PPS anti-corrosion ball valve

Abstract

The utility model discloses a PPS anti-corrosion ball valve, and relates to the technical field of anti-corrosion ball valves, the PPS anti-corrosion ball valve comprises a valve body, a valve cover and a valve ball, the valve body, the valve cover and the valve ball respectively form a liquid flow channel, the valve cover and the valve body are buckled to form a containing space, the valve ball is located in the containing space and abuts against the valve body and the valve cover, and the valve cover is connected with the valve body. PPS anti-corrosion coatings are formed on the side walls, exposed out of the liquid flow channel, of the valve ball, the valve body and the valve cover correspondingly. Compared with an existing fluorine lining ball valve, the PPS anti-corrosion coatings are arranged on the valve ball, the valve body and the valve cover, so that the valve ball, the valve body and the valve cover have high corrosion resistance, temperature resistance, abrasion resistance and creep resistance, the ball valve can be used for conveying pipelines of media such as hydrochloric acid, acetic acid and saline water, the long-term use temperature can reach 180 DEG C, and the service life of the ball valve is prolonged. The PPS anti-corrosion ball valve is high in corrosion resistance, high in temperature resistance, high in creep resistance and not prone to leakage.

Description

Technical Field

[0001] The utility model relates to the technical field of anti-corrosion ball valves, in particular to a PPS anti-corrosion ball valve. Background Art

[0002] At present, most anti-corrosion ball valves adopt fluorine-lined ball valves. Fluorine-lined ball valves, also known as fluoroplastic-lined corrosion-resistant ball valves, are made by placing polytetrafluoroethylene resin (or processed profiles) on the inner wall of the pressure-bearing parts of steel or iron valves or the outer surface of valve internals by means of molding (or inlaying). Various valves are made using the unique properties of polytetrafluoroethylene resin in resisting strongly corrosive media. With the development of industry, fluorine-lined valves and fluorine-lined pipe fittings have been widely used in industries such as petroleum, chemical industry, printing and dyeing, and medicine. The anti-corrosion performance of fluorine-lined ball valves is the best, and they can be applied to sulfuric acid, nitric acid, hydrochloric acid of various concentrations and various organic solvents.

[0003] Ball valves with steel-lined fluoroplastics generally adopt granular material molding and heating to form, with a relatively thick lining layer and insufficient hardness of the lining layer. Fluorine-lined ball valves are greatly restricted by temperature and pressure. In a negative pressure and high-temperature working condition environment, the fluoroplastic lining layer is prone to softening and is prone to creep under the action of external forces, causing delamination and collapse of the lining layer, resulting in blockage, inability to close the ball valve or seal leakage. Without appropriate anti-corrosion means, users can only ensure the normal operation of production by inspecting and frequently repairing or replacing fluorine-lined valves regularly. The inevitable shutdown indirectly causes economic damage. Summary of the Utility Model

[0004] The utility model aims at the above problems, and at least overcomes one of them, and provides a PPS anti-corrosion ball valve.

[0005] The technical solution adopted by the utility model is as follows:

[0006] The present application provides a PPS anti-corrosion ball valve, including a valve body, a valve cover and a valve ball. The valve body, the valve cover and the valve ball are respectively formed with liquid flow channels. The valve cover is buckled with the valve body to form an accommodation space. The valve ball is located in the accommodation space and abuts against the valve body and the valve cover. PPS anti-corrosion coatings are respectively formed on the side walls of the valve ball, the valve body and the valve cover exposed in the liquid flow channels.

[0007] The chemical name of PPS is polyphenylene sulfide, commonly known as "steel material", which is a high-temperature resistant thermoplastic engineering plastic and makes a metallic sound when struck. Its characteristics are: high strength; high rigidity; very good chemical resistance, insoluble in any known organic solvents below 200°C; creep resistance; flame retardant (no need to add flame retardant); high temperature resistance, the long-term use temperature can reach 200°C, and the heat distortion temperature of glass fiber reinforced is 260 degrees; excellent dimensional stability, and the expansion coefficient is close to that of metal.

[0008] Existing fluorine-lined ball valves are greatly restricted by temperature and pressure. Generally, the applicable range given by manufacturers is between -29°C and 150°C. However, in actual applications, the applicable temperature generally does not exceed 100°C, which cannot meet the requirements of some high-temperature usage scenarios. Compared with existing fluorine-lined ball valves, in this application, by setting a PPS anti-corrosion coating on the valve ball, valve body, and valve cover, the valve ball, valve body, and valve cover can have high corrosion resistance, heat resistance, wear resistance, and creep resistance, enabling the ball valve to be used in the pipeline for transporting media such as hydrochloric acid, acetic acid, and brine. The long-term service temperature can reach 180°C, that is, the PPS anti-corrosion ball valve provided in this application has high corrosion resistance, strong heat resistance, strong anti-creep performance, and is not prone to leakage.

[0009] Further, the valve ball, valve body, and valve cover also respectively form the PPS anti-corrosion coating on the side walls exposed in the accommodation space.

[0010] In the actual structure, the accommodation space overlaps with the liquid flow channels of the valve body and valve cover, and the liquid flow channels of the valve body and valve cover are coaxially arranged.

[0011] Further, the PPS anti-corrosion coating is formed by electrostatic spraying and sintered at high temperature. When spraying PPS powder, no electrostatic shielding will occur, which can ensure the spraying quality after sintering.

[0012] By using the electrostatic spraying and high-temperature sintering method to make the PPS anti-corrosion coating, the thickness of the coating can be effectively controlled and the uniformity of the coating can be ensured, so that it can accurately reach the required assembly size. In actual use, the materials of the valve ball, valve body, and valve cover are metals, and the PPS anti-corrosion coating can have a strong bonding force with the valve ball, valve body, and valve cover made of metal materials.

[0013] Existing fluorine-lined ball valves are made by the molding method, which requires special presses and personnel with certain operating experience for manufacturing. The daily output is not high, so the price of fluorine-lined ball valves is relatively high. The PPS anti-corrosion coating provided in this application uses electrostatic spraying and high-temperature sintering for forming, and the manufacturing process requirements are lower than those of fluorine-lined ball valves, which is also convenient for cost reduction.

[0014] Further, the materials of the valve ball, valve body, valve stem, valve nozzle, and valve cover are preferably steel.

[0015] Further, the PPS anti-corrosion coating has a uniform thickness and smoothly transitions on the side walls of the valve ball, valve body, and valve cover;

[0016] The thickness range of the PPS anti-corrosion coating is 0.3 mm to 0.5 mm, preferably 0.4 mm.

[0017] That is, during the actual production operation process, the technical requirements are as follows: there shall be no sharp corners at the spraying positions of the components. For those with corners at the spraying positions, an arc transition structure shall be adopted at the corners, and the minimum transition radius is 0.5 mm. The coating thickness shall be appropriate to make the structures of the valve body and valve cover close to the dimensions of a common ball valve. Excessive coating thickness is not conducive to cost reduction. The coating is wear-resistant, and its coefficient of thermal expansion is equivalent to that of steel, which can effectively prevent creep and coating delamination problems.

[0018] Furthermore, it further includes a first seal. The first seal has a first contact portion and a second contact portion. The first contact portion is used to contact the valve ball, and the second contact portion is used to contact the valve body or the valve cover, so that the valve ball abuts against the valve body and the valve cover through the first seal.

[0019] During actual use, PPS anti-corrosion coatings are respectively formed on the side walls of the valve ball, valve body, and valve cover that are in contact with the first seal.

[0020] Furthermore, the first contact portion is an arc-shaped structural surface adapted to the outer side wall of the valve ball.

[0021] Furthermore, convex ring platforms adapted to the first seal are respectively provided on the valve body and the valve cover;

[0022] The second contact portion is a concave ring groove adapted to the convex ring platform, and the corners of the concave ring groove are in an arc transition structure.

[0023] Furthermore, the concave ring groove is provided on one side close to the inner circle of the first seal. The corners of the concave ring groove are in an arc with a radius of 0.3 mm to 0.6 mm, preferably 0.5 mm.

[0024] Furthermore, the width of the concave ring groove is between 1 mm and 3 mm, preferably 2 mm; the depth of the concave ring groove is between 1 mm and 3 mm, preferably 2 mm.

[0025] On the one hand, the first seal is provided with a concave ring groove and is matched with the convex ring platforms on the valve body and the valve cover, which is convenient for limiting the first seal, that is, effectively assembling the first seal on the valve body and the valve cover to prevent the valve ball from rotating and the sealing ring from running out of the seal seat during the process of opening and closing the valve; on the other hand, the arc transition of the concave ring groove can improve the elasticity of the first seal, reduce the torque during the opening and closing process of the valve, reduce the friction between the first seal and the valve ball, and improve the service life of the first seal.

[0026] Furthermore, it further includes a second seal, and the second seal is arranged between the mutually buckled valve body and valve cover;

[0027] PPS anti-corrosion coatings are respectively formed on the side walls of the valve body and the valve cover that are mutually buckled.

[0028] In actual use, the PPS anti-corrosion coatings are respectively formed on the side walls of the valve body and the valve cover that are respectively in contact with the second seal.

[0029] Furthermore, it further includes a valve nozzle, a third seal, and a fourth seal. A valve rod is fixedly connected to the valve ball. An installation opening is provided on the valve body. The valve rod passes through the installation opening of the valve body through the valve nozzle.

[0030] The third seal is arranged between the valve body and the valve nozzle.

[0031] The fourth seal is arranged between the valve rod and the valve nozzle.

[0032] The side wall of the valve nozzle exposed in the accommodation space is formed with the PPS anti-corrosion coating.

[0033] The side walls of the valve nozzle that are respectively in contact with the installation opening of the valve body and the valve rod are respectively formed with the PPS anti-corrosion coating.

[0034] The side walls of the valve rod exposed in the accommodation space and the side walls in contact with the valve nozzle are respectively formed with the PPS anti-corrosion coating.

[0035] Furthermore, the valve ball and the valve rod are integrally formed.

[0036] Furthermore, an electrostatic grounding point is formed on the valve rod.

[0037] The valve ball and the valve rod are of an integral structure, and an electrostatic grounding point is provided on the valve rod, so that the anti-corrosion part can be spray-coated at one time, and full anti-corrosion can be achieved without additional structure, which is convenient for spray-coating operation and reduces production costs.

[0038] Furthermore, a handle is connected to the valve rod. The handle is used to drive the valve ball to rotate to realize the opening and closing of the valve. When the valve ball is rotated so that the liquid flow channel of the valve ball is communicated with the liquid flow channel of the valve body or the valve cover, the valve is in an open state.

[0039] In actual use, the PPS anti-corrosion coatings are respectively formed on the side walls of the valve body and the valve nozzle that are in contact with the third seal.

[0040] Furthermore, the first seal, the second seal, the third seal, and the fourth seal are all made of high-temperature resistant anti-corrosion materials.

[0041] The PPS anti-corrosion coatings are respectively formed on the side walls of the valve nozzle and the valve rod that are respectively in contact with the fourth seal.

[0042] Furthermore, the PPS anti-corrosion coating is formed on the contact surface where the valve body is fastened to the valve cover, each end face of the valve body, each end face of the valve cover, the contact surface where the valve body contacts the valve nozzle, and the contact surface where the valve nozzle contacts the valve stem.

[0043] Furthermore, a communication hole is provided on the valve ball, and the communication hole is used to communicate the accommodation space with the liquid flow channel of the valve ball.

[0044] In actual use, the ball valve needs to be in an open state during storage and shipment. When the external temperature changes, a pressure difference will be formed between the accommodation space outside the valve ball and the liquid flow channel of the valve ball, resulting in an airtight phenomenon, which makes it difficult to open the valve or causes damage to the first seal. The setting of the communication hole makes the pressure difference between the accommodation space outside the valve ball and the liquid flow channel of the valve ball always zero, that is, no pressure difference will be formed or airtight will occur.

[0045] The beneficial effects of the present utility model are as follows:

[0046] (1) In this application, by setting the PPS anti-corrosion coating on the valve ball, valve body and valve cover, and using electrostatic spraying and high-temperature sintering methods to make the PPS anti-corrosion coating, the thickness of the coating can be effectively controlled and the uniformity of the coating can be ensured, so that it can accurately reach the required assembly dimensions. It can also make the valve ball, valve body and valve cover have high corrosion resistance, temperature resistance, wear resistance and creep resistance, so that the ball valve can be used in the pipeline for transporting media such as hydrochloric acid, acetic acid, and brine, and the long-term use temperature can reach 180 °C. That is, the PPS anti-corrosion ball valve provided by this application has high corrosion resistance, strong temperature resistance, strong anti-creep performance and is not easy to leak.

[0047] (2) The first seal is provided with a concave ring groove and is matched with the convex ring platform on the valve body and valve cover, which is convenient for limiting the first seal, that is, the first seal is effectively assembled on the valve body and valve cover, preventing the valve ball from rotating and the sealing ring from running out of the seal seat during the process of opening and closing the valve; the concave ring groove has an arc transition, which can improve the elasticity of the first seal, reduce the torque during the opening and closing process of the valve, reduce the friction between the first seal and the valve ball, and improve the service life of the first seal.

[0048] (3) The setting of the communication hole makes the pressure difference between the accommodation space outside the valve ball and the liquid flow channel of the valve ball always zero, that is, no pressure difference will be formed or airtight will occur. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 is a schematic cross-sectional structure view of the PPS anti-corrosion ball valve in the main view direction of the embodiment of the present utility model;

[0050] Figure 2 is Figure 1 the partial enlarged structure view of A in

[0051] The reference numerals in the figures are as follows:

[0052] 1. Liquid flow channel; 2. Accommodating space; 10. Valve body; 20. Valve cover; 30. Valve ball; 301. Communication hole; 40. PPS anti-corrosion coating; 51. First seal; 511. First contact part; 512. Second contact part; 513. Convex ring platform; 514. Concave ring groove; 52. Second seal; 53. Third seal; 54. Fourth seal; 60. Valve nozzle; 70. Valve stem; 701. Grounding point; 80. Handle. Detailed implementation mode

[0053] The following will describe the present utility model in detail with reference to the accompanying drawings.

[0054] As Figure 1 and Figure 2 shown in the figure, the present application provides a PPS anti-corrosion ball valve, including a valve body 10, a valve cover 20 and a valve ball 30. The valve body 10, the valve cover 20 and the valve ball 30 are respectively formed with a liquid flow channel 1. The valve cover 20 is buckled with the valve body 10 to form an accommodating space 2. The valve ball 30 is located in the accommodating space 2 and abuts against the valve body 10 and the valve cover 20. PPS anti-corrosion coatings 40 are respectively formed on the side walls of the valve ball 30, the valve body 10 and the valve cover 20 exposed in the liquid flow channel 1.

[0055] The chemical name of PPS is polyphenylene sulfide, commonly known as "steel material", which is a high-temperature thermoplastic engineering plastic with a metallic sound when tapped. Its characteristics are: high strength; high rigidity; very good chemical resistance, insoluble in any known organic solvent below 200 °C; creep resistance; flame retardant (no need to add flame retardant); high temperature resistance, the long-term use temperature can reach 200 °C, and the heat distortion temperature of glass fiber reinforced is 260 °C; excellent dimensional stability, and the expansion coefficient is close to that of metal.

[0056] Compared with the existing fluorine-lined ball valve, by providing PPS anti-corrosion coatings 40 on the valve ball 30, the valve body 10 and the valve cover 20, the valve ball 30, the valve body 10 and the valve cover 20 can have high corrosion resistance, temperature resistance, wear resistance and creep resistance, so that the ball valve can be used in the pipeline for transporting media such as hydrochloric acid, acetic acid and brine, and the long-term use temperature can reach 180 °C, that is, the PPS anti-corrosion ball valve provided by the present application has high corrosion resistance, strong temperature resistance, strong anti-creep performance and is not easy to leak.

[0057] In this embodiment, PPS anti-corrosion coatings 40 are also respectively formed on the side walls of the valve ball 30, the valve body 10 and the valve cover 20 exposed in the accommodating space 2.

[0058] In the actual structure, there is an overlap between the accommodating space 2 and the liquid flow channels 1 of the valve body 10 and the valve cover 20, and the liquid flow channels 1 of the valve body 10 and the valve cover 20 are coaxially arranged.

[0059] In this embodiment, after the valve cover 20 is buckled with the valve body 10, they are detachably and fixedly connected by fasteners.

[0060] In this embodiment, the PPS anti-corrosion coating 40 is formed by electrostatic spraying and then shaped by high-temperature sintering. When spraying the PPS powder, no electrostatic shielding will occur, which can ensure the spraying quality after sintering.

[0061] By using the electrostatic spraying and high-temperature sintering method to make the PPS anti-corrosion coating 40, the thickness of the coating can be effectively controlled and the uniformity of the coating can be ensured, so that it can accurately reach the required assembly dimensions. In actual use, the materials of the valve ball 30, the valve body 10 and the valve cover 20 are metals, and the PPS anti-corrosion coating 40 can have a strong bonding force with the valve ball 30, the valve body 10 and the valve cover 20 made of metal materials.

[0062] The existing fluorine-lined ball valves are made by the molding method, which requires special presses and personnel with certain operating experience for manufacturing, and the daily output is not high, so the price of fluorine-lined ball valves is relatively high. The PPS anti-corrosion coating 40 provided in this application uses electrostatic spraying and high-temperature sintering for molding, and the manufacturing process requirements are lower than those of fluorine-lined ball valves, which is also convenient for cost reduction.

[0063] In this embodiment, the materials of the valve ball 30, the valve body 10, the valve stem 70, the valve nozzle 60 and the valve cover 20 are preferably steel.

[0064] In this embodiment, the PPS anti-corrosion coating 40 has a uniform thickness and smoothly transitions on the side walls of the valve ball 30, the valve body 10 and the valve cover 20;

[0065] The thickness range of the PPS anti-corrosion coating 40 is 0.35 mm.

[0066] That is, in the actual production operation process, the technical requirements are as follows: there shall be no sharp angles at the spraying positions of the components. If there are corners at the spraying positions, an arc transition structure shall be adopted at the corners, and the minimum transition radius is 0.5 mm. The coating thickness requirements are appropriate, so that the structures of the valve body 10 and the valve cover 20 are close to the dimensions of ordinary ball valves. Too thick a coating is not conducive to cost reduction. The coating is wear-resistant, and its thermal expansion coefficient is equivalent to that of steel, which can effectively prevent creep and coating delamination problems.

[0067] In this embodiment, it further includes a first seal 51. The first seal 51 has a first contact portion 511 and a second contact portion 512. The first contact portion 511 is used to contact the valve ball 30, and the second contact portion 512 is used to contact the valve body 10 or the valve cover 20, so that the valve ball 30 abuts against the valve body 10 and the valve cover 20 through the first seal 51.

[0068] In actual use, PPS anti-corrosion coatings 40 are respectively formed on the side walls of the valve ball 30, the valve body 10 and the valve cover 20 that are respectively in contact with the first seal 51.

[0069] In this embodiment, the first contact portion 511 is an arc-shaped structural surface adapted to the outer side wall of the valve ball 30.

[0070] In this embodiment, convex annular platforms 513 adapted to the first seal 51 are respectively provided on the valve body 10 and the valve cover 20;

[0071] The second contact portion 512 is a concave annular groove 514 adapted to the convex annular platform 513, and the corner of the concave annular groove 514 is in an arc transition structure.

[0072] In this embodiment, the concave annular groove 514 is provided on the side close to the inner circle of the first seal 51, and the corner of the concave annular groove 514 is an arc with a radius of 0.5 mm.

[0073] In this embodiment, the width of the concave annular groove 514 is 2 mm; the depth of the concave annular groove 514 is 2 mm.

[0074] On the one hand, the first seal 51 is provided with the concave annular groove 514 and is matched with the convex annular platforms 513 on the valve body 10 and the valve cover 20, which is convenient for limiting the first seal 51, that is, the first seal 51 is effectively assembled on the valve body 10 and the valve cover 20, preventing the valve ball 30 from rotating and the sealing ring from running out of the seal seat during the process of opening and closing the valve; on the other hand, the arc transition of the concave annular groove 514 can improve the elasticity of the first seal 51, reduce the torque during the process of opening and closing the valve, reduce the friction between the first seal 51 and the valve ball 30, and improve the service life of the first seal 51.

[0075] In this embodiment, a second seal 52 is further included, and the second seal 52 is arranged between the valve body 10 and the valve cover 20 that are buckled with each other;

[0076] PPS anti-corrosion coatings 40 are respectively formed on the side walls of the valve body 10 and the valve cover 20 that are buckled with each other.

[0077] During actual use, PPS anti-corrosion coatings 40 are respectively formed on the side walls of the valve body 10 and the valve cover 20 that are respectively in contact with the second seal 52.

[0078] In this embodiment, a valve nozzle 60, a third seal 53 and a fourth seal 54 are further included. A valve stem 70 is fixedly connected to the valve ball 30. An installation opening is provided on the valve body 10, and the valve stem 70 passes through the installation opening of the valve body 10 through the valve nozzle 60;

[0079] The third seal 53 is arranged between the valve body 10 and the valve nozzle 60;

[0080] The fourth seal 54 is arranged between the valve stem 70 and the valve nozzle 60;

[0081] The side wall of the valve nozzle 60 exposed in the accommodation space 2 is formed with a PPS anti-corrosion coating 40;

[0082] The side walls of the valve nozzle 60 in contact with the mounting port of the valve body 10 and the valve stem 70 are respectively formed with a PPS anti-corrosion coating 40;

[0083] The side walls of the valve stem 70 exposed in the accommodation space 2 and in contact with the valve nozzle 60 are respectively formed with a PPS anti-corrosion coating 40.

[0084] In this embodiment, the valve ball 30 and the valve stem 70 are integrally formed.

[0085] In this embodiment, an electrostatic grounding point 701 is formed on the valve stem 70.

[0086] The valve ball 30 and the valve stem 70 are of an integral structure, and an electrostatic grounding point 701 is provided on the valve stem 70, so that the anti-corrosion part can be spray-coated at one time, and full anti-corrosion can be achieved without additional structure, which is convenient for spray-coating operation and reduces production costs.

[0087] In this embodiment, a handle 80 is connected to the valve stem 70. The handle 80 is used to drive the valve ball 30 to rotate to realize the opening and closing of the valve. When the valve ball 30 is rotated so that the liquid flow channel 1 of the valve ball 30 communicates with the liquid flow channel 1 of the valve body 10 or the valve cover 20, the valve is in an open state.

[0088] In actual use, the side walls of the valve body 10 and the valve nozzle 60 in contact with the third seal 53 are respectively formed with a PPS anti-corrosion coating 40;

[0089] In this embodiment, the first seal 51, the second seal 52, the third seal 53 and the fourth seal 54 are all made of high-temperature resistant anti-corrosion materials.

[0090] In this embodiment, the first seal 51, the second seal 52, the third seal 53 and the fourth seal 54 are all wear-resistant sealing rings.

[0091] In actual use, the side walls of the valve nozzle 60 and the valve stem 70 in contact with the fourth seal 54 are respectively formed with a PPS anti-corrosion coating 40.

[0092] In this embodiment, the contact surface where the valve body 10 is fastened to the valve cover 20, the end faces of the valve body 10, the end faces of the valve cover 20, the contact surface where the valve body 10 is in contact with the valve nozzle 60, and the contact surface where the valve nozzle 60 is in contact with the valve stem 70 are all formed with a PPS anti-corrosion coating 40.

[0093] In this embodiment, a communication hole 301 is provided on the valve ball 30, and the communication hole 301 is used to communicate the accommodation space 2 with the liquid flow channel 1 of the valve ball 30.

[0094] In actual use, the ball valve needs to be stored and shipped in an open state. When the external temperature changes, a pressure difference will be formed between the accommodation space 2 outside the valve ball 30 and the liquid flow channel 1 of the valve ball 30, resulting in an airtight phenomenon, which makes it difficult to open the valve or causes damage to the first seal 51. The provision of the communication hole 301 keeps the pressure difference between the accommodation space 2 outside the valve ball 30 and the liquid flow channel 1 of the valve ball 30 always zero, that is, no pressure difference will be formed or airtightness will occur.

[0095] The above are only the preferred embodiments of the present invention, and thus do not limit the patent protection scope of the present invention. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention, directly or indirectly applied in other related technical fields, shall be similarly included in the protection scope of the present invention.

Claims

1. A PPS anti-corrosion ball valve, characterized in that: It includes a valve body, a valve cover and a valve ball, which respectively form a liquid flow channel. The valve cover and the valve body are buckled together to form a accommodating space. The valve ball is located in the accommodating space and rests on the valve body and the valve cover. The side walls of the valve ball, valve body and valve cover exposed in the liquid flow channel are respectively formed with PPS anti-corrosion coatings.

2. A PPS anti-corrosion ball valve as claimed in claim 1, characterized in that: The PPS anti-corrosion coating is formed on the side walls of the valve ball, the valve body and the valve cover exposed in the accommodating space respectively.

3. A PPS anti-corrosion ball valve as claimed in claim 1 or 2, characterized in that: The PPS anti-corrosion coating is formed by electrostatic spraying and is formed by high-temperature sintering.

4. A PPS anti-corrosion ball valve as claimed in claim 1 or 2, characterized in that: The PPS anti-corrosion coating has a uniform thickness and a smooth transition on the side walls of the valve ball, valve body and valve cover; The thickness of the PPS anti-corrosion coating ranges from 0.3 mm to 0.5 mm.

5. A PPS anti-corrosion ball valve as claimed in claim 1, characterized in that: It also includes a first seal having a first contact portion and a second contact portion, the first contact portion is used to contact the valve ball, and the second contact portion is used to contact the valve body or the valve cover, so that the valve ball is pressed against the valve body and the valve cover through the first seal.

6. A PPS anti-corrosion ball valve as claimed in claim 5, characterized in that: The first contact portion is an arc-shaped structural surface adapted to the outer side wall of the valve ball.

7. A PPS anti-corrosion ball valve as claimed in claim 5, characterized in that: The valve body and the valve cover are respectively provided with a convex ring platform matched with the first sealing member; The second contact portion is a concave annular groove adapted to the convex annular platform, and the corner of the concave annular groove is an arc transition structure.

8. A PPS anti-corrosion ball valve as claimed in claim 1, characterized in that: Also includes a second sealing member, the second sealing member is arranged between the valve body and the valve cover which are buckled with each other; The PPS anti-corrosion coating is respectively formed on the side walls of the valve body and the valve cover that are buckled with each other.

9. A PPS anti-corrosion ball valve as claimed in claim 1, characterized in that: It also includes a valve nozzle, a third sealing member and a fourth sealing member, wherein a valve stem is fixedly connected to the valve ball, a mounting opening is provided on the valve body, and the valve stem is inserted through the valve nozzle and mounted on the mounting opening of the valve body; The third sealing member is arranged between the valve body and the valve nozzle; The fourth sealing member is arranged between the valve stem and the valve nozzle; The side wall of the valve nozzle exposed to the accommodating space is formed with the PPS anti-corrosion coating; The side walls of the valve nozzle that are in contact with the mounting opening of the valve body and the valve stem are respectively formed with the PPS anti-corrosion coating; The side wall of the valve stem exposed to the accommodating space and the side wall in contact with the valve nozzle are respectively formed with the PPS anti-corrosion coating.

10. A PPS anti-corrosion ball valve as claimed in claim 1, characterized in that: The valve ball is provided with a communication hole, and the communication hole is used to connect the accommodating space with the liquid flow channel of the valve ball.

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