Vacuum partial pressure control system is composed of computer system, vacuum modulation valve and partial pressure pump, of which the valve is one of key parts of the equipment.

真空偏压控制系统由计算机系统、真空调节阀、真空偏压泵等部件构成，其中真空调节阀是设备的关键部件之一。

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At certain points during the screening I attended, when the action was interrupted by major eruptions of information, a sealed chamber under partial vacuum might have described the screening room.

WSJ: Plot's Knots Bedevil 'Angels & Demons'

Among the movie's many revelations is the fact -- I'm taking the factuality on faith -- that the Vatican library's most treasured manuscripts are stored in sealed chambers under a partial vacuum.

WSJ: Plot's Knots Bedevil 'Angels & Demons'