Parameters of NACHI Variable Displacement Vane Pump VDR-1A-1A4-22

1. Basic Information

• Model: VDR-1A-1A4-22
• Product Type: Variable Displacement Single Vane Pump
• Series: VDR 22 Design Series
• Mounting Method: Foot Type Mount (Code “A”)
• Design Number: 22

2. Technical Parameters

• Displacement: 16.7 cc/rev
• No-Load Discharge Flow: 30 L/min (7.9 gpm) at 1800 min⁻¹; 25 L/min at 1500 min⁻¹; 20 L/min at 1200 min⁻¹; 16.7 L/min at 1000 min⁻¹
• Pressure Adjustment Range: 6.5 – 10.5 MPa (66.3 – 107 kgf/cm²; 942 – 1522 psi)
• Allowable Peak Pressure: 14 MPa (143 kgf/cm²; 2030 psi)
• Rotational Speed Range: Minimum 800 min⁻¹, Maximum 1800 min⁻¹
• Weight: 9 kg (19.9 lb) (Foot Mounting Type)
• Flow Characteristics: Constant Discharge Rate Type (Code “A”)
• Ring Size: Code “1”

3. Performance Characteristics

• Stable and efficient operation up to 14 MPa, with minimal ring vibration and leak-free pressure balance construction。
• High-precision instantaneous response, ensured by a special bias piston mechanism for prompt on-off operation。
• Silent operation even in high-pressure ranges, thanks to quiet journal bearings and optimized suction/discharge port design。
• Reduced power loss, especially at full cutoff, via NACHI original mechanical innovations and precision machining。
• Durable construction with high-quality materials, suitable for harsh operating conditions。

4. Notes

• When the ring size is Code “2”, the maximum setting pressure is 7 MPa (71.4 kgf/cm²; 1015 psi)。
• The pump is designed for reliable performance in various industrial hydraulic systems, and its compact structure facilitates easy installation and maintenance。