Air-locked frictionless pneumatic poppet valve

Abstract

The application relates to the field of up-and-down valves, in particular to a gas-sealed frictionless pneumatic up-and-down valve, which comprises a valve body, a flange is arranged at the feed end position of the valve body, an annular groove is arranged between the flange and the feed end, a valve seat core is arranged in the annular groove, the valve seat core is arranged close to the inner side position of the annular groove, a gas channel is arranged at one side of the valve seat core, the gas channel is communicated with a channel arranged in the inner part of the feed end, and a gas source interface is arranged on the outer ring of the feed end and communicated with the channel; in the application, the capsule body and the valve core are cooperatively designed, the capsule body is filled with high-pressure gas to be expanded, the inner ring of the capsule body is pressed on the surface of the valve core, the valve core realizes the sealing of the feed end through the capsule body, and some residual materials in the inner ring of the feed end can be effectively pressed and sealed.

Description

Technical Field

[0001] This invention relates to the field of top-mounted valves, specifically a gas-sealed, frictionless pneumatic top-mounted valve. Background Technology

[0002] The top-discharge valve is a valve specifically designed for discharging materials from the bottom of reaction vessels, storage tanks, and other containers. The inlet of the top-discharge valve is connected to the bottom of the container. When material needs to be discharged, it is actuated by a cylinder on the valve body. Figure 2 As shown, the valve body is located at the top and the cylinder is located at the bottom. The output end of the cylinder pushes the valve rod upward, and the valve rod drives the valve core to move into the container. At this time, the feed end of the spread-out discharge valve is opened, and the material in the container flows along the feed end and is discharged from the discharge end of the valve body.

[0003] Currently, the sealing principle of most top-mounted discharge valves on the market is that the valve core moves and forms a seal with the valve seat. When encountering hard objects or easily crystallizing media, leakage is likely to occur. That is, the material gets stuck between the valve core and the valve seat, and a seal cannot be formed. Also, there is a distance between the valve core and the discharge port of the container, and the material in this space is difficult to be stirred. In other words, when the material is stirred and mixed in the container, the stirring cannot reach the material in this space, and the material is very easy to crystallize and solidify, thus blocking the valve and the discharge port. When the discharge valve is opened to discharge material, it is often necessary to manually remove the blockage crystals, which directly affects production efficiency.

[0004] Therefore, a gas-sealed, frictionless pneumatic top-mounted valve is proposed to address the above problems. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention provides a gas-sealed frictionless pneumatic top valve, including a valve body, a flange at the feed end of the valve body, an annular groove is formed on the inner ring between the flange and the feed end, a valve seat core is provided in the annular groove, the valve seat core is set close to the inner side of the annular groove, and an air passage is formed on one side of the valve seat core, the air passage is connected to the channel formed inside the feed end, and the channel is connected to the air source interface provided on the outer ring of the feed end; The valve seat core inner ring is provided with a ring-shaped bladder, which is set tightly against the valve seat core inner ring, and the outer ring of the bladder has an air inlet hole, which is connected to the air passage on the valve seat core. The inner ring of the bladder is tightly attached to the valve core outer ring of the valve body.

[0007] Preferably, the cross-section of the bladder is shaped like two opposing letters "C"; the inner ring of the valve seat core is adapted to the shape of the bladder.

[0008] Preferably, the inner top and bottom surfaces of the annular groove are provided with annular grooves; the upper and lower surfaces of the capsule are provided with annular protrusions, which are embedded in the grooves.

[0009] Preferably, the upper and lower surfaces of the inner ring of the valve seat core are provided with a second ring-shaped groove; the top and bottom of the outer ring of the bladder are provided with a second ring-shaped protrusion, which can be embedded in the second groove.

[0010] Preferably, the inner ring of the bladder body is provided with a ring-shaped protrusion No. 3; the outer ring of the valve core is provided with a recess No. 1 that matches the protrusion No. 3, and the recess No. 1 is ring-shaped.

[0011] Preferably, the inside of the bladder is provided with a sealing rod, which is arranged opposite to the air inlet. One end of the sealing rod is enlarged and fixed to the inner surface of the bladder, while the other end of the sealing rod is reduced in diameter and fits into the air inlet with a clearance. The outer ring of the valve core is also provided with a second recess, which is ring-shaped and has a diameter larger than that of the first recess.

[0012] Preferably, the airway port near the bladder is flared, and an insertion part is provided outside the air inlet, the shape of which is adapted to the shape of the flared part of the airway.

[0013] Preferably, each of the first protrusions has a liquid storage cavity inside, and each of the first protrusions has a discharge hole on its outer surface. The discharge holes are connected to the liquid storage cavities one by one, and the discharge holes are respectively arranged opposite to the first slot.

[0014] Preferably, each of the first slots is provided with an insert that is adapted to the discharge hole, the first protrusion is embedded in the first slot, and the insert can be inserted into the discharge hole on the first protrusion.

[0015] Preferably, the inner wall of the feed end is provided with a ring-shaped limiting ring, which is located away from the flange, and the inner end face of the valve core is provided with a sleeve, and a valve stem connected by a spring is provided inside the sleeve.

[0016] The advantages of this invention are: 1. In this invention, the bladder and valve core are designed to fit together. The bladder is filled with high-pressure gas and expands. The inner ring of the bladder is pressed against the surface of the valve core. The valve core achieves sealing of the feed end through the bladder and can effectively squeeze and seal some residual material in the inner ring of the feed end. 2. When the valve body is opened, the bladder contracts and deforms, and the crystallized and hardened material easily detaches from the valve core and the bladder, allowing subsequent material to smoothly enter the valve body from the container along the feed end.

[0017] 3. At the same time, there is no friction between the outer surface of the valve core and the inner ring of the feed end, and the rigid valve core is sealed by contact with the soft bladder, avoiding direct friction damage between the rigid valve core and the rigid valve body. Attached Figure Description

[0018] Figure 1 This is a perspective view of the air-sealed frictionless pneumatic top-mounted valve of the present invention; Figure 2 This is a cross-sectional view of the valve body in this invention; Figure 3 This is a schematic diagram illustrating the fit between the valve core and the limiting ring in this invention; Figure 4 This is a cross-sectional view of the fit between the flange and the valve body in this invention; Figure 5 This is a three-dimensional view of the capsule in this invention; Figure 6 This is a cross-sectional view of the capsule in this invention; Figure 7 This is a partially enlarged cross-sectional view of the capsule in this invention; Figure 8 This is a perspective view of the fit between the valve core and the valve stem in this invention; Figure 9 This is a cross-sectional view of the sleeve in this invention; Figure 10 This is a perspective view of the valve seat core in this invention; Figure 11 This is a cross-sectional view of the valve seat core in this invention; Figure 12 This is a partially enlarged cross-sectional view of the valve seat core in this invention.

[0019] In the diagram: 1. Valve body; 2. Flange; 3. Annular groove; 4. Valve seat core; 5. Air passage; 6. Feed end; 7. Channel; 8. Air source interface; 9. Bladder; 10. Air inlet; 11. Valve core; 12. Cylinder; 13. Frame; 14. Valve stem; 15. No. 1 slot; 16. No. 1 protrusion; 17. No. 2 slot; 18. No. 2 protrusion; 19. No. 3 protrusion; 20. No. 1 recess; 21. Sealing rod; 22. No. 2 recess; 23. Insertion part; 24. Liquid storage chamber; 25. Discharge hole; 26. Insert plate; 27. Limiting ring; 28. Sleeve; 29. ​​Spring. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0021] Reference Figure 1 - Figure 12A gas-sealed frictionless pneumatic top valve includes a valve body 1. A flange 2 is provided at the feed end 6 of the valve body 1. An annular groove 3 is formed on the inner ring between the flange 2 and the feed end 6. A valve seat core 4 is provided in the annular groove 3. The valve seat core 4 is set close to the inner side of the annular groove 3. An air passage 5 is formed on one side of the valve seat core 4. The air passage 5 is connected to a channel 7 formed inside the feed end 6. The channel 7 is connected to an air source interface 8 provided on the outer ring of the feed end 6. The valve seat core 4 has an annular bladder 9 in its inner ring. The bladder 9 is set close to the inner ring of the valve seat core 4, and the outer ring of the bladder 9 has an air inlet 10. The air inlet 10 is connected to the air passage 5 on the valve seat core 4. The inner ring of the bladder 9 is tightly attached to the outer ring of the valve core 11 of the valve body 1. In this embodiment, the air-sealed frictionless pneumatic upper valve also includes a cylinder 12 located below the valve body 1, such as... Figure 2 As shown, the upper end face of the cylinder 12 is fixed to the lower part of the valve body 1 through the frame 13. The output end of the cylinder 12 extends through the frame 13 into the valve body 1 and is fixed to the valve stem 14. The upper end of the valve stem 14 is fixed to the valve core 11, which is used to seal the feed end 6 of the valve body 1. In this embodiment, the gas source interface 8 can be connected to an external air pump through a pipe, and the air pump can inject high-pressure gas into the bag 9. The specific operation process of this air-sealed, frictionless pneumatic upward valve is as follows: During the opening process of valve body 1, the external air pump is turned off and the gas in the bladder 9 is released. The bladder 9 elastically contracts into the annular groove 3, and then drives the cylinder 12. The output end of the cylinder 12 pushes the valve rod 14 upward. The valve rod 14 drives the valve core 11 to move upward. The valve core 11 disengages from the feed end 6 of valve body 1, and the feed end 6 is opened. The material in the container enters along the feed end 6 and is discharged from the discharge end of valve body 1. During the process of closing valve body 1, the output end of cylinder 12 pulls down valve rod 14, valve rod 14 drives valve core 11 to move down, valve core 11 moves back to the feed end 6 and seals the feed end 6. Then, an external air pump is driven, and gas flows sequentially along the pipeline, air source interface 8, channel 7, air passage 5 and air inlet 10, and finally is injected into the bladder 9. The inside of the bladder 9 expands due to the high pressure gas, and the inner ring of the bladder 9 is squeezed against the surface of valve core 11. At this time, valve core 11 achieves the sealing of feed end 6 through bladder 9, which can effectively squeeze and seal some residual material in the inner ring of feed end 6. When the valve body 1 is opened again, the bladder 9 shrinks and deforms, making it easier for the crystallized and hardened material to detach from the valve core 11 and the bladder 9, so that subsequent materials can smoothly enter the valve body 1 from the container along the feed end 6. Meanwhile, the outer surface of the valve core 11 has no friction with the inner ring of the feed end 6, and the rigid valve core 11 is sealed to the soft bladder 9, thus avoiding direct friction damage between the rigid valve core 11 and the rigid valve body 1.

[0022] Reference Figure 1 - Figure 12 The cross-section of the bladder body 9 is shaped like two opposing letters "C"; the inner ring of the valve seat core 4 is adapted to the shape of the bladder body 9. The shape of the capsule 9 is designed such that when the capsule 9 is installed in the annular groove 3, the outer ring of the capsule 9 can be fastened to the inner ring of the valve seat core 4, thus fixing and constraining the capsule 9 and the valve seat core 4, improving the stability between the capsule 9 and the valve seat core 4, and allowing the gas injected into the capsule 9 to expand and remain stable in the annular groove 3.

[0023] Reference Figure 1 - Figure 7 The inner top and inner bottom surfaces of the annular groove 3 are provided with annular grooves 15; the upper and lower surfaces of the bladder 9 are provided with annular protrusions 16, which are embedded in the grooves 15. The bladder 9 is installed in the annular groove 3. The two annular protrusions 16 on the bladder 9 are embedded in the first slot 15, which constrains and stabilizes the position between the bladder 9 and the annular groove 3. When the bladder 9 expands and deforms, it is firmly locked in the annular groove 3, so that the deformation of the bladder 9 fully compresses the outer ring of the valve core 11, thereby improving the sealing effect between the bladder 9 and the valve core 11.

[0024] Reference Figure 1 - Figure 12 The valve seat core 4 has a second ring-shaped groove 17 on its upper and lower inner surfaces; the outer ring of the bladder 9 has a second ring-shaped protrusion 18 on its top and bottom inner surfaces, which can be embedded in the second groove 17; the second protrusion 18 and the second groove 17 further strengthen the connection stability between the bladder 9 and the valve seat core 4. The installation process of valve seat core 4 and bladder 9 is as follows: flange 2 is fixed to the feed port end face of valve body 1 by bolts and nuts. When installing valve seat core 4 and bladder 9, flange 2 needs to be removed in advance. Then, valve seat core 4 and bladder 9 are assembled. The outer ring of bladder 9 is wrapped around the inner ring of valve seat core 4, so that the two second protrusions 18 are respectively embedded in the second slot 17. The air inlet 10 of bladder 9 is installed opposite to the air passage 5 on valve seat core 4. Then, valve seat core 4 together with bladder 9 is installed in the annular groove 3 at feed end 6. At this time, the first protrusion 16 on the lower surface of bladder 9 is embedded in the first slot 15 on the bottom surface of the annular groove 3. After installation, flange 2 is installed. The annular groove 3 of flange 2 is installed opposite to the annular groove 3 at feed end 6. At this time, the first protrusion 16 on the upper surface of bladder 9 is embedded in the first slot 15 on the inner top surface. Finally, flange 2 and feed end 6 are fixed together by bolts and nuts. The flange 2 fitting valve body 1 together squeeze the valve seat core 4 and the bladder 9, squeezing the second protrusion 18 on the bladder 9 into the second slot 17, further improving the stability between the bladder 9 and the valve seat core 4.

[0025] Reference Figure 1 - Figure 9 The inner ring of the bladder 9 is provided with a ring-shaped protrusion 19; the outer ring of the valve core 11 is provided with a recess 20 that is adapted to the protrusion 19, and the recess 20 is ring-shaped. The No. 3 protrusion 19 set in the inner ring of the bladder 9 not only serves to further seal, but also scrapes off the material adhering to the outer ring of the valve core 11. The sealing function of the third protrusion 19 is that the third protrusion 19 is pressed against the first recess 20 on the valve core 11 as the bladder 9 expands and deforms, thereby increasing the contact area between the bladder 9 and the valve seat core 4 and thus improving the sealing performance. The scraping action of the third protrusion 19 means that when no gas is injected into the bladder 9, the third protrusion 19 still protrudes from the inner ring surface of the feed end 6 and can directly contact the outer ring of the valve core 11. When the valve body 1 is closed, the valve core 11 moves downward relative to the third protrusion 19, and the third protrusion 19 scrapes away the residual material on the outer ring of the valve core 11, so that the inner ring surface of the bladder 9 can fully contact the outer ring surface of the valve core 11. The final effect is to improve the sealing between the valve core 11 and the bladder 9 and to seal a greater pressure in the sealed container.

[0026] Reference Figure 1 - Figure 9 The bladder body 9 is provided with a sealing rod 21 inside. The sealing rod 21 is arranged opposite to the air inlet 10. One end of the sealing rod 21 is enlarged and fixed to the inner surface of the bladder body 9. The other end of the sealing rod 21 is reduced in diameter and is fitted into the air inlet 10 with a clearance. The outer ring of the valve core 11 is also provided with a second recess 22, which is arranged in a ring shape and the diameter of the second recess 22 is larger than the diameter of the first recess 20. Considering that the stirring and reaction of the materials inside the container may take a long time, the long time will test the stability of the gas pressure inside the capsule 9, that is, the capsule 9 can be in a relatively stable state for a long time without leakage. Therefore, in order to ensure a stable environment inside the capsule 9, a sealing rod 21 and a second recess 22 are provided. When the valve body 1 is closed, the output end of the cylinder 12 makes two strokes. In the first stroke, the first recess 20 on the outer ring of the valve core 11 moves to the position opposite to the third protrusion 19. Then, sufficient gas is injected into the bladder 9. After the second stroke, the second recess 22 on the outer ring of the valve core 11 moves to the position opposite to the third protrusion 19. At this time, the second recess 22 will further squeeze the bladder 9, causing the sealing tube inside the bladder 9 to move towards the air inlet 10. Finally, the sealing tube will be inserted into the air inlet 10, directly sealing the bladder 9. When the valve body 1 is opened, the output end of the cylinder 12 only performs one stroke, the air source interface 8 is in the open state, the cylinder 12 pushes the valve core 11 upward, the valve core 11 directly disengages from the bladder 9, and the bladder 9 deflates and returns to its original state. The sealing rod 21 is directly inserted to seal the air inlet 10, which can stably seal the bladder 9 and keep the bladder 9 in a relatively stable state for a long time.

[0027] Reference Figure 1 - Figure 12 The airway 5 near the bladder 9 is flared out, and the air inlet 10 is provided with a plug 23 outside the hole. The shape of the plug 23 is adapted to the shape of the flared part of the airway 5. The air passage 5 has an flared port, which, together with the insertion part 23, allows the air inlet 10 to quickly connect with the air passage 5 when the bladder 9 and the valve seat core 4 are assembled, and also improves the sealing between the air inlet 10 and the air passage 5.

[0028] Reference Figure 1 - Figure 12 Each of the first protrusions 16 has a liquid storage cavity 24 inside, and each of the first protrusions 16 has a discharge hole 25 on its outer surface. The discharge holes 25 are connected to the liquid storage cavities 24 one by one, and the discharge holes 25 are respectively arranged opposite to the first slot 15. Each of the second protrusions 18 also has a liquid storage cavity 24 inside, and each of the second protrusions 18 has a discharge hole 25 on its outer surface. The discharge holes 25 are connected to the liquid storage cavity 24 one by one, and the discharge holes 25 on the second protrusions 18 are respectively arranged opposite to the second slot 17. The liquid storage chamber 24 can hold liquids such as sealant to seal the gap between flange 2 and bladder 9, as well as the gap between valve seat core 4 and bladder 9, and further seal the gap between feed end 6 and bladder 9. After the valve seat core 4 and the bladder 9 are assembled, the air inlet is connected to the air passage 5. The first protrusion 16 is embedded in the first slot 15, and the second protrusion 18 is embedded in the second slot 17. Then, the flange 2 is installed. The flange 2 squeezes the bladder 9, squeezing out the sealant in the liquid outlet chamber 24. The sealant overflows from the discharge hole 25 into the first slot 15 and the second slot 17, sealing and blocking all the gaps between the flange 2 and the bladder 9, between the valve seat core 4 and the bladder 9, and between the feed end 6 and the bladder 9. This prevents the material in the container from flowing along the gaps, affecting the deformation of the bladder 9, and the sealing between the bladder 9 and the valve core 11.

[0029] Reference Figure 1 - Figure 12 Each of the first slots 15 is provided with a insert 26 adapted to the discharge hole 25, and the first protrusion 16 is embedded in the first slot 15. The insert 26 can be inserted into the discharge hole 25 on the first protrusion 16. Each of the second slots 17 is also provided with multiple inserts 26 that fit the discharge holes 25 on the second protrusion 18; the flange 2 is installed at the feed end 6 position, and the end of the insert 26 is placed in the discharge hole 25, but not completely blocking the discharge hole 25. When the flange 2 initially squeezes the bladder 9, the sealant in the liquid storage chamber 24 flows out. When the flange 2 is tightened and installed in place again, the insert 26 is completely inserted into the discharge hole 25. The insert 26 completely seals the discharge hole 25, which not only limits the overflow of sealant to prevent the sealant overflow from being too large and affecting the bonding and sealing effect, but also the insertion of the insert 26 into the discharge hole 25 can further improve the stability between the bladder 9 and the annular groove 3, as well as between the bladder 9 and the valve seat core 4.

[0030] Reference Figure 1 - Figure 4 The inner wall of the feed end 6 is provided with a ring-shaped limiting ring 27, which is located away from the flange 2. The inner end face of the valve core 11 is provided with a sleeve 28, and the sleeve 28 is provided with a valve stem 14 connected by a spring 29. The limiting ring 27 is used to limit the stroke of the valve core 11 when the valve body 1 is closed, so that the second recess on the valve core 11 can move to the position opposite to the third protrusion 19, ensuring that the second recess 22 squeezes the third protrusion 19; at the same time, the valve stem 14 is connected to the sleeve 28 through the spring 29, which plays a buffering and protective role when the valve stem 14 pulls down the valve core 11.

[0031] Working principle: The specific operation process of the air-sealed frictionless pneumatic expansion valve in this embodiment is as follows: During the opening process of valve body 1, the external air pump is turned off and the gas in the bladder 9 is released. The bladder 9 elastically contracts into the annular groove 3, and then drives the cylinder 12. The output end of the cylinder 12 pushes the valve rod 14 upward. The valve rod 14 drives the valve core 11 to move upward. The valve core 11 disengages from the feed end 6 of valve body 1, and the feed end 6 is opened. The material in the container enters along the feed end 6 and is discharged from the discharge end of valve body 1. During the process of closing valve body 1, the output end of cylinder 12 pulls down valve rod 14, valve rod 14 drives valve core 11 to move down, valve core 11 moves back to the feed end 6 and seals the feed end 6. Then, an external air pump is driven, and gas flows sequentially along the pipeline, air source interface 8, channel 7, air passage 5 and air inlet 10, and finally is injected into the bladder 9. The inside of the bladder 9 expands due to the high pressure gas, and the inner ring of the bladder 9 is squeezed against the surface of valve core 11. At this time, valve core 11 achieves the sealing of feed end 6 through bladder 9, which can effectively squeeze and seal some residual material in the inner ring of feed end 6. When valve body 1 is opened again, bladder 9 shrinks and deforms, making it easier for the crystallized and hardened material to detach from valve core 11 and bladder 9, allowing subsequent material to smoothly enter the interior of valve body 1 from inside the container along feed end 6.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gas-sealed, frictionless pneumatic top-mounted valve, comprising a valve body (1), characterized in that: The valve body (1) has a flange (2) at the feed end (6) position. An annular groove (3) is opened in the inner ring between the flange (2) and the feed end (6). A valve seat core (4) is provided in the annular groove (3). The valve seat core (4) is set close to the inner side of the annular groove (3). An air passage (5) is opened on one side of the valve seat core (4). The air passage (5) is connected to the channel (7) opened inside the feed end (6). The channel (7) is connected to the air source interface (8) set on the outer ring of the feed end (6). The valve seat core (4) has an annular bladder (9) in the inner ring. The bladder (9) is closely attached to the inner ring of the valve seat core (4), and the outer ring of the bladder (9) has an air inlet (10). The air inlet (10) is connected to the air passage (5) on the valve seat core (4). The inner ring of the bladder (9) is closely attached to the outer ring of the valve core (11) of the valve body (1). The cross-section of the bladder (9) is shaped like two opposing letters "C"; the inner ring of the valve seat core (4) is adapted to the shape of the bladder (9); The inner top and inner bottom surfaces of the annular groove (3) are provided with a first groove (15) in the shape of an annular shape; the upper and lower surfaces of the bladder (9) are provided with a first protrusion (16) in the shape of an annular shape, and the first protrusion (16) is embedded in the first groove (15). The valve seat core (4) has a ring-shaped second slot (17) on its upper and lower surfaces; the outer ring of the bladder (9) has a ring-shaped second protrusion (18) on its top and bottom surfaces, which can be embedded in the second slot (17). The inner ring of the bladder (9) is provided with a ring-shaped protrusion No. 3 (19); the outer ring of the valve core (11) is provided with a recess No. 1 (20) adapted to the protrusion No. 3 (19), and the recess No. 1 (20) is ring-shaped. The bladder (9) is provided with a sealing rod (21) inside. The sealing rod (21) is arranged opposite to the air inlet (10). One end of the sealing rod (21) is enlarged and fixed to the inner surface of the bladder (9). The other end of the sealing rod (21) is reduced in diameter and fits into the air inlet (10) with a clearance. The outer ring of the valve core (11) is also provided with a second recess (22). The second recess (22) is arranged in a ring shape and the diameter of the second recess (22) is larger than the diameter of the first recess (20). When the valve body (1) is closed, the output end of the cylinder (12) performs two strokes. The first stroke is when the first recess (20) on the outer ring of the valve core (11) moves to the position opposite to the third protrusion (19). Then, sufficient gas is injected into the bladder (9). Then, the second stroke is performed, so that the second recess (22) on the outer ring of the valve core (11) moves to the position opposite to the third protrusion (19). At this time, the second recess (22) will further squeeze the bladder (9), so that the sealing rod (21) inside the bladder (9) moves towards the air inlet (10). Finally, the sealing rod (21) will be inserted into the air inlet (10) and directly seal the bladder (9). The inner wall of the feed end (6) is provided with a ring-shaped limiting ring (27). The limiting ring (27) is set away from the flange (2) to limit the stroke of the valve core (11) when the valve body (1) is closed, so that the second recess on the valve core (11) can move to the position opposite to the third protrusion (19) to ensure the compression of the third protrusion (19) by the second recess (22). The inner end face of the valve core (11) is provided with a sleeve (28), and the sleeve (28) is provided with a valve stem (14) connected by a spring (29).

2. The air-sealed frictionless pneumatic top-mounting valve according to claim 1, characterized in that: The airway (5) port near the bladder (9) is flared, and the air inlet (10) is provided with a plug (23) at the outside of the hole. The shape of the plug (23) is adapted to the shape of the flared part of the airway (5).

3. The air-sealed frictionless pneumatic top-mounting valve according to claim 2, characterized in that: Each of the first protrusions (16) has a liquid storage cavity (24) inside, and each of the first protrusions (16) has a discharge hole (25) on its outer surface. The discharge holes (25) are connected to the liquid storage cavities (24) one by one, and the discharge holes (25) are respectively set opposite to the first slot (15).

4. The air-sealed frictionless pneumatic top-mounting valve according to claim 3, characterized in that: Each of the first slots (15) is provided with a insert (26) adapted to the discharge hole (25), and the first protrusion (16) is embedded in the first slot (15). The insert (26) can be inserted into the discharge hole (25) on the first protrusion (16).

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