Metal bellows accumulators

HYDAC metal bellows accumulators are the high-end solution when it comes to hydraulic accumulator technology. Unlike conventional accumulators, these accumulators use metallic bellows as the separation element between nitrogen and hydraulic fluid. This design guarantees zero gas leakage and makes the accumulator maintenance-free across its entire service life. They are the first choice when elastomers (diaphragms or bladders) reach their physical limits because of extreme temperatures or chemically aggressive media.

Performance profile and materials

Feature	Technical advantage	Target application
Hermetic tightness	No gas loss over years, maintenance-free	Aviation, applications with high-cleanliness media, compression of precious gases and hydrogen, inaccessible systems
Temperature resistance	Application range from -65 to over 160 °C	Low-temperature technology, very high ambient temperatures
Chemical resistance	Stainless steel bellows for aggressive media	Chemical industry, medical technology, high-safety applications

Reliability in critical environments

Metal bellows accumulators eliminate the risk of sudden diaphragm breakage or the stick-slip effect in piston accumulators. Since metal bellows are manufactured from stainless steel, unlike conventional separation elements, they are highly media-resistant and have a significantly higher resistance to deterioration. Thanks to their metallic properties, they are also not sensitive to extreme temperature ranges, making them the ideal solution for reliable long-term use in safety-critical applications. The precise production of the bellows geometry ensures defined response characteristics and enables precise pulse damping even for the smallest pressure differences.

Investment security thanks to total cost of ownership

Although metal bellows accumulator have higher initial costs than standard solutions, they pay off by eliminating regular testing and charging intervals and by reducing downtime. HYDAC supplies metal bellows accumulators with comprehensive certifications for highly regulated markets. The compact design allows them to be integrated directly into existing housing structures, making them a technically superior solution for OEM manufacturers who need to guarantee maximum reliability.