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The structure of high-pressure accumulator

High-pressure accumulators are critical components in hydraulic systems, designed to store and release energy through the pressurization of a hydraulic fluid. The structure of a high-pressure accumulator typically includes several key elements:

1. Pressure Vessel (Accumulator Shell)

  • Material: High-strength materials such as carbon steel, stainless steel, or composites are used to withstand high internal pressures.
  • Shape: Usually cylindrical or spherical to evenly distribute stress.
  • Function: Encases and protects the internal components, maintaining structural integrity under high pressure.

2. Internal Separator

This component separates the hydraulic fluid from the gas, ensuring that the two do not mix. There are three main types of separators used in accumulators:

  • Bladder:
    • Structure: A balloon-like flexible component made from elastomers.
    • Operation: Expands and contracts with the fluid pressure changes.
    • Advantages: Good for systems requiring rapid response to pressure changes.
  • Diaphragm:
    • Structure: A flexible rubber or elastomer membrane that separates the gas and fluid chambers.
    • Operation: The diaphragm flexes to accommodate changes in fluid volume.
    • Advantages: Simpler design, often used in smaller accumulators.
  • Piston:
    • Structure: A solid piston that moves back and forth within the pressure vessel.
    • Operation: The piston slides within the cylinder, separating the gas and fluid.
    • Advantages: Suitable for very high-pressure applications and larger volumes.

3. Gas Chamber

  • Gas Type: Typically filled with nitrogen gas due to its inert properties and stability under pressure.
  • Function: The compressible gas provides the energy storage capability of the accumulator.

4. Fluid Chamber

  • Function: Holds the hydraulic fluid that enters and exits the accumulator, compressing the gas in the process.

5. Gas Pre-Charge Port

  • Purpose: Used to pre-charge the accumulator with nitrogen gas to a specified pressure.
  • Components: Usually includes a valve or fitting for connecting to a nitrogen supply.

6. Fluid Port

  • Function: The entry and exit point for hydraulic fluid.
  • Design: Often equipped with check valves to control the direction of fluid flow and prevent backflow.

7. End Caps or Flanges

  • Purpose: Securely close the ends of the pressure vessel.
  • Design: Bolted or welded to ensure a strong, leak-proof seal.

8. Safety Devices

  • Pressure Relief Valves: To prevent over-pressurization by releasing excess pressure.
  • Burst Discs: Rupture at a specific pressure to protect the system from excessive pressure.

Working Principle

  1. Pre-Charging: The accumulator is pre-charged with nitrogen gas to a predetermined pressure through the gas pre-charge port.
  2. Energy Storage: Hydraulic fluid enters the fluid chamber, compressing the gas in the gas chamber (either by inflating the bladder, flexing the diaphragm, or moving the piston). This stores energy in the compressed gas.
  3. Energy Release: When system pressure drops, the compressed gas expands, pushing the hydraulic fluid back into the system, thereby releasing the stored energy.


  • Energy Storage: Accumulators store hydraulic energy during periods of low demand and release it when demand is high.
  • Shock Absorption: They dampen shocks and pulsations in hydraulic systems, protecting components and enhancing performance.
  • Pressure Maintenance: Provide a consistent pressure supply in hydraulic circuits to ensure smooth operation.
  • Emergency Power: Supply hydraulic energy during power failures or system malfunctions to ensure continued operation.

Understanding the structure and operation of high-pressure accumulators is crucial for their effective use and maintenance in hydraulic systems, ensuring reliability and safety in various industrial applications.



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