Hydraulic Accumulators and Accessories
Energy, safety and reliability in hydraulic systems
Hydraulic accumulators are essential components in hydraulic circuits: they store energy in the form of pressurised fluid, stabilise pressure, compensate for flow variations and ensure operational continuity even under critical conditions. Thanks to their ability to reduce water hammer and optimise energy efficiency, they are used in industrial machinery, mobile systems and safety systems.
Fluid System is an authorised distributor of EPE Italiana, a brand recognised for the quality of its diaphragm, piston and bladder accumulators, designed to offer maximum robustness, reliability and compliance with international standards. EPE products are distinguished by high-grade materials, manufacturing precision and customisable solutions for every system requirement.
Comparison of the different types of EPE Italiana Hydraulic Accumulators and Accessories
| Type | Main function | Max pressure | Max capacity | Certifications | Typical applications |
|---|---|---|---|---|---|
| Bladder Accumulators | Energy storage and volume compensation | 360 bar (60 bar for low-pressure versions / 16 bar for the ASE series) | up to 1000 L (ASE versions up to 5000 L on request) | PED / ASME / EAC | Industrial systems - mobile systems |
| Piston Accumulators | High-flow fluid-gas separation | 375 bar standard (up to 2000 bar on request) | up to 1000 L | PED / EAC | Dynamic applications - test systems |
| Diaphragm Accumulators | Rapid compensation in limited spaces | 330 bar for the AM series / 350 bar for the AML and AMS series | up to 2.5 L | PED / EAC | Compact machinery - mobile vehicles |
| Additional Bottles | Increase in circuit fluid volume | up to 375 bar | up to 1000 L | PED / EAC | Complex circuits - systems with multiple accumulators |
| Safety Blocks | Accumulator isolation and protection | up to 420 bar | - | PED / EAC | Safe maintenance - overpressure protection |
| Safety Valves | System pressure limitation | DN6 DN20 up to 400 bar / DN10 up to 630 bar / DN30 30-315 bar | - | PED / EAC | Protection of hydraulic lines - components |
| Gas-side Safety Accessories | Gas pressure protection and management | up to 400 bar (320 bar for ball valves) | - | PED / EAC | Gas side of accumulators - bottles |
| Fluid-side Safety Accessories | Oil-side pressure management | up to 400 bar | - | PED / EAC | Pressure lines - return lines |
| Pre-charging Kits | Nitrogen checking and charging | up to 600 bar PC / 400 bar PCM | - | - | Accumulator maintenance |
| Mobile Nitrogen Charging Unit | On-site nitrogen charging | 350 bar | - | - | Maintenance - on-site service |
| Accumulator Stations | Integration of multiple accumulators | up to 315 bar | up to 50 L per single unit | PED / EAC | Centralised industrial systems |
| Mounting and Accessories | Component support and stabilisation | - | - | - | Industrial installations - mobile installations |
Bladder Accumulators
Bladder hydraulic accumulators designed to store energy, compensate for volume variations and absorb pressure peaks. Available in standard, low-pressure, large-volume, ASME U-Stamp and liquid-separation or fluid-transfer versions.
TECHNICAL FEATURES
Capacity: 0.2-55 litres (up to 1000 L; ASE versions up to 5000 L on request).
Max pressure: 360 bar standard – 60 bar for low-pressure versions – 16 bar for the ASE large-volume series.
Operating temperature: -20 to +80 °C with NBR – -40 to +150 °C with FKM or HNBR – ASE series -30 to +100 °C.
Fluid connections: threaded or flanged SAE / BSP.
NBR, FKM, EPDM seals.
PED, ASME, EAC certifications.
Main applications
- Industrial hydraulic power units.
- Machine tools and presses.
- Mobile and agricultural systems.
- Circuits with flow or pressure variations.
Bladder Accumulators available for prompt delivery
AS series
Standard bladder hydraulic accumulators from 0.2 to 55 litres. Max pressure 360 bar, for volume compensation and pressure-peak absorption.
Special Bladder Accumulators available on request
ASL / AST / ASB / ASBL / ASBT / ASA / ASE series
Bladder accumulators for low pressures, large volumes or liquid-gas separation. Versions for industrial systems, marine installations and fluid-transfer systems.
Piston Accumulators
Accumulators with highly efficient fluid-gas separation, ideal for high flow rates and controlled dynamic response.
TECHNICAL FEATURES
Capacity: up to 1000 litres.
Max pressure: up to 375 bar (standard) / up to 2000 bar on request.
Operating temperature: -60 to +150 °C (depending on sealing materials).
NBR or polyurethane seals.
PED, EAC certifications.
Main applications
- Test systems and industrial machinery.
- Energy systems and marine applications.
Piston Accumulators available to order
AP series
Piston accumulators with fluid-gas separation for high flow rates and dynamic control. Available up to 1000 litres with standard pressure up to 375 bar and up to 2000 bar on request.
Diaphragm Accumulators
Compact diaphragm accumulators with screwed (AM), forged (AML) or welded (AMS) diaphragm, ideal for limited space and frequent cycles.
TECHNICAL FEATURES
Capacity: 0.05-2.5 litres.
Max pressure: 330 bar for the AM series – 350 bar for the AML and AMS series.
Operating temperature: -40 to +150 °C (AM, AML) / -40 to +80 °C (AMS).
NBR, FKM or EPDM seals.
Gas connections M28x1.5 or 5/8″ UNF.
Main applications
- Mobile systems and compact machinery.
- Lubrication and compensation circuits.
Diaphragm Accumulators available to order
AM / AML / AMS series
Compact accumulators with screwed, forged or welded diaphragm. Ideal for mobile applications and limited installation space.
Additional Bottles
Supplementary reservoirs (AB, ASS, ASSA series) designed to increase fluid volume in the hydraulic circuit, maintaining stable pressure and reducing pulsations.
TECHNICAL FEATURES
Capacity: up to 1000 litres (AB series) / 55 L (ASS) / 75 L (B).
Max pressure: up to 375 bar.
Materials: carbon steel / stainless steel.
Main applications
- Complex circuits with multiple accumulators.
- Systems with high volume requirements.
Additional Bottles available to order
B / AB / ASS / ASSA series
Supplementary reservoirs to increase fluid volume and stabilise pressure. Useful in circuits with multiple accumulators or high flow rates.
Safety Blocks
PED-compliant hydraulic blocks for accumulator isolation and protection, either manual or with 24 VDC electric actuation (B10, B20, BS series).
TECHNICAL FEATURES
Max operating pressure: up to 420 bar.
Fluid connections: BSP / SAE / flanged.
PED, EAC certifications.
Main applications
- Power units and industrial systems.
- Circuits with multiple accumulators.
Safety Blocks available available to order
B10 / B20 / BS series
PED-compliant hydraulic blocks for accumulator isolation and protection. Manual versions or with 24 V DC electric actuator for remote control.
Safety Valves
Direct-acting or seat-type cartridge valves (DBDS, VS series) for limiting operating pressure and protecting against overpressure.
TECHNICAL FEATURES
DBDS set pressure by size: DN6 and DN20 up to 400 bar; DN10 up to 630 bar; DN30 30-315.
Max pressure for the VS series: up to 360 bar.
Flow rate: up to 200 L/min.
PED, EAC certifications.
Main applications
- Protection for accumulators and safety blocks.
- Hydraulic power units and pressure lines.
Safety Valves available for prompt delivery
DBDS series
Direct-acting or seat-type cartridge valves for system pressure limitation. Standard setting 100-315 bar – other settings available depending on size.
Safety Valves available on request
VS series
Flat-seat safety valves for industrial systems and accumulator units. Available for pressures up to 360 bar.
Gas-side Safety Accessories
Components for gas-side management and safety: adaptors (TG), 2-way and 3-way ball valves, rupture discs (DR, DF).
TECHNICAL FEATURES
Max pressure: up to 400 bar (320 bar for 2-way and 3-way ball valves).
Materials: steel, brass, stainless steel.
Main applications
- Gas charging and discharge systems.
- Protection for accumulators and bottles.
Gas-side Safety Accessories available to order
TG / DR / DF / VS series
Adaptors, 2-way and 3-way ball valves, rupture discs and fusible plugs for gas-side protection. Manufactured in steel, brass or stainless steel, up to 350 bar.
Fluid-side Safety Accessories
Adaptors, discharge valves and relief blocks (TF, BPV, BAPV) for oil-side pressure management.
TECHNICAL FEATURES
Max pressure: up to 400 bar depending on configuration.
Threaded or flanged connections.
PED, EAC certifications.
Main applications
- Pressure and return lines.
- Fluid safety systems.
Fluid-side Safety Accessories available to order
TF / BPV / BAPV series
Adapters, discharge valves and relief blocks for oil-side pressure management. BSP / SAE connections, PED and EAC certifications.
Pre-charging Kits
Type C nitrogen pre-charging kits (PC / PCM series) for accumulator pressure checking, pre-charge adjustment and inflation. Complete with pressure gauge, bleed valve, 3 m hose and connections for high-pressure cylinders.
TECHNICAL FEATURES
Working pressure: up to 600 bar (PC) / 400 bar (PCM).
Pre-charge valve connections: 5/8″ UNF (PC series), M28x1.5 (PCM series).
Rigid carrying case.
Main applications
- Accumulator maintenance.
- Pressure charging and adjustment.
Pre-charging Kits available for prompt delivery
PC / PCM series
Nitrogen pre-charging kits complete with pressure gauge, bleed valve and 3 m hose. Supplied in a rigid carrying case for accumulator maintenance and pre-charge adjustment.
Mobile Nitrogen Charging Units available to order
CCA 9-350 series
Mobile unit for on-site nitrogen charging and pressure checking. Max pressure 350 bar, operating temperature -20 to +80 °C. Supplied on a trolley with pressure gauges, regulator and high-pressure hoses.
Accumulator Stations
Single units (BA1S) or pre-assembled multiple stations (BA), with integrated safety blocks and provision for manifolds.
TECHNICAL FEATURES
Pressure: up to 315 bar.
Configurations: 1-6 accumulators.
PED, EAC certifications.
Main applications
- Hydraulic power units and complex systems.
Accumulator Stations available to order
BA / BA1S series
Single units or pre-assembled multiple stations with integrated safety blocks.
Configurations from 1 to 6 accumulators, PED-compliant.
Mounting and Accessories
C-type clamps, MA brackets, U-bolts and retaining rings for safe, stable installation.
TECHNICAL FEATURES
Supported diameters: 60-250 mm.
Materials: galvanised steel, stainless steel, reinforced plastic.
Main applications
- Accumulator installation and maintenance.
Mounting Components available for prompt delivery
C / MA / U / P series
Clamps, brackets, supports and saddles for safe, stable accumulator mounting. Vibration damping and compatibility with different accumulator sizes.
Why choose the hydraulic accumulators supplied by Fluid System
– A single technical and commercial partner for EPE Italiana accumulators, blocks and accessories.
– Wide availability of standard products and PED-, ASME- and EAC-certified versions.
– Specialised technical support for sizing, pre-charging and maintenance.
– Fast supply from stock, plus genuine spare parts.
– Full integration with hydraulic power units and systems designed by Fluid System.
Do you need hydraulic accumulators?
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Our technical team is available to help you select the EPE Italiana accumulator best suited to your application, together with the most appropriate safety or maintenance accessories.
Contact us for technical advice or a tailored quotation.
FAQ - Hydraulic Accumulators
It is used to store energy in the form of pressure, compensate for volume variations and absorb pressure peaks, improving system stability and efficiency.
The bladder accumulator is the most common and versatile; the piston version offers greater dynamic control; the diaphragm version is compact and suitable for limited spaces.
Using nitrogen pre-charging kits, adjusting the pre-charge pressure according to system operating conditions.
Safety blocks, safety valves, mounting components, and gas-side and fluid-side accessories for a complete and safe installation.
Yes, all major EPE Italiana models comply with the PED Directive and are also available with ASME or EAC certifications.
