Eaton bladder accumulators consist of a fluid section and a gas section, with the bladder acting as a gas-proof screen. The fluid around the bladder is connected with the hydraulic circuit, so that the bladder accumulator draws in fluid when the pressure increases to compress the gas. When the pressure drops, the compressed gas expands and forces the stored fluid into the circuit.
Buna-N bladders and seals are supplied standard and suitable for most fluid power applications. Various other materials are offered to provide compatibility with a wide range of fluids, working temperatures and permeation requirements.
Bladder accumulators are also available with protective coatings and corrosive resistant materials for accumulator parts that come in contact with certain aggressive or corrosive fluids, or are exposed to a corrosive environment.
Material choices for the bladder accumulators include:
- BN: Buna-N (nitrile) (5º-180ºF using mineral oil)
- VT: Fluorocarbon (Viton) (5º-300ºF)
- BL: Butyl (-40º-200ºF)
- EP: Ethylene Propylene
- CW: Special nitrile blend for low temperature applications (-40ºF to 180ºF)
- HL: Hydrin for applications requiring extremely low permeation
Energy storage applications require vertical mounting while any position from vertical to horizontal is suitable for pulsation damping, maintaining constant pressure and volume compensation.