Cast iron piston compressor WK650-5-5/270P input power 4 kW, intake 630 l/min, pressure 10 bar, air receiver 270 l, voltage 400/50 V/Hz
Code: WK650-5-5/270P
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Product detailed description
WALTER WK650-5,5/270P - Cast-Iron Piston Compressor
The WK650-5,5/270P is the perfect middle ground of the WALTER range: a full cast-iron 2V twin-cylinder with a power input of 4.0 kW, intake of 630 l/min and an effective delivery of 550 l/min at a pressure of 10 bar. The unit speed drops to 993 rpm — the first in the range to go below one thousand. The air tank has a capacity of 270 l, the machine weighs 163 kg, and the dimensions are 1,650 × 660 × 1,150 mm. The machine comes with a 3-year warranty after registration at waltercesko.cz.
This combination covers the most common demands of car repair shops, paint shops, and metal fabricators: one person works continuously, another occasionally uses an impact wrench, and the compressor handles it without waiting for repressurisation. The drop in speed to below 1,000 rpm means a longer service life and less wear than with high-speed machines of comparable power.
Configuration of this machine
- Cast-iron unit — 2V · 993 rpm · single-stage compression
- Pressure vessel — 270 l · horizontal
- Horizontal design
- Three-phase 400/50 V/Hz
- Standard pressure of 10 bar for common pneumatic tools
Why choose this model
Speeds below 1,000 for the first time
993 rpm is the threshold beyond which a piston compressor behaves differently: the ring sliding distance per hour of operation is shorter and the head temperature is lower. Compared to the entry-level class of the range, which runs at 1,276 rpm, the unit reduces its speed by nearly a quarter while delivering 60% more air.
550 l/min supports continuous demand and peak loads from a second user
An effective delivery of 550 l/min covers one continuous workstation — such as an orbital sander, spray gun, or pneumatic chisel — plus the peak requirements of a second user. For two truly continuous demands, the 5.5 kW class with 740 l/min is required.
270 litres of reserve maintain pressure during painting
With a switching differential of 2 bar, the 270 l tank provides approximately 540 litres of free air per cycle. This is sufficient to ensure the spray gun receives stable pressure even when the motor is not running — which is crucial for surface quality in painting.
The foundation for three other variants
The same unit is used in the vertical VWK650-5,5/270P (saves floor space), the high-pressure HWK700 for 13 and 15 bar, and the standalone WK650P-PLATE unit on a base frame. The service parts are therefore common to all of them.
Who is it for
A typical buyer is a car repair shop or tyre shop where one mechanic works continuously and another uses an impact wrench only occasionally. It is equally suitable for paint shops, where pressure stability is key, and for metal fabrication for grinding and chiselling. It is undersized for the simultaneous continuous operation of two workstations or for sandblasting — for those applications, the 5.5 or 7.5 kW class is appropriate.
Typical applications
- HVLP spray gun during painting — stable pressure throughout the spraying process
- 1/2" impact wrench in a tyre shop, wheel by wheel
- Orbital sander for surface preparation
- Pneumatic chisel and needle scaler
- Blowing and cleaning parts with compressed air
- Blowing in optical cables (FTTH) for shorter sections
Where to choose a different model
Two people will be working simultaneously and continuously
For two continuous draws, you need 740 l/min. The 5.5 kW class can handle this while running even slower — 902 rpm.
You have no space to place the machine
The vertical version has the same unit and the same 270 l tank, just positioned upright — saving roughly half of the floor space.
Your equipment requires more than 10 bar
The high-pressure HWK700 version delivers 13 or 15 bar. The delivery rate is lower (500 or 470 l/min respectively) — higher pressure comes at the cost of volume.
Compression time — measured on a real machine
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
VWK650-5,5/270P
Same unit and tank, just upright — for workshops with limited floor space.
WK900-7,5/270P
A class higher: three-cylinder, 740 l/min and 902 rpm — for two continuous draws.
HWK700-5,5/270P
High-pressure version at 13 bar for applications where 10 bar is insufficient.
WK650P-PLATE
Just the unit on a base frame, if you already have a pressure vessel.
Frequently asked questions
- Why 5,5 in the designation when the input power is 4 kW?
- The number after the hyphen is the motor power in horsepower: 5.5 HP corresponds to an input power of 4.0 kW. The number 650 before it is the approximate intake in litres per minute (actually 630) and 270 after the slash is the tank volume.
- Can it handle a spray gun when painting a whole car?
- Yes. An HVLP gun consumes approximately 300 to 400 l/min, the machine's delivery rate is 550 l/min and the 270 l tank smooths out the peaks. When painting a larger part without interruption, the motor will cycle, but the pressure will not drop below the working value.
- How long does it take to fill an empty tank?
- Approximately 4.9 minutes from zero to 10 bar without draw. In normal operation, however, it only refills by 2 bar from the cut-in pressure to the cut-out pressure, which is a matter of less than a minute.
- Is 80 dB(A) a lot?
- This value is comparable to the entire WALTER range and corresponds to a piston compressor without a soundproof cabinet. In a workshop where the machine operates intermittently, this is not an issue; however, if you need to work beside it all day, we recommend placing it in a separate room or behind a partition.
- What is required for commissioning?
- Check the oil level, verify the phase sequence (the motor must rotate in the indicated direction), and 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.
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
Under a thousand rpm, a piston compressor behaves like a grown-up: it runs cooler and lasts longer. The whole range revolves around this machine.
Additional parameters
| Category: | Air compressors |
|---|---|
| Warranty: | 2 years |
| EAN: | 5905122000134 |
| Compressor type: | Piston compressor |
| Pressure: | 10 bars |
| Suction power: | 630 l/min |
| Air delivery: | 550 l/min |
| Pressure vessel volume: | 270 L |
| Design of pressure vessel: | Lying down |
| Connecting: | Quick coupling DN 7.2, Ball valve 1/2" |
| Motor power: | 4.0 kW |
| Mains voltage: | 400/50 V/Hz |
| Speeds: | 993 rpm |
| Number of cylinders: | 2 |
| Number of grades: | 1 – single-stage compressor |
| Lubrication: | Oleic |
| Noise: | 80dB(A) |
| Dimensions: | 1650 × 660 × 1150 mm |
| Weight: | 163 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 |
| In stock: | External warehouse |
Demonstrace výkonu litinového pístového kompresoru GK630-40-270 💼🌪️
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