Gas main stop valve - has sealing ring fixed on butterfly trunnion and turning in bearing bore

摘要

The gas main stop valve has a butterfly rotating on an axis with a peripheral seal, being particularly for ventilation systems. a sealing ring (6) in the bore of the bearing (2) accommodating the pivot trunnion (3) of the butterfly (4) turns in this bore and is fixed to the trunnion. It can work in a counterbore portion (7), to which a lubricant supply passage (9) leads. The cylindrical periphery of the sealing ring (8) on the butterfly can be in gaslight contact with the portion of the ring (6) protruding from the counterbore.