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Nachi VDR – Variable Volume Vane Pump

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Nachi are a world-class manufacturer of pumps, valves, flow controls, hydraulic power units and other products. Known not only for product excellence but for our competitive pricing and product availability.

The VDC series high pressure variable volume vane pumps are a new series of pumps. In addition to Nachi’s three exclusive mechanisms (pressure control; pressure balance; ring stopper mechanism), a unique and exclusive three-point ring support system which makes maximum utilization of high pressure oil has been adopted to provide stable high pressure and quiet operation.
The new series of hydraulic pumps are ideal for applications, such as: machine tools, industrial machinery and vehicles

High efficiency, high pressure operation

The unique pressure regulator and pressure balance mechanism, plus the exclusive three-point ring support system has improved performance during high pressure operation. The pump operates with high efficiency and stable performance up to a maximum of 140kgf/cm2 (2000 psi).

Low vibration and noise levels

The new mechanisms reduces vibration and noise levels. Of particular note is the unique and exclusive threepoint support system which uses, a regulating piston and a bias piston to eliminate vibration. The mechanism, together with improvements to the shape of the inlet and outlet ports and high performance journal bearings, has reduced the noise level during operation.

Fast Response

The ring stopper mechanism serves to allow swift response whether in starting, stopping, or with load fluctuations, for high precision operation.

Stable discharge with sharp cut-off characteristics

A revolutionary pressure compensator type pressure regulation mechanism provides, stable sharp cut-off characteristics. The compensator serves to provide stable and constant volume through our the pressure ranges.

High efficiency operation with reduced power loss

Efficiency has been improved with the new mechanisms and Nachi’s high precision machining technology. Power loss has been reduced, especially during dead-heading.

Easy adjusting in maintenance and handling

Maintenance is easier due to the positioning of the pressure adjusting mechanism and the volume adjusting mechanism on the same side of the pump.

Product Features

Foot Mounting

Description VDR-1A-1A2 VDR-1A-1A3 VDR-1A-1A4 VDR-1A-1A5 VDR-1A-2A2 VDR-1A-2A3
 Delivery at 1800 R.P.M  30 L/min
(7.9 GPM)
30 L/min
(7.9 GPM)
30 L/min
(7.9 GPM)
 30 L/min
(7.9 GPM)
 40 L/min
(10.6 GPM)
 40 L/min
(10.6 GPM)
 Delivery at 1500 R.P.M   25 L/min
(6.6 GPM)
 25 L/min
(6.6 GPM)
 25 L/min
(6.6 GPM)
 25 L/min
(6.6 GPM)
 33 L/min
(8.7 GPM)
 27 L/min
(7.1 GPM)
 Delivery at 1200 R.P.M   20 L/min
(5.3 GPM)
  20 L/min
(5.3 GPM)
  20 L/min
(5.3 GPM)
  20 L/min
(5.3 GPM)
  27 L/min
(7.1 GPM)
  27 L/min
(7.1 GPM)
 Max Drive Speed  1800 rpm  1800 rpm  1800 rpm  1800 rpm  1800 rpm  1800 rpm
 Min Drive Speed  800 rpm  800 rpm  800 rpm  800 rpm  800 rpm  800 rpm
 Max Pressure  35 kgf/cm²
(500 Psi)
 70 kgf/cm²
(1000 Psi)
 105 kgf/cm²
(1500 Psi)
 140 kgf/cm²
(2000 Psi)
 35 kgf/cm²
(500 Psi)
 70 kgf/cm²
(1000 Psi)
 Weight  9 Kg  9 Kg  9 Kg  9 Kg  9 Kg  9 Kg

 Flange Mounting

Description VDR-1B-1A2 VDR-1B-1A3 VDR-1B-1A4 VDR-1B-1A5 VDR-1B-2A2 VDR-1B-2A3
 Delivery at 1800 R.P.M  30 L/min
(7.9 GPM)
30 L/min
(7.9 GPM)
30 L/min
(7.9 GPM)
 30 L/min
(7.9 GPM)
 40 L/min
(10.6 GPM)
 40 L/min
(10.6 GPM)
 Delivery at 1500 R.P.M   25 L/min
(6.6 GPM)
 25 L/min
(6.6 GPM)
 25 L/min
(6.6 GPM)
 25 L/min
(6.6 GPM)
 33 L/min
(8.7 GPM)
 27 L/min
(7.1 GPM)
 Delivery at 1200 R.P.M   20 L/min
(5.3 GPM)
  20 L/min
(5.3 GPM)
  20 L/min
(5.3 GPM)
  20 L/min
(5.3 GPM)
  27 L/min
(7.1 GPM)
  27 L/min
(7.1 GPM)
 Max Drive Speed  1800 rpm  1800 rpm  1800 rpm  1800 rpm  1800 rpm  1800 rpm
 Min Drive Speed  800 rpm  800 rpm  800 rpm  800 rpm  800 rpm  800 rpm
 Max Pressure  35 kgf/cm²
(500 Psi)
 70 kgf/cm²
(1000 Psi)
 105 kgf/cm²
(1500 Psi)
 140 kgf/cm²
(2000 Psi)
 35 kgf/cm²
(500 Psi)
 70 kgf/cm²
(1000 Psi)
 Weight  9 Kg  9 Kg  9 Kg  9 Kg  9 Kg  9 Kg

Nachi – VDR – Variable Volume Vane Pump – Datasheet

Additional Information

Hydraulic Pump Units

Vane Pump

Manufacturer

Nachi

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