Hydac Technology (www.hydacusa.com) has unveiled its bladder accumulators which consist of either forged or welded pressure vessel, the armatures for the fluid-side or gas-side connection and accumulator bladders.
These hydropneumatic accumulators feature a flexible bladder, which serves as the separation element between the operating fluid and the compressible gas cushion. When the pressure increases, the bladder accumulator draws in the fluid around the bladder, compressing the gas. The compressed gas expands when the pressure drops, forcing the stored fluid into the hydraulic circuit.
Hydac bladder accumulators are suitable for various applications, such as in emergency operation, energy storage, leakage compensation and force equilibrium. Other applications such as volume compensation, vehicle suspension, shock absorption and pulsation damping add to the list.
The compact and low-maintenance bladder accumulators offer high discharge velocities and have no pressure differential between the gas side and fluid side.
Realizing that not all fluids are compatible with elastometer at all temperatures, the company also offered several choices, such as NBR (standard nitrile), ECO (epichlorohydrin), LT-NBR (low temperature nitrile), EPR (ethylene propylene), IIR (butyl) and FPM (fluorelastomer).
The accumulator shell can also be fitted with corrosion protection, such as chemical nickel-plating or plastic coating on the inside. Stainless steel accumulators are also available.
The standard bladder accumulators (SB330/400/500/550) features pressure vessel seamlessly manufactured from high tensile steel, hydraulic connection with check valve and flexible bladder with gas valve, while high flow bladder accumulators (SB330H) offer enlarged fluid connection to allow higher flow rates.
Filed Under: Pneumatic Tips