Hydac EHV Series Bladder Accumulator | EHV10-330/90 EHV10-350/90 | 10L 330 Bar Hydraulic Energy Storage

The EHV10 Series High-Pressure Bladder Accumulator, manufactured by Chengyuan Hydraulic, is engineered as a precision replacement for Hydac EHV technical standards. These accumulators, specifically models like EHV10-330/90 and EHV10-350/90, serve as high-capacity “energy batteries” for storing hydraulic fluid under pressure, absorbing shocks, and providing emergency power. At Chengyuan, we focus on 100% Drop-in Interchangeability, ensuring that fluid ports (such as A80DC-200) and shell dimensions match the original equipment perfectly. Every unit undergoes rigorous 100% simulation load testing, guaranteeing structural integrity and volumetric efficiency at peak pressures up to 350 Bar.

Technical Specifications 

• Compatible Brand: Hydac (EHV10 Series Standard)

• Target Model Codes: EHV10-350/90, EHV10-330/90, EHV 10-350/90-A80DC-200

• Nominal Capacity: 10 Liters

• Max. Operating Pressure: 330 Bar / 350 Bar (4786 psi / 5076 psi)

• Gas Port Connection: 5/8-18UNF (Standard nitrogen valve)

• Fluid Port Specification: A80DC (Threaded or flanged options available)

• Shell Material: High-tensile seamless alloy steel

• Bladder Material: Premium NBR / FKM (Optional for chemical compatibility)

• Gas Medium: Nitrogen ONLY

• Operating Temperature Range: -10°C to +80°C

Key Technical Advantages:

• Seamless Forged Construction: Manufactured using state-of-the-art seamless spinning technology, our shells offer uniform wall thickness and superior fatigue resistance compared to welded alternatives.

• Ultra-Low Permeability Bladders: Features high-grade elastomer bladders that minimize nitrogen loss. The integrated poppet valve prevents bladder extrusion during high-flow discharge, ensuring consistent energy recovery cycles.

• Effective Pulsation Dampening: The highly responsive bladder design allows the EHV series to instantaneously react to pressure spikes, effectively dampening hydraulic hammer and reducing vibration in high-flow circuits.

• Rigorous Load Verification: Every shell is hydrostatically tested at 1.5x its rated pressure. Our specialized testing protocol ensures leak-free performance and structural safety under the most demanding 350 Bar industrial cycles.

Application Areas:

• Heavy-Duty Industrial Presses: Serves as an auxiliary power source to speed up cycles and reduce energy consumption.

• Renewable Energy: Critical for emergency pitch control in wind turbines and hydraulic breaker mechanisms.

• Metallurgy & Steel Mills: Dampens pressure shocks in high-speed rolling mills and shearing equipment.

• Marine & Offshore: Provides backup power for steering gears and winch braking systems.

Expert Maintenance Tips:

• Pre-charge Calibration ($p_0$): Set the pre-charge nitrogen pressure to approximately 90% of the minimum system operating pressure. Never use compressed air or oxygen; nitrogen is mandatory for safety.

• Regular Inspection: Monitor the pre-charge pressure weekly during the first month of operation and quarterly thereafter using a calibrated charging kit.

• Safety Protocol: Before removing the accumulator or servicing connected valves, always vent the fluid-side pressure to zero and discharge the nitrogen pre-charge to prevent accidental high-pressure discharge.