Cast iron WK650 aggregate on base frame input power 4 kW, intake 630 l/min, pressure 10 bar, no air receiver, voltage 400/50 V/Hz

Product detailed description

WALTER WK650P-PLATE cast-iron compressor unit on a base frame

WK650P-PLATE is a standalone cast-iron unit of the 4.0 kW platform on a base frame, without a pressure vessel. The 2V twin-cylinder unit with a power input of 4.0 kW (5.5 HP) has an intake of 630 l/min, delivers 550 l/min to the distribution line at 10 bar, and operates at 993 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 serves as the mechanical base of the most frequently requested machine in the range – simply without the tank, wheels, and distribution system. It is purchased by those building a separate compressor room to keep the noise behind closed doors, or by those whose unit on a 270 l tank compressor has reached the end of its service life while the tank still has a valid inspection. You are responsible for the connections, pressure switch, and fusing; the scope of delivery will be confirmed by phone prior to ordering.

Configuration of this machine

• Cast-iron unit — 2V · 993 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

Who is it for

A typical buyer is a car repair shop, metal fabrication shop, or paint shop building a separate compressor room, or an operation with a good 270 l tank and a worn-out unit. A delivery rate of 550 l/min can sustain one continuous workstation – a spray gun, for example – plus the peaks of a second user, meaning a system built on this unit is not a supplementary source, but the workshop's primary air source. It is assumed that the pressure assembly and electrical installation will be handled by a professional.

Typical applications

• Separate compressor room with the tank located in the hall or outdoors
• Replacement of a worn-out unit on a compressor with a 270 l tank
• Main air source for one continuous and one occasional workstation in a car repair shop or metal fabrication shop
• Powering an HVLP spray gun in a paint shop from a custom pressure assembly
• A secondary source in parallel with an existing compressor to cover peak demands
• Integration into a process installation with its own pressure vessel

Where to choose a different model

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

Frequently asked questions

Can I enclose it in a soundproof cabinet?

You can, but the cabinet must have properly designed airflow – cold air intake and hot air exhaust, ideally with a fan. The cast-iron unit is cooled by a large ribbed surface and a flow from its own fan; in a sealed box, it would overheat, the oil would darken, and there would be a risk of damage. At the same time, maintain access for checking the oil level and the filter.

What size tank do I need for it?

A 270 l tank is suitable for a 630 l/min intake, which is the same as that used in the complete machine on this platform. With a difference between the switch-on and switch-off pressure of 2 bar, a 270 l tank delivers approximately 540 l of free air per cycle, which means roughly 14 motor starts per hour at a constant demand of 200 l/min. With a smaller tank, the number of starts would be significantly higher.

What else do I need to arrange for the unit?

A pressure vessel with a valid inspection and corresponding maximum pressure, a pressure switch, a safety and non-return valve, a pressure regulator, and outlet fittings. For the electrical installation, assume a 400 V supply fused according to the 4.0 kW power input and cable length – refer to the machine manual for specific values. The scope of delivery for the unit will be confirmed by telephone.

Can I install it in parallel with an existing compressor?

Yes, using two sources on a single distribution network is a common solution to cover peak demand without purchasing a larger machine. However, you will need a correctly designed pressure assembly with non-return valves and reasonably set switching pressures for both machines to prevent interference. Leave the design to someone who specialises in pressure distribution systems.

Does the service schedule for the three-year warranty also apply to the unit?

Yes. After the first 8 hours, tighten the cylinder head bolts to a torque of 25 Nm; further requirements include daily oil and connection checks, monthly filter cleaning, the first oil change after 100 hours and then at least once every 6 months, plus inspections in the 6th, 12th, 18th, 24th, and 30th month. Condensate draining in a custom assembly pertains to your vessel and should be handled at least once a week.

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.