Sealing structure of AB valve

Abstract

The utility model provides a sealing structure of an AB valve, which comprises a main valve body, a main valve plate, a sealing structure and a sealing structure, an auxiliary valve plate matched with the main valve plate is arranged on the auxiliary valve body; a locking assembly; a sealing ring; and an inflation assembly. According to the sealing structure of the AB valve, the locking assembly is used for enabling the main valve body and the auxiliary valve body to be matched, during material conveying, the air inflation assembly is used for deflating the sealing ring so that a gap can be formed between the sealing ring and the main valve plate or the auxiliary valve plate, the main valve plate or the auxiliary valve plate can be turned over to conduct material conveying operation, meanwhile, damage to the sealing ring is reduced, and when material conveying is stopped, the sealing ring is not damaged. The main valve plate and the auxiliary valve plate are turned over to be located at the position of the sealing ring, the sealing ring is inflated through the inflation assembly, so that the main valve body or the auxiliary valve body forms an independent sealing valve body, and then a product is stored in a high sterile space all the time; and the design of the inflation assembly is matched with the sealing ring structure on the main valve body, so that the higher sealing grade requirement can be met.

Description

TECHNICAL FIELD

[0001] The utility model relates to AB valve technical field, concretely relates to a sealing structure of AB valve. BACKGROUND

[0002] AB valve realizes two sterile environments mainly transmission, is often used in pharmaceutical industry, through the sterile mode makes the drug transfer to reduce the pollution of microorganism to the drug, and further improves the stability and quality of drug.

[0003] AB valve is also called "split type butterfly valve", mainly by alpha valve (active valve) and beta valve (passive valve) are composed, in the process of conveying, alpha valve and beta valve butt joint through fastener connection as a whole, subsequently open the valve and convey, and the valve is closed when the conveying is finished, at this moment, two separate sealing valve bodies are separated, so as to improve the sealing of the product.

[0004] But in the process of using AB valve sterile transfer, some drug powder will be left between the valve of AB valve, and with the increase of drug transfer frequency, the number of valve opening and closing increases, and the sealing ring is inevitably dry ground in the process of valve turning, so as to cause the wear of sealing ring, and further cause the poor contact effect of valve and sealing ring, so as to reduce the sealing of valve body and affect the effect of sterile transfer. UTILITY MODEL CONTENTS

[0005] The utility model aims at solving the problem of AB valve sealing in view of the above problems existing in prior art.

[0006] In order to realize the above object, the utility model can realize through the following technical scheme: a sealing structure of AB valve, comprising:

[0007] Main valve body, the main valve body is provided with main valve plate;

[0008] Auxiliary valve body, the auxiliary valve body is provided with auxiliary valve plate matched with the main valve plate;

[0009] Locking assembly, the locking assembly is arranged between the main valve body and auxiliary valve body, so that the main valve body and auxiliary valve body are clamped together;

[0010] Sealing ring, the sealing ring is arranged on the main valve body and auxiliary valve body respectively, and is matched with the main valve plate and auxiliary valve plate, and the sealing ring is provided with airflow channel;

[0011] Inflating assembly, the inflating assembly is communicated with the airflow channel of the sealing ring, so as to control the inflation or deflation of the sealing ring.

[0012] The utility model discloses an embodiment, the support part is provided on the sealing ring, the pipe body that is communicated with the inflation assembly is provided on the support part, and the both sides of the support part are provided with the inclined part, and the inclined part is matched with the main valve body or the auxiliary valve body.

[0013] An embodiment of the utility model discloses that the arc shape part is provided on the sealing ring, and the abutment part is arranged between the two arc shape parts, and the abutment part is abutted with the main valve plate or the auxiliary valve plate.

[0014] An embodiment of the utility model discloses that the locking assembly includes first clamping block, second clamping block, third clamping block, fourth clamping block and locking handle, the first clamping block and second clamping block are fixed on the main valve body, and the third clamping block and fourth clamping block are fixed on the auxiliary valve body.

[0015] The locking handle is provided with the clamping rod, and the clamping rod penetrates the third clamping block and fourth clamping block and is located between the first clamping block and second clamping block and is locked and fixed.

[0016] An embodiment of the utility model discloses that the support block is arranged between the first clamping block and second clamping block, and the outlet slide, the second slide and the first slide that are communicated with each other from high to low are sequentially arranged on the support block.

[0017] The clamping rod is provided with the circular truncated cone that slides in the support block to control the main valve body and auxiliary valve body to realize locking, clearance or separation.

[0018] An embodiment of the utility model discloses that the circular truncated cone is located on the second slide, so that the main valve body and auxiliary valve body appear clearance to form a sterilization space, the steam inlet and condensate outlet that are communicated with the sterilization space are respectively arranged on the main valve body, and the sterilization O type ring is arranged between the main valve body and the auxiliary valve body.

[0019] An embodiment of the utility model discloses that the main shaft flange is arranged on the main valve body, the handle switch that is clamped with the main valve plate is arranged on the main shaft flange, and the limiting table is arranged on the main shaft flange.

[0020] The auxiliary shaft flange that is matched with the auxiliary valve plate is arranged on the auxiliary valve body, and the protective cover is arranged on the auxiliary shaft flange.

[0021] An embodiment of the utility model discloses that the conical support part is arranged on the main valve plate and the auxiliary valve plate.

[0022] An embodiment of the utility model discloses that the inflation assembly includes inflation cover, and the inflation button, exhaust button and air pipe are respectively arranged on the inflation cover, the inflation sealing ring connecting port that is communicated with the sealing ring is arranged between the inflation button and exhaust button, and the inflation button is matched with the air pipe.

[0023] The utility model discloses an embodiment, the main valve plate and the vice valve plate all are provided with the conical support part, be provided with the card station that the handle switch is engaged with on the conical support part.

[0024] Compared with the prior art, the application has the following advantages: the main valve body and the auxiliary valve body are matched by the locking assembly; when conveying material, the sealing ring is deflated by the inflation assembly to form a gap between the sealing ring and the main valve plate or the auxiliary valve plate, which facilitates the overturning of the main valve plate or the auxiliary valve plate for conveying material and reduces the damage caused by dry grinding of the sealing ring; when stopping conveying material, the main valve plate and the auxiliary valve plate are turned over to the sealing ring, and the sealing ring is inflated by the inflation assembly to form an independent sealing valve body, which solves the problem of hard sealing of the traditional AB valve, avoids the wear and tear of the sealing ring and the pollution caused by the wear and tear of the sealing ring falling into the material, and further enables the product to be conveyed in a higher sterile space at all times. The design of the inflation assembly and the structure of the sealing ring on the main valve body can meet higher airtightness requirements. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is the structure schematic diagram of the main body front face;

[0026] Figure 2 is the back structure schematic diagram of the main valve body and the auxiliary valve body split;

[0027] Figure 3 is the part split structure schematic diagram on the main valve body;

[0028] Figure 4 is the part split structure schematic diagram on the auxiliary valve body;

[0029] Figure 5 is the main body plane schematic diagram under the sterilization state;

[0030] Figure 6 is Figure 5 the removal cross-sectional view F-F in;

[0031] Figure 7 is Figure 6 the enlarged view of A part in;

[0032] Figure 8 is the connection assembly schematic diagram of the sealing ring and the pipe body;

[0033] Figure 9 is the internal part structure schematic diagram of the locking assembly on the main body split;

[0034] Figure 10 is the part explosion structure schematic diagram of the locking assembly;

[0035] Figure 11 is the main body half cut plane schematic diagram of the main valve body and the auxiliary valve body in the valve plate open state.

[0036] Figure 12 is the structural schematic view of the main valve plate and the auxiliary valve plate;

[0037] Figure 13 is the internal part assembly structural schematic view of the partial section of the inflation cover in the inflation assembly;

[0038] Figure 14 is Figure 13 the enlarged view of B part in the figure.

[0039] Explanation of reference signs:

[0040] 1, main body;

[0041] 2, main valve body;21, handle switch;22, main valve plate;23, switch bolt;24, main shaft flange;241, limiting table;25, condensate outlet;26, steam inlet;

[0042] 3, locking assembly;31, first clamping block;32, second clamping block;33, locking handle;331, boss;34, third clamping block;35, fourth clamping block;36, clamping rod;361, circular table;362, square block;37, supporting block;371, first slide;372, second slide;373, outlet slide;

[0043] 4, auxiliary valve body;41, protective cover;42, auxiliary valve plate;43, auxiliary shaft flange;

[0044] 5, inflation assembly;51, inflation cover;52, inflation button;53, exhaust button;54, air pipe;55, inflation sealing ring connecting port;

[0045] 6, sealing ring;61, arc-shaped part;62, fitting part;63, pipe body;64, air flow channel;65, supporting part;66, inclined part;

[0046] 7, sterilization O-shaped ring;71, sterilization space;91, clamping table;92, light rod part;93, conical supporting part. DETAILED DESCRIPTION

[0047] The following is a specific embodiment of the present application and further describes the technical scheme of the present application in combination with the drawings.

[0048] As Figures 1-14 shown, a sealing structure of an AB valve comprises:

[0049] main valve body 2, the main valve body 2 is provided with a main valve plate 22;

[0050] auxiliary valve body 4, the auxiliary valve body 4 is provided with an auxiliary valve plate 42 matched with the main valve plate 22;

[0051] Locking assembly 3, locking assembly 3 is arranged between main valve body 2 and auxiliary valve body 4, so that main valve body 2 and auxiliary valve body 4 are engaged;

[0052] Sealing ring 6, sealing ring 6 is arranged on main valve body 2 and auxiliary valve body 4 respectively, and cooperates with main valve plate 22 and auxiliary valve plate 42, and airflow passage 64 is formed in sealing ring 6;

[0053] Inflation assembly 5, inflation assembly 5 is connected with airflow passage 64 of sealing ring 6, so as to control inflation or deflation of sealing ring 6.

[0054] Specifically, main valve body 2 and auxiliary valve body 4 are engaged, and then locking assembly 3 is used to lock them, so as to form a main body 1, wherein main valve body 2 is an alpha valve (active valve), and auxiliary valve body 4 is a beta valve (passive valve), when not conveying material, main valve body 2 and auxiliary valve body 4 are both independent sealing valve bodies, at this time, sealing ring 6 is in an inflated state and abuts against main valve plate 22 or auxiliary valve plate 42, so as to improve the sealing effect of the two sealing valve bodies, and the pressure resistance of a single valve body can reach 1bar-2bar, when conveying material, main valve body 2 is engaged on auxiliary valve body 4, and locking assembly 3 is used to lock, so that main valve plate 22 and auxiliary valve plate 42 abut against each other, inflation assembly 5 deflates sealing ring 6, at this time, sealing ring 6 shrinks and generates a gap with main valve plate 22 or auxiliary valve plate 42, so that main valve plate 22 pushes auxiliary valve plate 42 to flip, so as to realize aseptic conveying, meanwhile, the retracted sealing ring 6 reduces the wear of sealing ring 6 caused by dry grinding sealing with main valve plate 22 or auxiliary valve plate 42, so as to prevent the sealing ring 6 from separating into the material and causing pollution, and improve the service life and sealing effect of sealing ring 6, wherein sealing ring 6 is divided into two groups and is engaged on main valve body 2 or auxiliary valve body 4.

[0055] As a further provided embodiment of the utility model, support part 65 is arranged on sealing ring 6, pipe body 63 connected with inflation assembly 5 is arranged on support part 65, and inclined part 66 is arranged on both sides of support part 65, and inclined part 66 cooperates with main valve body 2 or auxiliary valve body 4.

[0056] Specifically, the cross section of support part 65 is T-shaped (as shown in Figure 7 , and inclined part 66 is arranged on both sides of support part 65, and support part 65 and inclined part 66 are used to improve the connection and fixing effect of sealing ring 6 with main valve body 2 or auxiliary valve body 4, when inflating sealing ring 6, pipe body 63 guides the gas in inflation assembly 5 into sealing ring 6, so that sealing ring 6 expands and abuts against main valve plate 22 and auxiliary valve plate 42, and then the sealing effect of main valve body 2 and auxiliary valve body 4 is improved.

[0057] As a further provided embodiment of the utility model, the sealing ring 6 is symmetrically provided with arc-shaped portions 61, and a fitting portion 62 is arranged between the two arc-shaped portions 61, and the fitting portion 62 abuts against the main valve plate 22 or the auxiliary valve plate 42.

[0058] Specifically, during the inflation process of the sealing ring 6, the gas enters the airflow channel 64, at this time, the sealing ring 6 will be extruded and expanded by the gas, and the arc-shaped portion 61 will abut against the annular outer wall of the main valve plate 22 or the auxiliary valve plate 42 in advance, and the fitting portion 62 will gradually approach the annular outer wall during inflation, and because there is air at the fitting portion 62, the two arc-shaped portions 61 will extend outward, so as to increase the fitting area of the sealing ring 6 and further improve the sealing effect on the main valve plate 22 and the auxiliary valve plate 42.

[0059] As a further provided embodiment of the utility model, the locking assembly 3 comprises first clamping blocks 31, second clamping blocks 32, third clamping blocks 34, fourth clamping blocks 35 and a locking handle 33, the first clamping blocks 31 and the second clamping blocks 32 are fixed on the main valve body 2, the third clamping blocks 34 and the fourth clamping blocks 35 are fixed on the auxiliary valve body 4.

[0060] Among them, the locking handle 33 is provided with a clamping rod 36, the clamping rod 36 penetrates through the third clamping block 34 and the fourth clamping block 35 and is located between the first clamping block 31 and the second clamping block 32 to be locked and fixed, and a square block 362 is arranged at the end of the clamping rod 36, and the locking handle 33 is clamped on the square block 362 and cooperates with the clamping rod 36.

[0061] Specifically, the first clamping block 31 and the second clamping block 32 form a group, and there is a gap between the first clamping block 31 and the second clamping block 32 to form a first mounting space, and a mounting plate on the outer side of the main valve body 2 is fixed in the first mounting space, the third clamping block 34 and the fourth clamping block 35 form a group, and there is a gap between the third clamping block 34 and the fourth clamping block 35 to form a second mounting space, and the auxiliary valve plate 42 is fixed at the second mounting space, and one end of the clamping rod 36 is located at the third clamping block 34 and the fourth clamping block 35 to rotate, and the other end can be clamped in the first mounting space, so that the main valve body 2 and the auxiliary valve body 4 are clamped and locked.

[0062] As a further provided embodiment of the utility model, a support block 37 is arranged between the first clamping block 31 and the second clamping block 32, and a high-to-low interconnected outlet slide 373, a second slide 372 and a first slide 371 are sequentially arranged on the support block 37.

[0063] A circular table 361 is arranged on the clamping rod 36 and slides in the support block 37, so as to control the locking, gap or separation of the main valve body 2 and the auxiliary valve body 4.

[0064] Specifically, the support block 37 is clamped between the first clamping block 31 and the second clamping block 32, when locking, the circular table 361 on the clamping rod 36 will slide along the outlet slide 373 and the second slide 372 to the first slide 371 in turn, at this time, the main valve body 2 and the auxiliary valve body 4 are clamped and locked, and the material conveying operation can be carried out, when sterilizing, the circular table 361 will slide along the first slide 371 to the second slide 372, the boss 331 of the locking handle 33 will be clamped into the circular groove of the third clamping block 34, so as to give the locking handle 33 a certain abutting effect, the boss 331 can be telescopic in the locking handle 33, at this time, there is a gap between the main valve body 2 and the auxiliary valve body 4, but the main valve body 2 and the auxiliary valve body 4 are still in a connected and sealed state and have not been completely separated, so as to facilitate the steam sterilization of the plate surface of the main valve plate 22 and the auxiliary valve plate 42, when separating, the circular table 361 on the clamping rod 36 slides along the second slide 372 to the outlet slide 373, the auxiliary valve body 4 can be pulled out of the main valve body 2 through the locking handle 33, and at the same time, the circular table 361 will slide upward in the vertical direction to be separated from the support block 37, further, the outlet slide 373 is a vertical slide, and the slide opening of the outlet slide 373 faces the second slide 372, the second slide 372 is arc-shaped and communicates with the first slide 371, so that the first slide 371 is the lowest point and the outlet slide 373 is the highest point (as shown in Figure 10 , and arc-shaped walls are arranged between the first slide 371 and the second slide 372 and between the second slide 372 and the outlet slide 373, so as to facilitate the sliding of the circular table 361.

[0065] As a further provided embodiment of the utility model, the circular table 361 is located on the second slide 372, so that a gap is formed between the main valve body 2 and the auxiliary valve body 4 to form a sterilization space 71, the main valve body 2 is respectively provided with a steam inlet 26 and a condensed water outlet 25 which communicate with the sterilization space 71, and a sterilization O-shaped ring 7 is arranged between the main valve body 2 and the auxiliary valve body 4.

[0066] Specifically, when the circular table 361 slides to the second slide 372, a gap is formed between the main valve body 2 and the auxiliary valve body 4 to form a sterilization space 71, high-temperature steam enters the sterilization space 71 through the steam inlet 26 to perform steam sterilization on the plate surface of the main valve plate 22 and the auxiliary valve plate 42, and the sterilized gas is discharged through the condensed water outlet 25, so as to facilitate subsequent aseptic transmission of products and improve the aseptic transmission effect, further, the main valve body 2 and the auxiliary valve body 4 are not completely separated during the steam sterilization process, and the sterilization O-shaped ring 7 is arranged between the two valve bodies to improve the sealing effect of the sterilization space 71, wherein the steam flow direction is as shown in Figure 13 , which enters from the C end and is discharged from the D end.

[0067] As the further provided embodiment of the utility model, the main valve body 2 is provided with a main shaft flange 24, the main shaft flane 24 is provided with a handle switch 21 clamped with the main valve plate 22, and the main shaft flange 24 is provided with a limiting platform 241;

[0068] The auxiliary valve body 4 is provided with an auxiliary shaft flange 43 matched with the auxiliary valve plate 42, and the auxiliary shaft flange 43 is provided with a protective cover 41.

[0069] Specifically, the handle switch can control the rotation of the main valve plate 22, that is, the opening and closing of the main valve body 2 and the auxiliary valve body 4, the main shaft flange 24 is fixed on the main valve body 2 through bolts, the limiting platform 241 limits the rotation angle of the handle switch, the auxiliary shaft flange 43 is fixed on the auxiliary valve body 4 through bolts, and the auxiliary valve plate 42 rotates on the auxiliary shaft flange 43, the protective cover plays a protective effect on the auxiliary valve plate 42, and further, the handle switch 21 is provided with a switch latch 23 to lock the main valve plate 22.

[0070] As the further provided embodiment of the utility model, the main valve plate 22 and the auxiliary valve plate 42 are both provided with a tapered support part 93.

[0071] Specifically, the main valve plate 22 and the auxiliary valve plate 42 are both composed of a plate body, a tapered support part 93, a polished rod part 92 and a clamping platform 91, the plate body is circular and matched with the main valve body 2 or the auxiliary valve body 4, and the cross section of the tapered support part 93 is triangular, the stable structure of the triangle can improve the connection effect of the polished rod part 92 and the plate body, and the clamping platform 91 can drive the main valve plate 22 to rotate by connecting with the handle switch.

[0072] As the further provided embodiment of the utility model, the inflation assembly 5 includes an inflation cover 51, the inflation cover 51 is provided with an inflation button 52, an exhaust button 53 and an air pipe 54 respectively, the inflation button 52 and the exhaust button 53 are provided with an inflation sealing ring connecting port 55 communicated with the sealing ring 6, and the inflation button 52 is matched with the air pipe 54.

[0073] Specifically, the inflation cover 51 is attached to the main valve body 2 or the auxiliary valve body 4 to form an installation space, the installation space is provided with the inflation button 52, the air pipe 54 and the exhaust button 53 respectively, the air pipe 54 is connected with an air source, when the inflation button 52 is pressed, the gas will be discharged from the inflation sealing ring connecting port 55 into the pipe body 63 along the connecting end of the inflation button 52, and then filled into the sealing ring 6 along the pipe body 63, so that the sealing ring 6 expands against the main valve plate 22 or the auxiliary valve plate 42 to form a higher sealing effect, but when the sealing ring 6 needs to be exhausted, the exhaust button 53 is pressed, at this time, the gas in the sealing ring 6 is discharged, so that the sealing ring 6 is in a contracted state.

[0074] The utility model further discloses a sealing method on the AB valve sealing structure, and specifically comprises the following steps:

[0075] SO1, the main valve body 2 is assembled to the auxiliary valve body 4 and locked by the locking assembly 3, so that the main valve plate 22 abuts against the auxiliary valve plate 42, at this time, the abutting plate surfaces of the main valve plate 22 and the auxiliary valve plate 42 are not sterilized;

[0076] SO2, the deflation button is pressed to deflate the sealing ring 6, at this time, the sealing ring 6 has a gap with the main valve plate 22 and the auxiliary valve plate 42, and then the handle switch 21 controls the main valve plate 22 to link the auxiliary valve plate 42 to overturn to transport materials;

[0077] SO3, after the material transportation is completed, the handle switch 21 drives the main valve plate 22 and the auxiliary valve plate 42 to be flush with the sealing ring 6, and then the inflation button 52 is pressed, the gas enters from the gas pipe 54 and fills into the sealing ring 6 along the inflation sealing ring connecting port 55;

[0078] SO4, the arc-shaped part 61 and the abutting part 62 of the sealing ring 6 are expanded by the gas to abut against the annular outer wall of the main valve plate 22 or the auxiliary valve plate 42, so that the main valve body 2 and the auxiliary valve body 4 form independent sealing valve bodies.

[0079] The above technical scheme of the utility model, aiming at the too single technical problem of the prior art solution, provides a solution significantly different from the prior art, and the parts not involved in the technical scheme of the application are the same as or can be realized by the prior art, and will not be described here.

[0080] The technical scheme in the above embodiment has clearly and completely described the content of the utility model, obviously, the described embodiment is only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

Claims

1. A sealing structure for an AB valve, characterized in that, include: Main valve body (2), on which a main valve plate (22) is provided; A secondary valve body (4) is provided with a secondary valve plate (42) that cooperates with the main valve plate (22); A locking assembly (3) is disposed between the main valve body (2) and the auxiliary valve body (4) to engage the main valve body (2) and the auxiliary valve body (4); A sealing ring (6) is respectively disposed on the main valve body (2) and the auxiliary valve body (4) and cooperates with the main valve plate (22) and the auxiliary valve plate (42). An airflow channel (64) is provided in the sealing ring (6). An inflation assembly (5) is connected to the airflow channel (64) of the sealing ring (6) to control the inflation or deflation of the sealing ring (6).

2. The sealing structure of an AB valve according to claim 1, characterized in that, The sealing ring (6) is provided with a support part (65), and the support part (65) is provided with a tube (63) that communicates with the inflation assembly (5). Inclined parts (66) are provided on both sides of the support part (65), and the inclined parts (66) cooperate with the main valve body (2) or the auxiliary valve body (4).

3. The sealing structure of an AB valve according to claim 1 or 2, characterized in that, The sealing ring (6) is symmetrically provided with arc-shaped portions (61), and a fitting portion (62) is provided between the two arc-shaped portions (61). The fitting portion (62) abuts against the main valve plate (22) or the auxiliary valve plate (42).

4. The sealing structure of an AB valve according to claim 1, characterized in that, The locking assembly (3) includes a first locking block (31), a second locking block (32), a third locking block (34), a fourth locking block (35), and a locking handle (33). The first locking block (31) and the second locking block (32) are fixed to the main valve body (2), and the third locking block (34) and the fourth locking block (35) are fixed to the auxiliary valve body (4). The locking handle (33) is provided with a locking rod (36), which passes through the third locking block (34) and the fourth locking block (35) and is located between the first locking block (31) and the second locking block (32) for locking and fixing.

5. The sealing structure of an AB valve according to claim 4, characterized in that, A support block (37) is provided between the first card block (31) and the second card block (32). The support block (37) is provided with an outlet slide (373), a second slide (372) and a first slide (371) that are connected to each other from high to low. The lever (36) is provided with a frustum (361) that slides within the support block (37) to control the main valve body (2) and the auxiliary valve body (4) to lock, gap, or separate.

6. The sealing structure of an AB valve according to claim 5, characterized in that, The truncated cone (361) is located on the second slide (372), creating a gap between the main valve body (2) and the auxiliary valve body (4) to form a sterilization space (71). The main valve body (2) is provided with a steam inlet (26) and a condensate outlet (25) that are connected to the sterilization space (71). A sterilization O-ring (7) is provided between the main valve body (2) and the auxiliary valve body (4).

7. The sealing structure of an AB valve according to claim 1, characterized in that, The main valve body (2) is provided with a main shaft flange (24), and the main shaft flange (24) is provided with a handle switch (21) that engages with the main valve plate (22). The main shaft flange (24) is provided with a limit platform (241). The secondary valve body (4) is provided with a secondary shaft flange (43) that cooperates with the secondary valve plate (42), and a protective cover (41) is provided on the secondary shaft flange (43).

8. The sealing structure of an AB valve according to claim 7, characterized in that, Both the main valve plate (22) and the secondary valve plate (42) are provided with tapered support parts (93).

9. The sealing structure of an AB valve according to claim 1, characterized in that, The inflation assembly (5) includes an inflation cover (51), on which an inflation button (52), an exhaust button (53), and an air pipe (54) are respectively provided. An inflation sealing ring connection port (55) communicating with the sealing ring (6) is provided between the inflation button (52) and the exhaust button (53). The inflation button (52) cooperates with the air pipe (54).

10. The sealing structure of an AB valve according to claim 7, characterized in that, Both the main valve plate (22) and the secondary valve plate (42) are provided with a conical support part (93), and the conical support part (93) is provided with a locking platform (91) that engages with the handle switch (21).

Images