Valve system for opening and closing a bypass stream in an exhaust gas pipe of a combustion engine comprises a pressure cylinder, a first spring and a second spring arranged in a serial power flow with the first spring

摘要

Valve system (1) comprises a pressure cylinder (6) formed as a two-stage lifting cylinder, a first spring (13) and a second spring (14) arranged in a serial power flow with the first spring to create a pressure-lift characteristic with a first and a second gradient, in which the first gradient runs flatter than the second gradient. Preferred Features: The first spring or the second spring is pre-stressed in the pressure-less state of the pressure cylinder. The first spring presses against a stop (16) and the second spring lies on a piston (11) and presses against a stop stage.