Corrosion-resistant sealing valve

Abstract

The present invention discloses a corrosion-resistant sealing valve, which relates to the field of valve body technology, wherein the corrosion-resistant sealing valve includes a valve body and a sealing structure, the valve body is formed with a valve cavity and a mounting hole connected to the valve cavity, and the direction from one end of the mounting hole close to the valve cavity toward the other end of the mounting hole away from the valve cavity is defined as a first direction, and the inner diameter of the mounting hole gradually decreases along the first direction; the sealing structure includes a built-in valve cover, a sealing ring, and an elastic member, the built-in valve cover is in sliding contact with the inner wall of the mounting hole, the outer wall of the built-in valve cover gradually shrinks along the first direction, and the outer diameter of the end of the built-in valve cover away from the valve cavity is larger than the inner diameter of the end of the mounting hole away from the valve cavity; the sealing ring is sleeved on the built-in valve cover and is in contact with the hole wall of the mounting hole; the elastic member passes through the mounting hole, and the two ends of the elastic member are respectively connected to the valve body and the built-in valve cover. The technical solution of the present invention is to extend the service life of the corrosion-resistant sealing valve.

Description

Technical Field

[0001] The present invention relates to the technical field of valve bodies, and in particular to a corrosion-resistant sealing valve. Background Art

[0002] In the field of fluid control, valves are key equipment, and their sealing performance is directly related to the safety and reliability of the system. Traditional valve sealing structures usually use a single sealing ring in conjunction with the valve body, and the sealing effect is achieved by external force pressing the sealing ring.

[0003] However, the sealing ring on the valve body is exposed to the fluid environment in the valve cavity. The contact area between the sealing ring and the fluid in the valve cavity is large and is easily corroded by the fluid. The material of the sealing ring will be eroded quickly, causing the sealing performance to deteriorate too quickly, thereby significantly shortening the service life of the valve. Summary of the Invention

[0004] The main purpose of the present invention is to provide a corrosion-resistant sealing valve, aiming to extend the service life of the valve.

[0005] To achieve the above-mentioned purpose, the corrosion-resistant sealing valve proposed in the present invention comprises:

[0006] a valve body, the valve body being formed with a valve cavity and a mounting hole communicating with the valve cavity, wherein a direction extending from an end of the mounting hole close to the valve cavity toward an end of the mounting hole away from the valve cavity is defined as a first direction, and an inner diameter of the mounting hole gradually decreases along the first direction; and

[0007] A sealing structure, which includes a built-in valve cover, a sealing ring and an elastic member, wherein the built-in valve cover is in sliding contact with the inner wall of the mounting hole, the outer wall of the built-in valve cover gradually shrinks along the first direction, and the outer diameter of the end of the built-in valve cover away from the valve cavity is larger than the inner diameter of the end of the mounting hole away from the valve cavity; the sealing ring is sleeved on the built-in valve cover and in contact with the hole wall of the mounting hole; the elastic member passes through the mounting hole, and the two ends of the elastic member are respectively connected to the valve body and the built-in valve cover.

[0008] In one embodiment, a latch hole is formed on an inner wall of one end of the mounting hole closer to the rear in the first direction, and a latch hook is formed on the built-in valve cover. The latch hook is configured to be latched with the latch hole.

[0009] In one embodiment, the hook is formed with two protrusions on opposite sides along the first direction, and a sliding groove adapted to the hook is formed on the hole wall of the mounting hole; the sliding groove extends along the first direction, and the hook slides within the sliding groove.

[0010] In one embodiment, a cross bar is formed at the slot opening of the sliding slot at one end thereof closer to the rear along the first direction, and the cross bar and the slot wall of the sliding slot are combined to form the latching hole.

[0011] In one embodiment, the sealing structure further includes a push rod, which passes through the mounting hole and is disposed on a side of the built-in valve cover facing away from the valve cavity; the push rod is configured to allow a user to move the built-in valve cover.

[0012] In one embodiment, the sealing structure further comprises an outer valve cover, which is detachably connected to the valve body and configured to cover an opening of the mounting hole at one end away from the valve cavity.

[0013] In one embodiment, the outer valve cover is provided with an avoidance hole for the push rod to pass through.

[0014] In one embodiment, the push rod is rotatably connected to the hole wall of the avoidance hole, and is telescopically connected to the built-in valve cover.

[0015] In one embodiment, the avoidance hole is arranged to gradually shrink along the first direction;

[0016] The push rod is rotatably connected to the hole wall of the avoidance hole at one end away from the built-in valve cover; the push rod is configured to block the end of the avoidance hole away from the built-in valve cover.

[0017] In one embodiment, the sealing ring is made of polytetrafluoroethylene.

[0018] In the technical solution of the present invention, the corrosion-resistant sealing valve includes a valve body and a sealing structure, the valve body is formed with a valve cavity and a mounting hole connected to the valve cavity, and the direction from one end of the mounting hole close to the valve cavity toward the other end of the mounting hole away from the valve cavity is defined as a first direction, and the inner diameter of the mounting hole gradually decreases along the first direction; the sealing structure includes a built-in valve cover, a sealing ring and an elastic member, the built-in valve cover is in sliding contact with the inner wall of the mounting hole, the outer wall of the built-in valve cover gradually shrinks along the first direction, and the outer diameter of the end of the built-in valve cover away from the valve cavity is larger than the inner diameter of the end of the mounting hole away from the valve cavity; the sealing ring is sleeved on the built-in valve cover and abuts against the hole wall of the mounting hole; the elastic member passes through the mounting hole, and the two ends of the elastic member are respectively connected to the valve body and the built-in valve cover. In the technical solution of the present invention, the contraction force of the elastic member can continuously pull the built-in valve cover in the first direction, and with the help of the tapered hole wall of the mounting hole that gradually shrinks along the first direction, a radial component force is generated, which continuously presses the sealing ring against the hole wall of the mounting hole, thereby squeezing the sealing ring as a whole between the built-in valve cover and the valve body, leaving only an extremely narrow annular gap in contact with the valve cavity fluid, reducing the contact area between the effectively sealed part of the sealing ring and the fluid, thereby reducing the rate at which the sealing ring is corroded by the fluid; at the same time, after the part of the sealing ring in contact with the fluid is corroded, the elastic member can be further compressed, automatically compensating for the pulling force on the built-in valve cover in the first direction, so that the sealing ring can maintain its sealing effect; in summary, such a design can extend the service life of the corrosion-resistant sealing valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0020] Figure 1 A schematic structural diagram of an embodiment of a corrosion-resistant sealing valve provided by the present invention;

[0021] Figure 2 This is a structural diagram of another embodiment of a corrosion-resistant sealing valve;

[0022] Figure 3 for Figure 2 Sectional view along AA;

[0023] Figure 4 for Figure 3 A partial enlarged view of point B in the middle;

[0024] Figure 5 This is a schematic diagram of the structure of the slideway in the corrosion-resistant sealing valve;

[0025] Figure 6 for Figure 5 A partial enlarged view of point C in the middle;

[0026] Figure 7 This is a schematic diagram of the structure of the built-in valve cover in the corrosion-resistant sealing valve;

[0027] Figure 8 It is a schematic diagram of the structure of the outer and inner valve covers of the corrosion-resistant sealing valve.

[0028] Description of Figure Numbers:

[0029] 1000. Corrosion-resistant sealing valve; 1. Valve body; 1a. Valve chamber; 1b. Mounting hole; 1b1. Clamping hole; 1b2. Slide groove; 11. Cross bar; 21. Internal valve cover; 211. Hook; 2111. Protrusion; 22. Sealing ring; 23. Elastic member; 24. Push rod; 25. External valve cover; 25a. Avoidance hole.

[0030] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0033] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] In order to solve the above problems, the present invention proposes a corrosion-resistant sealing valve 1000. Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 as well as Figure 8 This is a schematic structural diagram of an embodiment provided by the present invention.

[0035] Please refer to Figure 1 、 Figure 2 、 Figure 3 as well as Figure 4 The present invention proposes a corrosion-resistant sealing valve 1000, including a valve body 1 and a sealing structure, the valve body 1 is formed with a valve cavity 1a and a mounting hole 1b connected to the valve cavity 1a, and the direction in which the mounting hole 1b extends from one end close to the valve cavity 1a toward the other end of the mounting hole 1b away from the valve cavity 1a is defined as a first direction, and the inner diameter of the mounting hole 1b gradually decreases along the first direction; the sealing structure includes a built-in valve cover 21, a sealing ring 22 and an elastic member 23, the built-in valve cover 21 slides and abuts against the inner wall of the mounting hole 1b, the outer wall of the built-in valve cover 21 gradually shrinks along the first direction, and the outer diameter of the end of the built-in valve cover 21 away from the valve cavity 1a is larger than the inner diameter of the end of the mounting hole 1b away from the valve cavity 1a; the sealing ring 22 is sleeved on the built-in valve cover 21 and abuts against the hole wall of the mounting hole 1b; the elastic member 23 passes through the mounting hole 1b, and the two ends of the elastic member 23 are respectively connected to the valve body 1 and the built-in valve cover 21.

[0036] The tapered inner diameter of mounting hole 1b refers to the tapered structure of the hole wall, which can be achieved through lathing. The constricted outer wall of built-in valve cover 21 refers to its shape matching the taper of mounting hole 1b, which can be achieved through CNC machining of a forged blank. The elastic member 23 can be a stainless steel coil spring or other elastic material.

[0037] In the technical solution of the present invention, the contraction force of the elastic member 23 can continuously pull the built-in valve cover 21 in the first direction, and with the help of the tapered hole wall of the mounting hole 1b that gradually shrinks along the first direction, a radial component force is generated, which continuously presses the sealing ring 22 against the hole wall of the mounting hole 1b, thereby squeezing the sealing ring 22 as a whole between the built-in valve cover 21 and the valve body 1, leaving only an extremely narrow annular gap in contact with the fluid in the valve cavity 1a, reducing the contact area between the effectively sealed part of the sealing ring 22 and the fluid, thereby reducing the rate at which the sealing ring 22 is corroded by the fluid; at the same time, after the part of the sealing ring 22 in contact with the fluid is corroded, the elastic member 23 can be further compressed, automatically compensating for the pulling force on the built-in valve cover 21 in the first direction, so that the sealing ring 22 can maintain its sealing effect; in summary, such a design can extend the service life of the corrosion-resistant sealing valve 1000.

[0038] Please refer to Figure 4 、 Figure 5 、 Figure 6 as well as Figure 7 In one embodiment of the present invention, a latch hole 1b1 is formed on the inner wall of the rear end of the mounting hole 1b along the first direction, and a latch hook 211 is formed on the built-in valve cover 21. The latch hook 211 is configured to be engageable with the latch hole 1b1.

[0039] The latch hole 1b1 is a recessed structure provided on the inner wall of the mounting hole 1b, which can be implemented as an annular groove or a partial groove, and is used to mechanically lock with the latch hook 211. The latch hook 211 is a raised structure provided on the outer wall of the built-in valve cover 21, which can be formed by metal stamping or machining, and is used to physically interfere with the latch hole 1b1 at a specific position.

[0040] When the built-in valve cover 21 moves along the mounting hole 1b toward the valve cavity 1a to open the valve cover, the hook 211 moves with the built-in valve cover 21 to the corresponding position of the hole 1b1, and the hook 211 on the built-in valve cover 21 can be embedded in the hole 1b1. The cooperation between the hook 211 and the hole 1b1 forms a mechanical lock, which can prevent the built-in valve cover 21 from falling off the valve body 1.

[0041] Please refer to Figure 4 、 Figure 5 、 Figure 6 as well as Figure 7 In one embodiment of the present invention, two protrusions 2111 are formed on opposite sides of the hook 211 along the first direction, and a sliding groove 1b2 adapted to the hook 211 is formed on the hole wall of the mounting hole 1b; the sliding groove 1b2 extends along the first direction, and the hook 211 is slidably limited in the sliding groove 1b2.

[0042] The two protrusions 2111 are protrusions on either side of the hook 211, specifically symmetrically arranged bumps, which increase the contact area between the hook 211 and the slide groove 1b2. The slide groove 1b2 is a guide structure provided on the wall of the mounting hole 1b, specifically axially extending strip grooves, which limit the movement of the hook 211.

[0043] Specifically, as the built-in valve cover 21 moves along the mounting hole 1b, the protrusions 2111 on either side of the hook 211 maintain contact with the sidewalls of the chute 1b2. The chute 1b2 extends in the same direction as the movement of the built-in valve cover 21, allowing the hook 211 to slide only axially within the chute 1b2. This structure prevents circumferential shifting of the built-in valve cover 21 during movement, ensuring that the sealing ring 22 maintains uniform contact with the wall of the mounting hole 1b. The interaction between the protrusions 2111 and the chute 1b2 precisely defines the movement trajectory of the built-in valve cover 21, effectively addressing the problem of the built-in valve cover 21 easily shifting during movement.

[0044] Please refer to Figure 4 、 Figure 5 as well as Figure 6 In one embodiment of the present invention, a cross bar 11 is formed at the slot opening of the rear end of the slide slot 1b2 along the first direction, and the cross bar 11 and the slot wall of the slide slot 1b2 are combined to form a locking hole 1b1.

[0045] The crossbar 11 is a transverse protrusion provided at the end notch of the chute 1b2. It can be welded from a metal block or integrally formed with the valve body 1. The crossbar 11 prevents the hook 211 from disengaging from the end of the chute 1b2, thereby limiting the range of movement of the built-in valve cover 21. The locking hole 1b1 is a limited space formed by the crossbar 11 and the sidewalls of the chute 1b2. It can be achieved by adjusting the width of the crossbar 11 to match the depth of the chute 1b2. The locking hole 1b1 is used to accommodate the protrusion 2111 of the hook 211, preventing the built-in valve cover 21 from sliding backward after installation.

[0046] When the internal valve cover 21 moves in the first direction, the protrusion 2111 of the hook 211 slides within the chute 1b2 until it reaches the end of the chute 1b2. At this point, the cross bar 11 blocks further movement of the hook 211, trapping the protrusion 2111 within the retaining hole 1b1. Because the cross bar 11 forms a closed structure with the sidewall of the chute 1b2, the hook 211 cannot reverse out of the retaining hole 1b1. The mechanical stop formed by the cross bar 11 and the chute 1b2 prevents the hook 211 from becoming loose during long-term use.

[0047] Please refer to Figure 1 、 Figure 2 as well as Figure 8 In one embodiment of the present invention, the sealing structure further includes a push rod 24, which passes through the mounting hole 1b and is arranged on a side of the built-in valve cover 21 away from the valve cavity 1a; the push rod 24 is configured to allow the user to move the built-in valve cover 21.

[0048] The push rod 24 is a rigid component that extends through the mounting hole 1b and into the built-in valve cover 21. Specifically, it can be a metal rod or a high-strength plastic rod, with a handle at the end for easy gripping. The push rod 24 is directly connected to the built-in valve cover 21, allowing it to be pushed and opened when needed.

[0049] Please refer to Figure 1 、 Figure 2 as well as Figure 8 In one embodiment of the present invention, the sealing structure further comprises an outer valve cover 25, which is detachably connected to the valve body 1 and configured to cover the opening of the mounting hole 1b at one end away from the valve cavity 1a.

[0050] The outer valve cover 25 is a detachable cover structure that is connected to the valve body 1 via threads or snaps. It can be made of aluminum alloy or stainless steel. Its diameter is larger than the opening at the end of the mounting hole 1b to effectively cover it. This structure physically isolates the opening at the end of the mounting hole 1b, preventing external contaminants from entering the valve cavity 1a.

[0051] The outer valve cover 25 is fixed to the outside of the valve body 1 by screwing or snap-locking, completely covering the open end of the mounting hole 1b away from the valve cavity 1a. When the sealing structure needs to be repaired or replaced, it is only necessary to remove the outer valve cover 25 to expose the internal components of the mounting hole 1b without disassembling the valve body 1 as a whole. The covering effect of the outer valve cover 25 isolates the interior of the mounting hole 1b from the external environment, preventing corrosive media from invading the valve cavity 1a through the end of the mounting hole 1b. The added outer valve cover 25 forms a physical barrier, effectively preventing external contaminants from contacting the sealing structure, achieving active closed protection of the end opening of the mounting hole 1b, and significantly reducing the risk of the sealing ring 22 being corroded by external corrosive media.

[0052] Please refer to Figure 1 、 Figure 2 as well as Figure 8 In one embodiment of the present invention, the outer valve cover 25 is provided with an avoidance hole 25a for the push rod 24 to pass through.

[0053] The avoidance hole 25a is a through hole structure opened on the surface of the outer valve cover 25. A sealing ring can be provided on the hole wall to prevent fluid leakage. The hole is used to accommodate the movement path of the push rod 24 and avoid structural interference between the push rod 24 and the outer valve cover 25.

[0054] By providing a avoidance hole 25a on the outer valve cover 25, the push rod 24 is wrapped inside the outer valve cover 25, which not only retains the operating function of the push rod 24, but also blocks the communication path between the external environment and the valve chamber 1a, effectively reducing the risk of external contaminants invading the mounting hole 1b during the movement of the push rod 24, slowing down the material degradation rate of the sealing ring 22 due to contact with corrosive media, and maintaining the convenience of valve operation and the compactness of the structure.

[0055] It is understood that the push rod 24 can be connected to the hole wall of the avoidance hole 25a by a snap connection or a rotational connection. In one embodiment of the present invention, the push rod 24 is rotatably connected to the hole wall of the avoidance hole 25a and is telescopically connected to the built-in valve cover 21.

[0056] The telescopic connection of the push rod 24 refers to an axial sliding fit structure between the push rod 24 and the built-in valve cover 21, which can be specifically achieved by a sleeve-type slide rail or a guide rod mechanism, so that the push rod 24 can still maintain the axial displacement function during rotation.

[0057] Compared with the traditional linear push-pull structure, the rotary operation mode of the push rod 24 is more convenient for manipulating the push rod 24 in a narrow space, so that the opening size of the avoidance hole 25a can be as small as possible to reduce the risk of external contaminants invading the installation hole 1b.

[0058] Furthermore, in one embodiment of the present invention, the avoidance hole 25a is set to gradually shrink along the first direction; the push rod 24 is rotatably connected to the hole wall of the avoidance hole 25a away from the built-in valve cover 21; the push rod 24 is configured to be able to block the end of the avoidance hole 25a away from the built-in valve cover 21.

[0059] The avoidance hole 25a is gradually contracted along the first direction, which means that the diameter of the avoidance hole 25a gradually decreases from the end close to the built-in valve cover 21 to the direction away from it, which can be achieved by using a tapered hole structure.

[0060] Specifically, when the position of the built-in valve cover 21 needs to be adjusted, the push rod 24 can be rotated about the connection point to an inclined state, allowing the push rod 24 to move axially to drive the built-in valve cover 21. The design of the tapered avoidance hole 25a ensures that the push rod 24 always maintains contact with the hole wall during movement, preventing external contaminants from penetrating into the mounting hole 1b through the gap between the push rod 24 and the hole wall.

[0061] It is understood that the material of the sealing ring 22 can be polytetrafluoroethylene or nitrile rubber. In one embodiment of the present invention, the material of the sealing ring 22 is polytetrafluoroethylene.

[0062] Polytetrafluoroethylene (PTFE) is a highly chemically stable polymer material that can be processed through compression molding or injection molding. The strong polarity of the carbon-fluorine bonds in its molecular structure makes it resistant to corrosion by acids, bases, and organic solvents. In sealing structures, this material forms the interface between the sealing ring 22 and the fluid, reducing the corrosion rate through the material's inherent inertness.

[0063] Specifically, when sealing ring 22 is made of polytetrafluoroethylene (PTFE), when the surface of sealing ring 22 comes into contact with a corrosive medium in the fluid environment within valve chamber 1a, the fluorine atoms in the material form a dense protective layer, preventing the fluid from penetrating the material. Furthermore, the low friction coefficient of PTFE reduces wear during sliding contact between sealing ring 22 and the inner wall of mounting hole 1b, thereby maintaining the integrity of the sealing surface. When the internal valve cover 21 is moved along mounting hole 1b by the elastic member 23, the deformation recovery ability of sealing ring 22 adapts to the changes in the inner diameter of mounting hole 1b, ensuring uniform distribution of sealing pressure.

[0064] Compared to existing technologies, the sealing ring 22 of conventional sealing valves is often made of rubber or ordinary engineering plastics. These are prone to swelling, embrittlement, or chemical bond breakage when exposed to corrosive fluids for a long time, leading to seal failure. Polytetrafluoroethylene, on the other hand, not only offers significantly better corrosion resistance than conventional materials, but its thermal stability also allows it to adapt to temperature fluctuations in the valve cavity 1a, preventing the expansion of the sealing gap caused by differential thermal expansion.

[0065] Through the above technical solution, the present application effectively solves the problem of sealing performance degradation of the sealing ring 22 due to corrosion, extends the service life of the sealing structure under strong corrosion conditions, and reduces the frequency of shutdown maintenance caused by sealing failure.

[0066] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by utilizing the contents of the present invention's description and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A corrosion-resistant sealing valve, characterized in that: include: a valve body, the valve body being formed with a valve cavity and a mounting hole communicating with the valve cavity, wherein a direction extending from an end of the mounting hole close to the valve cavity toward an end of the mounting hole away from the valve cavity is defined as a first direction, and an inner diameter of the mounting hole gradually decreases along the first direction; and A sealing structure comprising a built-in valve cover, a sealing ring, and an elastic member, wherein the built-in valve cover is in sliding contact with the inner wall of the mounting hole, the outer wall of the built-in valve cover gradually shrinks along the first direction, and the outer diameter of the end of the built-in valve cover away from the valve cavity is larger than the inner diameter of the end of the mounting hole away from the valve cavity; the sealing ring is sleeved on the built-in valve cover and in contact with the hole wall of the mounting hole; the elastic member passes through the mounting hole, and the two ends of the elastic member are respectively connected to the valve body and the built-in valve cover; A latch hole is formed on the inner wall of one end of the mounting hole closer to the rear in the first direction, and a latch hook is formed on the built-in valve cover, wherein the latch hook is configured to be latched with the latch hole; The hook is formed with two protrusions on opposite sides along the first direction, and a sliding groove adapted to the hook is formed on the hole wall of the mounting hole; the sliding groove extends along the first direction, and the hook is slidably limited in the sliding groove; A transverse block is formed at the slot opening of one end of the slide slot located rearward along the first direction, and the transverse block and the slot wall of the slide slot are combined to form the latching hole.

2. The corrosion-resistant sealing valve according to claim 1, characterized in that: The sealing structure further includes a push rod, which passes through the mounting hole and is arranged on a side of the built-in valve cover facing away from the valve cavity; the push rod is configured to allow a user to move the built-in valve cover.

3. The corrosion-resistant sealing valve according to claim 2, characterized in that: The sealing structure further comprises an outer valve cover which is detachably connected to the valve body and is configured to cover an opening of the mounting hole at one end away from the valve cavity.

4. The corrosion-resistant sealing valve according to claim 3, characterized in that: The outer valve cover is provided with a position avoidance hole for the push rod to pass through.

5. The corrosion-resistant sealing valve according to claim 4, characterized in that: The push rod is rotatably connected to the hole wall of the avoidance hole and is telescopically connected to the built-in valve cover.

6. The corrosion-resistant sealing valve according to claim 5, characterized in that: The avoidance hole is arranged to gradually shrink along the first direction; The push rod is rotatably connected to the hole wall of the avoidance hole at one end away from the built-in valve cover; the push rod is configured to block the end of the avoidance hole away from the built-in valve cover.

7. The corrosion-resistant sealing valve according to any one of claims 1 to 6, characterized in that: The sealing ring is made of polytetrafluoroethylene.

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