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Nachi PZS - Variable Volume Piston 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.

Description PZS-3B-*- 70* PZS-4B-*-100* PZS-5B-*-130* PZS-6B-*-180* PZS-6B-*-220*
Pump Capacity  4.27 in³/rev  6.10 in³/rev 7.93 in³/rev  10.98 in³/rev  13.42 in³/rev
Rated Pressure 21 MPa (3000 PSI)  21 MPa (3000 PSI)  21 MPa (3000 PSI)  21 MPa (3000 PSI)  21 MPa (3000 PSI)
Maximum Working Pressure  28 MPa (4085 PSI)   28 MPa (4085 PSI)   25 MPa (3642 PSI)   25 MPa (3642 PSI)   25 MPa (3642 PSI)
Min Revolution Speed  500 min¹  500 min¹  500 min¹  500 min¹  500 min¹
Max Revolution Speed  1800 min¹  1800 min¹  1800 min¹  1800 min¹  1800 min¹
Weight  37 Kg  58 Kg  86 Kg  123 Kg  126 Kg

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Vat Reg Number: 846644204 Company Registration Number: 5230249

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