The O-ring is a circular rubber ring with a cross-section, which is of type O, it is called O-type seal ring, also known as the O-ring, began to appear in the 19th century century, when used as a steam engine cylinder seals, is the hydraulic and pneumatic transmission system used the most extensive one, usually in Taiwan, the Japanese enterprises called O-ring.
The O-ring is a circular rubber ring with a round section. It is mainly used for mechanical parts to prevent leakage of liquid and gas media under static conditions. In some cases, O-type seals can also be used for axial reciprocating motion and low-speed rotational motion of the dynamic sealing elements, according to different conditions, can choose different materials to adapt to it.