Accidents of secondary fire explosion caused by improper command or fire suppression technology often occurred during the suppression of chemical fires.
在扑救化工火灾中，因指挥、战术不当等引起二次爆炸伤人的事故。
Fire Safe - Secondary metal-to-metal seal ACTS as backup if primary seal is destroyed by fire.
防火安全-如果第一个密封被火烧坏，则第二个金属对金属密封作为后备密封发挥作用。
The metal-to-metal seat ensures tightness if the secondary elastomer seat is damaged during the fire.
如果第二重合成橡胶阀座在火灾期间被损坏，则金属-金属阀座还可以保证气密性。
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