STAUFF Inline Safety Filter

Buy SFIS Inline Safety Filters for high-pressure hydraulic systems

The SFIS series of inline safety filters from STAUFF are precision-engineered protective filters for mobile and industrial hydraulic systems. They prevent particulate contamination – caused, for example, by frequent coupling of hydraulic lines, maintenance work or external ingress – from reaching sensitive control, regulating and throttle valves.
As the final stage of protection immediately upstream of critical components, they enhance operational reliability, extend the system’s service life and reduce unplanned downtime. SFIS filters complement return, pressure and bypass filters and form an integral part of a comprehensive filtration concept.

Materials and design

The filter housings are made of robust carbon steel and feature a highly durable zinc/nickel coating. This surface finish offers excellent corrosion protection and is ideal for demanding applications.
The sealing elements are manufactured from NBR (Perbunan®) as standard; other materials are available on request. The design is rated for operating pressures of up to 250 bar and offers additional stability thanks to the typical threefold safety factor.

Product variants, sizes and compatibility

The SFIS series comprises several sizes and versions for different connection configurations. Depending on the model, replaceable or non-replaceable filter inserts are available.
The star-shaped pleated filter elements increase the filter surface area and ensure lower pressure drops as well as a high dirt-holding capacity. In addition, variants with an integrated bypass valve are available for applications where the flow rate must be maintained even as the differential pressure rises.
The series can be flexibly integrated into existing systems – typically between couplings, hoses, manifolds or directly upstream of sensitive hydraulic valves.

Principle of operation

The flow always passes through the filter element from the outside in. The filter media consist of stainless steel wire mesh (1.4305) and are available in filtration grades of 60 µm and 100 µm.
As the fluid flows through, contaminants are reliably trapped on the filter surface before they can cause damage to the hydraulic system. As a result, the SFIS series acts as a targeted protective measure precisely where contaminants would be particularly critical.

Key product features

The SFIS series offers a combination of compact design, low weight and high robustness. Its construction allows for easy integration into confined installation spaces and is suitable for mobile machinery as well as stationary hydraulic power units.
The high contaminant-holding capacity of the filter elements extends maintenance intervals, whilst optionally available bypass variants ensure reliable operation even under demanding conditions.

Areas of application

SFIS inline safety filters are used in a wide range of mobile and stationary hydraulic systems. Typical applications include:

mobile attachments and tools

construction and agricultural machinery

Hydraulic maintenance equipment

industrial plants and units

Systems involving frequent coupling or changing attachments

Wherever contaminants can cause immediate malfunctions, SFIS filters provide an effective protective barrier.

Advantages of the SFIS series

The SFIS series combines high operational reliability with economic efficiency. The large filter element surface area, robust construction and flexible installation make it a tried-and-tested solution for demanding hydraulic applications.
Key benefits include:

reliable protection of sensitive control and regulating valves

long service life thanks to high dirt-holding capacity

low differential pressure due to star-shaped pleated elements

robust design for operating pressures up to 250 bar

easy retrofitting and integration into existing systems

Data sheet for STAUFF Inline Safety Filters

PDF

Datenblatt SFIS Safety Inline Filter EN

0,19 mb

Frequently asked questions and answers about STAUFF SFIS filters

What is an SFIS series inline safety filter?

An SFIS series inline safety filter is a hydraulic protection filter that traps particulate contaminants before they reach sensitive components in the hydraulic system.

What are SFIS Inline Safety Filters used for?

They are used in mobile and stationary hydraulic systems to protect valves and control components from dirt particles generated, for example, during coupling or maintenance.

What filtration grades are available?

The standard filtration grades are 60 µm and 100 µm. Other grades may be available depending on the specific application.

How does the flow path work in SFIS filters?

The flow passes from the outside to the inside through the filter element, ensuring that particles are reliably trapped on the surface.

What filter medium is used?

The elements consist of stainless steel wire mesh, which is suitable for heavy-duty use and continuous operation.

Are there versions with a bypass valve?

Yes. Some models feature an integrated bypass valve, which allows for controlled bypass flow in the event of increased differential pressure.

Are the filter elements replaceable?

Depending on the model, either replaceable or permanently fitted elements are available.

What operating pressure are SFIS filters suitable for?

The series is designed for operating pressures of up to 250 bar.

Which hydraulic fluids are SFIS filters compatible with?

They are suitable for mineral oil-based hydraulic and lubricating oils, as well as numerous biodegradable hydraulic fluids.

Where are SFIS filters typically fitted within the system?

They are installed in the pipeline immediately upstream of sensitive valves, couplings or system components.

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