1. Description:
The metal ring gasket refers to the metal gasket of octagonal-shaped, oval-shaped, RX-shaped or BX-shaped section by processing metal materials. It is self-tightening in diameter direction and has good sealing as the contact between gasket and the inside and outside surface of terracing glove is pressed tightly and keepgood sealing performance.

The gasket is installed inside the terracing ring glove of flange surface. When the connection bolt is fastened, it is compressed in axis direction and sticks tightly to the upper and lower terracing glove.As a result, the plastic deformation is yielded and a ring-shaped sealing strap is formed. After pressure is raised, the ring gasket expands in diameter direction under the force of media pressure. The gasket sticks more tightly to the sloping surface of terracing glove, thus becoming self-tightening. However, the rise of media pressure will deform the flange and connection bolt, and lead to the relevant separation from sealing surface, and the sealing ratio of gaskets reduce accordingly, and the ring gasket can be regarded as semi-self-tightening.
The octagonal-shaped ring gasket matches with flange glove in the form of surface contact. Compared with oval-shaped ring gasket, the octagonal-shaped ring gasket can not seal closely with flange glove, but can be used again and is easy to be process as its section constitute different lines. The oval-shaped ring gasket contacts the flange glove in linear form, but with good sealing performance. However, the high processing precision increases the manufacturing cost, and the oval-shaped ring gasket can't be used again.