A circular closed valve with high-efficiency anti-corrosion sealing performance and its manufacturing process

Abstract

The present invention discloses a circular closed valve with high-efficiency anti-corrosion sealing performance and its manufacturing process. The lower valve shaft is welded and fixed to the valve body and an anti-corrosion layer is sprayed integrally, which improves the sealing and corrosion resistance of the closed valve; the connection between the upper valve shaft and the valve body relies on the extrusion fit of the bushing, the shaft sleeve, the O-ring and the sealing boss to form a triple seal, which effectively improves the sealing of the closed valve; the double retaining spring design of the upper valve shaft effectively ensures the sealing of the closed valve, and at the same time, this double retaining spring design is simple to process and low in cost, simple to assemble and high in efficiency; a rubber sealing pad is provided on the outside of the blade to effectively ensure the sealing of the closed valve. Therefore, the closed valve of this new structure has high sealing and corrosion resistance. The manufacturing process of the circular closed valve with high-efficiency anti-corrosion sealing performance is simple and efficient, which can effectively ensure the sealing and corrosion resistance of the closed valve.

Description

Technical Field

[0001] The invention relates to the field of sealed valves, and in particular to a circular sealed valve with high-efficiency anti-corrosion sealing performance and a manufacturing process thereof. Background Art

[0002] The closed valve is a common valve in industrial exhaust systems. The current closed valve is mainly composed of a valve body, a valve shaft, a blade threaded on the valve shaft, and a rotating part connected to the valve shaft. Obviously, the existing closed valve has the following defects: First, the connection between the valve shaft and the valve body is sealed by a sleeve and a bushing, and the sealing and corrosion resistance are poor; second, the valve shaft and the valve body are rotatably connected, and the valve shaft is not treated with anti-corrosion spraying, and the valve shaft is easily corroded, affecting the sealing performance and service life of the closed valve; third, the valve shaft is fixedly connected to the valve body through the end cover thread, which is more complicated to process and has a higher cost. Summary of the invention

[0003] The invention discloses a circular closed valve with high-efficiency anti-corrosion and sealing performance and a manufacturing process thereof, solves the existing problems, provides a closed valve with better anti-corrosion and sealing performance and a manufacturing process thereof with simple processing and lower cost.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A circular closed valve with high-efficiency anti-corrosion sealing performance, comprising a circular valve body, wherein a lower valve shaft, a circular sealing blade, a sealing rubber pad, an upper valve shaft, a bracket and an operating mechanism are arranged inside the valve body;

[0006] The sealing rubber pad is evenly arranged on the outside of the blade, and an upper sealing sleeve and a lower sealing sleeve are respectively arranged at both ends of the sealing rubber pad, the upper sealing sleeve surrounds and seals the upper valve shaft, and the lower sealing sleeve surrounds and seals the lower valve shaft, and the sealing rubber pad is in sealing contact with the valve body when closed;

[0007] A bushing and a shaft sleeve are provided at the connection between the upper valve shaft and the valve body, the shaft sleeve is welded and fixed to the valve body, and the bushing is provided between the upper valve shaft and the shaft sleeve;

[0008] The bracket having the function of stabilizing the upper valve shaft is fixedly provided on the outside of the valve body, the upper valve shaft passes through the bracket, the operating mechanism is provided on the top of the bracket, the operating mechanism is fixedly connected to the upper valve shaft, and the upper valve shaft and the blade can be driven to rotate to open and close by operating the operating mechanism;

[0009] The lower valve shaft and the valve body are fixed by welding, the lower valve shaft and the inside of the valve body are integrally sprayed with an anti-corrosion layer, the lower end of the blade does not contact the lower valve shaft, the upper end of the blade is fixedly connected to the upper valve shaft, and a sealing boss is provided on the entire circumference of the upper end of the upper sealing sleeve, and the sealing boss is in extrusion sealing contact with the bushing and the lower part of the sleeve.

[0010] As a further solution of the present invention: the interior of the shaft sleeve and the interior of the valve body are integrally sprayed with an anti-corrosion layer.

[0011] As a further solution of the present invention: two O-rings are provided between the bushing and the shaft sleeve.

[0012] As a further solution of the present invention: the upper valve shaft is fixedly provided with a first retaining spring on the top of the bushing, which can effectively stabilize the bushing.

[0013] As a further solution of the present invention: a second retaining spring is fixedly provided on the inner side of the contact end between the upper valve shaft and the bracket.

[0014] A manufacturing process of a circular closed valve with high-efficiency anti-corrosion sealing performance comprises the following steps:

[0015] S1: The lower valve shaft and the sleeve seal are fixedly welded to the valve body;

[0016] S2: spraying an anti-corrosion layer integrally on the inside of the valve body in a spraying room, including the portion of the lower valve shaft extending into the valve body and the inside of the shaft sleeve, wherein the thickness of the anti-corrosion layer is 300um-400um;

[0017] S3: The blade is passed through a customized mold and the rubber is hot-melted to completely cover the blade to form the sealing pad. The welding temperature of the blade and the sealing pad is 250 degrees and the welding time is 30 minutes. The upper sealing sleeve and the lower sealing sleeve for assembling the upper valve shaft and the lower valve shaft are left at both ends of the sealing pad. The upper end of the upper sealing sleeve is integrally injected with the sealing boss;

[0018] S4: the blade is integrally installed in the valve body, the lower sealing sleeve is arranged on the lower valve shaft, and the upper sealing sleeve abuts against the shaft sleeve through the sealing boss;

[0019] S5: insert the upper valve shaft, bushing and two O-rings through the sleeve, the upper valve shaft is fixedly connected to the upper end of the blade, and the interference between the upper valve shaft and the sealing gasket is 0.2mm;

[0020] S6: The sealing boss is in extrusion sealing contact with the bushing and the lower part of the sleeve, and the compression amount of the sealing boss is 0.5 mm;

[0021] S7: Fixing and installing the first clamping spring and the second clamping spring;

[0022] S8: Fix and install the bracket and the operating mechanism.

[0023] As a further solution of the present invention: the thickness of the anti-corrosion layer is 300um.

[0024] As a further solution of the present invention: the thickness of the anti-corrosion layer is 350um.

[0025] As a further solution of the present invention: the thickness of the anti-corrosion layer is 400um.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The lower valve shaft and the valve body are fixed by welding. After the lower valve shaft and the valve body are welded and sealed, the lower valve shaft and the valve body are sprayed with an anti-corrosion layer. The lower valve shaft does not rotate and the anti-corrosion layer is sprayed integrally with the valve body, which effectively improves the sealing performance and anti-corrosion performance of the closed valve and effectively extends the service life of the closed valve.

[0028] 2. A bushing and a shaft sleeve are provided at the connection between the upper valve shaft and the valve body. The shaft sleeve is fixedly connected to the valve body. A bushing is provided between the upper valve shaft and the shaft sleeve. Two O-rings are provided between the bushing and the shaft sleeve. A sealing boss is provided all around the upper end of the sealing rubber pad. The sealing boss is squeezed and sealed with the bushing and the shaft sleeve. A triple sealing structure is formed at the connection between the upper valve shaft and the valve body. The bushing and the sealing boss are squeezed to form a single seal. The O-ring is squeezed between the bushing and the shaft sleeve to form a double seal. The shaft sleeve and the sealing boss are squeezed to form a triple seal. This triple seal ensures that the gas inside the pipeline can neither penetrate into the interior to corrode the valve shaft nor leak to the outside to corrode the pipeline surface, thereby improving the sealing and anti-corrosion performance of the closed valve.

[0029] 3. The upper valve shaft is fixed with a first retaining spring on the top of the bushing to effectively stabilize the bushing, and a second retaining spring is fixed on the inner side of the contact end between the upper valve shaft and the bracket. The upper valve shaft is fixed with two retaining springs. The first retaining spring can effectively stabilize the bushing, and the first retaining spring can control the extrusion amount between the bushing and the sealing boss, thereby ensuring the reliability of the seal between the bushing and the blade; the second retaining spring can limit and fix the upper valve shaft by cooperating with the bracket, which can adjust the position of the blade and ensure the stability of the upper valve shaft. The double retaining spring design of the upper valve shaft effectively ensures the sealing of the closed valve. At the same time, compared with the existing valve shaft fixing process, this double retaining spring design is simple to process and low in cost, simple to assemble and high in efficiency.

[0030] 4. Sealing pads are evenly arranged on the outside of the blades, which surround and seal the upper valve shaft and the lower valve shaft. The sealing pads are in sealing contact with the valve body when closed. The blades are made of stainless steel valve plates with rubber as a whole, which not only ensures the strength of the blades, but also ensures the sealing performance with the valve body through the softness of the rubber.

[0031] This circular closed valve with high-efficiency anti-corrosion sealing performance has the lower valve shaft and valve body welded and fixed and sprayed with an anti-corrosion layer, which improves the sealing and corrosion resistance of the closed valve; the upper valve shaft and valve body are connected by the extrusion fit of the bushing, sleeve, O-ring and sealing boss to form a triple seal, which effectively improves the sealing of the closed valve; the double retaining spring design of the upper valve shaft effectively ensures the sealing of the closed valve, and this double retaining spring design is simple to process and low in cost, simple to assemble and high in efficiency; the rubber sealing pad is provided on the outside of the blade to effectively ensure the sealing of the closed valve. Therefore, this new structure of the closed valve has high sealing and corrosion resistance.

[0032] The manufacturing process of the circular closed valve with high-efficiency anti-corrosion sealing performance is simple and efficient, which can effectively ensure the sealing and anti-corrosion properties of the closed valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0034] In the attached picture:

[0035] Figure 1 This is a cross-sectional view of a circular closed valve with high-efficiency anti-corrosion sealing performance according to the present invention;

[0036] Figure 2 This is a partial enlarged view of the A part of a circular closed valve with high-efficiency anti-corrosion sealing performance of the present invention;

[0037] Figure 3 It is a front view of a circular sealed valve sealing rubber pad with high-efficiency anti-corrosion sealing performance according to the present invention;

[0038] Figure 4 It is a side view of a circular closed valve sealing rubber gasket with high-efficiency anti-corrosion sealing performance according to the present invention;

[0039] Figure 5 This is a schematic diagram of the three-dimensional structure of a circular closed valve with high-efficiency anti-corrosion sealing performance according to the present invention;

[0040] Reference numerals:

[0041] 1. Valve body; 21. Lower valve shaft; 22. Upper valve shaft; 3. Blade; 4. Sealing pad; 41. Lower sealing sleeve; 42. Upper sealing sleeve; 43. Sealing boss; 5. Bushing; 6. Bushing; 7. O-ring; 81. First retaining spring; 82. Second retaining spring; 9. Bracket; 10. Operating mechanism; DETAILED DESCRIPTION

[0042] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present embodiment disclosure as detailed in the appended claims.

[0043] It should be noted that all directional indications in the embodiments (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0044] In addition, in the embodiments, the descriptions involving "first", "second", etc. are only for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0045] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0046] like Figure 1-5 As shown:

[0047] A circular closed valve with high-efficiency anti-corrosion sealing performance comprises a circular valve body 1, wherein a lower valve shaft 21, a circular sealing blade 3, a sealing rubber pad 4, an upper valve shaft 22, a bracket 9 and an operating mechanism 10 are arranged inside the valve body 1.

[0048] Sealing rubber pads 4 are evenly arranged on the outside of the blades 3, and an upper sealing sleeve 42 and a lower sealing sleeve 41 are respectively arranged at both ends of the sealing rubber pad 4. The upper sealing sleeve 42 surrounds and seals the upper valve shaft 22, and the lower sealing sleeve 41 surrounds and seals the lower valve shaft 21. The sealing rubber pad 4 is in sealing contact with the valve body 1 when closed. The blade 3 adopts the method of overall rubber coating of the stainless steel valve plate, which not only ensures the strength of the blade 3, but also ensures the sealing performance of the blade 3 with the valve body 1 through the softness of the rubber.

[0049] A bushing 6 and a shaft sleeve 5 are provided at the connection between the upper valve shaft 22 and the valve body 1. The shaft sleeve 5 and the valve body 1 are welded and fixedly connected. The inside of the shaft sleeve 5 and the inside of the valve body 1 are integrally sprayed with an anti-corrosion layer. A bushing 6 is provided between the upper valve shaft 22 and the shaft sleeve 5. Two O-rings 7 are provided between the bushing 6 and the shaft sleeve 5.

[0050] A bracket 9 having the function of stabilizing the upper valve shaft 22 is fixedly provided on the outside of the valve body 1. The upper valve shaft 22 passes through the bracket 9. An operating mechanism 10 is provided on the top of the bracket 9. The operating mechanism 10 is fixedly connected to the upper valve shaft 22. The upper valve shaft 22 and the blade 3 can be rotated to open and close by operating the operating mechanism 10. A first retaining spring 81 that can effectively stabilize the bushing 6 is fixedly provided on the top of the bushing 6 of the upper valve shaft 22, and a second retaining spring 82 is fixedly provided on the inner side of the contact end between the upper valve shaft 22 and the bracket 9.

[0051] The lower valve shaft 21 and the valve body 1 are fixed by welding, and the lower valve shaft 21 and the interior of the valve body 1 are integrally sprayed with an anti-corrosion layer. The lower end of the blade 3 does not contact the lower valve shaft 21, and the upper end of the blade 3 is fixedly connected to the upper valve shaft 22. A sealing boss 43 is provided around the upper end of the upper sealing sleeve 42, and the sealing boss 43 is in extrusion sealing contact with the bushing 6 and the lower part of the sleeve 5.

[0052] The manufacturing process of a circular closed valve with high-efficiency anti-corrosion sealing performance includes the following steps:

[0053] S1: The lower valve shaft 21 and the shaft sleeve 5 are sealed and fixedly welded to the valve body 1;

[0054] S2: In a spraying room, an anti-corrosion layer is sprayed integrally on the inside of the valve body 1, including the portion of the lower valve shaft 21 extending into the valve body 1 and the inside of the shaft sleeve 5, and the thickness of the anti-corrosion layer is 300um-400um;

[0055] S3: The blade 3 is passed through a customized mold and is completely covered with rubber hot melt to form a sealing rubber pad 4. The welding temperature of the blade 3 and the sealing rubber pad 4 is 250 degrees and the welding time is 30 minutes. An upper sealing sleeve 42 and a lower sealing sleeve 41 for assembling the upper valve shaft 22 and the lower valve shaft 21 are left at both ends of the sealing rubber pad 4. A sealing boss 43 is integrally injected on the upper end of the upper sealing sleeve 42;

[0056] S4: The blade 3 is integrally installed in the valve body 1, the lower sealing sleeve 41 is arranged on the lower valve shaft 21, and the upper sealing sleeve 42 abuts against the shaft sleeve 5 through the sealing boss 43;

[0057] S5: insert the upper valve shaft 22, bushing 6 and two O-rings 7 through the shaft sleeve 5, the upper valve shaft 22 is fixedly connected to the upper end of the blade 3, and the interference between the upper valve shaft 22 and the sealing gasket 4 is 0.2mm;

[0058] S6: The sealing boss 43 is squeezed and sealed against the bushing 6 and the lower part of the sleeve 5, and the compression amount of the sealing boss 43 is 0.5 mm;

[0059] S7: Fix and install the first clamping spring 81 and the second clamping spring 82;

[0060] S8: Fix the mounting bracket 9 and the operating mechanism 10.

[0061] Among them, the preferred anti-corrosion layer thickness is 300um.

[0062] Among them, the preferred anti-corrosion layer thickness is 350um.

[0063] Among them, the preferred anti-corrosion layer thickness is 400um.

[0064] In actual applications, the lower valve shaft 21 and the valve body 1 are welded and fixed. After the lower valve shaft 21 and the valve body 1 are welded and sealed, the lower valve shaft 21 and the valve body 1 are integrally sprayed with an anti-corrosion layer. The lower valve shaft 21 does not rotate and the anti-corrosion layer is integrally sprayed with the valve body 1, which effectively improves the sealing performance and anti-corrosion performance of the closed valve and effectively extends the service life of the closed valve.

[0065] A bushing 6 and a shaft sleeve 5 are provided at the connection between the upper valve shaft 22 and the valve body 1. The shaft sleeve 5 is fixedly connected to the valve body 1. A bushing 6 is provided between the upper valve shaft 22 and the shaft sleeve 5. Two O-rings 7 are provided between the bushing 6 and the shaft sleeve 5. A sealing boss 43 is provided on the entire circumference of the upper end of the sealing gasket 4. The sealing boss 43 is squeezed and sealed with the bushing 6 and the shaft sleeve 5. A triple sealing structure is formed at the connection between the upper valve shaft 22 and the valve body 1. The bushing 6 and the sealing boss 43 are squeezed to form a single seal. The O-ring 7 is squeezed between the bushing 6 and the shaft sleeve 5 to form a double seal. The shaft sleeve 5 and the sealing boss 43 are squeezed to form a triple seal. This triple seal ensures that the gas inside the pipeline can neither penetrate into the interior to corrode the valve shaft nor leak to the outside to corrode the pipeline surface, thereby improving the sealing and anti-corrosion performance of the closed valve.

[0066] The upper valve shaft 22 is fixed with a first retaining spring 81 on the top of the bushing 6, which can effectively stabilize the bushing 6. The upper valve shaft 22 is fixed with a second retaining spring 82 on the inner side of the contact end between the upper valve shaft 22 and the bracket 9. The upper valve shaft 22 is fixed with two retaining springs. The first retaining spring 81 can effectively stabilize the bushing 6. At the same time, the extrusion amount between the bushing 6 and the sealing boss 43 can be controlled by the first retaining spring 81, thereby ensuring the reliability of the seal between the bushing 6 and the blade 3; the second retaining spring 82 can limit and fix the upper valve shaft 22 by cooperating with the bracket 9, which can adjust the position of the blade 3 and ensure the stability of the upper valve shaft 22. The double retaining spring design of the upper valve shaft 22 effectively ensures the sealing of the closed valve. At the same time, compared with the existing valve shaft fixing process, this double retaining spring design is simple to process and low in cost, simple to assemble and high in efficiency.

[0067] Sealing rubber pads 4 are evenly arranged on the outside of the blades 3, and the sealing rubber pads 4 surround and seal the upper valve shaft 22 and the lower valve shaft 21. The sealing rubber pads 4 are in sealing contact with the valve body 1 when closed. The blades 3 are made of stainless steel valve plates with rubber as the whole, which not only ensures the strength of the blades 3, but also ensures the sealing performance with the valve body 1 through the softness of the rubber.

[0068] This circular closed valve with high-efficiency anti-corrosion sealing performance has a lower valve shaft 21 welded to the valve body 1 and an anti-corrosion layer sprayed on it as an integral unit, which improves the sealing and corrosion resistance of the closed valve; the connection between the upper valve shaft 22 and the valve body 1 forms a triple seal by means of the extrusion fit of the bushing 6, the shaft sleeve 5, the O-ring 7 and the sealing boss 43, which effectively improves the sealing of the closed valve; the double retaining spring design of the upper valve shaft 22 effectively ensures the sealing of the closed valve, and at the same time, this double retaining spring design is simple to process and has low cost, simple assembly and high efficiency; a rubber sealing pad 4 is provided on the outside of the blade 3 to effectively ensure the sealing of the closed valve.

[0069] Therefore, the closed valve with this new structure has higher sealing and corrosion resistance.

[0070] The part of the lower valve shaft 21 extending into the valve body 1, the inside of the sleeve 5 and the inside of the valve body 1 are integrally sprayed with an anti-corrosion layer, the thickness of the anti-corrosion layer is 300um-400um, and the preferred thickness of the anti-corrosion layer is 300um, 350um and 400um, which can effectively improve the anti-corrosion performance of the closed valve.

[0071] The blade 3 is made into a customized mold and the rubber is hot-melted to completely cover the blade 3 to form a sealing pad 4. The welding temperature of the blade 3 and the sealing pad 4 is 250 degrees and the welding time is 30 minutes. A better connection effect can be achieved by using a specific temperature and time. The effective hot-melt connection between the blade 3 and the sealing pad 4 can effectively improve the sealing of the closed valve.

[0072] The interference between the upper valve shaft 22 and the sealing rubber gasket 4 is 0.2 mm, and the tight fit between the sealing rubber gasket 4 and the upper valve shaft can effectively improve the sealing performance.

[0073] The sealing boss 43 is squeezed and sealed against the bushing 6 and the lower part of the sleeve 5. The compression amount of the sealing boss 43 is 0.5 mm. The squeezing and abutting of the sealing boss 43 can effectively improve the sealing and corrosion resistance of the closed valve.

[0074] The manufacturing process of the circular closed valve with high-efficiency anti-corrosion sealing performance is simple and efficient, which can effectively ensure the sealing and anti-corrosion properties of the closed valve.

[0075] Finally, it should be noted that the above disclosure is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The scope of this application is limited only by the attached claims.

Claims

1. A circular sealed valve with high-efficiency anti-corrosion sealing performance, comprising a circular valve body (1), wherein the valve body (1) is provided with a lower valve shaft (21), a circular sealing blade (3), a sealing rubber pad (4), an upper valve shaft (22), a bracket (9) and an operating mechanism (10); The sealing rubber pad (4) is evenly arranged on the outside of the blade (3), and an upper sealing sleeve (42) and a lower sealing sleeve (41) are respectively arranged at both ends of the sealing rubber pad (4), the upper sealing sleeve (42) surrounds and seals the upper valve shaft (22), and the lower sealing sleeve (41) surrounds and seals the lower valve shaft (21), and the sealing rubber pad (4) is in sealing contact with the valve body (1) when closed; A bushing (6) and a shaft sleeve (5) are provided at the connection between the upper valve shaft (22) and the valve body (1); the shaft sleeve (5) and the valve body (1) are fixed by welding; and the bushing (6) is provided between the upper valve shaft (22) and the shaft sleeve (5); The valve body (1) is externally fixedly provided with a bracket (9) for stabilizing the upper valve shaft (22); the upper valve shaft (22) passes through the bracket (9); the top of the bracket (9) is provided with an operating mechanism (10); the operating mechanism (10) is fixedly connected to the upper valve shaft (22); operating the operating mechanism (10) can drive the upper valve shaft (22) and the blade (3) to rotate to realize opening and closing; Features: The lower valve shaft (21) and the valve body (1) are fixed by welding, the lower valve shaft (21) and the interior of the valve body (1) are integrally sprayed with an anti-corrosion layer, the lower end of the blade (3) does not contact the lower valve shaft (21), the upper end of the blade (3) is fixedly connected to the upper valve shaft (22), the upper end of the upper sealing sleeve (42) is provided with a sealing boss (43) around the entire circumference, and the sealing boss (43) is in extrusion sealing contact with the bushing (6) and the lower part of the shaft sleeve (5); The interior of the shaft sleeve (5) and the interior of the valve body (1) are integrally sprayed with an anti-corrosion layer; Two O-rings (7) are provided between the bushing (6) and the shaft sleeve (5); The upper valve shaft (22) is fixedly provided with a first retaining spring (81) on the top of the bushing (6) and can effectively stabilize the bushing (6); A second retaining spring (82) is fixedly provided on the inner side of the contact end between the upper valve shaft (22) and the bracket (9); The manufacturing process of a circular closed valve with high-efficiency anti-corrosion sealing performance includes the following steps: S1: Sealing and fixing the lower valve shaft (21) and the shaft sleeve (5) to the valve body (1); S2: spraying an anti-corrosion layer integrally on the interior of the valve body (1) in a spraying room, including the portion of the lower valve shaft (21) extending into the valve body (1) and the interior of the shaft sleeve (5), wherein the thickness of the anti-corrosion layer is 300um-400um; S3: The blade (3) is made into a customized mold and the blade (3) is completely covered by rubber hot melt to form the sealing rubber pad (4). The welding temperature of the blade (3) and the sealing rubber pad (4) is 250 degrees and the welding time is 30 minutes. The upper sealing sleeve (42) and the lower sealing sleeve (41) for assembling the upper valve shaft (22) and the lower valve shaft (21) are left at both ends of the sealing rubber pad (4). The upper end of the upper sealing sleeve (42) is integrally injected with the sealing boss (43); S4: the blade (3) is integrally installed in the valve body (1), the lower sealing sleeve (41) is arranged on the lower valve shaft (21), and the upper sealing sleeve (42) abuts against the shaft sleeve (5) via the sealing boss (43); S5: The upper valve shaft (22), the bushing (6) and the two O-rings (7) are inserted through the shaft sleeve (5), the upper valve shaft (22) is fixedly connected to the upper end of the blade (3), and the interference fit between the upper valve shaft (22) and the sealing rubber pad (4) is 0.2 mm; S6: The sealing boss (43) is in extrusion sealing contact with the bushing (6) and the lower part of the shaft sleeve (5), and the compression amount of the sealing boss (43) is 0.5 mm; S7: Fixing and installing the first clamping spring (81) and the second clamping spring (82); S8: Fixing and installing the bracket (9) and the operating mechanism (10).

2. A circular sealed valve with high-efficiency anti-corrosion sealing performance according to claim 1, characterized in that: The thickness of the anti-corrosion layer is 300um.

3. A circular sealed valve with high-efficiency anti-corrosion sealing performance according to claim 1, characterized in that: The thickness of the anti-corrosion layer is 350um.

4. A circular sealed valve with high-efficiency anti-corrosion sealing performance according to claim 1, characterized in that: The thickness of the anti-corrosion layer is 400um.

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