods are arranged at intervals around the main rod body, the lower end of the elastic push rod is pressed against the booster table, and the upper end of the elastic push rod pressed against the lower sealing ring.

Further, a first lip and a second lip are arranged on the inner circumference of the lower sealing ring at intervals, and both the first lip and the second lip are pressed against the outer circumference of the main rod body, A third lip portion is provided on the outer peripheral portion of the upper part of the lower sealing ring, and the third lip portion is press-fitted into the extending groove at the top of the sealing groove.

Further, the top of the elastic push rod is provided with a pressing plate portion, and the pressing plate portion is pressed against the lower sealing ring.

Further, the bottom of the elastic push rod is provided with a universal ball, and the universal ball can roll on the booster table.

Further, the elastic push rod includes an upper rod cover, a lower push rod whose upper end is movably arranged in the inner hole of the upper rod cover, and a first push rod disposed between the upper rod cover and the lower push rod. A compression spring, the pressing plate part is connected and arranged on the top end of the upper rod sleeve, and the universal ball is installed on the bottom end of the lower push rod.

Further, it also includes a plurality of auxiliary sealing mechanisms, which are distributed around the valve stem at intervals, and the auxiliary sealing mechanism includes a lateral pressure block, a first connecting rod, a second connecting rod, a top rod, and a sliding cylinder. , a second compression spring and a rolling seat, the lateral pressure block is slidably arranged on the bottom of the valve cover, and the lateral pressure block is pressed against the outer circumference of the lower sealing ring, and one end of the first link pivots connected to the lateral pressure block, the other end of the first link is pivotally connected to one end of the second link, the other end of the second link is pivotally connected to the valve cover, the The upper end of the ejector rod is pivotally connected to the pivot shafts of the first link and the second link, the lower end of the ejector rod is slidably arranged in the sliding cylinder, and the second compression spring is arranged at the Between the top rod and the sliding cylinder, the lower end of the sliding cylinder is slidably arranged on the roller seat, and the roller seat is rotatably arranged on the booster table.

Further, a first protruding part and a second protruding part are provided at intervals on the lateral pressing block, the first protruding part is pressed against the first concave part on the outer circumference of the lower sealing ring, and the The second protruding portion is pressed against the second concave portion on the outer periphery of the lower sealing ring.

Further, a first step portion is connected on the outer periphery of the booster table, a second step portion is connected on the outer periphery of the first step portion, and the bottom of the roller seat is connected to the first step portion. A number of first balls are arranged between them, the bottoms of the first balls are rollingly arranged in the first annular raceway at the top of the first step portion, and the tops of the first balls are rollingly arranged at the bottom of the rolling seat. In the third annular raceway on the first platform surface, a number of third balls are arranged between the bottom of the rolling seat and the second step, and the bottom of the third ball is rolled on the second step In the second annular raceway at the top of the roller seat, the top of the third ball is rolled and arranged in the fifth annular raceway on the second platform surface of the bottom of the rolling seat.

Further, a plurality of second balls are arranged between the roller seat and the first step portion, and one side of the second balls is rolled in the fourth annular raceway at the bottom corner of the roller seat. , the other side of the second ball is rollingly arranged in the sixth annular raceway on the outer edge of the first step portion.

Further, the top of the rolling seat is provided with a T-shaped chute, and the lower part of the sliding cylinder is provided with a T-shaped platform matched with the T-shaped chute.

It can be seen from the above technical solutions that the advantages of the present invention are: in daily use, the driving block at the bottom of the upper valve rod is inserted into the driving groove on the top of the threaded rod, so that the upper valve rod can pass through the matching driving block and The driving groove drives the threaded rod to rotate synchronously, and the first compression spring and the second compression spring are both in a natural state, so that the lower sealing ring is also in a natural state, which prevents the lower sealing ring from being in a compressed state for a long time, and prolongs the use of the lower sealing ring. When the upper sealing ring needs to be replaced, the user firstly pulls the upper valve stem upwards to separate the drive block from the drive groove, until the upper valve stem cannot continue to move upward, and then turns the upper valve stem to make the limit block snap into the annular limit In the horizontal extension of the position groove, the first compression spring and the second compression spring can be compressed, so that the lower sealing ring is squeezed and deformed and tightly pressed against the upper valve stem to form a seal, which can realize the continuous water belt. Press to replace the upper sealing ring.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

FIG. 1 is a schematic structural diagram of the present invention.

FIG. 2 is an enlarged view of S in FIG. 1 .

FIG. 3 is an enlarged view at T in FIG. 1 .

FIG. 4 is an enlarged view of U in FIG. 1 .

FIG. 5 is an enlarged view of W in FIG. 1 .

FIG. 6 is a schematic three-dimensional structure diagram of the upper valve stem of the present invention.

List of reference numerals: valve cover 1, groove 11, sealing groove 12, extension groove 13, side groove 14, guide hole 15, escape groove 16, gland 2, valve stem 3, upper valve stem 31, main rod body 311, Annular limiting groove 3111, L-shaped limiting groove 3112, driving block 312, threaded rod 32, driving groove 321, limiting block 4, lower sealing ring 5, first lip 51, second lip 52, third lip part 53 , first recessed part 54 , second recessed part 55 , self-sealing mechanism 6 , booster table 61 , first stepped part 611 , first annular raceway 6111 , sixth annular raceway 6112 , second stepped part 612 , the second annular raceway 6121, the elastic push rod 62, the upper rod sleeve 621, the pressure plate part 6211, the inner hole 6212, the lower push rod 622, the first compression spring 623, the universal ball 624, the auxiliary sealing mechanism 7, the lateral pressure block 71. The first protruding part 711, the second protruding part 712, the guide rod part 713, the first connecting rod 72, the second connecting rod 73, the top rod 74, the horizontal plate part 741, the sliding cylinder 75, the T-shaped table part 751, second compression spring 76, roller seat 77, T-shaped chute 771, first platform surface 772, second platform surface 773, third annular raceway 774, fourth annular raceway 775, fifth annular raceway 776 , the first ball 781 , the second ball 782 , the third ball 783 , the cage 79 , the bracket 8 , and the valve body 9 .

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but not to limit the present invention.

Referring to Figures 1 to 6, an anti-leakage self-sealing valve shown in Figures 1, 5 and 6 includes a valve body 9, a valve cover 1, a gland 2, a valve stem 3, a limit block 4, The lower sealing ring 5, the valve plate, the hand wheel, the bracket 8 and the self-sealing mechanism 6, the valve cover 1 is arranged above the valve body 9, the gland 2 is fixed above the valve cover 1 by bolts, and the gap between the gland 2 and the valve cover 1 is A sealing ring is provided, the bracket 8 is press-fitted between the valve cover 1 and the valve body 9, the limit block 4 is limited by the gland 2 in the groove 11 on the valve cover 1, and the valve stem 3 includes the upper valve stem 31 and The threaded rod 32 is arranged under the upper valve stem 31. The upper end of the upper valve stem 31 passes through the valve cover 1, the gland 2 and the handwheel in turn, and the upper valve rod 31 can move up and down relative to the valve cover 1. The upper valve rod 31 There are three upper sealing rings spaced from top to bottom between the main rod body 311 and the gland 2. The main rod body 311 is provided with an annular limit groove 3111 which is matched with the limit block 4, and the bottom of the annular limit groove 3111 is provided with There is an L-shaped limit slot 3112 for the limit block 4 to be inserted into. The lower end of the main rod body 311 is connected with a drive block 312. The threaded rod 32 is rotatably arranged on the bracket 8, and the threaded rod 32 is threaded with the valve plate. The top end of the rod 32 is provided with a drive slot 321 which is adapted to the drive block 312. When the limit block 4 is located in the annular limit slot 3111, the drive block 312 is inserted into the drive slot 321. When inside the horizontal extension of the L-shaped limiting groove 3112 , the driving block 312 is separated from the driving groove 321 , the lower sealing ring 5 is installed in the sealing groove 12 at the lower part of the valve cover 1 , and the inner circumference of the lower sealing ring 5 abuts against the main rod body 311 Above, the self-sealing mechanism 6 includes a booster table 61 and several elastic push rods 62, the booster table 61 is fixed on the main rod body 311, and several elastic push rods 62 are arranged around the main rod body 311. The lower end of the elastic push rod 62 Press on the booster table 61 , the upper end of the elastic push rod 62 presses against the lower sealing ring 5 , when the operator pulls the upper valve rod 31 upwards, the upper valve rod 31 drives the booster table 61 to push against the elastic push rod 62 , so that the pressing plate portion 6211 of the upper end of the elastic push rod 62 tightly presses against the lower sealing ring 5 , so that the lower sealing ring 5 is deformed and tightly pressed against the main rod body 311 to form a seal.

As shown in FIG. 2 , the inner circumference of the lower sealing ring 5 is provided with a first lip 51 and a second lip 52 at intervals from top to bottom, and both the first lip 51 and the second lip 52 are pressed against the main rod body On the outer circumference of 311, the outer circumference of the upper part of the lower sealing ring 5 is provided with a third lip part 53, and the third lip part 53 is press-fitted into the extension groove 13 at the top of the sealing groove 12. The above structure can form multiple seals, and further can Effectively improve the sealing effect of the lower sealing ring 5.

In this embodiment, the elastic push rod 62 includes an upper rod sleeve 621 , a lower push rod 622 whose upper end is movably disposed in the inner hole 6212 of the upper rod sleeve 621 , and a first push rod 622 disposed between the upper rod sleeve 621 and the lower push rod 622 To compress the spring 623 , the pressing plate portion 6211 is disposed on the top of the upper rod sleeve 621 , and the pressing plate portion 6211 extends into the sealing groove 12 .

In this embodiment, a plurality of pressing plate portions 6211 can form a closed annular plate, so that the pressing plate portion 6211 has a good effect of pressing the lower sealing ring 5 .

In this embodiment, the bottom of the lower push rod 622 is provided with a universal ball 624, and the universal ball 624 can roll on the booster table 61, which reduces the connection between the bottom end of the elastic push rod 62 and the booster table when the valve rod 3 rotates. Friction between 61.

As shown in FIG. 1, in order to further improve the sealing effect of the lower sealing ring 5, the valve also includes a number of auxiliary sealing mechanisms 7, which are distributed at intervals around the valve stem 3, and the auxiliary sealing mechanisms 7 are used for lateral resistance Press down the sealing ring 5 to improve the sealing performance at the lower sealing ring 5 .

As shown in FIG. 3 , the auxiliary sealing mechanism 7 includes a lateral pressure block 71 , a first link 72 , a second link 73 , a top rod 74 , a sliding cylinder 75 , a second compression spring 76 and a roller seat 77 , and the lateral pressure block 71 It is slidably arranged in the side groove 14 outside the sealing groove 12 , the inner side of the lateral pressing block 71 is pressed against the outer periphery of the lower sealing ring 5 , and the guide rod portion 713 on the outer side of the lateral pressing block 71 passes through the guide hole 15 on the outer side of the side groove 14 . It extends into the avoidance groove 16 at the other end of the guide hole 15 , one end of the first link 72 extends into the avoidance groove 16 and is pivotally connected to the guide rod 713 , and the other end of the first link 72 is connected to the second link 73 . One end is pivotally connected, the other end of the second link 73 is pivotally connected to the valve cover 1, the upper end of the top rod 74 is pivotally connected to the pivot shaft of the first link 72 and the second link 73, and the lower end of the top rod 74 The second compression spring 76 is sleeved on the top rod 74, and the upper end of the second compression spring 76 is pressed against the horizontal plate portion 741 on the upper part of the top rod 74. The lower end of the second compression spring 76 Press against the upper end surface of the sliding cylinder 75, the lower end of the sliding cylinder 75 is slidably arranged on the roller seat 77, and the roller seat 77 is rotatably arranged on the booster table 61. When the table 61 moves up, the booster table 61 drives the sliding cylinder 75 to move up through the roller seat 77, and the sliding cylinder 75 pushes the ejector rod 74 to move up through the second compression spring 76, and then the ejector rod 74 drives the second connecting rod 73 to swing, and the first The second connecting rod 73 pushes the transverse pressure block 71 through the first connecting rod 72, so that the transverse pressure block 71 presses tightly against the outer circumference of the lower sealing ring 5, thereby making the inner circumference of the lower sealing ring 5 press against the valve stem more tightly 3, the sealing performance of the lower sealing ring 5 is improved.

In this embodiment, a first protruding portion 711 and a second protruding portion 712 are provided at intervals on the upper right and lower sides of the inner side of the lateral pressing block 71 . The first protruding portion 711 presses against the first recessed portion 54 on the outer periphery of the lower sealing ring 5 Inside, the second protruding portion 712 presses against the second concave portion 55 on the outer periphery of the lower sealing ring 5 .

As shown in FIG. 4 , a first step portion 611 is connected on the outer periphery of the booster table 61 , a second step portion 612 is connected on the outer periphery of the first step portion 611 , and the bottom of the roller seat 77 is connected with the first step portion 611 A plurality of first balls 781 , a plurality of second balls 782 and a plurality of third balls 783 are arranged between the second step portion 612 and the second step portion 612 , and the bottom of the first ball 781 is rolled on the first step portion. In the first annular raceway 6111 at the top of the 611, the top of the first ball 781 is rolled and arranged in the third annular raceway 774 on the first platform surface 772 at the bottom of the roller seat 77, and one side of the second ball 782 is rolled in the third annular raceway 774. In the fourth annular raceway 775 at the bottom corner of the roller seat 77, the other side of the second ball 782 is rolled in the sixth annular raceway 6112 on the outer edge of the first step portion 611, and the bottom of the third ball 783 rolls It is arranged in the second annular raceway 6121 at the top of the second step portion 612, and the top of the third ball 783 is rolled in the fifth annular raceway 776 on the second platform surface 773 at the bottom of the roller seat 77. The arrangement of the above structure The roller seat 77 can rotate flexibly and stably relative to the booster table 61 .

In this embodiment, the top of the roller seat 77 is provided with a T-shaped chute 771 , and the lower part of the sliding cylinder 75 is provided with a T-shaped platform portion 751 which is matched with the T-shaped chute 771 .

As shown in FIG. 1 , in daily use, the driving block 312 at the bottom of the upper valve rod 31 is inserted into the driving groove 321 at the top of the threaded rod 32, so that when the handwheel is turned, the upper valve rod 31 can be driven by the matching The block 312 and the driving groove 321 drive the threaded rod 32 to rotate synchronously, while the first compression spring 623 and the second compression spring 76 are both in a natural state, so that the lower sealing ring 5 is also in a natural state, preventing the lower sealing ring 5 from being compressed for a long time In this state, the service life of the lower sealing ring 5 is prolonged; when the upper sealing ring needs to be replaced, the user first pulls up the upper valve stem 31 with force to separate the driving block 312 from the driving groove 321 until the limit block 4 moves to the annular limit The bottom of the vertical extension of the groove 3111 prevents the upper valve stem 31 from moving upward, and then rotates the upper valve stem 31 to make the limit block 4 snap into the horizontal extension of the annular limit groove 3111. At this time, the first compression spring 623 and The second compression springs 76 are all in a compressed state, so that the lower sealing ring 5 is deformed and tightly pressed against the upper valve stem 31 to form a seal, so that the upper sealing ring can be replaced with continuous water pressure.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, various modifications and changes may be made to the embodiments of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. The utility model provides a prevent outer hourglass self sealss valve, includes valve body (9), valve gap (1), gland (2), valve rod (3), stopper (4), lower seal circle (5), valve plate and hand wheel, its characterized in that still includes self sealss mechanism (6) and support (8), support (8) are pressed fitting in valve gap (1) with between valve body (9), valve rod (3) are in including last valve rod (31) and setting threaded rod (32) of going up valve rod (31) below, it can be relative to go up valve rod (31) valve gap (1) is movable from top to bottom, threaded rod (32) rotate to set up on support (8), just threaded rod (32) with valve plate threaded connection, go up be provided with on mobile jib body (311) of valve rod (31) with stopper (4) matched with annular spacing groove (3111), the bottom of annular spacing groove (3111) be provided with stopper (4) matched with L shape spacing Groove (3112), the lower extreme of the body of the mast (311) is connected and is provided with drive block (312), the top of threaded rod (32) be provided with drive groove (321) of drive block (312) looks adaptation, work as stopper (4) card go into when the horizontal extension of L shape spacing groove (3112) is interior, drive block (312) with drive groove (321) separation, install down sealing washer (5) in seal groove (12) of valve gap (1) lower part, the interior week of lower sealing washer (5) supports and presses on the body of the mast (311), self-sealing mechanism (6) are including helping push platform (61) and a plurality of elastic push rod (62), help push platform (61) rigid coupling is in on the body of the mast (311), a plurality of elastic push rod (62) encircle the body of the mast (311) interval sets up, the lower extreme of elastic push rod (62) supports and presses on helping push platform (61), the upper end of the elastic push rod (62) is pressed against the lower sealing ring (5).

2. The leak-proof self-sealing valve according to claim 1, wherein the lower sealing ring (5) is provided with a first lip (51) and a second lip (52) at intervals on the inner circumference, the first lip (51) and the second lip (52) are both pressed against the outer circumference of the main rod body (311), a third lip (53) is provided on the outer circumference of the upper portion of the lower sealing ring (5), and the third lip (53) is press-fitted in the extension groove (13) at the top of the sealing groove (12).

3. The leak-proof self-sealing valve according to claim 2, wherein the top of the elastic push rod (62) is provided with a pressing plate portion (6211), and the pressing plate portion (6211) is pressed against the lower sealing ring (5).

4. The leak-proof self-sealing valve as claimed in claim 3, wherein the bottom of the elastic push rod (62) is provided with a universal ball (624), and the universal ball (624) can roll on the boosting platform (61).

5. The anti-leakage self-sealing valve according to claim 4, wherein the elastic push rod (62) comprises an upper rod sleeve (621), a lower push rod (622) with the upper end movably arranged in an inner hole (6212) of the upper rod sleeve (621), and a first compression spring (623) arranged between the upper rod sleeve (621) and the lower push rod (622), the pressing plate part (6211) is connected and arranged at the top end of the upper rod sleeve (621), and the universal ball (624) is arranged at the bottom end of the lower push rod (622).

6. The leak-proof self-sealing valve according to claim 2 or 5, further comprising a plurality of auxiliary sealing mechanisms (7), wherein the plurality of auxiliary sealing mechanisms (7) are distributed around the valve rod (3) at intervals, the auxiliary sealing mechanisms (7) comprise a transverse pressing block (71), a first connecting rod (72), a second connecting rod (73), a top rod (74), a sliding cylinder (75), a second compression spring (76) and a rolling seat (77), the transverse pressing block (71) is slidably arranged at the bottom of the valve cap (1), the transverse pressing block (71) is pressed against the periphery of the lower sealing ring (5), one end of the first connecting rod (72) is pivoted on the transverse pressing block (71), the other end of the first connecting rod (72) is pivoted with one end of the second connecting rod (73), the other end of the second connecting rod (73) is pivoted on the valve cap (1), the upper end of the ejector rod (74) is pivoted on a pivoting shaft of the first connecting rod (72) and the second connecting rod (73), the lower end of the ejector rod (74) is arranged in the sliding cylinder (75) in a sliding mode, the second compression spring (76) is arranged between the ejector rod (74) and the sliding cylinder (75), the lower end of the sliding cylinder (75) is arranged on the rolling seat (77) in a sliding mode, and the rolling seat (77) is arranged on the boosting platform (61) in a rotating mode.

7. The leak-proof self-sealing valve according to claim 6, wherein the transverse pressing block (71) is provided with a first protrusion (711) and a second protrusion (712) at intervals, the first protrusion (711) is pressed in the first recess (54) on the outer periphery of the lower sealing ring (5), and the second protrusion (712) is pressed in the second recess (55) on the outer periphery of the lower sealing ring (5).

8. The anti-leakage self-sealing valve according to claim 7, wherein a first step portion (611) is connected to the outer periphery of the booster stage (61), a second step portion (612) is connected to the outer periphery of the first step portion (611), a plurality of first balls (781) are arranged between the bottom of the roller seat (77) and the first step portion (611), the bottom of the first balls (781) is arranged in a first annular rolling way (6111) on the top of the first step portion (611) in a rolling way, the top of the first balls (781) is arranged in a third annular rolling way (774) on a first flat platform surface (772) on the bottom of the roller seat (77) in a rolling way, a plurality of third balls (783) are arranged between the bottom of the roller seat (77) and the second step portion (612), and the bottom of the third balls (783) is arranged in a second annular rolling way (6121) on the top of the second step portion (612) in a rolling way, the top of the third ball (783) is arranged in a fifth annular raceway (776) on a second flat table surface (773) at the bottom of the roller seat (77) in a rolling mode.

9. The leak-proof self-sealing valve according to claim 8, wherein a plurality of second balls (782) are further disposed between the roller seat (77) and the first step portion (611), one side of the second balls (782) is disposed in a fourth annular raceway (775) at a bottom corner of the roller seat (77) in a rolling manner, and the other side of the second balls (782) is disposed in a sixth annular raceway (6112) on an outer edge of the first step portion (611) in a rolling manner.

10. The leak-proof self-sealing valve as claimed in claim 6, wherein the top of the rolling seat (77) is provided with a T-shaped chute (771), and the lower part of the sliding cylinder (75) is provided with a T-shaped terrace portion (751) matched with the T-shaped chute (771).

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