Bladder type hydropneumatic accumulators, International series bottom reparable.

Technical Features:

  • Maximum working pressure (PS): 350/480/690 bar Test Pressure (PT): PS x 1,43 / 1,3 / 1,5
  • Body: forged steel, sand and painted
  • Standard nitrogen valve : 5⁄8” UNF
  • Working temperature (TS): -20°C ÷ +80°C Standard bladder: can be used with mineral oils and non corrosive fluids
  • Installation position: horizontal / vertical (nitrogen valve upward)

Compression ratio:

  • recommended: P2/P0 = 2.5
  • maximum: P2/P0 = 4

Mechanical life: the number of cycles is inversely proportional to the increase of the compression ratio. For pulsation dampener applications, the nitrogen value must be from 60% to 80% of the working pressure also in relation with the type of pump and the working temperature.
Warranty: see dedicated page
Spare parts: see dedicated page
Special execution:

  • Inside and outside epoxy painted as per standard FOX procedure or as project specification
  • Internal lining in different materials
  • Bladders in HNBR, EPDM, FPM
  • Connection with flange SAE 3000 – SAE 6000, ANSI B16.5 or UNI/DIN
  • Special connection on request
  • Execution 480 Bar / 690 Bar
  • Execution with nitrogen/poppet valve in inox
  • Accumulators technically and dimensionally interchangeable with other brands of same type


HB1 - HB1.5 - HB2.5 - HB4.5 - HB6 - HB10 - HB10/2 - HB20 - HB25 - HB35 - HB50

Hydraulic Systems and Components