دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: see valve.

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.

n: a device used to control the rate of flow in a line to open or shut off a line completely, or to serve as an automatic or semi-automatic safety device. Those used extensively include the check valve, gate valve, globe valve, needle valve, plug valve, and pressure relief valve.

any of several valves: plug, gate, butterfly, needle, etc., used in oil field operations.