Electropneumatic valve assembly with self-locking safety valve

An electropneumatic brake system comprising:

• an electropneumatic valve assembly for activating a parking brake function of the electropneumatic brake system of a commercial vehicle;
• said electropneumatic valve assembly including a pilot control unit configured to actuate a pilot control pressure as a function of an electronic parking brake signal and a main valve unit configured to receive the pilot control pressure and to actuate a parking brake pressure at least at one spring-accumulator connection;
• said electropneumatic valve assembly further including a service brake connection for receiving a service brake pressure;
• said electropneumatic valve assembly further including a pneumatically switchable self-holding safety valve disposed upstream of said pilot control unit;
• said pneumatically switchable self-holding safety valve having a safety valve control connection for receiving a safety control pressure and a safety valve holding circuit for receiving a pressure actuated by said pneumatically switchable self-holding safety valve or a pressure derived therefrom;
• said pneumatically switchable self-holding safety valve, by receiving said safety control pressure, is switchable from a venting position, in which said pneumatically switchable self-holding safety valve connects said pilot control unit to a vent, to a supply position, in which said pneumatically switchable self-holding safety valve supplies said pilot control unit with reservoir pressure;
• said pneumatically switchable self-holding safety valve being configured to remain in the supply position or switch to the venting position as a function of said actuated pressure received at said safety valve holding circuit;
• said service brake connection being fluidically connected directly or indirectly to said safety valve control connection;
• a service brake circuit having a brake module configured to provide said service brake pressure;
• and,
• said brake module being fluidically connected to said service brake connection of said electropneumatic valve assembly.