Ball, Butterfly and Gate valves essentially perform the same function. However, their structural qualities are different. Ball valves have a stem and ball, which turns horizontally, and are commonly referred to as “rotational” valves. Butterfly valves have a stem and a disc, which function very similiar to a ball valve. They are best suited to applications requiring on/off control without pressure drop. Gate valves open by lifting a rectangular gate (or wedge) out of the path of the fluid
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