Cast iron piston compressor WK900-7-5/500P power input 5.5 kW, suction capacity 880 l/min, pressure 10 bar, air receiver 500 l, voltage 400/50 V/Hz
Code: WK900-7-5/500P
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Product detailed description
WALTER Cast Iron Piston Compressor - WK900-7.5/500P
WK900-7,5/500P is the 5.5 kW class version with the largest pressure vessel: a 3W three-cylinder cast iron unit, power input 5.5 kW, intake 880 l/min, effective delivery 740 l/min at 10 bar and 902 rpm, mounted on a 500 l horizontal receiver. It does not differ from the 270 l tank variant by a single unit parameter – it only differs in how much air the machine has available before the motor must switch on. Power supply 400 V / 50 Hz, noise level approx. 80 dB(A), 3 years warranty after registration at waltercesko.cz.
A half-cubic metre reserve is not bought for power, but for distribution stability. A 500 l receiver delivers approximately 1 000 litres of free air per cycle at a typical two-bar switch differential, which is double that of the version with a 270 l tank. This is a machine for a workshop with a fixed distribution system, more delivery points, and peak surges – where average consumption is not the concern, but that minute when everyone draws air at once.
Configuration of this machine
Why choose this model
The difference between the cut-in and cut-out pressure is typically 2 bar. A 500 l tank delivers approximately 1 000 litres of free air over this range, whereas a 270 l tank delivers only 540 litres. This is not about higher power – it is a larger buffer tank situated between your tool and the unit, cushioning every consumption surge before it manifests as a pressure drop on the gauge.
With a continuous draw of 300 l/min, a 500 l tank lasts about 3.3 minutes and refilling takes 2.3 minutes – the total cycle is therefore approximately 5.6 minutes, resulting in roughly 11 starts per hour. The same unit on a 270 l tank has about 20 starts under identical conditions. A piston compressor does not wear down from engine hours, but from starts: every start-up is a current peak and a moment when the lubrication film is at its thinnest.
Tools that draw more than the machine provides are not automatically excluded – it is a matter of how long they run. At a draw of 1 000 l/min, there is a deficit of 260 l/min, which is drawn from the tank: from 500 l you can sustain this for approximately 3.8 minutes, from 270 l only 2.1 minutes. That is the difference between whether you can blast the whole part in one go or have to wait halfway through.
An intake of 880 l/min divided among three cylinders in a W-configuration ensures a smaller displacement per cylinder, a smoother compression cycle, and a better-balanced crankshaft mechanism. The speed of 902 rpm is approximately 25% lower than the 1 202 rpm of the 3.0 kW class – with a comparable piston stroke, this means a proportionally shorter sliding distance of the piston ring per hour of operation.
Design and technology
Piston, rings and cast-iron liner
The cast-iron cylinder liner and piston rings are standard service parts — the unit can be refurbished after years of use rather than discarded.
Intake filter with steel mesh
The new generation metal insert withstands repeated blowing out with compressed air, whereas a paper insert would tear after a few cleanings.
Head gaskets and valves
The redesigned cylinder head gaskets maintain pressure even after thermal cycles; valve plates are stocked as spare parts.
Inspection on a 3D measuring machine
Key dimensions of the unit are verified on a coordinate measuring machine — this ensures that parts from different series fit together perfectly.
Technical data WK900-7.5/500P
What the data sheet doesn't tell you — calculated values
Values are calculated from manufacturer parameters and serve for comparing models with each other, not as a guaranteed figure.
Who is it for
It is ideal for workshops with fixed piping and multiple discharge points where exact consumption cannot be planned: metalworking with a batch-used sandblasting box, a body shop with two bays and a preparation area, or a joinery with several machines on a single circuit. The common factor is that the machine is intended to remain in one place, be hard-wired, and not require daily manual intervention. Conversely, those who move the compressor around the workshop or lack the floor space for a 500 l tank will be more satisfied with the 270-litre version.
Typical applications
- Central source for fixed piping with three or more discharge points
- Batch sandblasting and blasting – the 500 l reserve covers peaks exceeding 740 l/min for several minutes
- Body shop: grinder, cutter, and blow-off gun on a single circuit without pressure drops
- Paint shop with an HVLP spray gun in continuous operation, without pressure pulsations
- Metalworking with pneumatic clamping and tools that are triggered irregularly
- Operations where the machine is located in a separate room and the piping runs across the entire hall
Where to choose a different model
The tank cannot compensate for a permanent shortage; it only delays it by a few minutes. Opt for the four-cylinder 7.5 kW class with a delivery rate of 1,100 l/min on the same 500 l tank – it provides sufficient reserve even for a 3 mm nozzle in continuous operation.
View recommended model →A horizontal 500 l tank occupies a significant footprint. The vertical version of the same 5.5 kW unit stands on a 270 l receiver, reducing the footprint by approximately half. The trade-off is a smaller reserve: instead of 1,000 litres of free air per cycle, you get approximately 540.
View recommended model →Do not buy a second one. The 5.5 kW unit alone on a base frame can be connected to your existing tank – the inspection and certification remain your responsibility; we will confirm the scope of delivery by phone.
View recommended model →Service and maintenance to maintain the warranty
Inspections may be carried out by an authorised WALTER service centre or by yourself — provided that original parts and fluids are used and proof of purchase is retained.
3 year WALTER warranty
36 months after registration at waltercesko.cz
The warranty is provided by Walter Kompressortechnik Česko s.r.o. (Ostrava). Machine registration extends the warranty to 36 months from the date of purchase; proof of purchase is required to claim the warranty.
- Claim assessment within 14 working days, approved repairs free of charge and completed within 30 days
- After 4 repairs and a further defect, you are entitled to a replacement of the machine with a fault-free one
- You may perform the prescribed inspections yourself — using original parts and providing proof of purchase
Transport and Commissioning
The machine is delivered on a pallet. Before the first start, check the oil level, direction of rotation, and the tightness of connections; after the first 8 hours of operation, tighten the cylinder head bolts to a torque of 25 Nm. Leave the electrical connection to a professional — for three-phase machines, it is necessary to verify the correct phase sequence.
Related models and alternatives
Same 5.5 kW unit on a smaller 270 l tank: smaller footprint, wheels, but approximately double the number of motor starts.
View model →Same 500 l tank, but a four-cylinder 7.5 kW unit with a delivery rate of 1,100 l/min at 768 rpm.
View model →Vertical version of the 5.5 kW unit with a 270 l receiver – saves floor space where there is no room for a horizontal tank.
View model →When the technology requires 13 bar: 960 l/min at 725 rpm on the same 500 l tank.
View model →Frequently asked questions
What specifically do I gain with a 500 l tank when the pump is identical to the 270P version?
Can it handle sandblasting?
How long does it take to fill the 500 l air receiver?
How much condensate accumulates in a half-cubic metre tank?
Can I move it around the workshop?
Additional parameters
| Category: | Compressors for all applications - hobby and industrial |
|---|---|
| Warranty: | 3 years |
| EAN: | 5905122000158 |
| Compressor type: | Piston compressor |
| Pressure: | 10 bars |
| Suction power: | 880 l/min |
| Displacement: | 740 l/min |
| Pressure vessel volume: | 500 L |
| Design of pressure vessel: | Lying down |
| Connecting: | Quick coupling DN 7.2, Ball valve 1/2" |
| Motor power: | 5.5 kW |
| Mains voltage: | 400/50 V/Hz |
| Speeds: | 902 rpm |
| Number of cylinders: | 3 |
| Number of grades: | 1 – single-stage compressor |
| Lubrication: | Oleic |
| Noise: | 80dB(A) |
| Dimensions: | 2000 × 610 × 1250 mm |
| Weight: | 253 kg |
| Accessories: | Pressure regulator, Wheels, Handle, Quick coupler, Ball cock |
| Engine: | Electric |
| Soundproofed: | No |
| Drive: | V-belts |
| Air dryer: | No |
| Retrieved from: | Professional |
| Development: | Stationary |
| In stock: | External warehouse |
Demonstrace výkonu litinového pístového kompresoru GK880-55-500 💪🏭
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