closing-unit pump

closing-unit pump

[′klōz·iŋ ¦yü·nət ‚pəmp]
(petroleum engineering)
A pump installed on an accumulator to control operation of the blowout preventers by pumping hydraulic fluid to them under high pressure.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.