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1. What does the model “A4VSO 250/Dfe1z30r-Pzb25u99” stand for?
| Model Segment | Explanation |
|---|---|
| A4VSO | Series Name: Axial Piston Variable Displacement Pump (High-pressure, industrial-grade) |
| 250 | Nominal Displacement: 250 cm³/rev (cubic centimeters per revolution) |
| Dfe1 | Control Type: D = Directional control; fe1 = Electro-hydraulic proportional flow control with pressure cut-off |
| z30r | Variable Mechanism: z = Zero-offset design; 30 = Maximum swivel angle (30°); r = Right-hand swivel direction |
| Pzb25u99 | Additional Configuration: P = Pressure feedback function; zb = Integrated relief valve; 25 = Relief valve setting (250 bar); u99 = Factory calibration code (standard performance) |
2. What are the core technical parameters of this pump?
- Nominal Displacement: 250 cm³/rev
- Maximum Working Pressure: 400 bar (5801 psi)
- Rated Working Pressure: 350 bar (5075 psi)
- Maximum Speed: 1800 rpm (clockwise/counterclockwise optional)
- Minimum Speed: 600 rpm
- Oil Viscosity Range: 15 – 380 mm²/s
- Recommended Oil Temperature: -10°C to +90°C (14°F to 194°F)
- Oil Filtration Requirement: ≥ 10 μm (ISO 4406 Class 16/13)
- Shaft End Type: Tapered keyed shaft (ISO 286-2)
- Mounting Standard: SAE J744 (4-bolt flange, SAE C)
- Inlet/Outlet Port Size: Inlet: G2″ (BSPP), Outlet: G1 1/2″ (BSPP)
- Dry Weight: Approx. 85 kg (187.4 lbs)
3. What are the key performance features of the A4VSO 250 pump?
- High-Pressure Stability: Axial piston design with precision-machined cylinder block and pistons ensures volumetric efficiency ≥ 96% and mechanical efficiency ≥ 93% under full load.
- Proportional Control Precision: Electro-hydraulic proportional flow control (fe1) allows stepless flow adjustment (0-100%) via 4-20mA signal, suitable for automated systems.
- Integrated Protection: Built-in pressure relief valve (zb) and anti-cavitation valve prevent system damage from pressure spikes and oil starvation.
- Durable Construction: Housing made of nodular cast iron; wear-resistant coating on piston rings and valve plates extends service life in harsh conditions (e.g., mining, construction).
- Low Noise Operation: Optimized flow channel and damping structure reduce noise to ≤ 82 dB(A) at rated speed.
- Energy Efficiency: Variable displacement design adjusts output flow based on system demand, reducing power consumption by 15-30% compared to fixed-displacement pumps.
