Shaft seal for butterfly valve stems for valve flaps on valve flap supports

摘要

The shaft seal has a roller bearing (1) arranged between a flap shaft (2) and a valve flap housing (5). A sealing element (3a) is arranged between the roller bearing and the inner channel (K) of a valve flap nozzle between the flap shaft and the valve flap housing. The sealing element is directly arranged on the roller bearing as sleeve sealing with one edge engaged in a valve flap housing groove and another edge engaged in a flap shaft groove.