Cast iron piston compressor WK550-4-0/200P input power 3 kW, intake 530 l/min, pressure 10 bar, air receiver 200 l, voltage 400/50 V/Hz

Product detailed description

WALTER WK550-4,0/200P Cast-Iron Piston Compressor

The WK550-4,0/200P is a balanced mid-range option in the three-kilowatt class: a 3W cast-iron triple-cylinder with a power input of 3.0 kW, an intake of 530 l/min, and an effective delivery of 440 l/min at 10 bar, with a unit speed of 1,202 rpm. It features a 200 l horizontal tank, three-phase 400 V / 50 Hz power supply, noise levels of approx. 80 dB(A), and a 3-year warranty upon registration at waltercesko.cz.

The 200 l tank, paired with a 530 l/min intake, falls within the recommended reserve-to-performance ratio (160 to 270 l), making this model the first horizontal configuration in its class where the tank size truly matches the unit's output. The result is a machine capable of more continuous work: at a constant draw of 200 l/min, the motor switches approximately 16 times per hour, which is half as often as the 100 l version.

Configuration of this machine

• Cast-iron unit — 3W · 1,202 rpm · single-stage compression
• Pressure vessel — 200 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 most commonly purchased by single-bay auto repair shops, smaller body shops, metalworking shops, or metal fabrication shops where one person works with compressed air for a significant part of the shift. It is also suitable for joinery workshops using a mix of staplers, grinders, and blow-off guns. It is a versatile workshop machine: powerful enough for most pneumatic tools, large enough to avoid constant cycling, yet remaining manageable in size. However, there is a ceiling for two people working simultaneously — the simultaneous draw of two continuous loads requires a higher class.

Typical applications

• 1/2" impact wrench and blow gun in a single-bay car repair shop
• Orbital sander or chipping hammer in a body shop
• HVLP spray gun for touch-ups and smaller parts
• Pneumatic clamping, drills and ratchets in metalworking
• Staplers, sanders and blow guns in a joinery
• Fixed air distribution system with several outlets for non-simultaneous use

When 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

How many tools can it power simultaneously?

One continuous draw with a reserve, or one continuous and one short draw. Only sum the tools that will actually run simultaneously and continuously, add 30% for leaks in the distribution system, and compare this with the delivery rate of 440 l/min. An impact wrench and a blow gun, which are never used at the same time, are not part of the sum — these are covered by the tank.

How long does it take to fill the 200 l tank?

The calculation gives approximately 4.5 minutes from zero to 10 bar without draw. During a typical day, however, the tank is only topped up by 2 bar from the cut-in to the cut-out pressure, which takes tens of seconds. This is an isothermal estimate; in reality, filling usually takes slightly longer.

Is there a noticeable difference between 200 and 270 litres?

In terms of the number of starts, yes: at a draw of 200 l/min, the 200 l tank results in approximately 16 cycles per hour, while the 270 l tank takes about 12. Nothing changes in terms of performance — both versions have the same unit and the same 440 l/min. Decide based on how long the machine runs and how much space you have.

Why does a three-kilowatt machine have three cylinders, while the more powerful four-kilowatt one has only two?

This is not a data error. The WK550 platform achieves its volume with three smaller cylinders in a W-configuration at 1,202 rpm, whereas the more powerful WK650 platform uses two larger cylinders and lower speeds of 993 rpm. Both paths lead to the goal: the three-cylinder provides smoother operation and less pulsation, while the two-cylinder with lower speeds results in a shorter piston ring slide path per hour of operation.

Can it handle a spray gun in continuous operation?

It can. An HVLP gun draws 250 to 400 l/min and the machine's delivery rate is 440 l/min, so the unit handles even the upper limit of consumption. The 200 l tank further smooths out pulsations, ensuring the spray does not fluctuate. For painting, however, add filtration and a dryer after the compressor outlet — these are not included in the delivery.

How often should condensate be drained from this tank?

At least once a week, or more frequently in continuous operation. Water accumulated in the pressure vessel is the fastest route to internal corrosion, and draining is part of the mandatory maintenance upon which the validity of the 3-year warranty depends. At the same time, blow out the air filters once a month — the new generation metal insert can withstand this repeatedly.

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.