A ball valve consists of a floating ball with a ho...MORE >>
In real life, there are many places we need to use valv […]
In real life, there are many places we need to use valves. We'll talk about two common valves below.
Ball valves and butterfly valves are both quarter-turn (90-degree turn from fully opened to fully closed) rotary valves. The family of rotary valves also includes cone and plug valves. They are used to control the flow of most types of gases or liquids across a wide range of temperatures and pressures.
Butterfly and ball valves are both popular for their relatively low cost, long service life and dependability. However, there are a few differences to help the user choose between them.
Butterfly valves are less expensive and generally lighter weight than other types of valves. A butterfly valve for a large diameter pipe is much smaller than its ball valve equivalent.
Butterfly valves do not seal as completely as ball valves and are rarely used to control gas flows. Ball valves provide a reliable seal.
In high pressure applications, the ball valve will provide superior cut-off characteristics as well as having no trouble turning or needing a pressure-balancing scheme.