INGRESSED PARTICULATE
Dust + service contamination + seal ingress
↓
HYDRAULIC FILTRATION
NANOFORCE™DIRECT ANSWER
Hydraulic filtration protects the tolerances that make the system work.
Hydraulic Protection is the ELIMFILTERS system architecture for controlling particulate contamination in hydraulic fluid before it reaches contamination-sensitive pumps, valves, actuators and control components.
The correct decision is not simply “which filter fits.” It is which filtration path matches the circuit, operating pressure, flow demand, cleanliness target and validated application evidence.
CONTAMINATION PATHWAYS
Resolve where contamination enters, circulates and becomes critical.
INTERNAL WEAR DEBRIS
Pump + valve + actuator wear products
↓
RETURN / PRESSURE CONTROL
NANOFORCE™RESERVOIR CONTAMINATION
Maintenance + breathing + fluid handling
↓
SYSTEM CLEANLINESS
NANOFORCE™ENGINEERING PRINCIPLE
Hydraulic cleanliness has to be matched to component sensitivity and duty.
The filtration target should reflect the hydraulic components being protected, the particle sizes that matter to those interfaces and the circuit conditions under which the filter must operate.
ELIMFILTERS keeps the hierarchy explicit: hydraulic circuit → cleanliness requirement → filtration technology → product family → validated part number.
WHAT THE SYSTEM PROTECTS
Protect the components that convert fluid power into controlled work.
Hydraulic Pumps
Pumps depend on controlled fluid cleanliness because abrasive contamination can accelerate wear at precision interfaces and reduce volumetric efficiency.
Control Valves
Spools, servo valves and proportional valves operate with tight clearances where particle contamination can interfere with response and repeatability.
Actuators & Cylinders
Actuators rely on clean fluid to protect seals, surfaces and internal interfaces across repeated load cycles.
Manifolds & Precision Controls
Manifolds, pilot circuits and precision controls can become contamination-sensitive points when fluid cleanliness is not maintained.
SYSTEM → TECHNOLOGY → FAMILY
Keep the hydraulic protection hierarchy explicit.
SYSTEMHydraulic Protection
→
TECHNOLOGYNANOFORCE™→
PRODUCT FAMILYHydraulic Filters→
OUTPUTValidated Part Number
VALIDATION CONTEXT
Use cleanliness and filter-performance standards in the correct context.
ISO 4406
Used to describe hydraulic-fluid cleanliness by particle-count code.
ISO 16889
Used for multi-pass evaluation of hydraulic filter performance and beta-ratio efficiency.
NFPA T2.14
Provides hydraulic filtration test context for applicable products and systems.
DIN 51524
Provides hydraulic-fluid specification context where applicable to the operating system.
FROM HYDRAULIC CONDITION TO PART
Resolve the application in a controlled sequence.
01EQUIPMENT
02HYDRAULIC CIRCUIT
03FLOW + PRESSURE CONTEXT
04CLEANLINESS / FILTRATION TARGET
05OEM + DIMENSIONAL EVIDENCE
06VALIDATED ELIMFILTERS PART
FREQUENT QUESTIONS
Hydraulic Protection
What is Hydraulic Protection?
Hydraulic Protection is the ELIMFILTERS system domain for controlling particulate contamination in hydraulic circuits before it affects pumps, valves, actuators and precision controls. Contamination enters the system through three primary pathways: ingressed particulate from dust, service work and seal ingress; internal wear debris generated by pumps, valves and actuators as they operate; and reservoir contamination introduced through maintenance, breathing and fluid handling. Each pathway is addressed by NANOFORCE™ hydraulic filtration technology, which governs hydraulic filtration, return and pressure control filtration, and overall system cleanliness. The circuit's protected assets include hydraulic pumps, which depend on controlled fluid cleanliness because abrasive contamination accelerates wear at precision interfaces and reduces volumetric efficiency; control valves, whose tight clearances make them sensitive to particle contamination; actuators and cylinders, which rely on clean fluid to protect seals and surfaces; and manifolds and precision controls, which become contamination-sensitive points when fluid cleanliness is not maintained.
Which ELIMFILTERS technology is used for hydraulic filtration?
NANOFORCE™ is the primary ELIMFILTERS technology for hydraulic filtration within the Hydraulic Protection system. It is engineered to control the three main hydraulic contamination pathways: ingressed particulate from dust and service work, internal wear debris generated at pumps, valves and actuators, and reservoir contamination introduced through maintenance and fluid handling. Hydraulic components typically operate with small internal clearances, so NANOFORCE™ filtration must remove particles fine enough to protect pump volumetric efficiency, valve spool response and actuator seal life without introducing restriction that would compromise system pressure and flow. Cleanliness targets are commonly referenced against standards such as ISO 4406 for particle-count classification and ISO 16889 for multi-pass filter efficiency and beta-ratio performance. Because NANOFORCE™ is specific to hydraulic protection rather than fuel, lubrication or cooling systems, technology identification alone does not replace validated application evidence — final filter selection still depends on the protected circuit, flow and pressure requirements, and existing OEM or filter reference.
Why is hydraulic cleanliness important?
Hydraulic components often operate with small internal clearances. Particulate contamination can accelerate wear, disturb valve response and reduce the reliability of pumps and actuators. Hydraulic pumps depend on controlled fluid cleanliness because abrasive particles accelerate wear at precision interfaces and reduce volumetric efficiency, directly affecting system output. Control valves — spools, servo valves and proportional valves — operate with especially tight clearances, where particle contamination can interfere with response time and repeatability, producing erratic or delayed circuit behavior. Actuators and cylinders rely on clean fluid to protect seals and internal surfaces across repeated load cycles; contaminated fluid accelerates seal wear and can lead to internal leakage or reduced force output. Manifolds, pilot circuits and precision controls can also become contamination-sensitive points when fluid cleanliness is not maintained, since their small orifices and clearances offer little tolerance for particulate. This is why hydraulic cleanliness is treated as a system-wide requirement rather than a filter-only specification.
What does ISO 4406 mean?
ISO 4406 is a cleanliness-code system used to describe the concentration of particles in hydraulic fluid by defined particle-size ranges. The code is typically expressed as three numbers, each corresponding to the particle count per milliliter of fluid at a specific size threshold, allowing a hydraulic system's actual fluid cleanliness to be compared directly against the cleanliness level the circuit's components require. Different hydraulic assets tolerate different contamination levels: precision servo valves and proportional valves generally require a tighter ISO 4406 target than a simpler actuator circuit, because their clearances are smaller and their sensitivity to particulate is higher. Within ELIMFILTERS Hydraulic Protection, ISO 4406 provides one of the reference points used alongside ISO 16889 filter-efficiency data, protected-asset requirements and the operating pressure context to determine whether a given filtration configuration will maintain the fluid cleanliness a specific pump, valve or actuator needs to operate reliably.
What does ISO 16889 evaluate?
ISO 16889 is a multi-pass test method used to evaluate hydraulic-filter efficiency and beta-ratio performance under controlled conditions. The test circulates fluid with a known contaminant load through the filter repeatedly, measuring particle counts upstream and downstream at defined particle sizes to calculate the filter's beta ratio — a numerical expression of how effectively the media captures particles at that size. A higher beta ratio at a given micron size indicates higher filtration efficiency for particles of that size. This data is used together with ISO 4406 fluid-cleanliness targets to confirm that a specific NANOFORCE™ filter configuration can actually achieve and maintain the cleanliness level a protected asset requires, rather than relying on media type or micron rating alone. Because beta-ratio performance varies by filter design and operating conditions, ISO 16889 results are one part of the validated evidence ELIMFILTERS uses when confirming a hydraulic filtration application, alongside flow, pressure and protected-circuit requirements.
Can a hydraulic filter be selected only by thread or dimensions?
No. Selection should also consider the protected circuit, flow requirement, pressure conditions, collapse requirement, filtration target and validated application evidence. A hydraulic filter that fits the housing thread and physical dimensions can still be the wrong filter if its collapse rating is insufficient for the system's operating pressure, or if its filtration target does not match the cleanliness level the protected pump, valve or actuator requires. Flow requirement matters because a filter sized for a lower flow rate can introduce excessive restriction, while pressure conditions determine whether the filter media and housing can withstand the circuit's actual operating and surge pressures without collapse or bypass. Because control valves, actuators and manifolds tolerate different contamination levels, the filtration target itself must be matched to the most sensitive protected asset in the circuit, not assumed from dimensional fit. For that reason, ELIMFILTERS confirms dimensional compatibility together with these operating parameters before validating a specific hydraulic filter part number.
What information is needed to identify a hydraulic filter?
Useful evidence includes equipment model, hydraulic system function, existing filter or OEM number, dimensions, connection type, pressure context and any known cleanliness or filtration requirement. Equipment model and hydraulic system function establish which pumps, valves, actuators or manifolds the filter protects, since these assets can require different cleanliness targets. An existing filter or OEM reference, when available, accelerates identification through Part Search, though the final selection still requires confirming that the candidate filter's collapse rating, filtration efficiency and connection type match the actual application. Dimensions and connection type confirm physical and hydraulic compatibility with the housing, while pressure context — including operating and surge pressure — determines whether the filter media and housing can be safely used in that circuit. Any known ISO 4406 cleanliness target or ISO 16889 filtration requirement further narrows the selection to a configuration validated for the specific hydraulic protection application, rather than one chosen on dimensional fit alone.
HAVE A HYDRAULIC APPLICATION TO RESOLVE?
Identify the hydraulic circuit before selecting the filter.
Use equipment, circuit function, flow, pressure context, existing filter or OEM reference and available cleanliness evidence to resolve the correct ELIMFILTERS hydraulic protection path.