Diaphram image

Diaphragm

Eaton diaphragm accumulators utilize the compressibility of a gas (nitrogen) in storing hydraulic energy. The gas is required because fluids are practically incompressible and thus, cannot store energy by themselves. The diaphragm is utilized to separate the gas and the fluid sides of the accumulator. The diaphragm accumulator functions by drawing in fluid from the hydraulic circuit when the pressure increases and thus, compresses the gas. It returns this energy to the circuit as the pressure decreases by the expansion of the gas. A poppet is incorporated into the diaphragm to prevent its extrusion through the fluid port. Eaton diaphragm accumulators have been successfully applied to both industrial and mobile applications for energy storage, maintaining pressure, leakage compensation, and vehicle hydraulic systems (e.g. brake and suspension).

Diaphragm Materials

Not all fluids are compatible with every elastomer at all temperatures.
Therefore, EATON offers the following choice of elastomers:

  • BN - Buna-N (nitrile)
    (5º-180ºF using mineral oil)
  • VT - Fluorocarbon (viton)
    (5º-300ºF)
  • BL - Butyl (-40º-200ºF)
  • CW - Special nitrile blend for low temperature applications
    (-40°F to 180°F)
  • HL - Hydrin for applications requiring extremely low permeation.

To determine which material is appropriate...ALWAYS REFER TO FLUID MANUFACTURER'S RECOMMENDATION. Viton is a registered trademark of Dupont.

Corrosion Protection

For use with certain aggressive or corrosive fluids, or in a corrosive environment, Eaton offers protective coatings and corrosive resistant materials (i.e. stainless steel) for the accumulator parts that come in contact with the fluid, or are exposed to the hostile environment.
 

Mounting Position

Diaphragm accumulators by design may be mounted in any position. In systems where contamination is a problem, we recommend a vertical mount with fluid port oriented downward.
 

System Mounting

Eaton diaphragm accumulators are designed to be screwed directly onto the system. We also recommend the use of our mounting components, which are detailed on page 21, to minimize risk of failure due to system vibrations.


Construction

Eaton diaphragm accumulators are electron-beam welded and contain a flexible diaphragm that separates the gas and fluid sides.

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Applications

Some common applications of diaphragm accumulators are:

  • Agricultural Machinery & Equipment
  • Forestry Equipment
  • Machine Tools
  • Mining Machinery & Equipment
  • Mobile & Construction Equipment
  • Off-road Equipment