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    Tube Fittings

    What's the Push-in Tube Fittings? (Also called as one-touch fittings )

    Push-in tube fittings are quick-connect components that we designe for usage in pneumatic systems, allowing easy and reliable connections between tubes and components. We widely use it in industries like automation, manufacturing, and transportation due to their ease of installation and maintenance.

    We also call it as one touch tube fitting, tube connector etc.

    They provide a leak-free means of easily connecting hoses in your compressed air system. Fittings can have between 1-6 inlet/outlet ports, and the material could be plastic, brass and stainless steel.

    The Structure Of Tube Fittings

    Typical Structure

    Typical Push-in Tube Fitting Structure

    A typical quick-connect push-in tube fitting have six main elements: the connecting body, the sleeve button, the collar, the lock claw collet, the back ring, and the O-ring.

    The connetor body: holds the fitting set together and gives air a chamber to pass through. (Or water, as we also use these fittings in water line)

    The sleeve button: allows insert the tube into the joint smoothly. When pulling out the tube, you only need to press the sleeve button and pull out the tube.

    The collar: brass or zinc alloy material. It’s in charge of fixing the fitting sets into the connector body.

    The lock claw collet: normally made by the spring steel, provides the teeth for the fitting to bite down on the tubing and keep in securely in safe position.

    The back ring: the material is POM, it works as a bracket to prop up the claw collet.

    The O-ring: provides the fittings with a tight seal with the hose.

    Simplified Version Structure

    Simplified Version Structure

    Another commonly used quick-connect push-in fitting which was developed by the famous pneumatic supplier-Camozzi. It’s comprised of three elements: the connecting body, the sleeve button, and the sealing O-ring.

    The metal body:

    Holds the fitting set together and gives air a chamber to pass through. (Or water, as these fittings can also be used in water line)

    The sleeve button: 

    Different from the traditional sleeve nut of tube fitting, it integrates the traditional sleeve nut, collar, lock claw collet and back ring into one accessory.

    The O-ring:

    Provides the fittings with a tight seal with the hose.

    How does the tube fittings work?

    Mechanism

    Insertion of the Tube:

    We push the tube into the fitting’s collet, therefore needs a mechanism that grips and secures the tube.

    The collet typically consists of a series of metal or plastic teeth that latch onto the outer surface of the tubing.

    Seal Formation:

    An internal O-ring inside the fitting ensures a tight seal around the tube.

    As the tube is inserted, it compresses the O-ring, forming a leak-proof connection.

    Retention:

    The collet’s teeth dig slightly into the tube to prevent it from pulling out under pressure or stress.

    The gripping strength is sufficient to withstand high-pressure systems, depending on the fitting’s rating.

    Releasing the Tube

    • Push-in fittings feature a release ring or collar.
    • By pressing this release ring, the collet’s teeth retract, allowing the tube to be easily removed without damage.

     

    Our Tube Fittings Product Line

    Push In Tube Fittings

    Push In Tube Fittings

    The normal purpose tube fittings, we use it to connect the air source, the valves, cylinders and other components.

    The pipe size could be inch or metric size. And the NPT, BSP, Metric thread are all available. And different body color is optional.

    Materials: Fitting body: PPT- PP plastic combined with certain percent of with glass fiber. The sleeve button: Polyformaldehyde. Metal parts: Brass with nickel plated or stainless steel.

    Spec Sheet
    Compact Push In Tube Fittings

    Compact Tube Fittings

    Compact tube push-in fittings are a specialized type of push-in fittings we designe for applications where space constraints and efficient performance are critical. 

    They allow for efficient installation in equipment with limited room. 40% of the standard fittings volumn.

    Minimum thread size: M3*0.5; minimum pipe size: 3mm (OD).

    Spec Sheet
    Push-in-Speed-Controllers.jpg

    Push in Speed Controllers

    They are essential components in pneumatic systems, allowing precise control over the speed of actuators, such as cylinders. They incorporate a push-in fitting mechanism and a control knob to regulate airflow. Available in meter-in or meter-out types:

    Meter-in: Controls the air entering the actuator.

    Meter-out: Controls the air exiting the actuator, ensuring smooth operation.

    Spec Sheet
    Brass-Push-In-Tube Fittings

    Brass Tube Push-In Tube Fittings

    Simplified Version Structure! Made primarily from high-quality brass, these fittings are designed to handle demanding environments, offering robust performance and corrosion resistance. 

    Pressure and Temperature Resistance: Capable of operating under high pressures and temperatures.

    • Corrosion Resistance: Brass material resists rust, making it ideal for applications involving water, air, or other corrosive media.
    Spec Sheet
    Stainless Steel Push In Tube Fittings

    Stainless Steel tube fittings

    Typical Push-in Tube Fitting Structure

    Durable and corrosion-resistant connectors commonly used in applications where hygiene, strength, and resistance to harsh environments are critical. Specifically suitable for high-pressure and high-temperature environments, depending on the fitting specification.

    Material: Typically made from stainless steel grades such as 304 or 316, therefore offering excellent corrosion resistance.

    Applications: Often used for transporting gases, liquids, and chemicals in cleanroom or high-purity environments.

    Spec Sheet
    Air-Control-Valves.jpg

    Pilot-operated check valve

    It is a type of check valve designed to allow flow in one direction under normal conditions and to permit reverse flow when pilot pressure is applied. Thus this valve is widely used in controlled backflow or system safety is essential.

    • Backflow Prevention: Always ensures fluid only flows in one direction unless the pilot is actuated.
    • Versatility: Can be overridden for reverse flow as needed.
    • Space-Saving: Combines two functions (check valve and pilot valve) into one unit, saving space in a system.
    Spec Sheet
    Plastic Push In Ball Valves

    Plastic Push In Ball Valves

    Plastic Push-In Ball Valves are a type of valve that combines the simple operation of a ball valve with a push-in fitting, making them easy to install and remove in fluid or gas systems. 

    • Ease of Installation: Tool-free installation saves time and reduces labor costs.
    • Leak-Proof Design: Push-in fittings often provide a secure, leak-free seal.
    • Chemical Resistance: The use of plastics like PVC or polypropylene makes these valves resistant to a variety of chemicals.
    Spec Sheet
    Push In Check Valves

    Push In Check Valves

    Push-In Check Valves are simple, compact, and easy-to-install valves, we designe it to allow flow in one direction while preventing backflow in systems.

    Media: These valves are ideal for fluid, air, or gas systems, and are widely used in applications where quick installation and minimal space are required. The “push-in” design refers to the method of connecting tubing to the valve without the need for tools and providing a fast and secure connection.

    Spec Sheet
    Push-In-Manual-Control-Valves.jpg

    Push In Manual Control Valves

    Push-In Manual Control Valves are a type of valve used for regulating the flow of liquids or gases in a system. These valves combine the simplicity and ease of a push-in connection with the ability to manually control the flow. Therefore they’re commonly used in pneumatic, fluid, or air systems where precise manual control is essential for turning flow on or off, or for regulating the flow rate.

    Typically have lower pressure and temperature tolerances compared to their metal counterparts, so it’s important to verify their suitability for your application.

    Spec Sheet
    Push in Rotary Joint Tube Fittings

    Push in Rotary Joint Tube Fittings

    Push-In Rotary Joint Fittings are components used in rotary or rotating equipment, such as machines, vehicles, and automated systems, where a rotating part needs to maintain a continuous connection for fluid or gas transmission.
    Quick connect: These fittings allow the passage of media (like water, air, hydraulic fluid, or steam) through a rotating interface without leakage, additionally the push-in design simplifies the connection process.
    Spec Sheet
    Push In Stop Tube Fittings

    Push In Stop Tube Fittings

    Push-In Stop Fittings are a type of plumbing or fluid control component used to quickly and securely block the flow of a liquid, gas, or air in a piping or tubing system. The “push-in” design simplifies installation by allowing tubing to be inserted into the fitting without requiring tools or threading, providing a fast and leak-resistant connection.

    Used in various industries: including pneumatic systems, water treatment, and fluid handling, where the ability to stop the flow of media in a specific part of a system is necessary.

    Spec Sheet

    How Do You Select a Push-In tube fitting?

    1. Application Requirements

    Medium:

    Air: Ensure fittings are compatible with the system’s pressure and temperature.

    Liquids: Select fittings made of materials resistant to the liquid’s chemical properties (e.g., stainless steel for corrosive fluids).

    Gases: Verify the fitting’s leak-tightness and material compatibility.

    Pressure:

    Confirm the fitting’s pressure rating aligns with your system’s operating pressure.

    Temperature:

    Ensure the material can withstand the system’s temperature range.

    2. Material Compatibility

    Body Material: Choose between brass, stainless steel, aluminum, or plastic based on application requirements:

    Brass/Chrome-plated Brass: Durable and commonly used in general applications.

    Stainless Steel: Ideal for corrosive environments, high purity, or cleanroom use.

    Plastic (Nylon, Acetal): Lightweight and cost-effective, suitable for low-pressure systems.

    Seal Material: Verify the type of O-rings used (e.g., NBR, FKM, EPDM) for compatibility with the medium and temperature.

    3. Tubing Type

    Check the fitting’s compatibility with the tubing material and outer diameter (OD):

    Common Tubing Materials: Polyurethane, polyethylene, nylon, PTFE, or PFA.

    Ensure a proper seal between the fitting and tubing.

    4. Fitting Configuration

    Select a configuration based on system layout and connection needs:

    Straight Connectors

    Elbow Connectors

    Tee or Cross Connectors

    Bulkhead Fittings (for wall mounting)

    Reducers (for different tubing sizes)

    5. Mounting Style

    Threaded Connections: Choose between BSP, NPT, or other thread types to ensure compatibility with the system.

    Panel Mounting: Use fittings with locking nuts for secure attachment.

    6. Functional Features

    Swivel Feature: Allows rotation for flexibility in tight spaces.

    Release Mechanism: Quick-release collars for easy disconnection.

    Locking Mechanism: Prevents accidental disconnection.

    7. Certification and Standards

    Look for compliance with industry standards for safety and performance:

    ISO 14743: For pneumatic systems.

    FDA Approval: For food and beverage applications.

    Cleanroom Certification: For semiconductor or pharmaceutical industries.

    8. Environmental Considerations

    Corrosive Environments: Use corrosion-resistant materials like stainless steel.

    Outdoor Applications: Ensure UV and weather resistance.

    Hygienic Requirements: Select designs with smooth surfaces and minimal crevices to prevent contamination.

     



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