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The structure of high-pressure accumulator

High-pressure accumulators are crucial components in hydraulic systems, storing pressurized fluid or gas to provide supplementary power when needed. Their structure typically consists of several key elements:

  1. Pressure Vessel:
    • This is the main body of the accumulator, typically constructed from high-strength materials like steel or aluminum to withstand the high pressures involved.
    • The pressure vessel is designed to contain the pressurized fluid or gas safely.
  2. Fluid Chamber:
    • High-pressure accumulators store hydraulic fluid under pressure. This chamber holds the fluid until it’s needed to supplement the system.
    • The fluid chamber is connected to the hydraulic system through inlet and outlet ports.
  3. Gas Chamber:
    • In some designs, the gas chamber is separated from the fluid chamber by a flexible barrier like a diaphragm or bladder.
    • The gas chamber is pre-charged with a compressed gas, typically nitrogen. This pre-charge provides the necessary pressure for fluid storage and release.
  4. Separator:
    • This component separates the gas and fluid chambers, ensuring that they don’t mix.
    • In bladder-type accumulators, a flexible bladder expands and contracts to accommodate changes in fluid volume.
    • Piston-type accumulators use a movable piston to separate the gas and fluid.
  5. Valves:
    • Accumulators include valves for controlling fluid flow into and out of the accumulator.
    • Inlet valve: Controls fluid entry into the accumulator.
    • Outlet valve: Regulates fluid discharge from the accumulator.
    • Safety valve: Prevents over-pressurization of the accumulator, ensuring safe operation.
  6. Mounting and Connection Points:
    • Accumulators are typically mounted securely within the hydraulic system, often with brackets or flanges.
    • Connection points allow for easy integration into the hydraulic circuit.
  7. Seals and O-Rings:
    • Seals are essential to prevent leakage of fluid or gas from the accumulator.
    • O-rings are commonly used to create a tight seal between moving components.

Working Principle:

  • During the hydraulic system’s operation, the accumulator stores energy by compressing the gas in the gas chamber.
  • When there’s a sudden demand for hydraulic power, such as during a peak load or rapid movement of actuators, the pressurized fluid from the accumulator is released into the system, supplementing the flow from the pump.
  • This helps maintain system pressure, smooth out pressure fluctuations, and provide additional power as needed.


High-pressure accumulators find applications in various industries and systems, including:

  • Hydraulic machinery and equipment
  • Mobile hydraulic systems, such as construction equipment and agricultural machinery
  • Industrial processes requiring high-pressure fluid power
  • Energy storage systems, including regenerative braking in vehicles


Regular maintenance is crucial to ensure the reliable operation of high-pressure accumulators:

  • Inspection of seals and connections for leaks
  • Checking and maintaining proper pre-charge pressure in the gas chamber
  • Periodic testing of safety valves to ensure they function correctly
  • Monitoring overall accumulator performance to detect any signs of wear or malfunction early

By following proper maintenance procedures, the longevity and efficiency of high-pressure accumulators can be maximized, contributing to the overall reliability of hydraulic systems.



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