Full definition
Pressure vessel storing hydraulic energy using compressed nitrogen gas (pre-charge). Functions: dampen pressure pulsations, compensate internal leakage, supply peak flow (10-20× pump flow for seconds), water-hammer dampening. Types: bladder (fast response), piston (large volumes up to 500 L), diaphragm (small volumes). Nitrogen pre-charge: 60-90% of minimum circuit pressure. Standards: PED 2014/68/EU, ASME Section VIII. Brands: Hydac, Parker, Bosch Rexroth, Olaer.