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The structure of high-pressure accumulator

High-pressure accumulators are vital components in hydraulic systems, storing energy in the form of pressurized fluid or gas. Their structure typically consists of several essential elements:

  1. Pressure Vessel:
    • The main body of the accumulator, often cylindrical or spherical, designed to withstand high pressures.
    • Constructed from robust materials like steel, stainless steel, or aluminum alloys.
    • Provides containment for the fluid and gas chambers and ensures structural integrity.
  2. Fluid Chamber:
    • Contains hydraulic fluid under high pressure.
    • Connected to the hydraulic system through inlet and outlet ports.
    • When fluid is pumped into the accumulator, it compresses the gas in the gas chamber, storing energy.
  3. Gas Chamber:
    • Separated from the fluid chamber by a flexible barrier like a bladder, piston, or diaphragm.
    • Pre-charged with a compressed gas, typically nitrogen, to a specific pressure.
    • As fluid enters the accumulator, it compresses the gas, storing potential energy.
  4. Separator:
    • A flexible barrier that separates the gas and fluid chambers while allowing energy transfer between them.
    • Types of separators include bladder, piston, and diaphragm.
    • In bladder-type accumulators, a flexible bladder expands and contracts with changes in fluid volume, while piston-type accumulators utilize a movable piston to separate the chambers.
  5. Valves:
    • Inlet Valve: Controls fluid entry into the accumulator.
    • Outlet Valve: Regulates the release of pressurized fluid from the accumulator into the hydraulic system.
    • Safety Valve: Prevents over-pressurization by releasing excess pressure, ensuring safe operation.
  6. Mounting and Connection Points:
    • Accumulators are typically securely mounted within the hydraulic system using brackets or flanges.
    • Connection points facilitate integration into the hydraulic circuit, enabling fluid flow into and out of the accumulator.
  7. Seals and O-Rings:
    • Essential for maintaining the integrity of the accumulator, preventing fluid or gas leakage.
    • O-rings ensure a tight seal between moving components, promoting efficient operation and minimizing the risk of fluid loss.

Working Principle:

  • During normal operation, hydraulic fluid is pumped into the accumulator, compressing the gas in the gas chamber and storing energy.
  • When hydraulic pressure drops or there’s a sudden demand for power, pressurized fluid is released from the accumulator into the hydraulic system, supplementing the pump’s flow and maintaining system pressure.
  • This stored energy can be swiftly released to provide additional power for hydraulic actuators or to compensate for fluctuations in system pressure.


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

  • Hydraulic machinery and equipment such as presses, lifts, and industrial robots.
  • Mobile hydraulic systems including construction equipment, agricultural machinery, and material handling vehicles.
  • Energy storage systems like regenerative braking in vehicles and hydraulic accumulators used in renewable energy systems.


Regular maintenance is essential for ensuring the reliable operation of high-pressure accumulators:

  • Inspecting seals and connections for signs of wear or damage.
  • Monitoring and maintaining proper pre-charge pressure in the gas chamber.
  • Testing safety valves to verify correct operation and prevent over-pressurization.
  • Monitoring overall accumulator performance to identify abnormalities or potential issues early on.



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