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Basic knowledge of O-rings

by:ORK      2022-10-26
The O-ring is a small cross-section annular sealing element, and the common cross-section is circular. The main material is synthetic rubber, which is the most commonly used seal in hydraulic engineering, mainly used for static seal and sliding seal. Compared with other seals, it has the following characteristics: 1. Good sealing performance and long service life; a single ring can seal in two directions; 2. Good adaptability to oil, temperature and pressure; 3. Small dynamic friction resistance; Small size, light weight and low cost; 4. The sealing part has a simple structure and is easy to disassemble; 5. It can be used for both static sealing and dynamic sealing; 6. The dimensions and grooves have been standardized, which is convenient for selection and outsourcing. Disadvantages: When the dynamic seal is started, the frictional resistance is relatively large, about 3 to 4 times the dynamic friction force, and it is easy to be squeezed into the gap under high pressure. The following points are mainly considered in the selection of O-ring materials: 1. The working state of the O-ring refers to whether the O-ring is used for static sealing, dynamic sealing or sliding sealing; 2. The working state of the machine refers to whether the machine is working continuously or intermittently, And consider the length of each intermittent time and whether there is an impact load acting on the sealing part; 3. The working medium is gas or liquid, and its physical and chemical properties are considered; 4. Working pressure and fluctuation range and frequency and instantaneous maximum pressure, etc.; 5. Working temperature includes instantaneous temperature and alternating hot and cold temperature; 6. Price and source. Generally speaking, nitrile rubber for oil resistance, chloroprene rubber for ozone resistance, acrylate rubber or fluorine rubber seals for heat resistance, polyurethane rubber seals for high pressure and wear resistance, and copolychlorohydrin rubber for cold resistance and oil resistance, etc. Company website: https://www.orksealing.com/
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