Hydac NXQ Series Bladder Accumulator | NXQ-L0.4/10-Y NXQA-0.4 | 0.4L Hydraulic Storage

The NXQ and NXQA Series Bladder Accumulators by Chengyuan Hydraulic are precision-engineered replacements designed to meet the rigorous technical standards of Hydac. Specifically, the 0.4-liter compact series, such as the NXQ-L0.4/31.5-Y, is optimized for high-pressure systems where installation space is a premium. Functioning as a high-response “energy reservoir,” these units are critical for pulsation dampening and emergency power support. Chengyuan guarantees 100% Drop-in Interchangeability with Hydac models, matching all fluid and gas interface specifications. Every unit is subjected to 100% simulation load testing to ensure structural integrity and zero gas leakage in the most demanding industrial environments.

Technical Specifications 

• Compatible Brand: Hydac (NXQ/NXQA Standard)

• Core Model Codes: NXQ-L0.4/10-Y, NXQ-L0.4/20-Y, NXQ-L0.4/31.5-Y, NXQA-0.4/10-L-Y

• Nominal Capacity: 0.4 Liters

• Rated Pressure Ratings: 10 MPa (100 bar), 20 MPa (200 bar), 31.5 MPa (315 bar)

• Gas Port Connection: Standard 5/8-18UNF inflation valve

• Fluid Port Interface: Threaded (Typically M22x1.5 or G1/2″ per Y/L code)

• Shell Construction: Seamless forged alloy steel (spinning process)

• Bladder Compound: High-grade NBR (standard) or FKM (optional)

• Gas Medium: Nitrogen (N2) ONLY

Key Technical Advantages:

• Seamless Spinning Technology: The accumulator shell is cold-formed from high-strength seamless alloy steel. This process ensures uniform wall thickness and eliminates welding stresses, providing superior fatigue resistance under 31.5 MPa cycling.

• High-Response Bladder Design: Our bladders feature premium elastomer compounds with ultra-low gas permeability. The high elasticity allows the accumulator to respond instantly to micro-fluctuations, dampening vibration effectively.

• Integrated Poppet Valve Protection: The fluid port includes a precision poppet valve. This mechanism prevents the bladder from extruding into the fluid port during rapid discharge, significantly extending the service life of the internal bladder.

• Verified Safety Factor: Every unit is hydrostatically tested at 1.5x the rated pressure. Chengyuan’s testing protocol ensures that every 0.4L unit maintains zero-leak performance and structural stability at peak load.

Application Areas:

• Compact Hydraulic Power Units (HPU): Dampens piston pump pulsations to reduce overall system noise.

• Machine Tool Clamping: Maintains constant pressure in clamping circuits and compensates for minor internal leakage.

• Mobile Braking Systems: Serves as a reliable emergency power source for braking or steering in construction machinery.

• Precision Automation: Absorbs high-speed hydraulic shocks generated by fast-switching directional valves.

Expert Maintenance Tips:

• Nitrogen Only: Never fill the accumulator with oxygen or compressed air. The use of oxidizing gases will lead to an internal explosion and catastrophic equipment failure.

• Pre-charge Setting ($p_0$): We recommend setting the nitrogen pre-charge to 90% of the minimum system operating pressure. Excessive pre-charge causes the bladder to strike the poppet valve repeatedly, leading to premature tearing.

• Periodic Inspection: Check the gas pre-charge every 3 to 6 months using a certified charging and testing kit to maintain optimal energy storage efficiency.