NXQ NXQA Series Bladder Accumulator | NXQA-2.5/10 NXQA-2.5/31.5 | Hydraulic Energy Storage

The NXQ and NXQA Series bladder accumulators by Chengyuan Hydraulic are essential energy storage and pressure pulsation dampening devices for modern hydraulic systems. This range includes key models such as NXQA-2.5/10-L-Y, NXQA-2.5/20-L-Y, and the high-pressure NXQA-2.5/31.5-L-Y (2.5-liter capacity). Utilizing the compressibility of nitrogen gas, these accumulators store hydraulic potential energy within a high-resilience rubber bladder. Constructed from high-strength seamless steel shells, they are manufactured to strict pressure vessel safety standards. Every unit undergoes 100% gas-tightness and proof-pressure testing to ensure absolute safety and high-speed response under demanding high-pressure cycles.

Technical Specifications :

• Core Models: NXQ, NXQA (Type A standard connection)

• Nominal Volume: $0.4\text{ L}$ to $160\text{ L}$ (Featured model is $2.5\text{ L}$)

• Nominal Pressures: $10\text{ MPa}, 20\text{ MPa}, 31.5\text{ MPa (up to 4570 psi)}$

• Operating Media: Mineral oil, Water-glycol, Phosphate ester (Subject to bladder material)

• Temperature Range: $-10\text{°C}$ to $+70\text{°C}$

• Shell Material: $35\text{CrMo}$ or high-grade seamless carbon steel (Forged/Extruded)

• Bladder Material: NBR (Standard), FKM, or IIR for specific chemical compatibility

Key Technical Advantages:

• One-Piece Seamless Shell: NXQ shells are extruded from premium alloy steel. The weld-free design eliminates stress concentration points, while phosphate or epoxy surface treatments provide excellent fatigue resistance and corrosion protection.

• Low-Permeability Bladder Design: Manufactured with specialized rubber compounds, the bladders feature extremely low gas permeability and superior dynamic elasticity. They maintain structural integrity over millions of cycles, minimizing nitrogen loss.

• Precision Poppet Valve: The oil port is equipped with a responsive poppet valve that automatically closes when the bladder is fully extended. This prevents bladder extrusion into the pipeline and ensures maximum flow rate during discharge.

• Ultra-Fast Dynamic Response: Due to the low mass of the bladder, its inertia is significantly lower than that of piston accumulators. This allows the NXQ series to instantaneously absorb high-frequency pulsations and hydraulic shocks (water hammer), protecting downstream components.

Application Areas:

• Emergency Power: Providing auxiliary flow to complete critical safety maneuvers (e.g., closing safety gates) during pump failure.

• Pressure Compensation: Buffering pressure fluctuations caused by thermal expansion or minor internal leakage.

• Shock Absorption: Dampening hydraulic spikes in excavators and injection molding machines during rapid valve switching.

Expert Maintenance Tips:

• Nitrogen Charging: The pre-charge pressure $P_{0}$ should typically be set to $90\%$ of the minimum system working pressure. NEVER use oxygen or compressed air, as this poses a high risk of explosion!

• Vertical Installation: Vertical mounting with the oil port facing downward is recommended. This prevents contaminants from settling on the bladder and ensures reliable poppet valve operation.

• Routine Inspection: Check the pre-charge pressure weekly during the first month of operation, then semi-annually thereafter. If a significant pressure drop is detected, inspect the gas valve core or replace the bladder.