Hydraulic accumulators – find manufacturers and suppliers

Hydraulic accumulators are central elements in hydraulic systems that store energy in the form of pressurized fluid and release it again when required.

They function in a similar way to an energy store or buffer and make a significant contribution to the efficiency, safety and service life of hydraulic systems.

Below you will find the structure and basic principle of hydraulic accumulators, how they work, an overview of their areas of application as well as their advantages and information on maintenance and safety:

Structure and basic principle of hydraulic accumulators:

Hydraulic accumulators consist of a stable, pressure-resistant container in which a fluid - usually hydraulic oil - and a gas, often nitrogen, are separated from each other. The gas acts as an elastic storage medium: it can be compressed and expands again when the pressure is released. This allows energy peaks to be absorbed and released later.

There are different storage principles depending on the design:

1. Bladder accumulator: An elastic rubber bladder separates gas and oil.
2. Diaphragm accumulator: A diaphragm takes over the separation, often in smaller sizes.
3. Piston accumulator: A movable piston separates the gas and liquid sides, suitable for large volumes and pressures.

How hydraulic accumulators work:

The operating principle is simple:

1. When oil is pumped into the accumulator, it compresses the gas cushion. Energy is stored in the form of the increased gas pressure.
2. When the system needs oil, the gas expands again and pushes the fluid back into the hydraulic circuit.
3. Hydraulic accumulators therefore act as energy accumulators, pressure equalization elements or emergency supplies.

Use and areas of application of hydraulic accumulators:

Hydraulic accumulators are used in almost all areas in which hydraulic systems are operated:

1. Industrial machinery:
Stabilization of hydraulic presses, injection moulding machines or machine tools.

2. Mobile hydraulics:
Used in construction machinery, agricultural machinery or conveyor technology to absorb peak loads or enable additional functions.

3. Energy and plant engineering:
In turbines, wind turbines or power plants to smooth out pressure fluctuations.

4. Vehicle technology:
In commercial vehicles and aircraft for braking energy or emergency power supply.

5. oil and gas industry:
To absorb pressure surges in pipelines or drilling rigs.

Advantages of hydraulic accumulators:

Hydraulic accumulators offer several technical advantages:

• Energy storage: absorption of excess pump power and release when required.
• Pressure stabilization: Absorption of pressure surges and vibrations, which protects lines and components.
• Volume compensation: Compensation of temperature or leakage-related volume fluctuations in the system.
• Power reserve: Supply of actuators when pumps are switched off or overloaded.
• Compactness: Large amounts of energy can be stored in comparatively small units.

Maintenance and safety of hydraulic accumulators:

Hydraulic accumulators are under high pressure and therefore require regular inspection:

• Checking the gas pre-pressure, as a drop reduces the accumulator capacity.
• Check for leaks, especially with diaphragm and bladder accumulators.
• Compliance with safety regulations, as improper operation can be dangerous.
• Use protective valves to prevent overpressure.

Hydraulic accumulators are indispensable components in modern hydraulic systems. They store energy, compensate for pressure fluctuations and increase the safety and efficiency of the overall system. Whether in industrial machines, mobile devices or in energy and vehicle technology - they can be used in a variety of ways and are crucial for reliable and efficient operation.

Here are the most important aspects to look out for when buying hydraulic accumulators:

When purchasing hydraulic accumulators, it is important to precisely match the technical requirements, safety specifications and economic framework conditions. As hydraulic accumulators are central and safety-relevant components in the hydraulic system, careful selection is crucial to ensure efficiency, reliability and durability.

• The first step is to clearly define the area of application. Should the accumulator be used primarily for energy storage, pressure equalization, shock absorption or as an emergency supply?
• The requirements for storage volume, pressure level and reaction speed vary depending on the function.
• In mobile machines, for example, a compact design is important, while stationary systems may require large volumes with stable piston accumulators.
• The choice between bladder, diaphragm or piston accumulators depends heavily on the application:
• Bladder accumulators: robust, versatile and low-maintenance, ideal for many standard applications.
• Diaphragm accumulator: Compact and suitable for smaller volumes, often cost-effective.
• Piston accumulator: Flexible in terms of volume and pressure, suitable for high outputs and large systems.
• Purchasers should not only consider immediate suitability, but also aspects such as maintenance requirements, service life and replacement options.
• Hydraulic accumulators must be precisely adapted to the operating conditions. Important criteria are
• Maximum pressure and operating pressure: The accumulator must be designed for the peak loads in the system.
• Gas pre-pressure: This is decisive for the function and should be adaptable to the respective application.
• Storage volume: Dependent on the amount of energy that needs to be stored or released.
• Oversizing leads to unnecessary costs, while undersizing can lead to malfunctions or system damage.
• As hydraulic accumulators often work with high pressures and varying loads, high-quality materials and precise manufacturing are essential. Buyers should pay attention to:
• The quality of the pressure tank,
• Corrosion protection (especially for outdoor use or aggressive media),
• Tested weld seams and manufacturing tolerances.
• It is also important to check whether the diaphragms, bladders or seals used are compatible with the hydraulic fluid used.
• Hydraulic accumulators are subject to strict legal regulations as they are pressure vessels. The following points are essential when purchasing:
• Compliance with relevant standards such as the Pressure Equipment Directive (PED) or DIN/ISO standards.
• Presence of safety valves, test valves and relief devices.
• Documentation and test certificates for approvals and acceptances.
• In Europe in particular, compliance with the PED is mandatory, which is why suppliers must provide the corresponding declarations of conformity.
• Easy access to maintenance and service is crucial for operational safety. Buyers should pay attention to the following:
• Interchangeability of diaphragms or bladders.
• Availability of spare parts over a long period of time.
• Service offers from the manufacturer, such as maintenance contracts, gas refills or testing services.
• Technical support during commissioning and fault diagnosis.
• In addition to the properties of the storage tank itself, it is important to check how it will be integrated into the existing or planned hydraulic system. Aspects to be considered are
• Connection dimensions and compatibility with pipes and valves.
• Installation position, either upright, horizontal or mobile.
• Necessary additional components such as cylinder charging and monitoring units.
• Space requirements and mounting options.
• A low purchase price is often deceptive if the storage tank incurs high maintenance costs or has a short service life. The following are therefore important:
• Life cycle costs (total cost of ownership).
• Robustness and cycle stability during dynamic operation.
• Energy efficiency through optimum pressure-volume curve.
• In the long term, high-quality accumulators are often the more economical choice, as downtimes and follow-up costs are minimized.

The purchase of hydraulic accumulators requires a holistic consideration of technical, safety-related and economic criteria. The decisive factors are precise design in terms of pressure, volume and type, material and manufacturing quality, compliance with standards and the long-term availability of service and spare parts. Anyone who considers not only the purchase costs but also the entire service life and system integration when making a purchase is investing in the safety, efficiency and reliability of the entire hydraulic system.

Hydraulic accumulators can be purchased from various suppliers. Comprehensive information about manufacturers and suppliers of Hydraulic accumulators from all over the world can be found on Exportpages.