1. Product Overview
TheKYB PSVD2-27Eis avariable-displacement axial piston pumpmanufactured by Japan’s KYB Corporation, belonging to thePSVD series(dual-pump combined flow design). It is specifically engineered to deliver high-pressure, large-flow hydraulic power for construction machinery, industrial equipment, and agricultural machinery. Its core advantages includehigh efficiency, low noise, and exceptional reliability, making it suitable for closed or open hydraulic systems requiring dynamic flow adjustment.
2. Key Specifications & Technical Parameters
【表格】
Parameter Description
Model PSVD2-27E
Structure Type Dual-pump axial piston variable-displacement pump (independent or combined flow)
Displacement Single pump: 27 mL/rev (total 54 mL/rev in combined mode)
Rated Pressure 28 MPa (280 bar) continuous, peak pressure 35 MPa (350 bar)
Speed Range 600–2,200 rpm (recommended economic range: 1,200–1,800 rpm)
Flow Range Single pump max flow: 48.6 L/min (27 mL/rev × 1,800 rpm)Combined mode: 97.2 L/min
Control Method Pressure compensation (PC), load sensing (LS), or manual variable adjustment
Weight Approx. 35 kg (including pump body, variable mechanism, and connectors)
Port Sizes Input shaft: Φ35mm (spline or parallel key)Outlet: SAE 12 port (G1 1/2" thread)
Fluid Compatibility Mineral-based hydraulic oil (ISO VG32-68), anti-wear additives recommended
Environmental Adaptability Operating temperature: -20°C to +80°C (oil temp)Storage temperature: -40°C to +70°C
3. Technical Features
• Dual-Pump Combined Flow Design:
Enables independent operation or internal channel combination for flow summation (max 97.2 L/min), meeting simultaneous multi-actuator demands (e.g., excavator boom + arm compound motion).
• Flexible Variable Control:
• Pressure Compensation (PC): Automatically adjusts displacement based on system pressure for constant power output.
• Load Sensing (LS): Dynamically matches flow to load demand via pressure sensor feedback, achieving 15%–20% energy savings.
• Manual Adjustment: Suitable for fixed operating conditions or debugging.
• High Efficiency & Low Noise:
• Chrome-plated piston pairs reduce friction by 30%, with volumetric efficiency ≥92%.
• Optimized swashplate angle minimizes mechanical shock, achieving noise ≤75 dB (at 1m distance).
• Durability Design:
• Double-row tapered roller bearingswithstand radial/axial combined loads, extending service life to ≥10,000 hours.
• Cast iron housingprovides strong impact resistance for vibratory environments (e.g., vibratory rollers).
4. Selection Guidelines
• Pressure Matching:
Ensure system maximum pressure ≤28 MPa (continuous). For higher pressure, opt for PSVD2-34E (34 mL/rev displacement, 32 MPa rated pressure).
• Flow Requirements:
• Single-pump mode: Suitable for single actuators with flow ≤48.6 L/min (e.g., cylinders).
• Combined mode: Prioritize for multi-actuator synchronization or high-flow demands (e.g., hydraulic motor drives).
• Control Method Selection:
• Pressure Compensation (PC): Ideal for scenarios with large load fluctuations (e.g., hydraulic breakers).
• Load Sensing (LS): Recommended for multi-actuator energy-saving control (e.g., forklift lifting + steering).
• Manual Variable: Suitable for fixed operating conditions (e.g., test benches).
• Fluid Compatibility:
Avoid water-based hydraulic oils or phosphate ester-based fire-resistant fluids (requires special seals).
5. Application Scenarios
• Construction Machinery:
• Excavators (main pump combined flow for boom, arm, and swing motor).
• Wheel loaders (work device and steering system compound control).
• Cranes (luffing mechanism and swing mechanism synchronized operation).
• Industrial Equipment:
• Injection molding machines (clamping and injection system pressure/flow matching).
• Die-casting machines (slow clamping + rapid injection dual-stage control).
• Metal forming presses (hydraulic shearing and bending coordination).
• Agricultural Machinery:
• Combine harvesters (header lifting and threshing drum speed linkage).
• Tractors (PTO output and hydraulic suspension independent control).
