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O-rings are one of the most common seals in manufacturing today. It is a simple, effective design.
O-rings are not expensive and are very simple to install, yet they offer tremendous sealing capacity. O-ring seals are generally divided into two main groups. Static seals, in which there is little or no relative motion between the mating surfaces; and dynamic seals, which must function between surfaces with definite relative motion, such as the seal on the piston of a hydraulic cylinder. Of the two types, dynamic sealing is the more difficult and requires more critical design work and materials selection. The most common type of dynamic motion utilizing an O-ring sealing system is reciprocal motion as found in hydraulic cylinders, actuators and the like.