How about the price of pneumatic symbol for stainless steel pneumatic ball valve? The development of centrifuge is manifested in the continuous improvement of structure and the improvement of centrifuge method. The improvement of structure is first reflected in the increase of rotating speed. The ultrahigh speed centrifuge that has developed from only a few tens of revolutions at the beginning to hundreds of thousands of revolutions today has gone through six generations, and the life of the drive system has increased from 100 million revolutions to 20 billion revolutions; The working time increases from several hours to ten hours or days; The types of centrifugal rotors (turning heads) are continuously improved and increased; The automation degree of control is continuously improved; The body shape is developing towards beauty, practicality and miniaturization The great progress is the continuous enrichment and development of centrifugation methods; The application scope of centrifuge is constantly expanded. The transmission mode of the centrifuge has gone through the process from manual to pneumatic, mechanical speed change, mechanical speed change driven by oil pressure and air pressure, to variable frequency motor speed change today. At the end of the 19th century and the beginning of the 20th century, centrifuges remained in a low-speed pneumatic state. In the 1920s, ultrahigh speed centrifuges appeared. DuPont produced oil turbine centrifuges, and in 1933, air turbine centrifuges were launched, which used compressed air to drive the worm wheel and then drive the centrifuge to rotate; In 1955, American Beckman Company launched a pneumatic centrifuge with a speed of up to 10000 rpm. After the 1970s, the application of high-speed motors, namely variable frequency motors, appeared. In the 1980s, the combination of variable condensing motors and microcomputers has greatly improved the speed and performance of the centrifuge. After entering the's, the centrifuge technology has become mature, It meets the needs of scientific research, production and medicine.