Hydac SBO Diaphragm Accumulators

​Diaphragm accumulators are a cost effective option for numerous functions involving energy storage, shock absorption or pulsation dampening in a hydraulic or fluid system. They are well suited for applications where smaller fluid volumes and flow rates are adequate and that require or involve:
Compact design
Low weight
Flexible mounting positions
Extremely quick shock response
Low cost
Low lubricity fluids, like water
Diaphragm Accumulators have been successfully applied in both industrial and mobile applications for energy storage, maintaining pressure, leakage compensation, and vehicle hydraulic systems.
HYDAC manufactures two types of diaphragm accumulators:
Non-repairable (welded)
Repairable (threaded)
​Diaphragm Materials
Not all fluids are compatible with every elastomer at all temperatures, therefore, HYDAC offers the following materials:
NBR (Standard Nitrile)
LT-NBR (Low Temperature Nitrile)
ECO 30 (Epichlorohydrin)
IIR (Butyl)
FPM (Fluorelastomer)
others (available upon request)
To determine which material is appropriate, always refer to fluid manufacturer’s recommendation.
Corrosion Protection
For use with certain aggressive or corrosive fluids, or in a corrosive enviroment, HYDAC offers protective coatings and corrosive resistant materials (i.e. stainless steel) for the parts that interface with the fluid or are exposed to the hostile enviroment.
Mounting Position
Diaphragm accumulators are designed to mount in any position. In systems where contamination is a problem, we recommend a vertical mount with the fluid port oriented downward.
System Mounting
HYDAC diaphragm accumulators are designed to be screwed directly onto the system. We also recommend the use of our mounting components, (detailed on page 84) to minimize the risk of failure due to system vibrations
​Some common applications of diaphragm accumulators are:
Agricultural Machinery & Equipment
Forestry Equipment
Machine Tools
Mining Machinery & Equipment
Mobile & Construction Equipment
Off-Road Equipment
For specific examples of applications using diaphragm accumulators, please see page 89.
Construction
Both types of diaphragm accumulators have the same basic construction. The difference is in the shell. The welded version has a shell that is electron-beam welded, and therefore cannot be repaired. The threaded type has a shell made up of two halves (top and bottom) which are held together by a threaded locking ring.