Cast iron WK550 aggregate on base frame input power 3 kW, intake 530 l/min, pressure 10 bar, no air receiver, voltage 400/50 V/Hz
Code: WK550-PLATE
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Product detailed description
WALTER WK550P-PLATE cast-iron compressor unit on base frame
The WK550P-PLATE is a standalone three-cylinder cast-iron unit mounted on a base frame, supplied without a pressure vessel. The 3W version with a power input of 3.0 kW (4 HP) has an intake of 530 l/min, delivers 440 l/min to the distribution system at 10 bar, and operates at 1,202 rpm. 400 V / 50 Hz power supply, V-belt drive, noise level approx. 80 dB(A), 3-year warranty after registration at waltercesko.cz.
It is the smaller of the two three-cylinder units available – and this is particularly important for setups without a tank, as there is no heavy tank to dampen vibrations. It is chosen by users building their own custom setup with higher requirements for even running, or by those replacing a worn-out unit on a compressor with a 200 to 270 l tank.
Configuration of this machine
- Cast-iron unit — 3W · 1,202 rpm · single-stage compression
- Unit on base frame — supply your own vessel
- Orientation set by your own tank
- Three-phase 400/50 V/Hz
- Standard pressure of 10 bar for common pneumatic tools
Why choose this model
Three cylinders in a W-configuration – more even running without the damping mass of a tank
Distributing compression across three cylinders means a more uniform torque curve and lower pulsation than a twin-cylinder unit. On a standard compressor, vibrations are absorbed by the heavy tank; for a frame-mounted unit installed, for example, on anti-vibration pads or in a cabinet, even running with less vibration is a significantly more valuable feature.
440 l/min – air for one continuous-duty tool
Of the 530 l/min intake, 440 l/min reach the distribution system, which is approximately 83%. This is sufficient for an impact wrench or a spray gun in continuous operation, or for two tools used alternately. Choose a tank in the range of approximately 200 to 270 l for this setup.
1,202 rpm instead of 1,276
Compared to the smallest class, the speed decreases only slightly, but delivery increases by 100 l/min. This unit is therefore the right choice when the setup must operate for more than a few continuous minutes, yet you wish to avoid the higher power and fusing requirements of the 4.0 kW class.
Place the tank wherever you need it
The frame-mounted unit can be installed in a separate room, a cabinet, or on a wall bracket, leaving the tank elsewhere. This simultaneously solves noise and floor space issues – provided there is a free supply of cooling air to the finned unit and sufficient access for maintenance.
Who is it for
It is suitable for smaller workshops and service centres where a compressor with a good tank is already in place but the unit has reached the end of its life, as well as for companies building a custom air source – for example, in a separate compressor room to keep the noise behind closed doors. It is assumed that the connections, pressure switch, and fusing will be handled by you or your technician. Those seeking a ready-made solution without the need for assembly should opt for the complete WK550-4,0/270P machine.
Typical applications
- Replacement of a worn-out unit on a compressor with a 200–270 l tank
- Separate compressor room or a soundproof cabinet with the tank on the shop floor
- Custom assembly for a tyre shop or a single-bay auto repair shop
- Supplementary source for an existing distribution system to cover peak demands
- Integration into a machine or process installation with its own pressure vessel
- Mobile service unit with its own tank on a chassis
When to choose a different model
You want a complete machine that you can simply set up and switch on
The WK550-4,0/270P features the same three-cylinder unit on a 270 l horizontal tank, including a regulator, wheels, and a quick coupler. This eliminates the need for vessel inspection and interconnecting.
The assembly needs to run for long hours continuously
Opt for the WK650P-PLATE – 993 rpm and 550 l/min. It is the smallest unit in the range that runs below 1,000 rpm, which is precisely what makes it a machine for continuous operation.
You require less air
The smaller WK430P-PLATE delivers 340 l/min at an input of 2.2 kW. This is sufficient for blow-off, ratchets, and staplers in intermittent operation.
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
WK550-4,0/270P
Complete machine with the same three-cylinder unit and a 270 l tank – the fewest motor starts in this class.
WK550-4,0/200P
The same unit on a 200 l tank – a more compact version of the complete machine.
WK650P-PLATE
One class higher: 4.0 kW, 550 l/min and 993 rpm – a compressor unit designed for continuous operation.
WK430P-PLATE
The smallest class of frame-mounted units: 2.2 kW and 340 l/min, with lower requirements for both tank and fusing.
Frequently asked questions
- Why does the product URL look like that of a compressor with a hundred-litre tank?
- This is a legacy of the older GK numbering system and is a potential pitfall we want to clarify immediately: this product is a unit on a base frame without a tank. The complete machine with a 100 l tank is the WK550-4,0/100P and has its own page. Please refer to the order code WK550P-PLATE, not the URL.
- Why does the smaller machine have three cylinders when the larger WK650 only has two?
- This is not an error. The higher WK650 class achieves greater volume through a different approach – larger bores and lower speeds (993 vs 1,202 rpm). The W three-cylinder configuration is used here to achieve performance within a reasonable cylinder size and ensures more even running with less vibration, which is beneficial for a setup without a tank.
- What size pressure vessel should I choose for it?
- As a guideline, 0.3 to 0.5 litres of tank capacity per 1 l/min of intake, which is roughly 160 to 270 l. In practical terms, this means a 200 or 270 l tank. A smaller tank leads to more frequent motor starts, and starting is the primary cause of wear in a piston compressor – therefore, a larger tank is generally preferred.
- What do I need to arrange for the unit myself?
- A pressure tank with a valid inspection (200 or 270 l), a pressure switch, safety and non-return valves, output regulation, and a 400 V power supply with fusing. For a three-cylinder unit on a frame, we further recommend anti-vibration mounting, as the damping mass of the tank is missing. The exact scope of delivery will be confirmed by telephone before ordering.
- How should I anchor the unit to prevent vibration?
- Place it on a flat, rigid surface, use anti-vibration pads for mounting, and choose a flexible hose connection to the tank rather than a rigid pipe. Although the three-cylinder arrangement vibrates less than a twin-cylinder, a piston compressor without the damping mass of a tank is always more sensitive to how it is mounted.
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
Three cylinders in a W share the work, so each one grafts less. On a bare frame, you'll value that twice over.
Additional parameters
| Category: | Air compressors |
|---|---|
| Warranty: | 3 years |
| Compressor type: | Piston compressor |
| Pressure: | 10 bars |
| Suction power: | 530 l/min |
| Air delivery: | 440 l/min |
| Pressure vessel volume: | It isn't |
| Motor power: | 3.0 kW |
| Mains voltage: | 400/50 V/Hz |
| Speeds: | 1,202 rpm |
| Number of cylinders: | 3 |
| Number of grades: | 1 – single-stage compressor |
| Lubrication: | Oleic |
| Noise: | 80dB(A) |
| Dimensions: | 720 × 420 × 430 mm |
| Weight: | 54 kg |
| Engine: | Electric |
| Soundproofed: | No |
| Drive: | V-belts |
| Air dryer: | No |
| Retrieved from: | Professional |
| Development: | Stationary |
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