Parking brake valve for commercial vehicle, has deaerating valve seat, which is closed by deaerating operating output, so that operating pressure is adjusted at operating output, where operating pressure depends on control pressure

摘要

The valve (10) has a pneumatic auxiliary control input (30) connected with a control chamber (16). An auxiliary control piston (32) is movable such that an aerating valve seat (26) closes and a deaerating valve seat (28) opens by aerating the auxiliary control chamber based on the condition of the aerated control chamber. The deaerating valve seat is closed by deaerating an operating output (20), such that operating pressure is adjusted at the operating output, where the operating pressure depends on the control pressure that is fed to the auxiliary control input.