Based on their structure and application, ferrule-type fittings are primarily categorized as follows:
1. Ferrule-flange fittings: These combine a ferrule connection with a flange connection and are primarily used in applications requiring high sealing performance.
2. Ferrule-submerged arc welded fittings: Typically used in systems with high pressure or large-diameter piping, these offer advantages such as connection stability and excellent sealing.
3. Ferrule-screw-lock fittings: These utilize a combination of a ferrule and a threaded locking mechanism, characterized by a tight connection and ease of assembly and disassembly.

