NXQ NXQA Bladder Accumulator | NXQA-4/10-L-Y NXQA-4/20-L-Y | Hydraulic Accumulator

The NXQ Series bladder accumulators by Chengyuan Hydraulic are high-efficiency pressure vessels designed according to international standards (including NXQA and NXQAB types). By isolating nitrogen gas from hydraulic fluid using a high-quality rubber bladder, these units utilize gas compressibility to store hydraulic energy. Our products feature 100% original-place interchangeability, allowing for the direct replacement of leading global brands. Every shell undergoes rigorous pressure pulse testing and overpressure safety verification. Combined with our high-airtightness bladders, the NXQ series ensures zero pressure drop under long-term high-pressure operation, making it the ideal auxiliary power source and pulse damper for modern hydraulic systems.

Technical Specifications:

• Representative Models: NXQA-4/10-L-Y, NXQA-4/20-L-Y, NXQAB-10/31.5-L-Y

• Nominal Volumes: $0.4\text{L}, 0.63\text{L}, 1\text{L}, 2.5\text{L}, 4\text{L}, 10\text{L}$ up to $160\text{L}$

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

• Fluid Connection: Threaded (L) or Flanged (F)

• Working Media: Mineral Oil (Y), Water-Glycol, Phosphate Ester

• Shell Material: High-strength seamless steel (35# steel)

• Bladder Material: NBR (Standard), FKM (Viton) for chemical resistance

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

Key Technical Advantages:

• High-Strength Seamless Forged Shell: Formed through a specialized spinning process from premium seamless tubing, the shell features a smooth interior and uniform stress distribution. This results in a fatigue life 40% higher than welded alternatives.

• Premium Synthetic Bladder: Our bladders offer extremely low permeability and exceptional resilience. Even under high compression ratios, the material avoids pleat damage. Specialized elastomers are available to resist hardening or leaking in chemically aggressive environments.

• Integrated Poppet Valve Protection: The bottom oil port is equipped with an automatic poppet valve. When fluid is discharged, the valve closes to prevent the bladder from being extruded into the oil port, significantly extending maintenance intervals.

• 100% Factory Safety Testing: Before shipment, every accumulator is subjected to a hydrostatic test at $1.25\text{–}1.5$ times its rated pressure and monitored for 24 hours for airtightness, ensuring compliance with global pressure vessel safety codes.

Application Areas:

• Auxiliary Power: Providing instantaneous high flow for intermittent cycles in injection molding or die-casting machines.

• Energy Storage: Serving as an emergency power source during pump failure or power outages.

• Pulsation Dampening: Absorbing pressure ripples from piston pumps to reduce system vibration and noise.

• Thermal Expansion Compensation: Managing pressure fluctuations caused by temperature changes in closed-loop systems.

Expert Maintenance Tips:

• Pre-charge Pressure ($P_{0}$): Usually, $P_{0}$ should be set to $0.9$ times the minimum working pressure of the system. Incorrect pre-charge levels can lead to excessive bladder stretching or crushing.

• Nitrogen Only: Never fill an accumulator with oxygen or compressed air; it must be filled with nitrogen (purity $\ge 99.9\%$) to avoid explosion risks.

• Routine Checks: It is recommended to check the pre-charge pressure every 15 days during the initial operation phase, and every six months once the system has stabilized.