Hydac SB330 Bladder Accumulator | SB330-2.5A1 SB330-50A1 | 330 Bar

The SB330 Series of high-pressure bladder accumulators manufactured by Chengyuan Hydraulic are flagship fluid power components engineered to match the globally recognized engineering benchmarks of Hydac. Functioning as energy storage reservoirs, leakage compensators, and high-frequency thermal/shock dampeners, this series provides critical pressure stabilization across heavy industrial and mobile infrastructure grids. Focusing on the high-demand volumetric configurations specified—SB330-2.5A1/112A-330A (2.5-Liter compact footprint) and SB330-50A1/112A9-330A (50-Liter large-capacity platform)—Chengyuan guarantees 100% original-place interchangeable plug-and-play compatibility in dimensional port geometry and hydro-pneumatic delivery plots. Every carbon steel shell and internal bladder assembly undergoes 100% simulated proof-pressure hydrostatic validation, helium mass spectrometer leak detection, and gas permeation auditing before dispatch, securing uncompromised boundary defense under a continuous 330 bar operational envelope.

Technical Specifications :

• Brand Cross-Reference: Hydac SB330 Series Compatible Matrix

• Target Model Nomenclature: SB330-2.5A1/112A-330A, SB330-50A1/112A9-330A

• Nominal Gas Capacities:

  • SB330-2.5 Variant: 2.5 Liters

  • SB330-50 Variant: 50.0 Liters

• Maximum Rated Working Pressure: 330 bar (33.0 MPa / 4785 psi continuous structural rating)

• Shell Construction Metallurgy: Seamless, single-piece hot-spun forged carbon steel vessel (Certified to global high-pressure vessel standards with anti-corrosion primer coating)

• Bladder Polymer Matrix (Code 112): 1 = NBR (Premium Acrylonitrile Butadiene Rubber optimized for standard mineral oils)

• Fluid Port Interface Formats (A / A9):

  • A Profile: Standard internal thread connection (G 1-1/4 standard BSPP for 2.5L variant)

  • A9 Profile: High-flow SAE split-flange combo configuration with supplementary internal threads (Optimized for 50L variant)

• Gas Charging Valve Configuration: M28x1.5 Hydac standard top-mounted gas valve port (Fully compatible with PC280 charging kits)

• Fluid Operating Thermal Span: -10°C to +80°C (Governed by elastomeric NBR bladder compound limits)

Key Technical Advantages:

• Seamless Monoblock Forged Steel Shell Architecture: The accumulator shell is shaped from premium-purity alloy carbon steel blanks via advanced automated hot-spinning mandrel forging. This eliminates all longitudinal and circumferential weld seams, eradicating weld-zone micro-fractures or stress concentration risks. The structural cross-section easily withstands hydrostatic blast-validation testing approaching 500 bar.

• Low-Permeation High-Flex Elastomeric Bladders: The inner rubber bladder is formulated using a specialized NBR polymer compound subjected to multi-stage vulcanization. This provides an excellent flex fatigue life under severe high-frequency volume expansions and drops while sealing molecular pathways to minimize gas permeation into the oil loop, cutting user nitrogen replenishment intervals in half.

• Integrated Mechanical Poppet Anti-Extrusion Assembly: The fluid intake port is armed with a high-tensile poppet valve back-stopped by a heavy-duty return spring. When the hydraulic system depressurizes completely and the bladder stretches to maximum volume, the poppet valve dynamically seats into the fluid passage, preventing the expanding elastomeric bladder from extruding into the port and tearing.

• Hydrodynamically Optimized Low-$\Delta p$ Interface: The inner profiles of the oil ports are refined using 3D computational fluid dynamics (CFD) to maximize flow metrics. Even during the instantaneous discharge of the 50L accumulator (SB330-50A1) into a high-speed circuit, pressure drop ($\Delta p$) is minimized. This suppresses localized turbulence while optimizing instantaneous fluid propulsion to servo or emergency actuation lines.

Application Areas:

• Heavy Metallurgy & Primary Processing Machinery: Emergency fail-safe valve actuators for blast furnaces, and dynamic pulsation dampeners for steel mill AGC gauge control systems.

• Wind Energy & Renewable Infrastructure: High-pressure energy storage systems for wind turbine yaw brakes and proportional hydraulic pitch control units.

• High-Capacity Machine Tools & Stamping Systems: Auxiliary power supply circuits for heavy hydraulic servo presses and fast forging line grids.

Expert Maintenance Tips:

• Enforce Strict Pre-Charge Pressure ($p_0$) Calibration Prior to Operation: Never attempt to fill an accumulator with oxygen, compressed workshop air, or any reactive gas; use only industrial-grade Nitrogen with a purity of $\ge 99.99\%$. For energy storage setups, pre-charge pressure $p_0$ is normally set to 0.9 times the minimum system working pressure $p_1$ ($p_0 = 0.9 \cdot p_1$). Administer nitrogen slowly to prevent the gas from expanding too rapidly, which can freeze and crack the rubber bladder.

• Always Mount Large Vessels via Dedicated Rigid Safety Support Columns: Because larger units like the 50L accumulator (SB330-50A1) weigh over a hundred kilograms and experience heavy axial reaction forces during dynamic fluid discharge, never suspend the accumulator by its main hydraulic plumbing. Secure the unit vertically with heavy-duty mounting clamps and a structural base support bracket, ensuring the gas charging valve faces directly upward.

• Mandatorily Couple the Circuit with a Dedicated Multi-Function Accumulator Safety Block: High-pressure accumulators act as powerful energy-storage hazards. You must install an all-in-one safety valve block (such as the SAF20 or SAF32 series) containing an isolation valve, safety relief valve, and manual dump mechanism between the accumulator and the main loop. Prior to conducting tool adjustments or system maintenance, fully open the manual dump valve to vent stored fluid back to the reservoir, ensuring the inline pressure gauge reads zero before loosening any hydraulic fittings.