A4VSO180EO2/30R-PPB13N00 A4VSO180EO1/30R-VPB25N00 A4VSO180EO1/30R-VZB13N00 A4VSO180LR2G/30R-VZB13N00 A4VSO180LR2G/30R-VPB25N00 Industrial variable high-pressure pump A4VSO180, German Rexroth piston
Industrial variable high-pressure pump A4VSO180 series from Rexroth, featuring German-engineered piston technology for demanding hydraulic applications.
Frequently Asked Questions
1. What is the fundamental working principle of the A4VSO series pump?
The A4VSO series is a swashplate-type axial piston pump designed for open-circuit systems. Its flow output is proportional to the input drive speed and its displacement volume. The displacement is infinitely variable by adjusting the angle of the swashplate. It's known for its excellent suction characteristics, low noise, long service life, and high power-to-weight ratio. Multiple control options are available to meet various system requirements.
2. What are the common control methods for the A4VSO pump?
The A4VSO series offers a wide range of variable control methods. The most commonly used include: DR/DRG (Pressure Control), LR (Constant Power Control), EO/EO2 (Electroproportional Control). Other available controls include FR (Flow Control), MA (Manual Control), EM (Electric Motor Control), HW/HM/HS/HD (Various Hydraulic Controls), and DS (Secondary Control for speed sensing).
3. How does the DR Pressure Control (Pressure Cut-Off) work?
The DR control maintains a constant system pressure by changing the swashplate angle. When the system pressure reaches the spring-set value on the DR valve, the control mechanism acts to reduce the pump's displacement, delivering only the flow required to maintain the set pressure. A system safety valve is still essential because the DR control's response is relatively slow compared to sudden pressure shocks.
4. What is the difference between DRG and DP control types?
Both DRG and DP are forms of constant pressure control, but they are designed for different applications. DRG allows the pressure setpoint to be adjusted remotely via an external pressure control valve. DP is specifically designed for systems where multiple pumps work in parallel, containing an additional element that mechanically links to the swangle to ensure pumps share the load equally.
5. Why might multiple A4VSO DR pumps in parallel cause system vibration?
When multiple pumps with standard DR controls are set to the same pressure, slight inherent differences in their response characteristics can cause them to not reduce displacement at exactly the same time and rate. This lack of synchronization can lead to interactions between the pumps, resulting in pressure fluctuations and potentially causing severe pipeline vibration.
6. What are the key specifications of the A4VSO series?
Common Displacement Specifications: 40, 71, 125, 180, 250, 355, 500, 750 ml/rev. Nominal Pressure: 350 bar. Peak Pressure: 400 bar. Features a specially designed, long-life, high-precision full roller bearing and through-shaft design for multi-pump configurations.
7. What should be considered during commissioning and adjustment?
Key considerations include: proper alignment (3-5 mm coupling gap), filling & venting procedures, correct rotation direction verification, appropriate minimum flow setting, and for DP controls, proper pressure differential setup (typically 33 bar standard sum).
8. In which industries are A4VSO pumps commonly applied?
A4VSO pumps are widely used in high-pressure, heavy-duty industrial applications including: ceramic presses, refractory material presses, steel and forging equipment, metallurgical machinery, mining machinery, marine machinery, petroleum equipment, engineering machinery, and machine tools.
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