Compressor filters
Intake air, lubricating oil, air-oil separation and downstream compressed-air treatment, selected as one system for screw, reciprocating and centrifugal machines.
Five protection points in a compressor station
Each element depends on the adjacent stages. A blocked intake increases energy use, a damaged separator raises oil carryover, and an incorrect line filter cannot deliver the purity required by the user.
- 01Intake
Dust stopped before the air end.
- 02Oil
Cleanliness of the circulating oil.
- 03Air-oil separator
Oil return and low carryover.
- 04Dryer
Removal of moisture and condensate.
- 05Point of use
Final purity of the process.
Elements for the compressor and air main
Panel, cylindrical and conical elements protecting the air end from dust; checked for airflow, area, interface and initial/terminal ΔP.
Look inside →02Lube oilLube-oil filtersProtect bearings and the screw air end from wear debris; valve setting, thread, rating, oil viscosity and cold-start conditions must match.
Look inside →03Air / oilAir-oil separatorsDepth and coalescing layers return oil to the circuit; internal/external design, flange, gasket, earthing and allowable ΔP must match.
Look inside →04Line filterParticulate and coalescingRemove particles, liquid water and oil aerosol downstream of the compressor; housing and element are sized by flow, pressure and operating ΔP.
Look inside →Reduce oil vapour and odour after an effective coalescing stage; they do not replace liquid-aerosol removal and require scheduled replacement.
Vacuum-pump filters, breathers, condensate and process-fluid treatment, selected from the medium composition and machine arrangement.
Purity is specified for three contaminant groups
Particle, water and total-oil classes are specified separately. One filter name cannot guarantee a class: the outcome depends on the compressor, cooler, separator, dryer, drains, pipework and sampling point.
Filtration chain by duty
- Typical chain
- Separator → prefilter → dryer → dust afterfilter
- Key control
- Dew point, ΔP and drain operation
What to send the engineer
- 01Compressor
Make, model, serial number, OEM references and nameplate photo.
- 02Duty
Flow, pressure, temperature, running hours, lubricant and site conditions.
- 03Element
Dimensions, thread/flange, gasket, valves, flow direction and photo.
- 04Requirement
Required air class, allowable ΔP, dew point, oil level and critical point of use.
Frequently asked questions
Why did pressure drop rise after replacement?
Check flow direction, actual area, rating, gasket, flow and the adjacent stages. Matching external dimensions alone does not prove hydraulic equivalence.
Why is the compressor carrying oil over?
Possible causes include a damaged or overloaded separator, incorrect oil level, blocked scavenge line, wrong lubricant, short cycling or excess flow. Diagnose the system rather than replacing one element blindly.
Can an element be selected by dimensions without an OEM code?
Yes, with full interface dimensions, photos, flow direction and operating data. Oil filters also require valve and thread checks; separators require gasket, flange and earthing checks.
How often should line filters be changed?
At terminal ΔP, the maker interval, failed air-quality verification or damage — whichever occurs first. The interval depends on actual loading and drain performance.
Do you supply filters for different compressor brands?
We select original or technically equivalent elements from verified data. We supply and service equipment from leading European manufacturers without claiming unconfirmed official partnerships.
The filtration chain in 3D
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