The hydraulic miniature accumulators type AC are available in two sizes. They are used for compensating temperature dependent volume variations, possible losses due to leakage, as source of pressurized oil for emergency actuations, or to dampen oscillations in circuits with pressure difference controlled devices. It is possible to use a version with shut-off valve for applications with a system pressure above 4 x p0 (gas filling pressure). These accumulators may be integrated in differing hydraulic systems e.g. hydraulic clamping systems, in various installation positions by means of a wide range of fittings.