A butterfly valve actuator controls the flow of gas or liquid by means of a disk, which turns on a diametrical axis inside a pipe or by two semicircular plates hinged on a common spindle, which permits flow in only one direction.
Butterfly valves are often distinguished by the three main types: zero, double, or triple offset.
- Zero Offset Butterfly Valves.
- Double Offset Butterfly Valves.
- Triple offset butterfly valves.