There are several different types of valves, each with its own specific functionality. Some common types of valves include:

1. Ball Valve: A ball valve uses a rotating ball with a hole in it to control the flow of fluid. It provides quick shut-off and is suitable for both on/off and throttling applications.

2. Gate Valve: A gate valve has a flat or wedge-shaped gate that moves up and down to control the flow of fluid. It provides a tight seal and is commonly used for on/off applications.

3. Globe Valve: A globe valve has a disc that moves up and down to control the flow of fluid. It offers good throttling capability and is often used to regulate flow.

4. Butterfly Valve: A butterfly valve uses a disc that rotates to control the flow of fluid. It is lightweight and compact, making it suitable for large flow applications.

5. Check Valve: A check valve allows fluid to flow in only one direction, preventing backflow. It is commonly used to prevent damage to pumps and other equipment.

6. Diaphragm Valve: A diaphragm valve uses a flexible diaphragm to control the flow of fluid. It is suitable for corrosive or abrasive fluids and provides tight shut-off.

These are just a few examples of the different types of valves available. The choice of valve depends on the specific application and the requirements of the system.