Parameters and Model Explanation of NACHI Hydraulic Pump VDR-1A-1A3-13

1. Model Explanation

• VDR: Series identifier, indicating NACHI VDR series variable volume vane pump, which is an energy-saving and economical pump with a built-in high-precision pressure compensation structure.
• 1: Pump size, representing the basic size specification of the pump, which is consistent with the installation dimensions of the previous VDR-1 series (11/12 types) and has installation interchangeability.
• A: Mounting method, indicating foot-type mounting; if it is “B”, it means flange-type mounting.
• 1: Ring size, representing the specification of the oil ring inside the pump, which is matched with the pump size to ensure stable operation.
• A: Flow characteristic, indicating constant discharge type, which ensures stable output flow during operation.
• 3: Pressure adjustment range, corresponding to 3~6 MPa (30.6~61.2 kgf/cm² or 435~870 psi), which is the adjustable range of the pump’s working pressure.
• 13: Design number, representing the 13th design iteration of the VDR series, improved from the old 11/12 types, with optimized noise reduction and durability performance.

2. Technical Parameters

• Pump Type: Variable volume vane pump (single pump)
• Displacement:
  • At 1000 min⁻¹ (no-load): Approximately 16.7 L/min (4.4 US gpm)
  • At 1200 min⁻¹ (no-load): Approximately 20 L/min (5.3 US gpm)
  • At 1500 min⁻¹ (no-load): Approximately 25 L/min (6.6 US gpm)
  • At 1800 min⁻¹ (no-load): Approximately 30 L/min (7.9 US gpm)
• Pressure Range:
  • Adjustment range: 3~6 MPa (30.6~61.2 kgf/cm², 435~870 psi)
  • Maximum instantaneous pressure: 14 MPa (143 kgf/cm², 2030 psi)
  • Factory set pressure: 3 MPa (30.6 kgf/cm²)
• Speed Range: Minimum 800 min⁻¹, maximum 1800 min⁻¹
• Rotation Direction: Clockwise (viewed from the shaft side)
• Weight: Approximately 13.6 kg (30 lbs) for foot-type mounting (model A)
• Drainage Requirement: The drain pipe must be directly connected below the oil tank liquid level, and the pipe resistance should not exceed 0.03 MPa (4.35 psi)
• Hydraulic Oil Requirement: R&O type anti-wear hydraulic oil, ISO VG32~68 (viscosity index ≥90), operating viscosity range 20~150 mm²/s; oil temperature 15~60℃, ambient temperature 0~60℃
• Suction Pressure: -0.03~+0.03 MPa (-0.3~+0.3 kgf/cm²), suction port flow rate ≤2 m/sec; suction filter with 100 μm (150 mesh) filtration accuracy, return line filter with 25 μm filtration accuracy

3. Key Features

• Energy-saving and economical, with minimal power loss, especially at full cutoff.
• Built-in high-precision pressure compensation structure, the oil ring is eccentric under spring force and moves to the center automatically as pressure rises, reducing discharge to zero when necessary.
• Eliminates the need for relief valves and unloading valves in the circuit, simplifying the hydraulic system.
• New design achieves low noise and high durability, with stable operation even in high-pressure ranges.
• Precise performance and quick response, ensuring instantaneous and stable high-precision operation during on-off switching.