The fully welded ball valve and the ordinary ball valve have significant differences in structure, characteristics, and applications.

1. Structural Differences

Fully Welded Ball Valve: The fully welded ball valve adopts a fully welded structure, with no gaskets between the valve body and valve body, and is welded as a whole. This eliminates the need for gaskets or packing typically required in traditional ball valves.

Ordinary Ball Valve: The valve body and valve seat of the ordinary ball valve are sealed by threaded connections or gaskets, usually requiring the use of packing or gaskets to ensure sealing.

2. Sealing Performance

Fully Welded Ball Valve: Due to its fully welded structure, the fully welded ball valve offers stronger sealing performance, effectively preventing leaks, particularly suitable for high-temperature, high-pressure, and corrosive media.

Ordinary Ball Valve: The sealing performance of the ordinary ball valve is relatively weaker and susceptible to damage or aging of packing or gaskets, leading to potential leaks.

3. Pressure Resistance

Fully Welded Ball Valve: With its fully welded structure, the fully welded ball valve offers higher pressure resistance, capable of withstanding higher pressures.

Ordinary Ball Valve: The pressure resistance of the ordinary ball valve is typically moderate, limited by threaded connections or gaskets.

4. Maintenance and Repair

Fully Welded Ball Valve: Repairing the fully welded ball valve is relatively challenging. Once issues arise, it may require replacing the entire valve body or valve seat, resulting in higher maintenance costs.

Ordinary Ball Valve: Repairing the ordinary ball valve is relatively straightforward. It can be repaired by replacing gaskets or packing, resulting in lower maintenance costs.

5. Application Range

Fully Welded Ball Valve: The fully welded ball valve is suitable for high-temperature, high-pressure, and corrosive media environments, such as in the petroleum, chemical, and natural gas industries.

Ordinary Ball Valve: The ordinary ball valve is suitable for general industrial and domestic sectors, with relatively lower requirements for the working environment.

Overall, fully welded ball valves offer stronger sealing performance, higher pressure resistance, and longer lifespan, making them suitable for harsh working environments. On the other hand, ordinary ball valves are suitable for general industrial and domestic applications, with advantages such as simple maintenance and lower costs. When choosing between the two, a comprehensive evaluation based on specific project requirements and economic considerations is necessary.