Hydraulic accumulators – are used to store fluids under pressure.

Hydraulic accumulators/membrane accumulators store fluids under pressure and ensure reliable shock and pulsation damping in hydraulic systems. In the Hydromot online shop you will find membrane accumulators with nominal volumes from 0.16 to 2.8 liters, operating pressures up to 330 bar, and a temperature range of -15 °C to +80 °C. Learn more...

 

Diaphragm accumulator 0,16 - 2,8 liter, 330 bar, female thread G1/2
Diaphragm accumulator 0,16 - 2,8 liter, 330 bar, female thread G1/2" - G3/4"
  • Diaphragm accumulator
  • max. pressure range 330 bar
  • Temperature range -15°C to +80°C
  • Connection: female thread G1/2" (up to nominal volume1.4 liter), G3/4" from nominal volume 2 liter
  • Gas connection M28 x 1,5
  • Without gas filling (please tell us on order, max. filling pressure 160 bar)
from 79,32 EUR
67,79 EUR excl. 17% tax
incl. 17% tax excl. Shipping costs
67,79 EUR excl. 17% tax
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Our models are made of robust steel or lightweight aluminum and are equipped with diaphragms made of NBR, EPDM or FKM. Typical connections are G 1/2" or G 3/4" internal threads as well as a gas port M28 x 1.5. The accumulators are suitable for applications in industrial hydraulics, construction machinery, vehicle engineering and process technology. Please note: Delivery is without nitrogen pre-charge; the desired pre-charge pressure up to a maximum of 160 bar can be specified when ordering.

 

Hydraulic accumulators/diaphragm accumulators – Frequently Asked Questions

1. What is a diaphragm accumulator and how does it work?

A diaphragm accumulator is a special type of hydraulic accumulator for energy storage in hydraulic systems. It consists of a pressure vessel in which a flexible diaphragm separates gas (usually nitrogen) and hydraulic fluid. As system pressure rises, the fluid compresses the diaphragm, which compresses the gas and stores energy. As pressure decreases, the gas expands and forces the fluid back into the system.

2. What materials are diaphragm accumulators typically made of?

  • Pressure vessel: Steel for high pressures, aluminum for lightweight design
  • Diaphragm: Elastomers such as NBR, EPDM or FKM – depending on medium and temperature
  • Seals: Chemically resistant elastomers depending on the application

3. What sizes and pressure ranges are common for diaphragm accumulators?

Typical nominal volumes range between approx. 0.07 l and >3.5 l (special sizes possible). Common operating pressures: 100–350 bar. The maximum gas pre-charge pressure is usually up to 160 bar. Example: Nominal volume 0.16–2.8 l, max. pressure 330 bar, pre-charge pressure up to 160 bar.

4. Where are diaphragm accumulators typically used?

  • Industrial hydraulics: shock and pulsation damping, energy buffering
  • Construction machinery & mobile hydraulics: shock/vibration damping, emergency energy storage
  • Automotive engineering: braking, steering
  • Energy, robotics and process technology

5. What are the advantages of diaphragm accumulators?

  • Compact & lightweight: Can be installed in any position
  • Fast response: Effective for peak loads
  • Efficient damping: Reduction of pressure surges and pulsations
  • Low maintenance: Few moving parts
  • Energy storage & recovery: Improves system efficiency

6. How is a diaphragm accumulator installed and maintained?

Installation: Ensure correct alignment of the gas port; depending on design (welded/bolted) comply with the requirements of the Pressure Equipment Directive. Select diaphragm material according to medium and temperature.

Maintenance: Regular visual inspections, mandatory inspections (in the EU often every 10 years). Periodically check/replace diaphragm and seals, check nitrogen pre-charge pressure at defined intervals.

7. What factors influence the service life of a diaphragm accumulator and how can it be optimized?

High-quality diaphragm accumulators typically achieve a service life of 5–10 years – depending on load, diaphragm quality and maintenance. Large pressure fluctuations and exceeding the permissible pressure ratio (often up to approx. 8:1 between working pressure and pre-charge pressure) shorten service life. Correct sizing with regard to volume, pressure range, temperature and media compatibility is crucial.

8. What criteria are important when selecting the right diaphragm accumulator?

  • Function & application: shock absorption, energy storage, pulsation damping
  • Volume & pressure range: including permissible pre-charge pressure
  • Operating temperature & medium: chemical compatibility of diaphragm/seals
  • Installation space & mounting: space requirements, orientation, connection type
  • Regulations: compliance with Pressure Equipment Directive for design and inspection
  • Data basis: manufacturer specifications and exact system requirements for sizing