دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a globe valve that contains a sharp-pointed, needle like plug that is driven into and out of a cone-shaped seat to control accurately a relatively small rate of fluid flow. In a fuel injector, the fuel pressure forces the needle valve off its seat to allow injection.

a low volume, small orifice, high pressure bleed valve.