Pressure Booster Basics for Compressed Air
A pressure booster raises the available network pressure locally to a higher level, without lifting the whole compressor. That saves energy and protects the piping when only one station needs 12 or 16 bar. This guide explains the working principle, the intensification ratio and sizing step by step.
View pressure boostersHow does a pressure booster work?
A pressure booster uses the area ratio of two coupled pistons. The large piston face is driven by network pressure, while the small face compresses the medium on the outlet side. Pressure therefore rises in proportion to the areas, and the volume falls accordingly. A pilot valve reciprocates the piston back and forth until the set outlet pressure is reached.
Which designs are available?
The main distinction is between air-to-air boosters and air-over-oil intensifiers. The former raise air pressure for a single point of use, the latter turn low air pressure into high oil pressure for clamping and pressing. The choice depends on the outlet medium and the pressure level you need.
- Single stage for moderate boost up to about 2:1.
- Two stage when you need well above 12 bar from 6 bar.
- Air-over-oil intensifiers for high holding force at short stroke.
How do I size consumption and capacity?
A booster consumes more inlet air than it delivers at the outlet, because part of the energy is lost in the intensification. For fluctuating demand, fit a receiver tank downstream so pressure peaks are buffered and the booster does not cycle constantly. A filter and lubricator ahead of the inlet protect the seals and extend service life.
Frequently asked questions
Why not just set the compressor higher?
A higher network pressure raises energy use and leakage losses across the whole system. When only one station needs more pressure, a local booster is more economical and spares the piping and other consumers.
How much inlet air does a pressure booster need?
Consumption is well above the delivered volume, because energy is lost in the intensification. On a 2:1 booster more volume flows in than arrives at the outlet at higher pressure. A downstream receiver smooths the demand.
Can a pressure booster hold pressure continuously?
Yes. Once the set outlet pressure is reached, the piston stops and the booster holds pressure with no air consumption, until use or leakage lets it fall. It then cycles automatically to top up.
Find the right pressure booster
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Vetted selection
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Intensification matched to the outlet pressure you need.
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Downstream components checked for peak pressure.
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