The Difference and Application of KF, ISO, NW, CF in Vacuum Accessories
In vacuum systems, we often encounter flanges of various specifications, such as CF, KF, NW, ISO, etc. These series of flanges are used in vacuum systems commonly used in sealed connections, but the distinction between these flanges and using, a lot of friends are not very clear, now discuss these issues with everyone.
CF series: CF flanges are relatively easy to distinguish. They are mainly used for sealing connections in ultra-high vacuum systems. The main sealing method is metal sealing, that is, copper gasket sealing. It should be noted that the copper gasket will have a poor sealing effect after being used once. If the system requires a high degree of vacuum, the gasket needs to be replaced every time the flange is disassembled.
KF series: KF is a more common sealed connection method in daily vacuum systems. It is mainly used in high vacuum systems. The specifications are from KF10-KF50. Generally, the size of the pipe connected by KF is relative to the inch specification. That is, the pipeline corresponding to KF25 is 25.4 * 1.65mm, and so on (some require special pipelines, and the welding size of the flange can be customized). The vacuum connection from the largest KF to KF50 (piping is 50.8 * 1.65mm) is the ISO series
ISO series: ISO is also an accessory used in high vacuum systems. The minimum specification is ISO63 (piping is 63.5 * 1.65mm), and the latter is ISO80, ISO100, ISO160 up to ISO320 and even larger specifications. It is mainly two ISO flanges, with a seal ring in the middle, and then four flanges are used to hold the flanges for connection. It should be noted that, in general, the ISO series sealing ring has a center bracket and a fluororubber sealing ring compared to the KF series vacuum sealing ring. It also has an aluminum spring outer ring. Its main function is to prevent sealing. The ring slipped off. Because the size of the ISO series pipes is relatively large, the sealing ring is affected by the vibration or temperature of the machine on the center support. If it is not fixed, it will slip off and affect the seal.
NW series: NW is also a vacuum accessory used in high-vacuum systems, which is the Japanese standard, so NW vacuum accessories are relatively more used in Japanese companies or Japanese equipment. Earlier, we said that the ISO series uses two ISO flanges and four double hooks to connect, while the NW is connected by two NW flanges together and connected by chain clamps (N63 The appearance of the flange is the larger NW50 flange).
I do n’t know if you know the flanges of these specifications. If you have any questions about vacuum accessories or systems, you can contact Labideal.com and we will discuss them together.
Labideal.com is a company specializing in customizing pipes, fittings, chambers and other products for ultra-high clean gas pipelines, fittings, valves and vacuum system accessories (KF, ISO, CF series). The company’s products are mainly supplied to ultra-pure fluid, gas transportation and vacuum systems for high-end technology industries, such as wafer manufacturing, chip manufacturing, liquid crystal display, fiber optic communication, solar photovoltaic, scientific research institutions, and biopharmaceutical, food and other industrial customers.
Microelectronics, biochemical medicine, and other industries’ process optimization and improvement are changing rapidly with the perfect combination of materials, processes and equipment. The variety of materials are just like the continuous blood flowing from the high-tech giant. With the rapid growth of China’s high-tech industry, the clean materials industry has become one of the most important basic industries, and it also leads the future development direction.
Labideal is committed to providing customers with the rapid development of solar photovoltaic cells, semiconductor solid-state lighting (LED), fiber optics, biochemical medicine and other high-tech fields in China with a variety of clean products required for system integration. Through the close combination of ultra-high clean materials and process-critical systems, we can provide our customers with various services and support.
Labideal will integrate resources by independent research and development, production, commissioning, agency, and operation to ensure the supply of ultra-high clean materials. At the same time, Labideal will actively cooperate with customers and adhere to the development and application of new materials. , And strive to help customers achieve improvements in process technology and technological breakthroughs, improve product quality and yield.
