NXQ Series Bladder Accumulator | NXQ-40/31.5 NXQ-63/31.5 NXQ-0.4/31.5

The NXQ Series bladder accumulators by Chengyuan Hydraulic are high-pressure energy storage components manufactured in strict accordance with national industrial safety standards. This range is optimized for core models such as NXQ-40/31.5-L-Y, NXQ-63/31.5-L-Y, and the compact NXQ-0.4/31.5-L-Y.

Acting as a “pressure buffer station” and “energy reservoir,” the NXQ series utilizes a Nitrogen ($N_2$) filled bladder within a high-strength steel shell to absorb and release energy instantaneously. Chengyuan ensures 100% original-place interchangeability for all installation ports and gas valve specifications. Every unit undergoes ultrasonic flaw detection and 100% hydrostatic strength testing to guarantee safety and fatigue resistance at a rated pressure of 31.5 MPa.

Technical Specifications 

• Series Compatibility: NXQ Series Standard Bladder Accumulator

• Core Models Matrix: NXQ-40/31.5-L-Y, NXQ-63/31.5-L-Y, NXQ-0.4/31.5-L-Y

• Nominal Volume:

  • NXQ-0.4: 0.4 Liters

  • NXQ-40: 40 Liters

  • NXQ-63: 63 Liters

• Nominal Pressure: 31.5 MPa (315 bar)

• Fluid Medium: L-Hydraulic Oil (Mineral Oil)

• Connection Type: Y-Threaded connection

• Housing Material: Seamless high-strength alloy steel (35CrMo or 45#)

• Bladder Material: NBR (Standard Nitrile Rubber)

• Charging Valve Interface: M28×1.5 Standard

Key Technical Advantages:

• Seamless Forged Shell Technology: The shell is formed via spinning or whole-extrusion of high-quality seamless steel pipes. This weld-free structure eliminates stress concentrations, providing superior fatigue life under frequent 31.5MPa pulsation cycles.

• High-Density Anti-Permeation Bladder: The internal bladder is crafted from a specialized NBR compound with ultra-low microporous permeability. This maintains nitrogen pressure over longer periods, reducing maintenance frequency and enhancing elastic recovery efficiency.

• Hydrodynamic Optimized Poppet Valve: The bottom poppet valve is optimized to ensure minimal pressure drop during high-speed fluid transfer. It includes an anti-extrusion mechanism to prevent the bladder from being drawn into the port during rapid discharge.

• Corrosion-Resistant Surface Treatment: Each unit features a durable industrial-grade powder coating, enabling stable operation in harsh environments such as mining, metallurgy, and outdoor heavy industries.

Application Areas:

• Heavy Machine Tools: Compensating flow in rapid-travel circuits to reduce installed motor power.

• Metallurgy & Power Plants: Absorbing pressure pulsations from high-pressure pumps to eliminate pipeline vibration.

• Construction Machinery: Serving as an emergency power source for safety locking in the event of pump failure or power loss.

Expert Maintenance Tips:

• Charging Media Warning: Never use Oxygen or compressed air. Only use Nitrogen ($N_2$) with purity $\ge 99.9\%$ to avoid the risk of explosion.

• Pre-charge Pressure Calibration: The pre-charge pressure $P_0$ should typically be set at 0.9 times the minimum operating pressure ($P_0 = 0.9 \times P_1$). Check nitrogen levels quarterly to prevent damping drift.

• Depressurization Safety: Before any maintenance, ensure that the hydraulic oil pressure in the accumulator is fully bled to zero via a relief valve and verified by a pressure gauge.