Hydac SBO210 SBO200 Diaphragm Accumulator | SBO210-0.75 SBO200-1

The high-pressure Diaphragm Hydro-Accumulators manufactured by Chengyuan Hydraulic are ultra-compact fluid power storage, shock-dampening, and pressure stabilization modules fully engineered to match global Hydac industrial benchmarks. Widely utilized across modern industrial automation machinery, mobile vehicle pilot handling lines, construction equipment hydraulic brake loops, and heavy suspension setups, this versatile series delivers flawless fluid dynamics. The specialized portfolio covers critical compact high-pressure catalog configurations: including the micro-volume high-pressure arrays SBO210-0.75E1/663A9-210AK and SBO210-0.75E1/112A9-210AB (0.75-Liter capacity), the standard platform SBO200-1E1/112U-200AK (1.0-Liter / 200 bar variant), alongside the mid-range high-adaptability unit SBO210-2E1/112A9-210AK (2.0-Liter capacity). Featuring a high-resilience, fatigue-resistant polymer diaphragm separating precharged Nitrogen gas from the system fluid, these vessels withstand severe cyclical expansions. Every single accumulator undergoes 100% water-jacket hydrostatic burst safety verification, extended nitrogen gas-tight retention checks, and mechanical anti-extrusion valve seating calibrations prior to shipment to ensure matching original prints, delivering proven 100% original-place interchangeable compatibility.

Technical Specifications :

• Core Product Framework: Hydac SBO210 / SBO200 Series Welded & Non-Welded Compact Diaphragm Hydraulic Accumulators

• Model Configurations Supported: SBO210-0.75E1/663A9-210AK / SBO210-0.75E1/112A9-210AB / SBO200-1E1/112U-200AK / SBO210-2E1/112A9-210AK

• Nominal Gas Volumetric Capacities:

  • SBO210-0.75 Profile: Nominal gas volume capacity of 0.75 Liters (0.75 L)

  • SBO200-1 Profile: Nominal gas volume capacity of 1.0 Liter (1.0 L)

  • SBO210-2 Profile: Nominal gas volume capacity of 2.0 Liters (2.0 L)

• Maximum Allowable Working Pressure Rating (MAWP):

  • Series SBO210 Platforms: Rated strictly up to 210 bar (21 MPa / 3045 psi) continuous

  • Series SBO200 Platforms: Rated strictly up to 200 bar (20 MPa / 2900 psi) continuous

• Gas Port Charge Interface (E1): Standard M28×1.5 Hydac gas valve connection profile, supporting universal high-pressure charging apparatus for repeating service.

• Fluid Port Thread Interfaces (A9 / U):

  • Configuration Code A9: Premium metric/G female internal ports (e.g., standard G 1/2 or G 3/4 layouts, match-aligned to integrated manifold blocks)

  • Configuration Code U: Universal British standard (BSP) internal parallel pipe thread configurations

• Elastomer Treatment & Shell Protection Codes (112 / 663 / AK / AB):

  • Code 112 Matrix: Premium NBR (Nitrile) elastomer compound, supporting system oil temperatures from -10°C to +80°C.

  • Code 663 Matrix: Specialized ECO polymer blend, tailored to micro-gaseous migration tracking under extreme arctic conditions (down to -40°C).

  • Suffix AK Protection: Shell internal lining and fluid port junctions are armored with a chemical anti-wear / anti-corrosion coating layer, neutralizing internal condensation moisture damage.

  • Suffix AB Profile: Carbon steel raw finish equipped with a vulcanized center-disc anti-extrusion plate assembly at the base.

Key Technical Advantages:

• Monoblock Hemispherical Steel Welding with Low Thermal Distortion: The outer pressure vessel is formed by cold-pressed structural carbon steel shell halves. These components are joined at the central locking matrix using fully automated friction-welding or high-penetration robotic shield-arc lines. The dense, continuous weld seam contains zero micro-voids, effortlessly tolerating millions of high-frequency expansion/contraction structural strain cycles.

• Low-Permeability Synthesized Membranes for Long-Term Precharge Retention: The internal polymer membranes (112 or 663 compounds) are synthesized with tightly cross-linked polymer structures to minimize molecular porosity. This design limits nitrogen ($N_2$) gas molecule transmission into the oil line, maintaining stable precharge levels and extending the interval between routine machine service checks.

• Near-Zero Mechanical Mass Inertia for Microsecond-Class Shock Mitigation: Unlike piston-driven alternatives that suffer from internal seal friction and mechanical lag, a diaphragm accumulator relies on an ultra-lightweight polymer membrane with virtually zero mass inertia. This configuration allows the vessel to immediately catch and flatten high-frequency pressure ripples and “water hammer” shock vibrations caused by sudden directional valve shifting.

• Integrated Anti-Extrusion Vulcanized Protection Shield: When downstream fluid pressure drops to zero, expanding internal gas forces the diaphragm down into the fluid discharge orifice. To prevent damage, a solid vulcanized metal disc shield at the center of the membrane blocks the port. This limits the membrane’s travel and stops the rubber from extruding into the pipeline under severe differential pressure.

Application Areas:

• Heavy Mobile Excavator & Wheel Loader Pilot Blocks: High-response emergency backup energy reservoirs for piloting main multi-spool hydraulic control manifolds.

• Specialty Vehicle Suspension Ride Cushioning & Braking Grids: Hydraulic surge-absorbing accumulators for mining dump trucks and industrial reach-forklifts, and pressure-holding safety vessels for wet multi-disc wheel brake loops.

• High-Speed Industrial Plant HPUs: Instant fluid compensation, thermal volume contraction damping, and continuous low-consumption clamp force holding for fast-cycling metal stamping presses and CNC shears.

Expert Maintenance Tips:

• Mandatory Nitrogen ($N_2$) Purity Limits and Explosion Safeguards: The gas chamber must be precharged exclusively with industrial-grade Nitrogen gas ($N_2$) matching a minimum purity of $\ge 99.99\%$—never charge with oxygen or compressed shop air. Mixing oxygen with oil vapor under high pressure can trigger severe internal thermal explosions. Precharge levels ($P_0$) must be configured between 60% and 85% of the minimum working system pressure limit.

• Absolute Depressurization Requirement Prior to Mechanical Service: Before wrenching the M28×1.5 charging valve or disconnecting the main fluid ports (A9/U), the trapped hydraulic pressure on the fluid side must be fully evacuated back to the main reservoir through a safety release block. Always verify that the online pressure gauges read zero. Loosening fittings under pressure can cause high-velocity fluid injection or component blowout, risking severe injury.

• Controlled Slow-Feed Precharging Protocol to Protect the Membrane: When replenishing nitrogen gas via a standard charging apparatus (such as a Hydac FPU-1 kit), open the nitrogen bottle regulator slowly to feed gas in a controlled stream—never blast high-pressure gas into the shell instantly. Rapid gas injection causes severe thermodynamic cooling and localized stress, which can wrinkle or tear the diaphragm before it unrolls smoothly.