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The structure of high-pressure accumulator

High-pressure accumulators are devices used in hydraulic systems to store energy in the form of pressurized fluid. They are essential components in various industrial and automotive applications, providing functions such as energy storage, shock absorption, and maintaining system pressure. The structure of a high-pressure accumulator typically includes the following key components:

  1. Pressure Vessel (Accumulator Shell):
    • The main body of the accumulator, designed to withstand high internal pressures.
    • Made from materials like steel or composite materials for durability and strength.
    • The shell can be cylindrical or spherical in shape.
  2. Bladder or Diaphragm:
    • Located inside the pressure vessel, it separates the hydraulic fluid from the compressible gas.
    • Made of flexible, durable materials such as rubber or elastomers.
    • In bladder accumulators, the bladder is a balloon-like component that inflates and deflates with the fluid’s pressure changes.
    • In diaphragm accumulators, a flexible diaphragm serves the same purpose.
  3. Gas Pre-Charge Port:
    • A valve or fitting that allows the accumulator to be pre-charged with gas, typically nitrogen.
    • The gas pre-charge creates the initial pressure in the accumulator and is a critical factor in its operation.
  4. Fluid Port:
    • The connection point for the hydraulic fluid to enter and exit the accumulator.
    • Equipped with check valves or other control mechanisms to manage fluid flow.
  5. End Caps or Flanges:
    • Securely close the ends of the accumulator shell.
    • Provide structural integrity and prevent leaks.
  6. Safety Devices:
    • Pressure relief valves or burst discs to prevent over-pressurization and ensure safe operation.
    • These components protect the system and personnel from potential failures.

Types of High-Pressure Accumulators

Bladder Accumulators:

  • Consist of a bladder within the pressure vessel.
  • Hydraulic fluid compresses the bladder, storing energy.
  • Bladders are replaceable, making maintenance relatively easy.

Diaphragm Accumulators:

  • Utilize a diaphragm to separate the gas and fluid.
  • Generally have smaller fluid capacities compared to bladder accumulators.
  • Compact and often used in smaller systems.

Piston Accumulators:

  • A piston separates the gas and hydraulic fluid within the vessel.
  • Suitable for very high-pressure applications.
  • The piston design allows for a larger volume of fluid storage and precise control of pressure.

Working Principle

The accumulator operates by using the compressibility of gas (typically nitrogen) to store energy. When the hydraulic system exerts pressure on the fluid, the fluid enters the accumulator, compressing the gas. This stores energy in the compressed gas. When the system pressure drops, the compressed gas expands, forcing the fluid back into the system, thus releasing the stored energy.


  • Energy Storage: Storing hydraulic energy during low-demand periods and releasing it when needed.
  • Shock Absorption: Damping system shocks and vibrations to protect components and improve performance.
  • Maintaining Pressure: Providing a consistent pressure supply in hydraulic circuits.
  • Emergency Power: Supplying hydraulic energy during power failures or system malfunctions.

Understanding the structure and operation of high-pressure accumulators is crucial for their effective application and maintenance in hydraulic systems. Proper selection and maintenance ensure reliability and safety in their various industrial roles.



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