Entering our 10th year of being a Bosch Rexroth’s approved sales partner, Leader Hydraulics and Bosch Rexroth have seen continuous growth in the Hydraulic accumulator division year on year. With Bosch Rexroth establishing itself as one of the industries leading specialists, it is easy to see how our relationship continues to flourish.

As part of an on going feature we’ll be looking into Bosch Rexroth’s accumulator ranges.


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
  • Bladder materials for different applications
  • Two piece gas valve design on 2.5 gallon and larger units for improved serviceability

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.

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