WALTER SKTG SP and SK SP screw compressors: belt drive
7-year warrantyBelt-driven compressors 5.5 and 7.5 kW
The SK SP and SKTG SP series deliver high performance in a small footprint. These are the smallest fixed-speed WALTER screw compressors: power input of 5.5 or 7.5 kW, belt drive, and low-speed screw blocks. The SK SP is a standalone unit, the SKTG SP is mounted on a 270, 300, or 500-litre air tank, and the COMBO version additionally includes a dryer and filters. Simple and fast maintenance means more time for work and less for servicing.
All 12 models of WALTER SKTG SP and SK SP
Sorted by power input. Standalone SK SP units have no air tank; in the SKTG series, the compressor is mounted on a 270, 300, or 500 l tank, and COMBO adds a dryer and filters. For fixed-speed units, the air delivery at each pressure is a single value.
| Screw compressors WALTER SKTG SP and SK SP — all 12 versions | ||||||||
|---|---|---|---|---|---|---|---|---|
| Model | Power input | Air tank | Air delivery 8 bar | Air delivery 10 bar | Air delivery 13 bar | Dimensions L × W × H | Weight | Noise level |
| SK 5,5 SP | 5.5 kW | without tank | 0.85 m³/min | 0.7 m³/min | 0.55 m³/min | 1,020 × 720 × 1,000 mm | 220 kg | 62 dB(A) |
| SKTG 5,5/270 SP | 5.5 kW | 270 l | 0.85 m³/min | 0.7 m³/min | 0.55 m³/min | 1,120 × 720 × 1,710 mm | 300 kg | 62 dB(A) |
| SKTG 5,5/300 SP | 5.5 kW | 300 l | 0.85 m³/min | 0.7 m³/min | 0.55 m³/min | 1,683 × 739 × 1,629 mm | 326 kg | 62 dB(A) |
| SKTG 5,5/300 SP COMBO | 5.5 kW | 300 l + dryer | 0.85 m³/min | 0.7 m³/min | 0.55 m³/min | 1,683 × 739 × 1,629 mm | 369 kg | 62 dB(A) |
| SKTG 5,5/500 SP | 5.5 kW | 500 l | 0.85 m³/min | 0.7 m³/min | 0.55 m³/min | 1,970 × 720 × 1,700 mm | 350 kg | 62 dB(A) |
| SKTG 5,5/500 SP COMBO | 5.5 kW | 500 l + dryer | 0.85 m³/min | 0.7 m³/min | 0.55 m³/min | 1,970 × 720 × 1,700 mm | 382 kg | 62 dB(A) |
| SK 7,5 SP | 7.5 kW | without tank | 1.15 m³/min | 1 m³/min | 0.85 m³/min | 1,020 × 720 × 1,000 mm | 240 kg | 62 dB(A) |
| SKTG 7,5/270 SP | 7.5 kW | 270 l | 1.15 m³/min | 1 m³/min | 0.85 m³/min | 1,120 × 720 × 1,710 mm | 320 kg | 62 dB(A) |
| SKTG 7,5/300 SP | 7.5 kW | 300 l | 1.15 m³/min | 1 m³/min | 0.85 m³/min | 1,683 × 739 × 1,629 mm | 326 kg | 62 dB(A) |
| SKTG 7,5/300 SP COMBO | 7.5 kW | 300 l + dryer | 1.15 m³/min | 1 m³/min | 0.85 m³/min | 1,683 × 739 × 1,629 mm | 369 kg | 62 dB(A) |
| SKTG 7,5/500 SP | 7.5 kW | 500 l | 1.15 m³/min | 1 m³/min | 0.85 m³/min | 1,970 × 720 × 1,700 mm | 370 kg | 62 dB(A) |
| SKTG 7,5/500 SP COMBO | 7.5 kW | 500 l + dryer | 1.15 m³/min | 1 m³/min | 0.85 m³/min | 1,970 × 720 × 1,700 mm | 421 kg | 62 dB(A) |
Air delivery depends only on the power input, not on the tank: the 5.5 kW models have the same air delivery standalone or with the 270, 300 and 500 l air receiver. The tank changes the dimensions and weight.
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Belt drive in practice
Belt drive is a classic and proven solution. The screw block is driven by the motor via a belt, which is tensioned by a modern system, so maintenance is quick.
Simple operation
The classic belt gearbox is easy to operate and service takes less time.
Belt tensioning system
Modern tensioning speeds up operation and belt replacement.
Low-speed screw blocks
Durable and efficient screw blocks with low rotation speed.
Standalone machine
SK 5,5 SP and SK 7,5 SP are without tank and have a footprint of 1,020 × 720 mm. You size the air tank and dryer according to your consumption.
On a 270, 300 or 500 l tank
In the SKTG line, the compressor is built onto the air receiver, so it is supplied as a single unit. The COMBO version also includes a dryer and filters.
Standalone machine, air tank, or COMBO
| Design of the SK SP and SKTG SP series | ||
|---|---|---|
| Design | What it includes | Suitable when |
| SK SP | compressor in a housing without tank | you want to size the air receiver and dryer separately |
| SKTG SP | compressor on a 270, 300 or 500 l tank | you want a complete unit with its own air tank |
| SKTG SP COMBO | compressor on a 300 or 500 l tank, dryer and filters | you need dry and clean air without stacking components |
Ventilek advises
The belt is simple, but it needs a steady draw-off.
The SK SP and SKTG SP machines have a fixed speed, so they are best suited to workshops with constant air consumption. If consumption fluctuates, compare the SFTG KSP range with an inverter. And if you need more than 7.5 kW at a fixed speed, continue with the SK KSP range from 11 kW.
Frequently Asked Questions
- How does the SK SP differ from the SK KSP?
- The SK SP has a belt drive and a power input of 5.5 or 7.5 kW. The SK KSP has a direct drive without a belt and starts at 11 kW.
- How much room does the machine take?
- A standalone SK SP has a footprint of 1,020 × 720 mm. The assembly on a 270 l tank measures 1,120 × 720 × 1,710 mm, and on a 500 l tank 1,970 × 720 × 1,700 mm.
- What is the connection and noise level?
- All models have a G ¾″ connection and a noise level of 62 dB(A).
- What pressure do the SK SP and SKTG SP models have?
- Each model is manufactured in versions for 8, 10 and 13 bar. The air delivery at 13 bar is lower than at 8 bar; exact values can be found in the table.
- 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.
All models are covered by a 7-year warranty on the entire machine. Warranty and service conditions can be found on the page Šroubové kompresory WALTER. Air delivery is stated according to ISO 1217:2009, Annex C, sound pressure level with a tolerance of ±3 dB(A).
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