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The fluid around the bladder is connected with the hydraulic circuit, so that the bladder accumulator draws in fluid when the pressure increases thus compressing the gas. When the pressure drops, the compressed gas expands and forces the stored fluid into the circuit.

Bladder Materials
The following bladder materials are readily available. Buna-N bladders and seals are standard and are suitable for most fluid power applications. Other materials are offered to provide compatibility with a wide range of fluids, working temperatures and permeation requirements. Please consult your Eaton representative when special requirements are encountered.

BN - Buna-N (nitrile)(5º-180ºF using mineral oil)

• VT - Fluorocarbon (viton)(5º-300ºF)
• BL - Butyl(-40º-200ºF)• EP - Ethylene Propylene
• CW - Special nitrile blendfor low temperature applications(-40°F to 180°F)
• HL - Hydrin for applications requiring extremely low permeation.