Linear flow turn down valve

摘要: A linear turn down metering valve for gaseous fuels comprises a body having frustoconical chamber receiving rotatable plug and including an inlet on one side outlet at end opposite control shaft the end. The is about central axis aligned coaxially with adjacent outlet. includes annular wall defining bore normally closes off when in "off" position. formed maximum flow, port movable into alignment initially rotated out of position to flow pair generally transversely oriented divergent/convergent passages spaced from providing decreasing area overlapping as through range intermediate, angularly positions linearly gas rates until reaching minimum rate range. also separate passage system communication adjustable sleeve fuel beyond intermediate