Butterfly valve device for an exhaust brake

摘要

(57) Abstract Objective Bearing the revolving shaft of the needle the bearing component, high temperatureThe fact that it is exposed to the exhaust air gas is prevented. Constitution Installing bearing component 17 in outside direction seal component 16 compared toAs it does, seal component 16 compared to inside bearing 11 of inner splitIt communicated peripheral surface and downstream side of needle 12, with communication path 19Due to especially, as for the exhaust air gas inflow into revolving shaft 13 side, the sealBeing obstructed by component, 16 not to arrive up to bearing component 17,The ri, the exhaust air gas at the same time inflow, through communication path 19 needle 12From it makes discharge rapidly inside the pipe conduit of low pressure of downstream side.