1. Model Code Explanation
SB330-50A1/669U-330
SB330: Standard bladder accumulator series, max operating pressure 330 bar
50: Nominal volume 50 liters
A1: Standard American thread oil port with built-in check valve
669U: Charging valve code; “U” stands for standard charging valve (without explosion-proof / ATEX certification)
330: Rated working pressure 330 bar
2. Pressure Parameters
Nominal / Maximum Operating Pressure: 330 bar (33 MPa)
Housing Burst Pressure: Approx. 500 bar
Recommended Nitrogen Pre-charge Pressure: 0.6 ~ 0.85 × minimum system working pressure
Compatible Media: Standard mineral hydraulic oil
3. Volume & Flow Rate
Nominal Volume: 50 L
Effective Oil Discharge Volume: 32 ~ 38 L (depends on system pressure differential)
Max Permissible Flow Rate: 25 L/s (standard SB330-N flow design)
4. Standard Material Configuration
Accumulator Housing: Seamless low-temperature carbon steel with red anti-corrosion coating
Bladder: NBR nitrile rubber (compatible with mineral hydraulic oil)
Oil Port Valve Body: Carbon steel
Charging Valve: Model 669U standard threaded valve for nitrogen charging & discharging
5. Dimension Data (Unit: mm)
Outer Diameter of Cylinder: 229 mm
Overall Length (excluding external pipe fittings): 1931 mm
Bottom Oil Port Thread: G2 (2 inch pipe thread)
Top Charging Valve Thread: 7/8-14 UNF
SB330-50A1/669U-330, SB330-50A1/669U-330A
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