Vacuum
electrical device which cleans surfaces by creating air suction
Valve
device that controls the flow of a liquid through a passage or a pipe; membranous flap that controls the direction and/or flow of bodily fluids
Vanadium Inhibitor
An organic and/or inorganic metal bearing chemical intended to chemically and/or physically combine with the compounds formed during combustion of heavy fuel oil to improve the surface properties of the treated ash compounds.
Vapor pressure
pressure caused as a result of the power of vapors spreading
Vapor recovery unit
A facility for collecting and condensing vapors of volatile products being loaded into open tanks at refineries, terminals, and service stations. The vapors are drawn into a collecting tank and by pressure and cooling are condensed to a liquid. VR units significantly reduce air pollution by petroleum vapors.
