原文：
压力容器的安全泄放量是指压力容器在超压时为保证它的压力不再升高， 在单位时间内所必须泄放的气量。选用液化气专用阀应从以下几个方面考虑： （1）结构形式选用什么型式的，主要 决定于设备的工艺条件和工作介质的特性。如果容器的工作介质有毒，易燃易爆，则选用封闭式的安全阀。锅炉和高压容器以及安全泄放量较大而壁厚又不太富裕的中、低压容器{zh0}选用全启式安全阀。 液化气专用阀 （2）压力范围安全阀是按公称压力标准系列进行设计制造的，每种液化气专用阀部有一定的工作压力范围。选用时应按锅炉和压力容器的{zd0}允许工作压力选用合适的安全阀。 （3）排放量选用的液化气专用阀，其排量必须大于设备的安全泄放量，这样才能保证锅炉或压力容器超压时，开放能及时排出一部分介质，避免器内的压力继续升高。

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译文：
Pressure vessel safety discharge refers to the pressure vessel in overpressure when the pressure to ensure that it is no longer increasing, in unit time must be within the gas discharge. Special use liquefied gas valve should consider the following aspects: (1) what type of structure used, mainly on equipment, process conditions and the characteristics of the working medium. If the container of the working media of toxic, flammable and explosive, then use the valve closed. Boilers and pressure vessels and the safety discharge wall thickness but not too large and affluent, the low pressure vessel to choose a safety valve. Dedicated liquefied petroleum gas valve (2) pressure relief valve according to nominal pressure range of the standard series were designed and produced, each dedicated LPG Department, they have a valve pressure range. When used boilers and pressure vessels shall be the maximum allowable working pressure safety valve for the appropriate choice. (3) The use of liquefied gas emissions special valve, the displacement must be greater than the device's safety discharge, so as to ensure the boiler or pressure vessel overpressure, the open part of the medium can be discharged in time to avoid the pressure to rise inside .