Swing-type check off er the least pressure drop and offer simple automatic closure; when fluid flow stops gravity and flow reversal closes valve.

旋启式止回阀压降最小，能够完全自动关闭，即在介质流动停止、重力和介质倒流的状态下自动关闭阀门。

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Propellant property and nozzle closure opening pressure have an important effect on the ignition transient.

推进剂的燃烧特性及喷管堵盖打开压强对点火升压过程有较大影响。

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Reversed flow is stopped or held in "check" by fluid backflow pressure which seats the closure device against the valve body.

倒流的流体通过倒流的流体压力将止回关闭装置与阀体紧密密封，从而实现阻止倒流的“止回”功能。

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Chrysler and GM are under pressure from senators to provide greater support for the dealerships that are facing closure with parking lots full of unsold cars.

VOA: standard.2009.06.04

The closure of live poultry markets in Beijing will put new pressure on an industry how to handle chickens ready to be sold but that have no buyers.

FORBES: H7N9 Bird Flu Cases Rise To 51 In China; Henan Province Reports First Two Illnesses

The relatives of John Knowles, who had suffered rib injuries in falls at his home in Edgware, say that the closure of another casualty department nearby has placed Northwick Park under "incredible pressure".

BBC: 'Horrific' waits at London hospital

EBRD, however, is under pressure from its western sponsors to ensure that Ukraine agrees to the eventual closure of Chernobyl.

ECONOMIST: More fall-out from Chernobyl