SB Series Bladder Accumulators

The bladder accumulator consists 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 thus compressing the gas. When the pressure drops, the compressed gas expands and forces the stored fluid into the circuit.


HYDAC bladder accumulators consist of a welded or forged pressure vessel (shell), a bladder and ports for gas and fluid inlet. The gas and fluid sides are separated by the bladder.

Bladder Materials
Not all fluids are compatible with every elastomer at all temperatures. Therefore, HYDAC offers the following choice of elastomers:
• NBR (Standard Nitrile)
• LT-NBR (Low Temp. Nitrile)
• ECO (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 environment, HYDAC 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
HYDAC bladder accumulators can be installed vertically, at any angle, or horizontally depending upon the application. When installing vertically or at an angle, the fluid port must be at the bottom. On certain applications listed below, specific positions are preferable:
• Energy Storage:
• Pulsation Damping: a
ny position from vertical to horizontal
• Maintaining Constant Pressure:
any position from vertical to horizontal
• Volume Compensation:
any position from vertical to horizontal

System Mounting
bladder accumulators are designed to be screwed directly onto the system. We also recommend the use of our mounting components to minimize risk of failure due to system vibrations.

Some common applications of bladder accumulators are:

• Agricultural Machinery & Equip.
• Forestry Equipment
• Oil Field & Offshore
• Machine Tools
• Mining Machinery & Equipment
• Mobile & Construction Equipment
• Off-Road Equipment