Assertion: valve | /r/HasProperty | natural object
Facets:
value: by opening
type: MANNER
value: by closing
type: MANNER
value: by obstructing
type: MANNER
Source sentences:
text: A valve is a device or natural object that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways.