PART 7 Flashcards
The annular chamber provided around a valve stem in a sealing system into which deformable packing is introduced.
stuffing box
A valve used underwater, generally in a manifold that will close and isolate a particular pipeline or process in an emergency.
subsea isolation valve
The transient sudden rise or fall of pressure in a pipeline.
surge
A valve designed to relieve pressure surges in pipelines carrying liquids, thus preventing line rupture due to transient pressures exceeding design limits of the pipe
surge reliever
A tool for bending or forming cold metal to a required shape.
swage
A check valve in which the closure element is a hinged clapper that swings or rotates about a supporting shaft.
swing check valve
A flange consisting of two parts—a hub and a ring.
swivel flange
The intentional restriction of flow by partially closing or opening a valve
throttling
An expression characterizing valves when in the open position, wherein the bore presents a smooth uninterrupted interior surface across seat rings and through the valve port, thus affording minimum pressure drop.
through-conduit
The design of a particular valve or regulator where the unit can be serviced or repaired by leaving its body in the line and accessing its internals by removing a top portion of the unit.
top entry
The part of a ball valve that holds the ball on a fixed vertical axis and about which the ball turns.
trunnion
The random flow of a fluid in which the velocity at a certain point in the fluid varies irregularly.
turbulent flow
A nondestructive evaluation (NDE) inspection procedure that uses high-frequency sound waves to detect voids and imperfections of metal parts.
ultrasonic inspection
A small variable profile valve put in a flowline and used with a pilot to restrict the flow into the pilot and make the pilot more or less sensitive to changing conditions.
variable orifice
A special pipe plug having a small Allen-wrench-operated vent valve.
vent plug
