WALTER screw compressors
7-year warrantyScrew compressors 5.5–315 kW with a 7-year warranty on the entire machine
WALTER manufactures screw compressors ranging from compact machines for workshops to two-stage units for continuous industrial operation. The range includes 82 models in seven series. They differ in drive, power regulation and design: standalone machine, compressor on an air tank, or a complete set with a dryer. The importer and guarantor is Walter Kompressortechnik Česko from Ostrava.
Seven series of WALTER screw compressors — choose according to power and design
Each series has its own page with all models, parameters and pressures. The series name indicates what the machine can do: F stands for inverter, TG for air tank, KSP for direct drive without a belt, and DSP for two compression stages.
SF DSP — 22–315 kW
Two-stage compression. Magnetic IE5 motor with inverter and on average 12% more air than a single-stage machine.
- 13 models, pressure 8, 10 or 13 bar
- Direct drive 1:1 without a belt
- Three-stage oil separation
- Standalone machine in a cabinet
SF KSP — 5.5–315 kW
Inverter based on consumption. With variable air consumption, it saves up to 35% energy compared to a machine with constant output.
- 19 models, pressure 8, 10 or 13 bar
- Direct drive, IE4 motor (optionally IE5)
- Standalone machine
- For 5.5–15 kW, tank and dryer optional
SFTG KSP — 5.5–15 kW
Inverter on the air tank. A complete assembly: compressor with inverter built onto the pressure vessel, in the COMBO version also with a dryer.
- 14 models, pressure 8, 10 or 13 bar
- Air tank 270, 300 or 500 l
- COMBO: dryer and filters in one unit
- Direct drive
SK KSP — 11–315 kW
Fixed speed, direct drive. Simple design for constant air consumption. The airend is directly coupled to the motor, without a belt.
- 17 models, pressure 8, 10 or 13 bar
- Three-stage oil separation
- Standalone machine
- Temperature-controlled motor
SKTG KSP — 11–15 kW
Direct drive on air receiver. Fixed-speed compressor mounted on the tank, in COMBO version with dryer and filters.
- 4 models, pressure 8, 10 or 13 bar
- 500 l air tank
- COMBO: dryer with dew point +3 °C
- Direct drive without a belt
SKTG SP and SK SP — 5.5–7.5 kW
Belt drive. Fixed-speed compressors with power input of 5.5 and 7.5 kW: standalone, on an air tank, or in COMBO version.
- 12 models, pressure 8, 10, or 13 bar
- Air tank 270, 300 or 500 l
- COMBO: dryer and filters 1 and 0.01 µm
- Belt drive
SLC Laser Cut — 15–22 kW
For laser cutting. Machines with an inverter for 16 and 20 bar. The SLCTG 15 COMBO model has a dryer and a set of five filters.
- 3 models, pressure 16 and 20 bar
- Standalone SLC 22 and COMBO with dryer
- Inverter
- For laser cutters
Not sure which series to choose?
Write to us how much air and what pressure you need and how long the machine should run. We will recommend the range and size.
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Four designs — choose according to what you need
Which range to choose
| Range selection according to operation | |
|---|---|
| Situation | Range |
| Air consumption is constant during the shift | SK KSP, SKTG KSP or SKTG SP — fixed speed and simple design |
| Consumption fluctuates during the day | SF KSP or SFTG KSP — the inverter adapts output to demand and saves up to 35% of energy with variable consumption |
| The machine runs almost continuously and electricity costs are decisive | SF DSP — two-stage compression and IE5 magnetic motor |
| You want a single unit without assembling components | SFTG KSP, SKTG KSP or SKTG SP — compressor on an air tank, also available in COMBO version with a dryer |
| You cut with a laser and need 16 or 20 bar | SLC Laser Cut |
Ventilek advises
First find out how air consumption varies in your case.
If the machine draws a constant load, fixed speed is enough. If consumption fluctuates during a shift, an inverter that continuously adapts the output pays off. And if the compressor must not stop even at night, take a look at the two-stage SF DSP range.
Ranges side by side
| WALTER screw compressors — seven ranges, 82 models | ||||
|---|---|---|---|---|
| Range | Power input | Drive and control | Design | Models |
| SF DSP | 22–315 kW | direct drive, inverter, two compression stages | stand-alone machine | 13 |
| SF KSP | 5.5–315 kW | direct drive, inverter | standalone unit, for 5.5–15 kW optionally with tank and dryer | 19 |
| SFTG KSP | 5.5–15 kW | direct drive, inverter | on a 270, 300 or 500 l air tank, COMBO with dryer | 14 |
| SK KSP | 11–315 kW | direct drive, fixed speed | stand-alone machine | 17 |
| SKTG KSP | 11–15 kW | direct drive, fixed speed | on a 500 l air tank, COMBO with dryer | 4 |
| SKTG SP and SK SP | 5.5–7.5 kW | belt drive, fixed speed | standalone machine, on a 270, 300 or 500 l air tank, COMBO with dryer | 12 |
| SLC Laser Cut | 15–22 kW | inverter, pressure 16 and 20 bar | standalone machine and COMBO with dryer | 3 |
Pressure for most models is 8, 10 or 13 bar, for the SLC series 16 and 20 bar. For machines with an inverter, the air delivery is given as a range from the lowest to the highest speed; the air delivery of individual models can be found on the series pages.
How to read the model designation
The model designation is an abbreviation that tells you what the machine includes. For example, SFTG 7,5/500 KSP COMBO is a compressor with an inverter (F), built onto an air tank (TG), with a power input of 7.5 kW and a 500 l tank, with direct drive (KSP) and a dryer (COMBO).
| Designation of WALTER screw compressors | |
|---|---|
| Designation | Meaning |
| F | inverter continuously adapts output to demand (SK series have fixed speed) |
| TG | compressor mounted on an air tank |
| KSP | direct drive without a belt |
| SP | belt drive |
| DSP | two-stage compression |
| COMBO | compressor, air tank and dryer in one unit |
| number before the slash | motor input power in kW |
| number after the slash | air tank volume in litres (for the SLC range, operating pressure in bar) |
What's inside
The heart of every machine is the screw block: two rotors with a helical profile, rotating against each other in a housing with oil injection. Air captured between the teeth is compressed continuously in a shrinking space, without pulsation. This is why a screw compressor runs more smoothly and with less vibration than a piston compressor, and is designed for continuous operation.
The KSP and DSP ranges have a direct 1:1 drive: the block is connected to the motor without a belt, so no power is lost in the transmission.
- Three-stage oil separation — for the SK KSP and SF DSP ranges, no more than 3 ppm of oil mist remains in the output air.
- Cooling — efficient axial fan and temperature-controlled motor.
- IE4 and IE5 motors — the SF KSP range has an IE4 motor (IE5 optional), the SF DSP range has an IE5 magnetic motor.
- WALTER CONTROLLER control unit — monitors the cooling and operating conditions of the machine.
View inside the cabinet
7-year warranty and service
Seven years on the entire machine
WALTER screw compressors come with a seven-year warranty without exceptions. Warranty and post-warranty service is provided by the importer directly in the Czech Republic.
- The warranty is valid from the date of purchase and covers the entire compressor, including all components.
- It applies to machines purchased from 1 January 2025.
- The condition is regular maintenance according to the operating manual — for WALTER screw compressors, every 2,000 operating hours.
- Report a defect by e-mail or using the importer's claim form; the claim will be processed within 14 working days.
- The warranty transfers to the next owner if you sell the compressor during the warranty period.
- Service and spare parts are provided by Walter Kompressortechnik Česko in Ostrava.
Frequently Asked Questions
- Does a screw compressor pay off compared to a piston compressor?
- A screw compressor is designed for continuous operation, a piston compressor for intermittent operation. It pays off where it runs several hours a day: electricity accounts for over 80% of the cost of producing compressed air over the life of the machine, and this is exactly where a screw compressor saves.
- When does an inverter pay off?
- When air consumption fluctuates during a shift. The inverter adjusts the speed to the current demand and, with variable consumption, saves up to 35% of energy compared to a machine with constant output. Conversely, with steady demand, fixed speed is the better choice.
- How often is service needed?
- For all WALTER screw compressors, every 2,000 motor hours. Regular maintenance is also a condition for the seven-year warranty.
- Can an air receiver and dryer be added to a standalone machine?
- Models SF 5.5–15 KSP can optionally be equipped with an air receiver and a dryer. Ready-made assemblies are the SFTG KSP series (on an air tank) and COMBO (including a dryer).
- What pressure to choose?
- Most models are available in 8, 10, and 13 bar variants. Choose according to the highest pressure your tools require, and add a reserve for losses in the distribution system. The SLC series operates at 16 and 20 bar.
Air delivery is stated according to ISO 1217:2009, Annex C. The sound pressure level is valid with a tolerance of ±3 dB(A) according to ISO 2151:2004 and ISO 9614-2.
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WALTER SF DSP screw compressors
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WALTER SF KSP screw compressors
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WALTER SK KSP screw compressors
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WALTER SFTG KSP screw compressors
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WALTER SKTG KSP screw compressors
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WALTER SKTG SP and SK SP screw compressors
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WALTER SLC Laser Cut screw compressors
Bestsellers
Product sorting
List of products
A machine for smaller operations with fluctuating consumption, oil is separated in it by an immersion separator. The housing with a footprint of 1,090 × 730 mm weighs 243 kg,...
A machine for smaller production with fluctuating demand, which can optionally be fitted with a tank and dryer. It weighs 243 kg, the connection is G ¾″ and the noise level is...
A machine with an inverter for medium-sized operations where air consumption varies. It weighs 378 kg, noise level is 64 dB(A). The G 1″ connection and cabinet with a floor plan...
A large standalone machine with an inverter for production with variable air consumption. It weighs 4,000 kg, the connection is DN 65 and the noise level is 77 dB(A). The air...
The smallest two-stage WALTER for operation that runs full shifts and doesn't want to waste electricity. The housing with a footprint of 1.5 × 1.04 m weighs 738 kg and the...
Single-stage machine with an inverter for operation that will not run full shifts. It is 320 kg lighter than the two-stage SF 22 DSP. The connection is G 1″, noise level 64 dB(A).
Basic model from a range of three machines in a common housing for medium-sized operations with fluctuating consumption. It weighs 518 kg, the connection is G 1½″ and the noise...
The smallest two-stage WALTER, capable of handling up to 13 bar. It shares a housing with the SF 30 DSP and weighs 841 kg. Connection G 1½″, noise level 65 dB(A).
Middle machine out of three in a common enclosure, suitable for medium-duty operation with fluctuating consumption. It weighs 591 kg, the connection is G 1½″, noise level is 66...
The strongest machine of the three in a common housing, designed for medium operation with fluctuating demand. It weighs 690 kg, the connection is G 1½″, noise level 66 dB(A).
The more powerful of the pair of two-stage machines in a shared housing with the SF 45 DSP, for operation with several larger consumers at the same time. It weighs 1,663 kg,...
A two-stage WALTER with its own housing, designed for larger operations with continuous running. It weighs 1,861 kg and the connection is G 2″. Noise level 68 dB(A).
Two-stage WALTER for industrial operation with continuous draw-off, the first model in a large housing with a DN 65 connection. It weighs 3,300 kg. Noise level 70 dB(A).
The most powerful assembly in the SFTG KSP range for operation with higher air consumption. Housing 1,970 × 760 × 1,750 mm, weight 432 kg, connection G ¾″, noise level 62 dB(A).
A medium tank size in the SFTG KSP range, an inverter compressor for a workshop with fluctuating air consumption. The 1,683 × 739 × 1,629 mm assembly weighs 326 kg, the...
Complete set for smaller operations with intermittent demand and dried air: compressor, tank, dryer and filters all in one unit. Housing 1,970 × 720 × 1,700 mm, weight 395 kg,...
A compressor with an inverter for smaller operations that require higher pressure and have limited space. The housing 1,280 × 650 × 1,630 mm weighs 280 kg, the connection is G...
An assembly with a large air supply for operation with multiple outlet points and tools requiring higher pressure. Housing 1,970 × 720 × 1,700 mm, weight 383 kg, connection G...
Complete assembly for operation with multiple extraction points, where dried air and reserve capacity in the air tank are required. Dimensions 1,970 × 720 × 1,700 mm, G ¾″...
Direct-drive model for operation that has outgrown the smallest housing in the range but does not yet require the medium size. The 1,300 × 880 mm housing is shared with the SK...
Mid-size housing model for three sizes, designed for constant air consumption without speed control. G 1½″ connection, weight 591 kg and noise level 66 dB(A).
The most powerful model with a housing of 1,500 × 1,030 mm for operation with continuous air consumption. It weighs 690 kg, G 1½″ connection, noise level 66 dB(A).
A standalone machine for a workshop for which a weaker model is not sufficient and which wants to choose its own air tank. It weighs 240 kg, the housing is 1,000 mm high, the...
The more powerful of the pair of machines in a shared housing of 2,158 × 1,331 mm, for operation with higher constant consumption. Weight 1,225 kg, connection G 2″, noise level...
The lightest model in the large housing of 2,727 × 1,666 mm with the first DN 65 connection in the series, for industrial operation with constant demand. It weighs 1,795 kg,...
Fixed-speed compressor for operation with constant air demand. Large low-speed airend, steel piping and a control unit for controlling up to 8 machines. Housing 1,970 × 760 ×...
Fixed-speed compressor with the highest power input in the SKTG KSP range, for operation with higher continuous air consumption. Housing 1,970 × 725 × 1,750 mm, weight 429 kg,...
A medium-sized tank for a workshop that cannot make do with the smallest air tank, but does not want to waste space on the largest one. The unit weighs 326 kg, the housing is...
A complete setup for a workshop that wants dried and filtered air directly from the machine and doesn't want to assemble individual components. It weighs 382 kg, the connection...
The stronger of the two assemblies on the smallest tank, designed for a workshop with higher consumption and limited space. The compressor is mounted directly on the tank, the...
A more compact assembly mounted on the air receiver for operation with higher consumption, where there is no space for the longest housing in the range. The housing is 1,683 mm...
Complete set for operation with higher consumption, where dried and filtered air is required directly from the machine. It weighs 421 kg, the connection is G ¾″ and the noise...
The mid-sized model of the large two-stage housing, for operations that need reserve capacity and do not want to change the footprint. It weighs 3,600 kg, has a DN 80...
The middle machine of three in a large common enclosure, for industrial operation with variable demand. It weighs 2,124 kg, the noise level is 70 dB(A) and the connection is DN 65.
The most powerful model of the large two-stage casing for continuous industrial operation. It weighs 3,900 kg and the connection is DN 80. Noise level 74 dB(A).
The most powerful machine in a large common housing for industrial operation with fluctuating consumption. Connection DN 65, weight 2,281 kg, noise level 72 dB(A).
Two-stage WALTER in its own enclosure for large-scale production with continuous operation. It weighs 4,250 kg, connection DN 100. Noise level 76 dB(A).
A large machine with an inverter in its own cabinet, designed for production with variable demand. The cabinet with a footprint of 2,696 × 1,696 mm is not shared with any other...
Two-stage WALTER for large industrial operation with continuous consumption. It weighs 4,650 kg and has the same DN 100 connection as the SF 160 DSP. Noise level 76 dB(A).
A large industrial machine with an inverter and a DN 80 connection for variable air consumption. It weighs 4,400 kg, the noise level is 77 dB(A), and the 3,410 × 2,170 mm...