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Butterfly valve: Quiz


Question 1: ________ the handle turns the plate either parallel or perpendicular to the flow of water, shutting off the flow.
Rigid bodyRotationEarthRotation around a fixed axis

Question 2: It accomplishes this by using a tightly fitting seal, i.e., gasket, ________, precision machined, and a flat valve face on the upstream and downstream sides of the valve.
ElastomerOzone crackingCarbon nanotubeO-ring

Question 3: The resilient butterfly valve, which uses the flexibility of ________, has the lowest pressure rating.
Natural rubberEnglandPolymerLatex

Question 4: As well as this, butterfly valves are used on firefighting apparatus and typically are used on larger lines, such as front and rear suction ports and tank to ________ lines.
TurbineGas compressorBernoulli's principlePump

Question 5: The "butterfly" is a ________ disc mounted on a rod.
Noble gasMetalNonmetalHalogen

Question 6: Unlike a ball valve, the disc is always present within the flow, therefore a ________ drop is always induced in the flow, regardless of valve position.
PressureTemperatureForcePressure measurement

Question 7: A butterfly valve is a ________ used for flow regulation in which the disc takes the form of disk.
ValveEngineDiesel engineInternal combustion engine


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