Valve Connection Types – Industrial Overview

1. Flanged Connection  

   • Standard choice for lines >DN50.  

   • Enables easy installation/removal and accommodates a wide range of nominal sizes and pressure ratings.  

   • Flange face finish (RF, RTJ, FF, etc.) is selected according to service conditions.

2. Welded Connection  

   • Suited for high pressure/temperature and aggressive services.  

   • Provides superior integrity compared with flanges; however, disassembly is labor-intensive.  

   • Typically specified for long-life or critical services such as power plants, nuclear facilities and ethylene units.

3. Threaded Connection  

   • Used mainly for small-bore valves (≤DN50).  

   • Ideal where welding is impractical or frequent removal is required.  

   • Threaded joints >DN50 are permissible only for non-hazardous fluids; torque control becomes difficult, limiting widespread use.

4. Compression (Ferrule) Connection  

   • Relies on the cutting edge of the ferrule to bite into the tube wall, ensuring leak-tight sealing of high-pressure systems.  

   • Advantages: vibration resistance, compact design, easy maintenance, fire-safe and explosion-proof characteristics.  

   • Widely adopted in power, refining, chemical and instrumentation tubing.

5. Clamp (Tri-Clamp / Hygienic) Connection  

   • Fast, tool-free assembly offering superior system stability and thermal-expansion accommodation.  

   • Reduces piping stress and component damage; minimal installation space required.  

   • Preferred for sanitary applications and rapid-changeover operations in biopharma and food processing.