Industrial Rotary Valves

rotary valves
(Rotary Valve) A disc type valve operated by a lever system today mostly used on brasswinds of central and eastern European manufacture and almost universally used on French horns.
(Rotary valve) A type of valve used in 2 & 4 stroke engines which, as it rotates, opens & closes gas passageways. Usually a disc, conical or cylindrical in shape & normally found on inlet systems
A rotary valve is a type of valve in which the rotation of a passage or passages in a transverse plug regulates the flow of liquid or gas through the attached pipes. The common stopcock is the simplest form of rotary valve.

industrial
Of, relating to, or characterized by industry
Having highly developed industries
having highly developed industries; "the industrial revolution"; "an industrial nation"
of or relating to or resulting from industry; "industrial output"
Designed or suitable for use in industry
suitable to stand up to hard wear; "industrial carpeting"