Cast iron piston compressor WK1500-10/500P input power 7.5 kW, intake 1,400 l/min, pressure 10 bar, air receiver 500 l, voltage 400/50 V/Hz

Product detailed description

WALTER Cast-Iron Piston Compressor - WK1500-10/500P

The WK1500-10/500P is the machine with the highest delivery in the entire WALTER range: a 4V four-cylinder cast-iron unit with a power input of 7.5 kW, intake of 1,400 l/min, effective delivery of 1,100 l/min at 10 bar and a 500 l horizontal tank. At the same time, it has the lowest RPM among the 10 bar models – the unit runs at 768 rpm, which is 134 rpm less than the 5.5 kW class (902 rpm) and 508 less than the entry-level 2.2 kW class (1,276 rpm).

This is no longer just a workshop compressor, but a compressed air source for the entire operation. A delivery rate of 1,100 l/min can handle continuous sandblasting, three simultaneous draw-offs, or a fixed distribution system across the entire hall. Power supply 400 V / 50 Hz, open design with full service access, noise level approx. 80 dB(A), 3-year warranty after registration at waltercesko.cz.

Configuration of this machine

• Cast-iron unit — 4V · 768 rpm · single-stage compression
• Pressure vessel — 500 l · horizontal
• Horizontal design
• Three-phase 400/50 V/Hz
• Standard pressure of 10 bar for common pneumatic tools

Why choose this model

Who is it for

It is purchased by operations where compressed air is not just an aid, but part of the production process: continuous-duty sandblasting or blasting booths, assembly stations with multiple pneumatic tools running simultaneously, or metal fabrication with a fixed distribution system across the entire hall and multiple people per shift. Typically, it is a machine installed in a separate plant room or compressor room, hard-wired, where the operator only knows it is running by the sound behind the wall. For a workshop with two people and irregular demand, it is an unnecessarily large investment in a machine that will never be fully utilised.

Typical applications

• Continuous sandblasting and blasting with a 3 mm nozzle
• Two pneumatic angle grinders simultaneously (800 to 1,200 l/min)
• Central source for a fixed distribution system in a hall with multiple take-off points
• Assembly stations with pneumatic clamping and tools in shift operation
• Metal fabrication with the concurrent use of three or more tools whose operation cannot be staggered in time
• Operations with long working cycles where the machine runs for hours at a time

Where to choose a different model

What the figures tell you — calculated values

The values are calculated and are meant for comparing the models with each other, not as guaranteed figures.

Design and technology

Related models and alternatives

Frequently asked questions

What does the 4V designation mean and why does this machine have four cylinders?

Four cylinders arranged in two V-pairs. Smaller models have two cylinders in a V (2V designation) or three in a W (3W). The more cylinders, the smaller the volume per stroke and the smoother the compression – four smaller pulses per revolution instead of two large ones. Opposing pairs further balance the inertial forces. This allows the speed to be reduced to 768 rpm without the risk of harsh operation.

Does 768 rpm mean this machine is less noisy than smaller models?

All models in the series have the same figure of approximately 80 dB(A), so not on paper. In reality, however, the lower speed affects the sound character – it is deeper and more consistent than that of high-speed units operating in the thousand-rpm range. The machine is an open design without a noise enclosure, so expect to use hearing protection if placed next to a workstation. A separate compressor room is ideal.

Can it handle continuous sandblasting?

Yes, that is one of the primary reasons this class is purchased. A sandblasting gun with a 3 mm nozzle consumes 500 to 1,000 l/min in continuous operation depending on settings, and the 1,100 l/min delivery provides a reserve even after accounting for distribution losses. The half-cubic metre tank further dampens pressure fluctuations when opening and closing the gun. In smaller classes of the series, sandblasting is only possible in short bursts from the tank.

Why is the delivery-to-intake ratio lower for this model than for smaller machines?

The difference is smaller than it may seem: 1,100 out of 1,400 l/min is about 79%, while the other 10-bar platforms in the range sit between 81 and 87%. When sizing tools, always go by the delivery of 1,100 l/min; the intake of 1,400 l/min only identifies the model.

How long does it take to fill the 500 l air tank and how often does the motor switch on?

The calculation gives approximately 4.5 minutes from zero to 10 bar with no air being drawn – the fastest of all models with a half-cubic-metre tank. In operation, however, the machine only repressurises by 2 bar between the cut-in and cut-out pressure, which is about 1,000 litres of free air per cycle. With a continuous draw of 500 l/min, this results in roughly 16 motor starts per hour. The values given are our own calculation, not a figure from the data sheet.

The machine comes with a 3-year warranty after registration with the importer. Warranty terms, the maintenance schedule and a comparison of all 28 models are in the category WALTER cast-iron piston compressors.