Olaer EHV Bladder Accumulator | EHV 10-330 EHV 6-350 High Pressure Accumulator

The EHV Series high-pressure bladder accumulators manufactured by Chengyuan Hydraulic are high-efficiency fluid power storage and pulsation dampening modules fully engineered to match global Olaer (now part of the Parker Hannifin group) industrial footprints. Designed to perform as dependable auxiliary energy reservoirs, emergency fluid power stations, and transient shock conquerors, this heavy-duty series covers prominent high-capacity profiles such as EHV 10-330/90 and 50-330/, alongside ultra-high pressure variants like the 2.5-350/90, 4-350/90, and EHV 6-350/90. Every singular EHV unit is subjected to 100% water-jacket hydrostatic pressure validation and helium/nitrogen gas-tight leakage maintenance checks under maximum design constraints to align with PED regulatory security coefficients, delivering guaranteed 100% original-place interchangeability.

Technical Specifications :

• Core Product Series: Olaer EHV Series Carbon Steel High-Pressure Bladder Accumulators

• Model Configurations Supported: EHV 10-330/90 / 50-330/ / 2.5-350/90 / 4-350/90 / EHV 6-350/90

• Nominal Volumetric Capacities:

  • 2.5-350 Profile: 2.5 Liters Gas Volume

  • 4-350 Profile: 4.0 Liters Gas Volume

  • 6-350 Profile: 6.0 Liters Gas Volume

  • 10-330 Profile: 10.0 Liters Gas Volume

  • 50-330 Profile: 50.0 Liters Gas Volume

• Nominal Operating Pressure Designators:

  • Code 330: Maximum working envelope of 330 bar (33 MPa / 4785 psi)

  • Code 350: Maximum working envelope of 350 bar (35 MPa / 5075 psi)

• Regulatory Compliance Directive (90): Specifies compliance with CE / PED (Pressure Equipment Directive) frameworks and international manufacturing codes

• Operational Fluid Temperature Envelope: -20°C to +80°C (standard NBR elastomer bladder configuration)

• Gas Charging Interface Thread: Standard M28×1.5 layout (seamlessly mates with OEM gas charging kits)

• Fluid Port Interface: Equipped with an internal high-flow poppet valve assembly; port endings are machined in metric/SAE standard 4-bolt flanges or G/BSP female threads

Key Technical Advantages:

• Monoblock Seamless Cold-Drawn Steel Shell Architecture: The EHV exterior shell features no welded seams. Machined from premium carbon steel tubes through seamless cold-drawing and precise thermal hot-spinning techniques, this monolithic shell achieves an unbroken fiber structure. This topology eliminates point stress concentration zones and micro-fatigue fracturing, yielding safety coefficients that far exceed welded vessels.

• Premium Elastomer Bladders with Low Gas Permeability: The internal gas bladder is synthesized from highly cross-linked NBR or specialized epichlorohydrin (ECO) compound formulations subjected to secondary vulcanization. It exhibits exceptional flex fatigue limits under high-frequency expansions and cuts nitrogen ($N_2$) gas micro-migration rates by over 60% compared to generic alternative bladders.

• Anti-Extrusion Poppet Fluid Valve Design: The central oil port houses a spring-loaded alloy steel poppet valve. During extreme cycle discharges when the bladder expands down rapidly toward the fluid terminal, the poppet mechanically seats first, blocking the port orifice and preventing the flexible rubber skin from extruding into the pipeline and shredding.

• Ultra-Low Flow Resistance for Millisecond Energy Release: The EHV geometry is configured specifically for high-delivery volume flows ($Q$), expanding the physical flow margins of the lower fluid gallery. Minimizing fluid restriction enables the accumulator to unleash peak fluid energy in millisecond intervals, making it a powerful weapon for subduing pipeline water hammer surges and backing up heavy press fast-stroke motions.

Application Areas:

• Heavy Forging Presses & Metal Stamping Machine Tools: Serving as the primary high-flow storage accumulator assisting hydraulic cylinders during compression, lowering central HPU motor sizing requirements.

• Wind Turbine Pitch Control Systems & primary Steel Casting Loops: Delivering emergency failsafe hydraulic pressure to orient blade profiles during sudden grid disconnects, alongside blast furnace ladle locking circuits.

• Heavy Mobile Machinery & Marine Tooling: Mechanical boom energy recovery loops for mining excavators, heavy deck windlass braking circuits, and fluid concrete boom-pump cylinder oscillation damping.

Expert Maintenance Tips:

• Mandatory Usage of Inert Nitrogen ($N_2$) and Precharge Verification: The accumulator housing must be charged exclusively with pure industrial Nitrogen gas ($N_2$) matching a minimum purity threshold of $\ge 99.99\%$—never charge with compressed air, Oxygen, or combustible gases, which will ignite under high-pressure thermodynamic cycling. The nominal precharge pressure limit ($P_0$) should be verified at 60% to 90% of the lowest system operating index.

• Enforce Strict System Isolation Before Servicing: Prior to disconnecting any mechanical fittings or testing structural seals, the pressurized oil trapped within the accumulator must be fully vented back to the reservoir via a certified safety block assembly until the primary line gauge drops to zero. Never work on a live accumulator.

• Anti-Friction Bladder Priming Protocol: When inserting and setting a brand-new rubber bladder into the steel shell, you must pre-lubricate the interior cavity by pouring in roughly 1 liter of clean, system-matched hydraulic oil. Administer the initial nitrogen feed slowly; this cushion allows the bladder to slide and unroll smoothly along its linear axis, avoiding internal binding or folding stresses that rupture the skin.