Sealing ring, particularly breathable semi-permeable sealing-O-ring for use with diaphragm valve for ventilation of cavities, has elastomeric layers for sealing fluids and semi-permeable gas-permeable membrane

摘要

The sealing ring has elastomeric layers for sealing fluids and a semi-permeable gas-permeable membrane that is used for imparting a supplementary function of a pressure equalization element. A sealing-O-ring is provided with an upper sealing ring (2), a middle layer (3) and a lower sealing ring (4), where the three layers are integrally connected to each other.