Butterfly Valve Pressure Drop

butterfly valve
A valve consisting of a pair of semicircular plates that are attached to a spindle across a pipe and hinged to allow flow only one way
a valve in a carburetor that consists of a disc that turns and acts as a throttle
(Butterfly Valves) A valve consisting of a cylindrical body with a rotating vane to control flow. Tight Shutoff is obtained by an elastomer body liner into which the vane seats.
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
A butterfly valve is a valve which can be used for isolating or regulating flow. The closing mechanism takes the form of a disk. Operation is similar to that of a ball valve, which allows for quick shut off.

pressure drop
Pressure Drop is Robert Palmer's second solo album, released in 1975. Palmer is backed by Little Feat and other musicians.
Pressure drop is a term used to describe the decrease in pressure from one point in a pipe or tube to another point downstream. "Pressure drop" is the result of frictional forces on the fluid as it flows through the tube. The frictional forces are caused by a resistance to flow.
"Pressure Drop" is a song recorded in 1969 by The Maytals for producer Leslie Kong. The song appears on their 1970 album Monkey Man (released in Jamaica by Beverley's Records) and From the Roots (released in the UK by Trojan Records).