SEALING UNIT FOR MOVABLE CONNECTION Russian patent published in 2006 - IPC F16K5/06 

FIELD: valving.

SUBSTANCE: sealing unit comprises ring unit. The first member of the ring unit is mounted in the ring groove in the housing. The second member of the ring unit mates with the surface of the counterpart for permitting contact. The ring unit has two sealing ring bodies. The first ring body is made of a material that exhibits heightened hardness and strength. The second ring body is made of more soft and flexible material, e.g. thermo-expandable graphite. The first body is made of three-dimensional reinforcing frame permeable ring whose surface mates with the counterpart for permitting contact and has collars bent outward from its surface. The pore space of the ring is preliminary filled with a heat-resistant material whose strength, density, hardness, and durability are higher than theses of the first sealing heat-resistant member. The first and second sealing bodies are interconnected.

EFFECT: enhanced durability and prolonged service life.

4 cl, 3 dwg