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SYSTEM DIAGRAMCURRENT · v1.0.0DIAG-HYD-CONTAMINATION

Hydraulic System Contamination Ingression Paths

Maps the three fundamental contamination sources that govern hydraulic fluid cleanliness. Built-in contamination enters at assembly and cannot be eliminated without pre-commissioning flush. Ingressed contamination enters continuously during operation through dynamic seals and reservoir breathers. Generated contamination is produced by component wear — itself accelerated by particle contamination, creating a positive-feedback loop that system filtration must break.

Hydraulic System Contamination Ingression PathsThree contamination ingression paths in a hydraulic system: built-in contamination from manufacturing and assembly residues, ingressed contamination through seals, breathers, and cylinder rods, and generated contamination from component wear (adhesive, abrasive, fatigue). All converge on the hydraulic reservoir. Filtration removes particles from the circuit. Based on ISO 16889 and NFPA T2.14.HYDRAULIC RESERVOIRRETURN FILTERPRESSURE FILTERPreturn ←→ supplyBUILT-INCONTAMINATIONManufacturing residuesAssembly contaminationCasting sand / metal finesResidual hose fibresINGRESSEDCONTAMINATIONBreather / vent contaminationCylinder rod sealsFluid top-up (unfiltered)Access covers / serviceWater / coolant ingressGENERATEDCONTAMINATIONPump / motor wear debrisValve spool / bore erosionSeal degradation particlesHose interior erosionOxidation / varnish particlesTARGET CLEANLINESSServo valves: ISO 14/12/10Prop. valves: ISO 17/15/12Gear pumps: ISO 19/17/14per ISO 4406 / NFPA T2.14ISO 16889 · NFPA T2.14 · ISO 4406
Central hydraulic reservoir with three contamination sources shown as labelled boxes with arrows pointing to the reservoir. Top left: Built-in contamination (manufacturing residues, assembly contamination, casting sand, hose fibres). Top right: Ingressed contamination (breather, cylinder rod seals, unfiltered top-up, access covers, water ingress). Bottom left: Generated contamination (pump wear debris, valve spool erosion, seal degradation, hose erosion). Return filter and pressure filter shown removing particles from the circuit loop. Target cleanliness table for servo valves, proportional valves, and gear pumps shown bottom right.

GOVERNING STANDARDS

ISO 16889
NFPA T2 14
ISO 4406

ELIMFILTERS TECHNOLOGIES

NANOFORCE™

APPLICABLE SYSTEMS

Hydraulic Protection

REVISION METADATA

Versionv1.0.0
Statuscurrent
Last Reviewed2026-07-08
Next Review2027-07-08

RELATED ENGINEERING ARTICLES

→Contamination Control
→Hydraulic Power Unit Design
→Hydraulic System Flushing
→Hydraulic Reservoir Design
→Particle Ingress Prevention

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