There are many factors affecting the sealing performance of pneumatic ball valve, such as the coaxiality between the pneumatic ball valve, upper valve stem and lower valve stem. The roundness and smoothness of the ball, the roundness of the 90 degree conical surface of the valve seat, the preload of the O-ring of the valve seat, the preload of the compression spring, etc. Therefore, how to solve these problems has become the key to the sealing of pneumatic ball valves.

As more and more types of work in the industrial field require the use of fluorine lined valves, and the variety of fluorine lined valves makes it difficult for many people to choose to use them. Therefore, Shanghai Dongfeng Pump Valve Factory has integrated and edited the types of fluorine lined valves and their applicable working conditions in response to this phenomenon, as described below:
1. Fluorine lined Y-type filter: Fluorine lined Y-type filter is used to remove impurities in corrosive media and protect the normal use of pumps, valves and other equipment. Generally, the water supply network is 20-60 mesh/cm2, and the air supply network is 40-100 mesh/cm2. The oil supply network is 100-480 mesh/cm2. It can be configured according to the media. Since the inner wall and filter screen of the filter are made of tetrafluoroethylene with strong corrosion resistance, the product is widely used in various corrosive pipelines. 　　
2. Fluorine lined discharge valve: Fluorine lined discharge valve uses fluoroplastic as the lining of pneumatic ball valve, and is equipped with a new type of ball structure with rod. In addition, its unique elastic lip seal seat structure makes it have the advantages of ordinary pneumatic ball valve, and can have high sealing performance and low operating torque within the range of large pressure difference and large temperature difference. It can be used for switching or regulating. This product is suitable for liquid feeding in various industrial production, and can work well in various acid, alkali, salt and other strong corrosive media. 　　
3. Fluorine lined diaphragm valve: Fluorine lined diaphragm valve is a special type of valve with cut-off function. Its sparing closure is composed of a diaphragm made of steel disc and soft materials (rubber and fluoroplastic composite), and separates the inner cavity of the valve body from the inner cavity of the valve cover to cut off the medium in the pipe. 　　
4. Fluorine lined stop valve: Fluorine lined stop valve is a kind of anti-corrosion valve produced by the overall rubber coating technology. All the internals are integrally lined with anti-corrosion materials, with excellent anti-corrosion performance, suitable for various strong corrosion conditions, simple operation and long service life. 　　
5. Fluorine lined vertical check valve: Fluorine lined check valve (also called check valve) is a type of valve that only allows the medium to flow in one direction and prevents the flow in one direction. Usually, this valve works automatically. Under the action of fluid pressure flowing in one direction, the valve disc opens; When the fluid flows in the opposite direction, the fluid pressure and the self reclosing valve disc of the valve disc act on the valve seat to cut off the flow. 　　
6. Fluorine lined manual pneumatic ball valve: Fluorine lined pneumatic ball valve uses a ball with a circular through hole as the opening and closing part, and the ball rotates around the center line of the valve body with the valve stem to realize the opening and closing of the valve. The special molding process is adopted to make the sealing surface compact and good, and the combination of V-shaped PTFE packing makes the valve reach zero leakage; The ball and the valve stem are cast as a whole, which eliminates the possibility of the valve stem punching out of the pressure part due to the pressure change, and fundamentally ensures the safety in use; All plastic lining process is adopted to resist strong corrosion of medium. 　　
7. Fluorine lined lift check valve: the valve disc of the fluorine lined check valve is in the form of a disc and rotates around the rotating shaft of the valve seat channel. Because the channel inside the valve is linear in flow, the flow resistance is smaller than that of the butterfly type check valve, and it is suitable for large caliber occasions with low flow rate and infrequent flow changes
8. Fluorine lined plug valve: there are two basic series of fluorine lined plug valve: 1. X43F4 type: sealing pair composed of specially designed valve seat bushing (PTFE or aligned polystyrene) and steel plug body; The plug body is stainless steel (unlined). 2. X43F46 type: FEP is lined on the surface of all valves and plug channels. And lining PFA, PCTFE and temperature up to 300 according to the above basic types. C. The new material of aligned polyphenyl used for inlaying the valve seat can meet the needs of various working conditions. X43F4 and X43F46 self-lubricating plug valves have unique rocker arm adjustment device and ideal plug cone angle design, good sealing performance, long service life, the advantages of simultaneous sealing at the inlet and outlet ends, small friction coefficient of the sealing pair during the whole working process, flexible operation of the plug body, and no lubrication for ever. 　　
9. Fluorine lined gate valve: Fluorine lined gate valve is a kind of valve. The opening and closing part of fluorine lined gate valve is the gate. The movement direction of the gate is perpendicular to the fluid direction. The gate valve can only be fully opened and closed, and cannot be adjusted or throttled. The gate has two sealing surfaces. The two sealing surfaces of the most commonly used mode gate valve form wedges. The wedge angle varies with the valve parameters, usually 50, and it is 252 'when the medium temperature is not high. The gate of wedge gate valve can be made into a whole, which is called rigid gate; It can also be made into a ram that can produce slight deformation to improve its processability and make up for the deviation of sealing surface angle during processing. This ram is called elastic ram. 　　
10. Wafer type fluorine lined butterfly valve: there are two basic types of wafer type fluorine lined butterfly valve: D71 series midline butterfly valve and D73 series eccentric butterfly valve. The two-piece valve body combination is adopted, and the valve seat and valve body lining are integrated. When the valve works, only the full plastic valve seat and the plastic lining butterfly plate are in contact with the medium, and the valve can withstand the medium corrosion introduced by the lining material. The four pole sealing structure is adopted, and the sealing surface is equipped with a temperature resistant and aging resistant SI rubber elastic gasket, completely achieving zero leakage of the medium. 　　
11. Flange type fluorine lined butterfly valve The flange type fluorine lined butterfly valve uses a PTFE lined butterfly plate with a spherical sealing surface, which is matched with a silicone rubber gasket at the base of the valve seat to adjust the sealing performance of the valve; The valve is easy to operate, with tight sealing performance and long service life; It can be used to quickly cut off or adjust the flow. It is suitable for occasions requiring reliable sealing and good adjustment characteristics. The valve body is split, and the sealing at both ends of the valve shaft is controlled by the rotating base surface between the butterfly plate and the valve seat plus fluororubber, so as to achieve compact product structure, beautiful appearance, reasonable process and reliable performance. Ensure that the valve shaft does not contact with the fluid medium in the cavity. It is very convenient to replace the valve shaft. The valves can be completed without removing the pipeline. The products are widely used for the transportation of liquid and gas (including steam) in pipelines in various industrial fields, especially for the occasions with severely corrosive media, such as sulfuric acid, hydrofluoric acid, phosphoric acid, chlorine, aqua regia and other highly corrosive media. 　　
13. Right angle fluorine lined stop valve: The right angle fluorine lined stop valve has the advantages of compact structure, flexible opening and closing, strong corrosion resistance, short stroke (generally 1/4 of the nominal diameter), etc. It is widely used as cut-off medium in petroleum, chemical and other pipeline systems. However, the plastic lined cut-off valve is strictly prohibited from flow regulation to prevent the high-speed medium flow generated at the orifice from eroding and damaging the sealing surface. The valve disc and valve stem are designed as an integrated structure to prevent the possibility of the internals rushing out of the valve body due to the pressure fluctuation of the pipeline. It is compact in structure and safe in use. 　　
14. Direct flow fluorine lined stop valve: the surface of the inner cavity of the direct flow fluorine lined stop valve body and the surface of the parts such as the valve cover, valve disc, and valve stem in contact with the medium are lined with PFEP plastic. Therefore, it has the best corrosion resistance. It is suitable for various concentrations of hydrochloric acid, sulfuric acid, hydrofluoric acid, aqua regia, nitric acid, various organic acids, strong bases, strong oxidants or alternate concentrations, alternate acids and bases, various organic concentrates and other strong corrosive media. FEP (F46) and PCTFE (F3) fluorine lined DC stop valves are applicable to aqua regia, sulfuric acid, hydrochloric acid, hydrofluoric acid and various organic acids, strong acids and strong oxidants of various concentrations at - 50 ℃~150 ℃. FEP is also applicable to pipelines with strong alkaline organic solvents of various concentrations and other corrosive gases and liquid media. 　　
15. Fluorine lined pneumatic ball valve: Fluorine lined pneumatic ball valve and plug valve belong to the same type of valve, but the difference is that the pneumatic ball valve uses a ball with a circular through hole as the opening and closing part, and the ball rotates around the center line of the valve body with the valve stem to achieve the purpose of opening and closing the valve. 　　
16. Fluorine lined swing check valve: the valve disc of the fluorine lined check valve is disc shaped and rotates around the axis of the valve seat channel. Because the channel inside the valve is streamline, the flow resistance is smaller than that of the rising butterfly check valve. It is suitable for large caliber occasions with low flow rate and infrequent flow changes. It can be used in sulfuric acid, nitric acid, acetic acid, phosphoric acid, hydrochloric acid, hydrogen perchloride Normal use under strong corrosive media such as aqua regia
17. Fluorine lined double clip check valve: the function of fluorine lined check valve is to allow the medium to flow in one direction only and prevent the flow in one direction. Usually, this valve works automatically. Under the action of fluid pressure flowing in one direction, the valve disc opens; When the fluid flows in the opposite direction, the fluid pressure and the self reclosing valve disc of the valve disc act on the valve seat to cut off the flow. 　　
18. Fluorine lined non rising stem gate valve: Fluorine lined gate valve is an anti-corrosion valve produced by lining anti-corrosion plastic and overall rubber coating technology. It can be widely used as a regulating and intercepting device for corrosive media on pipelines of tap water, sewage, construction, petroleum, chemical industry, food, medicine, textile, power, ship, metallurgy, energy system, etc. 　　
20. Fluorine lined pneumatic diaphragm valve: Fluorine lined diaphragm valve is a special type of block valve, which appeared in the 1920s. Its opening and closing part is a diaphragm made of soft material, which separates the inner cavity of the valve body from the inner cavity of the valve cover and the driving parts, so it is called the diaphragm valve. 　　
21. Fluorine lined worm gear pneumatic ball valve: Fluorine lined pneumatic ball valve uses a ball with a circular through hole as the opening and closing part, and the ball rotates with the valve stem around the center line of the valve body to open and close the valve. Special molding process is adopted to ensure good sealing, and the combination of V-shaped packing makes the valve reach zero leakage; The ball and the valve stem are cast as a whole, which eliminates the possibility of the valve stem punching out of the pressure part due to the pressure change, and fundamentally ensures the safety in use; All plastic lining process is adopted to resist strong corrosion of medium.