Pressure seal for vacuum servo - has bellows over valve and with profiled seals to chamber and valve housing

摘要

The pressure seal for a vacuum servo has a flexible bellows (7) with profiled seals at each end to fit to the valve housing (1) and to the servo housing (1). The seal accommodates relative movement between the valve and the servo and ensures low losses for maximum braking control. One seal (4) has a ring shaped groove to fit over the end of the valve housing, and is held in place by the pipe fitting. The other seal is stretched over the servo housing, with the end of the housing braced on the valve housing by a sliding, non sealing ring (6) held in the flanged end of the servo housing.