1.干气密封选用原则(1)被输送的介质是否有害有毒,是否允许有轻微外泄;(2)被输送介质的温度范围大小,压力等级要求;(3)使用环境是否防暴,若工作环境防暴等级要求很高,如周围有易燃、易爆的介质或者设备,则对其使用的密封性要求也较高; 1. The principle of dry gas seal selection (1) Whether the medium being conveyed is harmful or not, whether slight leakage is allowed or not; (2) The temperature range and pressure level of the medium being conveyed; (3) Whether the use environment is riotous; Environmental riot level requirements are high, such as the surrounding flammable, explosive media or equipment, the use of its sealing requirements are higher;