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What are ball valves and butterfly valves?

- Feb 28, 2018 -

Ball valves use a rotating sphere as the control element, with a hole through it the same diameter as the pipe. They are intended as isolation valves:

Ball valve

A buttefly valve is similar to a throttle in a carburettor. It is used to give a degree of proportional control to a flow

Butterfly valve

The third kind of valve is a gate valve, which like a ball valve is used for shutting off flow:

gate valve

Incidentally, a globe valve is not the same as a ball valve, despite what google thinks.

A ball valve uses a ball as the closing element. A Globe valve has a screwdown valve inside a globular enclosure. The are used as stop valves in high pressure systems, like steam globe valve

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