Pneumatic fittings, the "vascular connectors" of industrial pneumatic systems

Introduction
The pneumatic connector is a crucial component for connecting pneumatic components (such as cylinders, valves, and pipelines), and is known as the "vascular connector" of the pneumatic system. It is responsible for ensuring efficient and leak-free transmission of compressed air within the system.

Core functions and design features The primary function of a pneumatic connector is to facilitate quick, reliable, and well-sealed connections and disconnections. Its design typically includes:

• Check valve mechanism: It automatically seals when disconnected, preventing air leakage and external dust from entering.

• Locking mechanism: such as steel ball collars, clamps, or threads, to ensure a secure connection.

• Seals: Commonly used are nitrile rubber (NBR) or fluororubber (FKM) O-rings to accommodate different media and temperatures.

main types

1. Quick-connect coupling: The most commonly used type, which achieves one-click connection by pushing into the pipeline, suitable for PU and nylon tubes.

2. Threaded connector: It connects to the component port through external or internal threads, with sealing achieved by an O-ring on the end face or taper pipe threads (PT/NPT).

3. Quick-change connector: Equipped with a self-locking function, it provides bidirectional sealing when disconnected, making it commonly used in situations where tools need to be frequently changed.

4. Rotating joint: Allows the pipeline to rotate 360° while connected, preventing kinking.

Key parameters for model selection

• Interface dimensions: pipe diameter (such as Φ6, Φ8) and thread specification (such as G1/8, NPT1/4).

• Flow rate (Cv value): It affects the system's response speed and needs to match the requirements of the actuator.

• Working pressure range: Typically 0-1.0 MPa.

• Medium and temperature: It needs to be compatible with the sealing material (e.g., NBR is suitable for air, while FKM is resistant to high-temperature oil).

• Body material: Brass, stainless steel, or engineering plastic, selected based on corrosion resistance and strength requirements.

Application areas
It is widely used for pneumatic circuit connections in fields such as automation equipment, packaging machinery, automobile manufacturing, and food processing.

Maintenance points
Regularly inspect the wear of seals and check for cracks in connectors. Ensure that the pipeline cuts are smooth and free of burrs before connecting.