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Pressure limiting valve (safety valve): Safeguarding the system against excessive pressure or for the limitation of working pressure.
Sequence valves: Generates a constant pressure difference between inlet and outlet of the flow. Directly controlled valves feature a dampening device to ensure quiet operation, but also available without it if necessary for an application. There is also a version of the pressure limiting valve, which features a type approval (TÜV), necessary when they are used as safety valves for accumulators.