Butterfly Valves are among the family of quarter - turn valves and work very similar to ball valves. The Butterfly is a disk connected to rod, it closed whe the rod rotates the disc by a quarter turn a position perpendicular to the flow direction. When a valve opens, the disk is rotated back to allow the flows.
Butterfly Valves are used for on-off of modulating services and are popular due to their light weight, small instalation foot print, lower cost, quick operation and availability in very large size. These Valves can be operated by handles, gears or automatic actuators.
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