Cast iron piston compressor HWK700-5-5/270P-15P input power 4 kW, intake 560 l/min, pressure 15 bar, air receiver 270 l, voltage 400/50 V/Hz
Code: HWK700-5-5/270P-15P
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Product detailed description
WALTER HWK700-5,5/270P-15P High-Pressure Cast-Iron Piston Compressor - 15 bar
The HWK700-5,5/270P-15P achieves the highest pressure in the entire WALTER range – 15 bar. The 2V cast-iron twin-cylinder with a power input of 4.0 kW (5.5 HP) has an intake of 560 l/min and delivers 470 l/min to the distribution system. Unit speed 776 rpm, 270 l horizontal tank, 400 V / 50 Hz power supply, noise level approx. 80 dB(A), 3-year warranty upon registration at waltercesko.cz.
15 bar is redundant in a standard workshop. It makes sense where equipment operates at 12 to 13 bar and requires a reserve above its operating pressure, or where testing and pressurising are conducted at values that a ten-bar or thirteen-bar machine cannot reach. The highest pressure in the range comes at the cost of performance: compared to the ten-bar version on the same motor, you lose 80 l/min.
Configuration of this machine
- Cast-iron unit — 2V · 776 rpm · single-stage compression
- Pressure vessel — 270 l · horizontal
- Horizontal design
- Three-phase 400/50 V/Hz
- High-pressure version — 15 bar — for applications requiring more than 10 bar
Why choose this model
15 bar – the highest pressure in the WALTER range
15 bar is the ceiling of the entire range and is achieved by only two machines. If you have equipment with a working pressure around 13 bar, this is the only variant in the 4.0 kW class that leaves you a reserve for the regulator drop and distribution losses.
270 l tank as an energy reservoir
Above an eight-bar air network, this tank has approximately 1,890 l of free air available, which is more than triple what the same tank provides on a ten-bar machine (540 l). Therefore, if you need to cover short but high-demand draws, you do not need to buy a larger machine – higher pressure is sufficient.
776 rpm and still a twin-cylinder
The higher the pressure, the slower the unit runs: 993 rpm at 10 bar, 817 at 13 bar, and 776 at 15 bar. The cast-iron twin-cylinder with a large bore thus operates in the lowest-speed mode offered by this platform, and the piston ring sliding distance per hour of operation is the shortest of all three 4.0 kW class versions.
Compared to the thirteen-bar version, you lose 30 l/min
The 13 bar version delivers 500 l/min; this one delivers 470. Therefore, if your equipment truly requires 15 bar, you lose only another 30 l/min compared to the thirteen-bar version – most of the drop, 50 of the 80 l/min, already happened in the step from 10 to 13 bar.
Who is it for
Suitable for facilities with testing laboratories or pressure technology: production and testing of hydraulic and pneumatic components, pressure testing of hoses and fittings, and specialised pressing and forming tools. Typically purchased by companies that know exactly what pressure their machinery requires and have distribution lines, hoses and fittings rated for over 10 bar. It is a poor choice for a workshop using impact wrenches and painting equipment.
Typical applications
- Pressure and leak tests up to 15 bar
- Testing and trial rigs for hoses, fittings and pressure components
- Equipment with an operating pressure of 12–13 bar that requires a margin above the working value
- Pneumatic presses and forming tools with a higher prescribed pressure
- Feeding long distribution lines where several bars are lost during transit to the point of consumption
- Standard tools via a pressure regulator – with a significantly larger reserve between motor starts
Where to choose a different model
Your equipment requires 13 bar and no more
Go for the HWK700-5,5/270P. You will get 30 l/min more air and won't have to worry whether the distribution line and fittings can handle 15 bar.
High pressure is not required, just more air for the workshop
The ten-bar WK650-5,5/270P on the same motor delivers 550 l/min – 80 l/min more than this machine. For impact wrenches, grinders and painting, this is clearly the better choice.
You need 15 bar, but 470 l/min is not enough
The industrial 15-bar variant is the HWK1200-10/500P-15P: four-cylinder 7.5 kW, 900 l/min and a 500 l tank.
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
HWK700-5,5/270P
The 13 bar version of the same machine: 30 l/min higher delivery (500 l/min) at 817 rpm.
WK650-5,5/270P
Ten-bar platform base: 550 l/min, 993 rpm, same 270 l tank.
HWK1200-10/500P-15P
15 bar in industrial size: 7.5 kW, 900 l/min, 500 l tank, lowest rpm in the range.
Frequently asked questions
- Do I need to change the piping and hoses for 15 bar?
- Check this before connecting the machine. Standard workshop equipment – hoses, quick couplings, valves, filters – is often supplied for a maximum of around 10 bar. Everything before the pressure regulator, i.e., between the compressor and the regulator, must be rated for the full tank pressure. After the regulator, components for the pressure you set are sufficient.
- What is the actual difference between the 13 bar and 15 bar versions?
- Intake drops from 600 to 560 l/min, delivery from 500 to 470 l/min, and speed from 817 to 776 rpm. The tank, motor, and cast-iron unit are identical. The difference in performance is therefore small; only purchase the 15 bar version if your equipment strictly requires it – otherwise, you are simply trading delivery for pressure that will not be used.
- How long does it take to pressurise the tank to 15 bar?
- The calculation gives approximately 8.6 minutes from zero to full pressure without consumption. This is the longest filling time of all 4.0 kW class models, resulting directly from the fact that more air fits into the same tank. In practice, filling takes slightly longer than calculated.
- Can I leave it running continuously at 15 bar?
- The machine is designed for 15 bar and the slow-running speed of 776 rpm facilitates long cycles, but the recommended duty cycle is always in the manual for the specific machine and is binding. In high-pressure operation, be even more diligent with maintenance – especially weekly condensate draining and a clean intake filter.
- Why does the product URL contain hwk650 when the model is called HWK700?
- Web addresses for high-pressure models were created using older nomenclature and remained unchanged so that owners of older machines could find spare parts. It is the same machine – the decisive factor is the order code HWK700-5,5/270P-15P, which you should use when ordering parts.
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
Fifteen bar on two cylinders and the lowest revs in its class. Nobody rushes on a test bench — and neither does this one.
Additional parameters
| Category: | Air compressors |
|---|---|
| Warranty: | 3 years |
| Compressor type: | Piston compressor |
| Pressure: | 13 bar |
| Suction power: | 560 l/min |
| Air delivery: | 485 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: | 776 ot/min |
| Number of cylinders: | 2 |
| Number of grades: | 1 – single-stage compressor |
| Lubrication: | Oleic |
| Noise: | 80dB(A) |
| Dimensions: | 1650 × 660 × 1150 mm |
| Weight: | 205 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 |
Demonstrace výkonu litinového pístového kompresoru GK630-40-270 💼🌪️
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