Valve Types

While at a training session recently a valve type was mentioned that I found unfamiliar. Here is some clarification:

Globe valve - this is a valve which is named for the shape it used to be constructed in, round like a globe. I was confused as to what the difference between the Globe and Ball valve was, as I would image the similarity in names. however the globe is named by its OUTSIDE shape, whereas the ball is so named for it inner shape. the flow is controlled by a ball with a hole in it, when the ball turns, so flow is restricted. In a globe valve, there is a chamber, which has a physical partition in the middle with a horizontal plate with a circular hole in it. A cylindrical plug is what causes the reduction in flow, which will be controlled by a screw in manual valves, or an actuator assembly in automatic valves. The plug moves perpendicular to the flow, coming from the wall of the pipe to the centre of the chamber, to sit on the plate when the valve is fully closed.