Hydraulic Accumulator

Hydraulic Accumulators

High-performance bladder, piston, and diaphragm accumulators engineered to store energy, dampen pulsations, and absorb shock across critical hydraulic systems — from offshore BOPs to mobile machinery.

6000 PSI
MAX WORKING PRESSURE
0.1–100 gal
VOLUME RANGE
3
CORE TECHNOLOGIES
FIG. 1 · BLADDER ACCUMULATOR — CUTAWAY
WORKING PRINCIPLE

Compressed gas, stored hydraulic energy

A hydraulic accumulator stores energy by compressing an inert gas charge — typically dry nitrogen — behind a separating element. As system pressure rises, fluid enters the accumulator and compresses the gas; when pressure drops, the gas expands and drives stored fluid back into the circuit on demand.

Performance is governed by the pre-charge pressure (P₀), the minimum and maximum working pressures (P₁/P₂), and the gas behavior described by the polytropic relation P·Vⁿ = constant. Correct pre-charge — usually 80–90% of minimum working pressure — is the single most important factor in service life.

FUNCTION 01
Energy Storage
Supplement pump flow for peak demand and reduce installed pump size.
FUNCTION 02
Shock Absorption
Cushion pressure spikes from valve closure and load reversal.
FUNCTION 03
Pulsation Damping
Smooth pump ripple to protect instruments and extend seal life.
FUNCTION 04
Emergency Reserve
Hold fail-safe pressure for clamping, braking, or BOP actuation.
ACCUMULATOR TYPES

Three technologies, three operating envelopes

Bladder Accumulator

RAPID RESPONSE

ADVANTAGES
LIMITATIONS
TYPICAL APPLICATIONS
SPECIFICATION MATRIX

Side-by-side technology comparison

PARAMETER Bladder Piston Diaphragm
Values are representative of standard product ranges. Custom configurations available on request.
SELECTION GUIDE

Which technology fits your circuit?

Choose Bladder if…
You need fast response and high cycle frequency — pulsation damping, shock suppression, and rapid energy release in mobile or press applications under 5000 PSI.
Choose Piston if…
You need high pressure and large volume with full fluid compatibility and position sensing — offshore, energy storage, and heavy industrial duty above 5000 PSI.
Choose Diaphragm if…
You need a compact, low-cost reserve for small volumes — suspensions, HVAC, and light machinery where space and budget outweigh capacity.
WHY ARROW

Storing energy. Ensuring safety.

Certified manufacturing, custom engineering, and global aftermarket support — backed by in-house nitrogen charging, hydrostatic testing, and repair services.

Safety-Certified
ISO 9001, ASME, CRN, CE, GB, AS1210 & CUTR compliant pressure vessels.
Custom Configurations
0.1 to 100+ gallon capacities, port options, and elastomer selection.
Global Support
Nitrogen charging, field testing, recertification, and repair worldwide.
Application Engineering
Pre-charge calculation and sizing support for your duty cycle.
Need help sizing an accumulator?
Send us your working pressures, flow demand, and duty cycle — our engineers will spec it.

Hydraulic Accumulator Sub Categories

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