Butterfly Valve

Butterfly valves are quarter turn operation. Operation can be achieved by either manual hand lever, gearbox or other actuator. By turning the stem through 90 Degrees, a disc rotates to achieve fully open or fully closed valve positions. Energization of the seat to seal interface is by the mechanical force transferred through the stem by the hand lever, however certain designs of butterfly valves also use the process pressure to assist in the energisation of the seal.

Further Information
Butterfly Valve - General Design Criteria
Standard Pressure Class Ratings / End Connections
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