Butterfly Valves And Controls

butterfly valves
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 valve) a valve in a carburetor that consists of a disc that turns and acts as a throttle
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.
(BUTTERFLY VALVE) A valve with a circular body and a rotary motion disk closure member which is pivotally supported by its stem. Butterfly valves come in various styles including eccentric and high-performance valves.
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

controls
The power to influence or direct people's behavior or the course of events
The ability to manage a machine or other moving object
The restriction of an activity, tendency, or phenomenon
(control) power to direct or determine; "under control"
exercise authoritative control or power over; "control the budget"; "Command the military forces"
(control) a relation of constraint of one entity (thing or person or group) by another; "measures for the control of disease"; "they instituted controls over drinking on campus"