Cast iron piston compressor VWK900-7-5/270P input power 5.5 kW, intake 880 l/min, pressure 10 bar, air receiver 270 l, voltage 400/50 V/Hz
Code: VWK900-7-5/270P
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Product detailed description
WALTER VWK900-7,5/270P Vertical Cast-Iron Piston Compressor
The VWK900-7,5/270P is the most powerful vertical compressor in the entire WALTER range. The 3W three-cylinder cast-iron unit has a power input of 5.5 kW (7.5 HP), an intake of 880 l/min and an effective delivery rate of 740 l/min at 10 bar, with speeds of 902 rpm. The vertical tank holds 270 l; power supply 400 V / 50 Hz, noise level approx. 80 dB(A).
No vertical version exists above this class – anyone requiring more than 740 l/min must consider a horizontal machine or a unit on a frame with a separately placed tank. A capacity of 270 l is the maximum available in a vertical design; the same volume is also found in the VWK650-5,5/270P one class lower. Warranty of 3 years after registration at waltercesko.cz.
Configuration of this machine
- Cast-iron unit — 3W · 902 rpm · single-stage compression
- Pressure vessel — 270 l · vertical
- Vertical design — Vertical tank — smaller floor footprint
- Three-phase 400/50 V/Hz
- Standard pressure of 10 bar for common pneumatic tools
Why choose this model
The pinnacle of vertical design
740 l/min is the highest effective delivery available in a vertical version within the WALTER range. The 7.5 kW class (WK1500 platform) simply doesn't exist in a vertical version – if you need high performance and a small footprint simultaneously, this is the limit.
Three-cylinder at 902 rpm
The 3W unit distributes compression across 3 cylinders in a W-configuration and runs at 902 rpm, well below 1,000. A lower mean piston speed means a shorter ring sliding distance per hour of operation and lower heat production – a feature you will only come to appreciate after several years of service.
740 l/min covers two workstations
Out of 880 l/min of intake air, 740 l/min flows into the distribution system, which is approximately 84%. Per 1 kW of power input, this equates to 134.5 l/min. Practically, this means one pneumatic grinder in continuous operation, plus a second person using an impact wrench, blow gun, or ratchet.
270 l vertical capacity
The vertical tank has a capacity of 270 l – the same as the VWK650-5,5/270P one class lower and more than the 90 l tanks found in the 2.2 and 3.0 kW vertical classes. With a difference of 2 bar between the switching-on and switching-off pressures, you get approximately 540 l of free air per cycle; at a continuous draw of 300 l/min, this results in about 20 motor starts per hour. Filling an empty tank to 10 bar takes approximately 3.6 minutes according to our calculations.
Who is it for
It is purchased by metal fabrication shops, metalworking shops, or service halls with two workstations where the floor plan is designated for materials, pallets, and handling, and the compressor is allocated to a strip along the wall. Typically an operation that has outgrown a 4.0 kW machine, but has no reason or space to go up to 7.5 kW. 740 l/min will support one continuous tool plus a second worker, but not two grinders at full load.
Typical applications
- Pneumatic angle grinder in continuous operation and a second worker with an impact wrench or blow gun
- Pneumatic chisel and needle scaler for preparing welds and surfaces
- Pneumatic clamping, handling cylinders, and control of fixtures in production
- Painting larger parts with an HVLP spray gun
- Inflating, blowing off, and cleaning machines, moulds, and extraction paths
- Central air source for a smaller workshop with several take-off points
Where to choose a different model
You need more than 740 l/min continuously – two grinders simultaneously or sandblasting with a larger nozzle
A vertical version does not exist at this performance level. Opt for the horizontal WK1500-10/500P with 7.5 kW, 1,100 l/min and a four-cylinder unit at 768 rpm. Expect a significantly larger floor footprint.
You need a larger air reserve than 270 l provides
The horizontal WK900-7,5/500P features the same unit and the same 740 l/min, but a 500l tank – nearly double the reserve and fewer motor starts. You will pay for this with the required floor space.
You have a low ceiling or low doors
The most powerful vertical model in the range extends upwards. The horizontal WK900-7,5/270P offers the same 740 l/min with the same 270l tank on wheels and fits even where overhead space is limited.
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
WK900-7,5/270P
The horizontal counterpart with the same unit and the same 270l tank on wheels.
WK900-7,5/500P
The same 740 l/min with a 500l tank – the largest capacity in this power class.
VWK650-5,5/270P
One class lower in vertical design: 4.0 kW, 550 l/min and the same 270l vertical tank.
WK1500-10/500P
The range's peak for demands exceeding 740 l/min – 7.5 kW and 1,100 l/min, but only available in horizontal design.
Frequently asked questions
- I have encountered the designation VWK900-7,5/500P. Is it a different machine?
- No. The correct designation for this compressor is VWK900-7,5/270P and the vertical tank has a volume of 270 l. The designation with the number 500 appeared by mistake for the vertical model; the 500l tank is found on the horizontal WK900-7,5/500P with the same unit and the same delivery rate of 740 l/min.
- Is a vertical design available in the top 7.5 kW class?
- It is not. The 7.5 kW platform (WK1500) is only available as a horizontal machine with a 500l tank or as a separate unit on a base frame. This model therefore represents the power ceiling for the vertical design within the entire WALTER range.
- Can it support two workstations simultaneously?
- It depends on the equipment being operated. A pneumatic angle grinder consumes 400 to 600 l/min continuously, so two grinders running at once would exceed the 740 l/min delivery rate when considering a recommended 30% reserve for leaks. A grinder plus an impact wrench, blow gun, or ratchet used intermittently are perfectly fine.
- Why does this machine have three cylinders while the weaker WK650 only has two?
- The cylinder configuration is not a direct measure of power. The WK900 platform achieves an intake of 880 l/min using three cylinders in a W-configuration at 902 rpm, while the WK650 manages 630 l/min with two cylinders of a larger bore at 993 rpm. This alternates throughout the range: WK430 has two cylinders, WK550 three, WK650 two, WK900 three, and WK1500 four.
- What should I look out for during installation?
- As the most powerful vertical machine in the range, it requires a level, solid floor without shimming individual feet and must be anchored according to the manual if used alongside handling equipment. Leave sufficient space around the unit for cooling, size the 400 V supply according to the power input, and ensure the condensate drain at the bottom of the tank is accessible – for a 270 l tank in continuous operation, this is a weekly task.
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.
Ventilek’s tip
The most powerful machine in the range that can go against a wall. Two workstations on less floor than a wardrobe.
Additional parameters
| Category: | Air compressors |
|---|---|
| Warranty: | 3 years |
| EAN: | 5905122000196 |
| Compressor type: | Piston compressor |
| Pressure: | 10 bars |
| Suction power: | 880 l/min |
| Air delivery: | 740 l/min |
| Pressure vessel volume: | 270 L |
| Design of pressure vessel: | Standing |
| 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: | 650 × 700 × 1800 mm |
| Weight: | 195 kg |
| Accessories: | Pressure regulator, Wheels, Handle, Quick coupler, Ball cock |
| Engine: | Electric |
| Soundproofed: | No |
| Drive: | V-belts |
| Air dryer: | No |
| Retrieved from: | Professional |
| Development: | Mobile |
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