Bladder accumulators
HYDAC bladder accumulators are pressure vessels equipped with a flexible elastomer bladder that strictly separates the gaseous nitrogen cushion and the hydraulic operating fluid. Unlike piston accumulators, they provide separation with extremely low inertia, which enables excellent response characteristics in the case of high-frequency pressure changes. This makes them the perfect solution for storing energy in systems with rapid work cycles and for effectively damping pulsations in pump circuits. The bladder accumulator is also generally resistant to contaminations in the operating fluid.
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Variants and specifications
| Bladder accumulator series | Technical features | Target application |
| Standard (SB330) | Up to 330 bar, seamless forged body | General mechanical engineering, machine tools |
| Low pressure (SB16, SB35HB, SB40) | Large volumes (up to 450 litres), welded housing | Water hydraulics, chemistry, lubrication plants |
| High pressure (SB690) | Pressure ranges up to 690 bar and more | High pressure applications in offshore, oil & gas |
| Repairable version | Bladder can easily be replaced | Maintenance-intensive plants, process industry |
Technical superiority in application
A key advantage of HYDAC bladder accumulators is their structural safety: the fluid-side valve is designed to mechanically prevent the bladder from leaking into the hydraulic line in the event of a sudden drop in pressure. By selecting specific elastomer mixtures for the bladder, e.g. NBR, ECO, IIR (butyl) or FKM, the storage units can be optimally adapted to the medium used (e.g. chemically aggressive liquids) and the temperature range (low temperatures, sometimes even below -50°C). This not only ensures functionality but also minimises the risk of unplanned downtime caused by maintenance work on the bladder accumulator.
Engineering support and durability
The service life of a bladder accumulator depends largely on the correct pre-charge pressure (P0). To avoid duplicating content, we will link specifically to our maintenance tools here, such as the charging and testing unit FPU-1. Engineers benefit from our global certification matrix, which ensures that the selected bladder accumulators meet international approvals such as RL2014/68/EU, ASME or SELO, as pressure equipment such as hydraulic accumulators can only be exported with worldwide certification: this simplifies the international trading of your machines and plants.
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