Order standard pneumatics Legris LF 3000 series

Comprehensive Range of Pneumatic Push-in Fittings from the Legris LF 3000 Series

Pneumatic push-in fittings from the Legris LF 3000 series are among the most widely used connection elements for compressed air systems in industrial manufacturing. They are characterized by precise workmanship, high material quality, and exceptionally easy handling. LF 3000 fittings enable quick and reliable connection of hoses and tubes – without screws, clamps, or additional tools. Simply insert the calibrated tube, and the connection is made. This tool-free assembly process not only saves time but also minimizes the risk of assembly errors.

Operating Principle: Simply Insert and Connect

The basic principle of the LF 3000 series is based on a spring-loaded stainless steel gripping ring that immediately securely fixes the inserted tube. Simultaneously, a precisely fitted O-ring seals the connection. This technology ensures that no air escapes and the system operates absolutely reliably even under high operating pressure. To release, simply pull back the release ring – the tube can be removed immediately without being damaged. This feature makes the fittings particularly attractive for systems where lines frequently need to be changed, extended, or cleaned.

Material Properties: Resistant and Durable

The LF 3000 fittings consist of a robust polymer housing that is both lightweight and resistant. Polymer offers the advantage of being corrosion-free and requiring no coating to ensure its longevity. It is insensitive to moisture, many chemicals, and common lubricants. Even in environments with high humidity or splashing water, function and appearance are maintained.

The gripping rings are made of high-quality stainless steel. Stainless steel combines high strength with corrosion resistance and ensures a consistently secure gripping action over many years. The seals are made of special elastomers that retain their flexibility and sealing effect even with temperature changes from -20°C to +80°C. They are resistant to oil mist, dust, and common cleaning agents in industrial applications.

Technical Data at a Glance

• Operating pressure: up to 20 bar
• Vacuum resistant: up to 28" Hg
• Temperature range: -20°C to +80°C
• Suitable for tubes made of PA, PU, PE, PTFE (calibrated)
• Gripping ring material: Stainless steel
• Seals: High-quality elastomers

Advantages in Industrial Use

The greatest advantage of the LF 3000 series lies in its extremely simple and quick assembly. Insert – done. No screwing, no squeezing, no additional components. This saves valuable minutes in production and maintenance, which add up to significant time savings. Furthermore, the risk of assembly errors decreases, as the connection is immediately correctly seated.

Another advantage is reusability. The fittings can be released and reconnected as often as desired without losing performance or damaging the tube. This is particularly beneficial for temporary installations or experimental setups.

Designs and Their Applications

The LF 3000 series is available in numerous designs to enable almost any installation situation:

• Straight fittings: Standard solution for simple, linear tube connections. Ideal when two lines need to be connected in a direct line.
• Elbow fittings (90°): Perfect for tight installation situations or when a pipeline needs to be routed around a corner. Helps to avoid kinks in the hose.
• T-fittings: Used to branch off an air line to another consumer or an additional machine component.
• Y-fittings: Enable an even distribution of the airflow in two directions, often used in systems with symmetrical consumers.
• Reducing fittings: For connecting tubes of different diameters. Indispensable when system components with different tube dimensions need to be connected.
• Bulkhead fittings: For mounting through panels or housing walls to ensure a secure and stable pass-through.
• Swivel fittings: Allow movement and rotation of the connected hose without it tangling or kinking – particularly important in robotics applications.

The choice of design depends on the system geometry, available space, and the requirements for the flexibility of the lines. By cleverly selecting the connectors, not only the functionality but also the maintainability of a system can be significantly improved.

Areas of Application

The application areas of LF 3000 fittings are diverse:

• Automation technology: Connection of pneumatic cylinders, valves, and control blocks.
• Production lines: Quick conversion and expansion of air supply during product changes.
• Packaging machines: Flexible air lines for grippers, conveyor systems, and control elements.
• Food industry: Media guidance with hygienically safe materials.
• Medical technology: Secure compressed air distribution for devices with high purity requirements.

Assembly Instructions for Optimal Results

To ensure maximum service life and tightness, tubes should be cut at a right angle and burr-free with a suitable tube cutter. After cutting, it is advisable to clean the tube end of dust or chips. The tube should be inserted until it reaches a noticeable stop, which ensures that the O-ring seals correctly.

For disassembly, the release ring of the fitting must be fully depressed before the tube is pulled out. This prevents the gripping ring from damaging the tube.

Material and Media Resistance

The polymer housing resists a variety of industrial media, including compressed air with oil content, neutral gases, and many aqueous solutions. Stainless steel gripping rings are resistant to corrosion from moisture and mild chemicals. For particularly aggressive media, such as certain solvents or highly concentrated acids, special variants with modified sealing materials are available.

Economy and Sustainability

The reusability of LF 3000 fittings reduces the need for spare parts and decreases material consumption. Their high tightness minimizes compressed air loss, which lowers operating costs and simultaneously saves energy. The durable materials ensure that less waste is generated and new parts need to be produced less frequently – a plus for the environment.

Quality and Standards Compliance

All LF 3000 series fittings are manufactured according to strict quality standards. They comply with international norms for pneumatic connections and undergo extensive testing, including leak, pressure, and load tests. This ensures consistently high product quality.

FAQs about LF 3000 Series Pneumatic Push-in Fittings

1. Which tube materials are compatible?

PA, PU, PE, and PTFE – in calibrated versions. The ends must be cut clean, at a right angle, and burr-free.

2. Can these fittings be used for vacuum?

Yes, they are vacuum resistant up to 28" Hg and suitable for vacuum applications.

3. How often can they be assembled and disassembled?

As often as desired, as long as the components remain undamaged. The sealing and gripping performance is maintained.

4. Is sealant needed?

Not at the tube connection. For threaded connections, PTFE tape or a suitable sealing paste can be used.

5. Are food-grade versions available?

Yes, special variants are available for food and beverage technology.

6. Can they be used outdoors?

Yes, the housing material is UV-resistant and weather-resistant. For extreme conditions, special seals can be chosen.

7. What to do in case of contamination?

Clean with a soft, dry cloth. Do not use aggressive cleaning agents.