Hydac NXQ Series Bladder Accumulator | NXQ-0.4/31.5-L-Y | High Pressure Hydraulic Storage

The NXQ Series Bladder Accumulator, precision-manufactured by Chengyuan Hydraulic, is a high-efficiency energy storage component engineered to the exacting technical standards of Hydac. Functioning as the “energy bank” of a hydraulic system, the NXQ series is vital for storing pressurized fluid, dampening pulsations, and providing emergency power during failures. Our products, such as the NXQ-0.4/31.5-L-Y, guarantee 100% Drop-in Interchangeability with Hydac units, featuring identical mounting footprints and thread specifications. At Chengyuan, safety is paramount; every accumulator shell is hydrostatically tested at 1.5x rated pressure, and we utilize premium imported bladders to ensure zero gas permeation and long-term reliability under 31.5 MPa (4,568 psi) conditions.

Technical Specifications 

• Compatible Brand: Hydac (NXQ Series Standard)

• Core Models: NXQ-L0.4, L0.63, L1, L1.6, L2.5, L4, L6.3, L10, L16, L25

• Full Code Meaning: e.g., NXQ-0.4/31.5-L-Y (0.4L Volume / 31.5MPa Pressure / Threaded Connection)

• Nominal Capacity: 0.4L up to 25L available

• Max Operating Pressure: 31.5 MPa (315 bar / 4568 psi)

• Gas Medium: Nitrogen ONLY (Never use oxygen or flammable gases)

• Operating Temperature: -10°C to +70°C (Standard NBR bladder)

• Fluid Port Types: L (Threaded), F (Flanged)

• Shell Material: High-strength seamless alloy carbon steel

Key Technical Advantages:

• Seamless Forged Steel Shell: Manufactured using advanced spinning and cold-forming processes, our shells offer uniform wall thickness and exceptional structural integrity. Each shell is heat-treated to resist fatigue over millions of pressure cycles.

• Premium Elastomer Bladders: We utilize high-grade imported NBR or Viton compounds that feature ultra-low permeability. The integrated poppet valve prevents bladder extrusion during high-flow discharge, ensuring consistent performance.

• Superior Pulsation Dampening: The highly resilient bladder responds instantaneously to high-frequency pressure spikes, significantly reducing pipe vibration and protecting sensitive hydraulic components from fatigue.

• Rigorous Safety Certification: Every unit undergoes a 100% hydrostatic strength test and a nitrogen leak test before shipping. Our production complies with international pressure vessel safety standards, providing peace of mind in high-pressure environments.

Application Areas:

• Industrial Automation: Used in machine tools, injection molding, and presses for energy storage and leakage compensation.

• Mobile Machinery: Absorbs road shocks in construction vehicles and serves as emergency power for crane descent.

• Power & Energy: Critical for pitch and yaw control in wind turbines to ensure safe emergency shutdown.

• Metallurgy & Mining: Eliminates hydraulic hammer in large-scale shearing and crushing equipment.

Expert Maintenance Tips:

• Pre-charge Calibration ($p_0$): Ensure the nitrogen pre-charge pressure is set to approximately 90% of the minimum system operating pressure. Incorrect pre-charge will lead to premature bladder failure.

• Pressure Monitoring: Inspect the pre-charge pressure weekly during the first month of operation, then quarterly thereafter, using a calibrated charging and testing kit.

• Safety Protocol: Before performing any maintenance on the accumulator or its associated valves, always vent the fluid side pressure to zero to prevent dangerous accidental discharge.