SB330 HYDAC High Pressure Bladder Accumulator 330Bar

Product Overview

The SB330 Series High Pressure Bladder Accumulators (covering capacities from 4L, 6L, 10L, 20L, 32L to 50L, including code SB330-50A1/112A9-330A) are specialized hydropneumatic components designed for energy storage, shock absorption, and pulsation dampening in high-pressure systems. Manufactured in strict accordance with ISO 22384 standards and HYDAC OEM specifications, this series provides 100% drop-in mechanical, pneumatic, and hydraulic interchangeability. Constructed from high-tensile seamless alloy steel shells and housing high-resilience elastomer bladders (NBR/Viton), the SB330 series supports intense flow discharge and pressure compensation at working pressures up to 330 bar. Every accumulator undergoes 100% hydrostatic proof testing and helium/nitrogen leak detection prior to shipment, guaranteeing a seamless, direct plug-and-play replacement for original HYDAC units in demanding industrial and mobile applications.

Technical Specifications 

• Full Model Code: SB330 Series (Covers SB330-4L, 6L, 10L, 20L, 32L, 50L; Typical Code: SB330-50A1/112A9-330A)

• Nominal Capacities: 4 Liters to 50 Liters

• Max Operating Pressure: 330 bar (33 MPa)

• Pre-charge Gas Medium: Nitrogen gas ($N_2$ only, purity $\ge 99.8\%$)

• Bladder Elastomers: Standard NBR (Nitrile), ECO, or Low-Temp Nitrile options

• Fluid Port Connections: G1/2″ to G2″ BSPP female threads or SAE high-pressure flange interfaces

• Fluid & Temperature Range: Mineral hydraulic oils, -20°C to +80°C (depending on bladder material)

• Net Weight: Approx. 16 kg (4L) to 110 kg (50L)

Key Technical Advantages

• 100% Drop-In HYDAC OEM Interchangeability: Envelope dimensions, gas valve threads, and bottom oil valve port geometries strictly match HYDAC SB330 specifications for instant, modification-free field installation.

• High-Tensile Seamless Alloy Shell: Forged from premium seamless alloy steel tubes (e.g., 34CrMo4) with polished internal surfaces, delivering superior fatigue strength across millions of pressure cycles.

• Seamless Vulcanized Elastomer Bladder: Manufactured using seamless molding technology for low gas permeability and high flexing fatigue resistance, extending pre-charge maintenance intervals.

• 100% Rigorous Hydrostatic & Leak Tested: Every shell is factory-tested at 1.5 times nominal pressure (495 bar) with full helium leak verification to guarantee zero-defect field safety.

Application Areas

• Wind Energy & Power Generation: Wind turbine pitch control accumulators and yaw braking hydraulic power packs.

• Metallurgy & Steel Mills: Rolling mill AGC (Automatic Gauge Control) systems, quick roll changing, and safety emergency retract loops.

• Plastics & Metal Forming Presses: Injection molding fast clamping, die-casting high-speed injection, and hydraulic press auxiliary power.

• Mobile Machinery & Marine: Concrete pump boom dampening, subsea heave compensators, and high-pressure hydraulic power units (HPUs).

Expert Maintenance Tips

• Strict Pre-charge Gas Protocol ($P_0$): NEVER fill accumulators with oxygen or compressed air! Use pure Nitrogen ($N_2$) only. For energy storage, set pre-charge pressure $P_0 \approx 0.9 P_1$ (minimum working pressure); for pulsation dampening, set $P_0 \approx 0.6 \text{ to } 0.75 P_m$ (mean operating pressure).

• Routine Pressure Inspection: Check gas pressure weekly during the first month after installation, and semi-annually thereafter using a standard testing and charging kit (FPU style). Recharge if gas pressure drops by more than 10%.

• Depressurize Hydraulic Fluid Before Service: Always completely relieve all hydraulic fluid pressure from the accumulator circuit before attempting any service, installation, or disassembly.