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Hydraulic Accumulators

Your complete solution for hydraulic accumulators

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Bosch Rexroth hydraulic accumulators save energy and improve manufacturing efficiency by using the accumulator as a storage device to store hydraulic pump output flow when system demand is low and supplement output when demand is high.

Industrial applications:

  • Material Handling
  • Chemical Industry
  • Energy Technology
  • Machine Tools and Presses
  • Marine
  • Metallurgy
  • Mineral Processing
  • Mining
  • Oil and Gas Drilling (land based)
  • Plastic Machinery and Die Casting
  • Pulp and Paper Machinery
  • Recycling and Waste Handling
  • Rubber Processing
  • Tunnel Boring Machines
  • Logging & Sawmills
  • Automotive

Key benefits:

  • Energy storage in systems with intermittent operation
  • Energy reserve for emergencies
  • Compensation for leakage losses
  • Impact and vibration damping
  • Compensation of flow in the case of changes in pressure and temperature



Explore our varied accumulator product range



Detailed Product Information

  • Applications
    Diaphram Accumulator


    Hydro-pneumatic accumulators can be used in a wide variety of


    • Energy storage for saving pump drive power in systems with intermittent operation.
    • Energy reserve for emergency cases, e.g. in the event of a hydraulic pump failure.
    • Compensation for losses due to leakage.
    • Impact and vibration damping in the case of periodic oscillations.
    • Volume compensation in case of changes in pressure and temperature.
    • Suspension element on vehicles.
    • Shock absorption in the case of mechanical impact.

  • Features: Bladder
    Features - Bladder Accumulators

    Features - Bladder Accumulators:

    The HAB design is a hydro-pneumatic type accumulator with compressed nitrogen separated from hydraulic fluid by means of an elastomeric bladder. The current generation of bladder accumulators from Bosch Rexroth carries the HAB-6X and HAB-7X designations. The HAB product line is available in many different configurations needed to meet the stringent demands of today’s market.

    • Hydraulic accumulator according to ASME Section VIII pressure vessel code
    • CRN certificate possible (not all sizes, consult factory)
    • Bladder materials for different applications
    • Two piece gas valve design on 2.5 gallon and larger units for improved serviceability

  • Features: Diaphragm
    Features - Diaphram Accumulators

    Features of Diaphragm Accumulators:

    The HAD design is a hydro-pneumatic type accumulator that utilizes compressed nitrogen to supply fluid to the hydraulic system. The nitrogen and hydraulic fluid are separated by means of an elastomeric membrane. HAD units are the diaphragm welded non-repairable type that can be supplied in both non-rechargeable and chargeable versions.

    • Hydraulic accumulator according to Pressure Equipment Directive 97/23/EC
    • HAD sizes range from 0.075L to 3.5L
    • HAD pressure rating 250 bar on most sizes, with special options available up to 350 bar.
    • HAD units are economical solutions for pulsation dampening and energy storage applications where only a small volume of usable fluid is required.
    • Very compact design allows for the use of the HAD product in the smallest of locations, industrial or mobile hydraulic in nature.
    • Multiple elastomer options for many different fluid and temperature driven applications.
    • Multiple fluid port options are available such as UNF, NPT, BSPP, and metric M threaded designs.
    • Two gas valve options are available for pre-charging, the standard Schrader valve type common for the US market (7/8”-14UNF connection) and the European standard M28 threaded connection.
  • Features: Stations & Safety Blocks

    Features of Accumulator Stations and Safety Blocks:

    Accumulator stations are intended for use in hydraulic systems and consist of a diaphragm or bladder-type accumulator with shut-off block on mounting elements.

    Rexroth ABZSS safety blocks can be used in any system that incorporates a hydraulic accumulator. Safety blocks not only perform safety functions such as pressure relief, unloading and isolation, but also provide a mounting base for accumulator installation and a quick means to access system pressure readings.

    • Sizes 08 to 30
    • Safety block design per DIN 24552
    • Pressure relief valves can be PED type approved (CE)
    • NBR (buna) and FKM (viton) seal options
    • Discharge valve can be either manually or electronically actuated
    • Pressure relief valve for safety purposes
    • Discharge valve can drain accumulator pressure for system shut down
    • Ball valve can isolate accumulator pressure from circuit
    • Optional lock-out version possible