Cast iron piston compressor HWK700-5-5/270P input power 4 kW, intake 600 l/min, pressure 13 bar, air receiver 270 l, voltage 400/50 V/Hz

Product detailed description

WALTER HWK700-5,5/270P - High-Pressure Cast-Iron Piston Compressor, 13 bar

HWK700-5,5/270P is the high-pressure version of the WALTER 4.0 kW platform. The cast-iron twin-cylinder 2V with a 4.0 kW (5.5 HP) power input draws in 600 l/min, delivers an effective 500 l/min to the system, and compresses it up to 13 bar. The unit operates at 817 rpm, is mounted on a 270 l horizontal tank, and is powered by 400 V / 50 Hz. Noise level approx. 80 dB(A), 3-year warranty after registration at waltercesko.cz.

This machine is not bought for air volume – in fact, it has less than its ten-bar sibling. It is bought for the pressure: for equipment that specifies a minimum of over 10 bar in the manual, below which it either does not work or works poorly. If your tools run on 8 bar, do not buy this model – with the same 4.0 kW power input, you will get 50 l/min more with the WK650-5,5/270P.

Configuration of this machine

• Cast-iron unit — 2V · 817 rpm · single-stage compression
• Pressure vessel — 270 l · horizontal
• Horizontal design
• Three-phase 400/50 V/Hz
• High-pressure version — 13 bar — for applications requiring more than 10 bar

Why choose this model

Who is it for

The typical buyer is an engineering workshop or a production plant where, alongside standard tools, a specific piece of equipment with higher pressure requirements is operated – such as a pneumatic press, clamping fixture, test bench, or diaphragm pump. You will not find enough air for two workstations here; 500 l/min is roughly sufficient for one continuous draw plus short-term peaks. The deciding criterion is not the number of people in the workshop, but whether you operate a machine that does not function below 10 bar.

Typical applications

• Pressure testing of pipelines, hoses, and fittings up to 13 bar
• Pneumatic presses, riveting and pressing fixtures with a prescribed pressure above 10 bar
• Clamping and positioning fixtures in mechanical engineering production
• Diaphragm pumps and other equipment with higher operating pressures
• Long workshop pipelines where a pressure reserve is needed to offset piping losses
• Standard pneumatic tools via a pressure regulator set to 6–8 bar

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

Why does the high-pressure model have a lower delivery rate than the ten-bar model?

Because compressing air to a higher pressure requires more work. The motor has the same 4.0 kW, so when it has to push air against 13 bar instead of 10, it manages less per minute: 500 l/min instead of 550. Therefore, you acquire higher pressure in exchange for volume, not as an additional bonus.

Can I use this compressor to fill breathing or diving cylinders?

No. It is an oil-lubricated single-stage industrial compressor for 13 bar. Breathing air is filled using special multi-stage compressors at 200 to 300 bar with prescribed filtration and air quality certification. Using this machine to fill breathing apparatus is dangerous and impermissible.

Can I connect standard tools operating at 8 bar?

Yes, via the pressure regulator at the outlet, which is included as standard equipment. The tank holds 13 bar; you release as much into the hose as the tool can handle. Just ensure that the hoses, quick couplings and any distribution piping are rated for the tank pressure, not only for the pressure after the regulator.

How long does it take to fill a 270 l tank to 13 bar?

The calculation gives approximately 7.0 minutes from zero to full pressure without consumption; actual filling times may be slightly longer. During operation, however, the tank only repressurises between the cut-in and cut-out pressures, which is a matter of tens of seconds.

Why is the number 700 used in the designation when the intake is 600 l/min?

For HWK high-pressure models, the number in the code is a nominal series designation, not a parameter – unlike WK models, where the number corresponds to the approximate intake. The actual values for this machine are an intake of 600 and an effective delivery of 500 l/min. For the same reason, the product's web address contains the historical designation hwk650.

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.