Cast iron WK900 aggregate on base frame power input 5.5 kW, suction capacity 880 l/min, pressure 10 bar, without air receiver, voltage 400/50 V/Hz
Code: WK900-PLATE
Related products
Product detailed description
WALTER WK900P-PLATE Cast Iron Compressor Unit - Base Frame
The WK900P-PLATE is a standalone three-cylinder cast iron unit on a base frame, supplied without a pressure vessel. The 3W version with a 5.5 kW (7.5 HP) power input has an intake of 880 l/min, delivers 740 l/min to the distribution system at 10 bar, and operates at 902 rpm. 400 V / 50 Hz power supply, V-belt drive, noise level approx. 80 dB(A), 3-year warranty after registration at waltercesko.cz.
At this size, a unit without a tank is typically purchased for a specific purpose: either to build a central air source for an entire workshop with a large tank located separately, or to add a second source to an existing distribution system to cover peak demands. You are responsible for the tank, fittings, fusing, and inspections – the exact scope of the unit's delivery will be confirmed by phone prior to ordering.
Configuration of this machine
Why choose this model
Do not view a delivery rate of 740 l/min as a "tool-only machine", but as a distribution source. It can support two permanent workstations plus short-term peaks, or a continuously running grinder alongside additional consumption. This is precisely why a central distribution system, rather than a mobile compressor, is utilised in this class.
The W three-cylinder arrangement at 902 rpm is a favorable combination in terms of smooth operation. In a unit without a tank, which lacks the damping mass of the vessel, a more uniform torque curve is evident in the bearings and distribution joints – a characteristic that is practically imperceptible in a complete machine mounted on a tank.
Adding this unit to the distribution as a second source is often more sensible than replacing the existing machine with the largest possible model. Both machines cover peak demands, while only one handles normal operation; if one fails, the workshop does not stop. However, the design of the pressure assembly with non-return valves and the setting of switching pressures should be left to the distribution designer.
A complete machine in this class is a bulky piece of equipment, even with the tank. By opting for the unit alone, you can place it in a compressor room and position the tank where it does not obstruct – against an external wall, in a corner of the hall, or outside the working zone. Sufficient space must remain around the unit for cooling and service access.
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 Specifications WK900P-PLATE
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 aimed at metalworking, larger auto services, and workshops with multiple workstations where a central distribution system is being built or expanded. Typically, it is acquired by an operation that already possesses a pressure vessel – following an older machine or purchased separately with inspection – and requires a more powerful source for it. It is assumed that the pressure assembly and electrical installation will be designed and implemented by a professional; a 5.5 kW power input is not a connection based on estimation.
Typical applications
- Central air source for a workshop with multiple workstations
- Secondary source for existing piping to cover peak demand
- Replacement of the pump unit on a large compressor with a functional tank and valid inspection
- Compressor room with the tank located outside the working area
- Pneumatic clamping and tools in mechanical engineering production
- Continuous operation of a grinder or cutter plus additional simultaneous demand
Where to choose a different model
The WK900-7.5/270P features the same three-cylinder pump unit on a 270 l horizontal tank and is ready for operation. For a larger reserve, a variant with a 500 l tank is available.
View recommended model →Go straight for the WK1500P-PLATE: a four-cylinder 7.5 kW unit with 1,100 l/min at 768 rpm. Having a reserve in the source is more cost-effective than adding a second machine later.
View recommended model →One class lower is the WK650P-PLATE: 4.0 kW and 550 l/min at 993 rpm – same philosophy, smaller installation.
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
Complete machine with the same three-cylinder unit and a 270 l tank – ready for operation.
View model →The same pump unit on a 500 l tank – the largest reserve in this power class.
View model →One class higher: four-cylinder 7.5 kW with 1,100 l/min at 768 rpm – the most powerful unit in the range.
View model →One class lower: 4.0 kW and 550 l/min – lower requirements for the tank and electrical installation.
View model →Frequently asked questions
Is a 270 l air receiver included in the delivery?
Which pressure vessel should I choose for it?
Can I connect it alongside an existing compressor?
What are the space and cooling requirements?
Why does it have a three-cylinder design when the more powerful WK1500 has four cylinders?
Additional parameters
| Category: | Compressors for all applications - hobby and industrial |
|---|---|
| Warranty: | 3 years |
| Compressor type: | Piston compressor |
| Pressure: | 10 bars |
| Suction power: | 880 l/min |
| Displacement: | 740 l/min |
| Pressure vessel volume: | It isn't |
| 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: | 870 x 480 x 500 mm |
| Weight: | 85 kg |
| Engine: | Electric |
| Soundproofed: | No |
| Drive: | V-belts |
| Air dryer: | No |
| Retrieved from: | Professional |
| Development: | Stationary |
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