Wheel brake cylinder pressure control system - has first valve shut and second opened by input pressure for output pressure modulation

摘要

The pressure control valve system modulates an output pressure (PA), particularly for a wheel brake cylinder in dependence on an input pressure (PE). It has a valve determining a first change-over threshold level and a spring (15) setting a second one. The first valve (9,10) is pressurised in the shutting direction by the input pressure, while a second one (13,14,15) is pressurised by it in the opening direction. The valves have a positive amount of operating overlap. The valve seat (10) formed in a valve housing (1) between the inlet (2) and outlet (3), pref. provides a surface, against which the sealing face (9) of a valve plunger (6) works.