Pipe expanders are tools designed for changing the diameter of the ends of pipes, ensuring precise connection and assembly of piping systems. They are widely used in construction, plumbing, and other industries where the installation and fitting of pipes are required to ensure proper connection and sealing.

Here are the key characteristics and functions of pipe expanders:

1. Adjustable Diameter: Pipe expanders typically have an adjustable mechanism that allows for changing the diameter of pipe ends to meet project requirements.

2. Types of Expanders: There are several types of expanders for different purposes, including internal and external expanders. Internal expanders are used to increase the diameter of the inner ends of pipes, while external expanders are used to increase the diameter of the outer ends of pipes.

3. Materials: Pipe expanders can be made from various materials, including steel, aluminum, or plastic, depending on the type of pipes and the task.

4. Applications in Plumbing: Pipe expanders are used in plumbing to fit pipe connections, ensuring the tightness and reliability of water supply and drainage systems.

5. Applications in Construction and Metalworking: They are also applied in construction and metalworking for the assembly and connection of pipelines and pipes.

Pipe expanders are essential tools that enable precise fitting and assembly of piping systems, ensuring proper connection and sealing, which is crucial for the efficient operation of water supply, heating, and other plumbing systems.