Danfoss Waltech L Series Hydraulic Fittings (Up to 400 bar)

The L Series provides a versatile range of bite‑type compression fittings engineered to handle pressures up to 400 bar for smaller diameters and 250 bar for larger sizes, in conformity with DIN 2353 / ISO 8434‑1 standards. Crafted from mild carbon steel with Guardian Seal plating (a C6F-style zinc-based, Cr(VI)-free coating), each fitting offers excellent corrosion resistance with easy assembly and long-term reliability.

• Duty Class: Light Duty (L Series)
• Tube Outer Diameter Range: 6 mm – 42 mm OD
• Typical Pressure Ratings: 6–18 mm OD → up to 400 bar & 22–42 mm OD → up to 250 bar
• Base Material: Mild carbon steel (low-carbon steel)
• Coating: C6F / Guardian Seal zinc-based, Cr(VI)-free corrosion protection
• Standards: Manufactured to DIN 2353 and compliant with ISO 8434-1
• Design: Supplied complete with cutting ring and nut; bite-type connection

The Light Duty (L Series) is the most versatile of the Waltech hydraulic fitting ranges, designed for medium-to-high pressure hydraulic systems where reliability, easy assembly, and global standard compliance are essential. Covering tube sizes from 6 mm to 42 mm OD, it’s suited to a wide variety of industrial and mobile applications.

Typical Use Cases

• Industrial Hydraulic Machinery – Presses, machine tools, conveyors, and automation equipment operating at pressures up to 400 bar.
• Agricultural Equipment – Tractor hydraulics, sprayers, balers, and loader control systems where medium-pressure performance is needed.
• Construction Machinery – Backhoes, skid steers, road rollers, and other plant equipment requiring durable connections with resistance to vibration.
• Marine & Offshore Systems – Steering hydraulics, deck machinery, and support systems where corrosion resistance is important.
• Material Handling Equipment – Cranes, forklifts, and telescopic handlers with medium-pressure control circuits.
• Energy Sector Installations – Wind turbine pitch control systems, hydraulic gates, and small hydroelectric plant mechanisms.

Why Choose L Series for These Applications?

• Pressure Flexibility – 400 bar rating for smaller tube sizes, 250 bar for larger diameters.
• Wide Compatibility – Fits seamlessly into DIN 2353 / ISO 8434-1 tube systems for global interchangeability.
• Bite-Type Seal Integrity – Ensures leak-free performance even under vibration and pulsating pressures.
• Corrosion Resistance – Guardian Seal (C6F) coating provides extended service life in challenging environments.
• Ease of Installation – Simple manual assembly without specialist tools for most applications.

• Male Stud Coupling (BSPP/BSPT/NPT variants) - Enables direct connection between metric tube and female-threaded ports (e.g., valves or manifolds). Commonly used in hydraulic circuits where threaded interface is required. Available in various OD-thread size combinations.
• Equal Straight Connector (Tube-to-Tube Union) - Joins two tubes of equal diameter, enabling extension or repair of hydraulic lines without altering layout.
• Equal Elbow - 90° elbow for equal OD tubes, facilitating tight routing and clean, compact installations.
• Equal Tee - Distributes media flow into three equal branches.
• Adjustable & Swivel Connectors -  Offer flexibility during assembly with angular adjustment or swivel action.
• Male Stud Coupling, Form E Metric -  Features metric parallel thread and stud face for equipment mating.

Ensure airtight, safe, and durable connections by following this streamlined assembly approach:

1. Tube Preparation - Use a tube cutter or fine saw for a clean, square cut. Remove burrs and ensure outer surface is clean.
2. Component Setup - Slide the nut and cutting ring onto the tube. Push the tube into the fitting body until it seats firmly.
3. Initial Tightening - Hand-tighten the nut until it is snug. Then, using a wrench, tighten according to applicable DIN 2353 guidelines for light-duty — typically around 1 to 1.5 turns beyond finger-tight, but always refer to official torque tables.
4. Verify Bite Integrity - If pre-assembled, slip the fitting apart and check for a continuous bite ring marking. Reassemble and tighten until a stop or pressure point is felt.
5. In-System Installation - Fit the assembly into the hydraulic system and apply the final torque as per specification. Avoid over-tightening to prevent damage to ring or tube.

Tips for effective assembly:

• Always match tube material and dimensions to fittings to ensure compatibility.
• Discard tubes with deformed or incomplete bites.
• For greasy or difficult slides, ensure the components are clean — no lubrication needed for Guardian Seal-plated steel.