Mechanisms — butterfly valve

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Disc Valve for Large Gas Pipes diagram
Disc Valve for Large Gas Pipes
Disc valves shut off and throttle large gas pipelines using a rotating disc. Learn sizing, Cv, torque, and failure modes for transmission and utility service.
Throttle Valve diagram
Throttle Valve
How a Throttle Valve regulates fluid flow in engines, hydraulics, and HVAC — working principle, sizing formula, worked example, and failure modes from FIRGELLI.
Butterfly Valve diagram
Butterfly Valve
Butterfly valve explained — disc geometry, torque calculation, seat selection and sizing for water, HVAC, oil & gas, and process pipelines.