11G5 length44mm hydraulic pump
2 week ago
Product details
NACHI 11G5 Series Hydraulic Pump (Model PVD-1B-32P-11G5): Technical Specifications & Engineering Applications
(Including Structural Features, Performance Metrics, and Industrial Use Cases)
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I. Fundamental Structure & Model Identification
1. Model Nomenclature
• PVD-1B-32P-11G5
• PVD: Bent-Axis Piston Pump (NACHI’s standard designation, distinguishing it from the PVS inline series)
• 1B: Displacement Code (single-pump design, displacement range 28–32 cc/rev)
• 32P: Pressure Rating (32 MPa rated pressure, 40 MPa peak pressure)
• 11G5: Shaft End Configuration (44 mm flanged shaft, compliant with SAE J744 standards)
2. Shaft End Specifications
• Shaft Diameter: 24 mm (ISO 3019-1 compliant)
• Shaft Length: 44 mm (±0.05 mm tolerance, precision ground)
• Keyway Dimensions: 8×7×32 mm (parallel key connection, torsional strength ≥120 N·m)
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II. Key Technical Parameters
1. Performance Metrics【表格】
Parameter Value Test Conditions
Displacement 32 cc/rev 1,800 rpm, 50°C oil temp
Volumetric Efficiency ≥93% Rated pressure
Total Efficiency ≥88% 75% load factor
Noise Level ≤78 dB(A) 1 m distance, ISO 11201 standard
Service Life 20,000 hours Mineral oil ISO VG 46, ≤80°C
2. Port Specifications
• Suction Port: G1½ (BSPP female thread, 40 mm bore)
• Pressure Port: SAE 6B flange (25 mm bore, PN400 rating)
• Case Drain Port: M14×1.5 (back pressure ≤0.3 MPa)
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III. Core Structural Features
1. Bent-Axis Variable Displacement Mechanism
• Swashplate Angle Range: ±15° (servo valve-controlled, response time <30 ms)
• Stroke Cylinder: Double-acting piston type, ±8 mm stroke, pressure compensation accuracy ±1.5%
2. Wear-Resistant Components
• Pistons: Quenched alloy steel (surface hardness HRC 62, ≥0.03 mm hard chrome plating)
• Cylinder Block: Ductile iron QT600-3 (bore honing accuracy Ra 0.2 μm)
• Port Plate: Bronze-based composite (self-lubricating layer 0.15 mm thick, seizure resistance improved by 40%)
3. Sealing System
• Shaft Seal: Fluorocarbon (FKM) U-cup (temperature range -25°C to +200°C)
• Static Seals: Metal gaskets with PTFE coating (pressure rating CLASS 600)
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IV. Typical Applications
1. Construction Machinery
• Hitachi ZX30U-2 Excavator: Direct replacement for OEM PVD-1B-32P pump, matches 18.5 kW engine
• Komatsu PC30MR-3: Powers swing motor, pressure fluctuation ≤±0.5 MPa (exceeds ISO 10770-1 standards)
2. Industrial Equipment
• Injection Molding Clamping Units: Provides 250 bar clamping force, flow repeatability ±0.8%
• Die Casting Boosters: Delivers 38 MPa instantaneous peak pressure, pressure overshoot <3%
3. Marine Machinery
• Deck Cranes: 25% improved shock load resistance (via NACHI’s patented dynamic damping technology)
• Steering Systems: Response latency <50 ms (compliant with IMO MSC.137(76) standards)
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V. Installation & Maintenance Guidelines
1. Installation Requirements
• Shaft Alignment: Motor-to-pump misalignment ≤0.05 mm (laser alignment tool recommended)
• Pipeline Cleanliness: NAS 1638 Class 6 (20 μm filter element pre-flush required)
• Pre-Fill Oil: Hydraulic oil to mid-scale on sight glass (Shell Tellus T46 recommended)
2. Maintenance Intervals【表格】
Item Interval Acceptance Criteria
Oil Analysis 500 operating hours Acid value ≤1.5 mgKOH/g
Filter Change 250 operating hours Replace when remaining life ≤10%
Shaft Seal Inspection 3,000 operating hours Leakage ≤5 mL/min
3. Fault Diagnosis
• Insufficient Pressure: 90% probability of servo piston seizure (requires servo valve disassembly and cleaning)
• Abnormal Noise: 90% probability of port plate wear (requires lapping to restore flatness ≤0.003 mm)
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