SB330-20A1/112A-330A HYDAC Bladder Accumulator 330Bar

Product Overview

The SB330-20A1/112A-330A is a core 20-liter model within the SB330 high-pressure bladder accumulator series (which also includes 4L, 6L, 10L, 32L, and 50L capacities). Engineered for energy storage, emergency power supply, shock absorption, and pump pulsation dampening in heavy-duty fluid power systems, this product complies strictly with ISO 22384 and ASME pressure vessel standards. It features 100% drop-in mechanical and hydraulic interchangeability with OEM HYDAC specifications. The accumulator shell is forged from high-tensile seamless alloy steel, housing a highly resilient seamless Nitrile (NBR) rubber bladder. Every accumulator undergoes 100% hydrostatic proof testing and rigorous helium/nitrogen leak detection prior to shipment, ensuring supreme system safety and an extended operational lifespan even under demanding 330 bar applications.

Technical Specifications 

• Full Model Code: SB330-20A1/112A-330A (Series covers SB330 4L to 50L)

• Nominal Volume: 20 Liters

• Max Operating Pressure: 330 bar (33 MPa)

• Pre-charge Gas Medium: Pure Nitrogen Gas (N2, purity >= 99.8%)

• Bladder Material: NBR Nitrile Elastomer (Code 112, high oil and aging resistance)

• Fluid Port Connection: G 2″ (BSPP) female thread or high-pressure flange adaptation

• Fluid & Temperature Range: Mineral hydraulic oils, -15°C to +80°C

• Net Weight: Approx. 48 kg (for 20L model)

Key Technical Advantages

• 100% Drop-In HYDAC Interchangeability: Envelope dimensions, total height, gas valve, and fluid port threads perfectly match OEM specifications, allowing for instant plug-and-play installation using existing clamps and brackets.

• Seamless Forged Steel Shell: Manufactured from premium high-strength carbon alloy steel via warm-forging. The internal walls are treated for corrosion resistance and polished to ensure superior fatigue life over millions of pressure cycles.

• Low-Permeation Seamless Bladder: The one-piece vulcanized bladder provides excellent gas-tightness to prevent nitrogen permeation into the fluid. An integrated anti-extrusion fluid port valve protects the bladder from being pulled out and torn during rapid discharge.

• 100% Rigorous Factory Tested: Every single shell passes a hydrostatic proof test at 1.5 times the nominal pressure (495 bar) along with stringent pneumatic leak tests, ensuring absolute zero-defect delivery.

Application Areas

• Wind & Renewable Energy: Hydraulic pitch control accumulators and yaw brake pressure holding in wind turbines.

• Metallurgy & Heavy Machinery: Pulsation dampening in rolling mill AGC (Automatic Gauge Control) servo systems and energy storage in heavy hydraulic shears.

• Plastics & Die Casting: Supplying instantaneous high flow for high-speed injection and emergency mold-opening power in large clamping cylinders.

• Mobile & Marine Equipment: Boom vibration dampening in concrete pump trucks, subsea heave compensators, and heavy-duty Hydraulic Power Units (HPUs).

Expert Maintenance Tips

• Never Use Oxygen or Compressed Air: Only charge the bladder with industrial pure nitrogen (N2). Charging with oxygen or air under high fluid pressure causes severe explosion hazards due to the diesel effect.

• Pre-charge Pressure (P0) Management: For energy storage applications, set the nitrogen pre-charge pressure (P0) to approximately 90% of the minimum system working pressure (P1). Verify the gas pressure weekly during the first month of operation using a standard charging/testing kit (e.g., FPU), and semi-annually thereafter.

• Depressurize Before Any Maintenance: Always relieve all hydraulic fluid pressure from the accumulator circuit before attempting any disassembly or circuit repair. Safely vent all nitrogen gas from the bladder before removing the gas valve or dismantling the shell.