Crane Butterfly Valve

There is Crane Butterfly Valve utilizes a patented seal which provides bi-directional bubble tight shutoff. It is a valve consisting of a disk rotating on an axis across the diameter of a pipe to regulate the flow, as in the throttles of many engines. Butterfly valves are a family of quarter-turn rotational motion valves that are used in pipelines to shut-off flow. It is often said that butterfly valves can be used to regulate the flow. Crane Butterfly Valve is a rotary valve in which a disk-shaped seating element is rotated 90 to open or close the flow passage.