3、 Advantages of pneumatic ball valve
1. It has the lowest flow resistance (actually zero).
2. It can be reliably used in corrosive media and low boiling point liquids because it will not get stuck during operation (without lubricant).
3. Complete sealing can be achieved within a large pressure and temperature range.
4. It can realize fast opening and closing, and the opening and closing time of some structures is only 0.05~0.1s to ensure that it can be used in the automation system of the test bench. When quickly opening and closing the pneumatic ball valve, there is no impact during operation.
5. The spherical closure can be automatically positioned in position.
6. The working medium shall be reliably sealed on both sides.
7. When fully open and fully closed, the sealing surfaces of the ball and valve seat are isolated from the medium, so the medium passing through the pneumatic ball valve at high speed will not cause erosion of the sealing surface. 8. With compact structure and light weight, it can be considered as the most reasonable pneumatic ball valve structure for cryogenic medium system.
9. The valve body is symmetrical, especially the welded valve body structure, which can well withstand the stress from the pipeline.
10. The closing element can withstand the high differential pressure when closing.
11. The pneumatic ball valve with fully welded valve body can be directly buried underground, so that the internal parts of the pneumatic ball valve are not corroded, and the maximum service life can reach 30 years. It is the most ideal pneumatic ball valve for oil and natural gas pipelines. Introduction to high-pressure pneumatic ball valve: high-pressure pneumatic ball valve is defined in GB/T21465-2008 Terminology of Pneumatic Ball Valve as a pneumatic ball valve whose opening and closing parts (ball) are driven by the valve stem and rotate around the axis of the valve stem. High pressure pneumatic ball valve was introduced in the 1950s. With the rapid development of science and technology, the continuous improvement of production process and product structure, it has rapidly developed into a major valve category in a short period of 40 years. In western countries with developed industries, the use of high-pressure pneumatic ball valves is increasing year by year. In China, pneumatic ball valves are widely used in petroleum refining, long-distance pipeline, chemical industry, paper making, pharmacy, water conservancy, power, municipal administration, steel and other industries, and occupy a pivotal position in the national economy. The high-pressure pneumatic ball valve is mainly used to cut off or connect the medium in the pipeline, as well as to regulate and control the fluid. The hard sealed V-shaped pneumatic ball valve has a strong shear force between its V-shaped ball core and the metal valve seat of hardfacing carbide, which is especially suitable for media containing fiber, small solid particles, etc. The multi vent ball valve can not only flexibly control the confluence, diversion and flow direction switching of media on the pipeline, but also close any channel to connect the other two channels. This type of pneumatic ball valve shall be installed horizontally in the pipeline. Working principle of high-pressure pneumatic ball valve: high-pressure pneumatic ball valve can rotate 90 degrees. The plug body is a ball with a circular through hole or channel passing through its axis. The pneumatic ball valve is mainly used to cut off, distribute and change the flow direction of the medium in the pipeline. It can be closed tightly with only 90 degree rotation and a small rotating torque. Pneumatic ball valve is most suitable for use as switch and shut-off valve, but recent development has designed pneumatic ball valve to be used for throttling and flow control, such as V-type pneumatic ball valve. The main characteristics of the high-pressure pneumatic ball valve are its compact structure, reliable sealing, simple structure, convenient maintenance, and the sealing surface and spherical surface are often closed, not easy to be eroded by the medium, easy to operate and maintain. It is suitable for general working media such as water, solvent, acid and natural gas, and also suitable for media with poor working conditions, such as oxygen, hydrogen peroxide, methane and ethylene, It is widely used in various industries. The valve body of the pneumatic ball valve can be integral or combined.

How to distinguish the authenticity of metal conduit? According to the tips of some experts, we summarize the following three points:
First, check whether there are sundries. If the content of sundries is high, it is naturally a fake product; The second is to check the cross section of the metal conduit. The cross section of ordinary fake and inferior products is mostly oval or irregular rather than round; Third, check the inner diameter of the metal threading pipe. The inner diameter of ordinary and good products will not change too much, and it is also relatively easy to use; The fourth is to check whether there is any sign of folding. If there is folding, it is a fake product.
Three key points of metal conduit device
Metal conduit is generally made of steel materials, and the use of metal conduit can isolate the lines in open soil or water environment. Although the price of steel material is high, it can maintain the line well and prevent the line from being corroded by the outside. Therefore, it is very advocated by the government when laying the line. In addition, the metal conduit is very easy to use, and only needs to be directly installed in the environment of the required line. Even if the line needs to be changed, it is also more convenient to change the line because of the use of threading pipes, and there is no need to clean again.
At present, with more and more electricity in the center, in order to ensure the safety of the line and avoid the damage of the wire from impact, friction, corrosion and even explosion, it is necessary to have enough metal conduit to stop the maintenance of the line. Therefore, all kinds of wires and data lines with metal core as the main part are widely used, and metal conduit is also widely used in construction, agriculture and other fields correspondingly.