The difference between threaded ball valve and flange ball valve？

Threaded valves are actually divided into two types, one is internal threaded valves and the other is externally threaded valves. 

The thread refers to a spiral shape with continuous convex parts. Threaded valves are often threaded with pipes, 

but they are only suitable for low pressure.

Flange valves refer to valves whose connection method is flange connection. Flange connection is to first fix the pipes on different flanges, 

add flange pads, and use bolts to connect the two flanges to play the role of connection.