What is ORFS Fitting: The Complete Guide 2025

An ORFS fitting (O-Ring Face Seal fitting) is a hydraulic fitting commonly used in fluid and gas transfer systems. These fittings are designed to prevent leaks, offering a secure connection between pipes or hoses.

The O-ring, located on the face of the fitting, creates a seal with the surface of the counterpart fitting, providing a leak-free interface.

ORFS fittings are known for their durability, versatility, and resistance to high pressures, making them ideal for use in a variety of industrial applications.

If you have any questions about ORFS fittings or need assistance with selecting the right components, feel free to contact us directly. We’re happy to help with any inquiries regarding our products or services.

What is Orfs Fitting?

ORFS fittings are essential components used to connect pipes, tubes, or hoses in hydraulic systems. These fittings feature a smooth, flat surface that, when coupled with a compatible fitting, forms a reliable seal using an O-ring.

Key Features of ORFS Fittings:

• Leak-proof design: The O-ring seated on the face of the fitting prevents any leakage under pressure.
• High pressure resistance: ORFS fittings are designed to withstand high-pressure hydraulic systems, making them popular in industries like construction, agriculture, and manufacturing.
• Versatility: These fittings are available in various sizes, materials, and configurations, allowing for widespread use in different environments.

Common Applications of ORFS Fittings:

• Hydraulic systems: ORFS fittings are most commonly used in hydraulic systems where leak prevention and high-pressure resistance are crucial.
• Fluid systems: In industries like automotive, oil and gas, and manufacturing, ORFS fittings are used to ensure tight connections between hoses and tubes.
• Industrial machinery: Used in machines where fluid movement is required, ORFS fittings help to secure connections and maintain system integrity.

ORFS Fitting Sizes

The size of an ORFS fitting is essential to ensure a proper fit within the hydraulic system. ORFS fittings are available in various sizes, which can affect both the pressure rating and the flow capacity of the system.

Here’s a table summarizing the common ORFS fitting sizes:

Note: These sizes are common, but additional sizes and dimensions may be available depending on the manufacturer.

How to Measure ORFS Fittings?

Measuring ORFS fittings correctly is essential to ensure compatibility with your hydraulic system. The process requires you to determine several key dimensions, including the thread size, the O-ring size, and the outside diameter (OD) of the fitting.

Step 1: Measure the Outside Diameter (OD)

The first measurement you need is the OD of the fitting. Using a caliper, measure the outside diameter of the fitting’s male or female end to get an accurate reading.

Step 2: Check the Thread Type

Next, check the thread type of the fitting. ORFS fittings generally use straight threads. You’ll need to measure the thread pitch and determine the thread form to ensure compatibility.

Step 3: Measure the O-Ring Size

The O-ring that seals the ORFS fitting is crucial to the leak-proof design. Measure the internal diameter of the O-ring and its cross-sectional thickness. These measurements will help you select a compatible O-ring when replacing or installing fittings.

Step 4: Identify the Dash Size

Finally, check the dash size, which is a standard way of representing the size of hydraulic fittings. This number (e.g., -4, -6, etc.) is based on the fitting’s size in 1/16-inch increments.

How to Install ORFS Fittings

Installing ORFS fittings correctly is crucial to maintaining a leak-free and secure hydraulic system. Follow these steps carefully:

Step 1: Prepare the System

Before installation, ensure the hydraulic system is depressurized and free of any fluid. Inspect the fitting, hose, and O-ring for any damage, and clean all parts thoroughly.

Step 2: Install the O-Ring

Place the O-ring onto the fitting’s sealing surface, making sure it sits evenly and securely in the groove. Avoid stretching or damaging the O-ring during installation.

Step 3: Connect the Fittings

Align the male and female parts of the ORFS fitting. Thread the male fitting into the female fitting by hand, ensuring the threads are properly aligned to prevent cross-threading.

Step 4: Tighten the Fitting

Using the appropriate wrench, tighten the fitting to the recommended torque specifications. Avoid over-tightening, as this can damage the O-ring or fitting threads.

Step 5: Test the Connection

Once the fitting is installed, check the connection for any leaks by pressurizing the system. If any leaks are detected, re-tighten or replace the O-ring as necessary.

Key Considerations When Using ORFS Fittings

When working with ORFS fittings, there are several important considerations to ensure optimal performance:

• Material Compatibility: Choose fittings made from materials compatible with the fluids in your system (e.g., stainless steel for corrosive fluids).
• Torque Specifications: Always follow the manufacturer’s torque specifications to avoid damage to the fitting and O-ring.
• Proper O-Ring: Always replace O-rings with ones that meet the required size and material specifications to ensure leak-proof connections.
• Maintenance: Regularly check fittings for signs of wear, corrosion, or damage. Replace parts as needed to maintain system integrity.

Conclusion

In conclusion, ORFS fittings play a vital role in hydraulic systems by ensuring secure, leak-free connections. By understanding their sizes, how to measure them, and how to install them properly, you can ensure the longevity and efficiency of your hydraulic system. If you have any questions or need further assistance, feel free to contact us directly.

If you are interested in our products, visit our homepage or request a product catalog from us. We provide custom solutions and have a full range of ORFS hydraulic fittings to meet your needs.

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