对于易燃易爆、有毒或有放射的介质，外漏更是不能允许的，因而阀门必须具有可靠的密封性能。
The inflammable, explosive, toxic or radioactive medium is allowed to leak, so the valve must have a reliable sealing performance.
防爆性能：本产品具有本安型最高防爆等级(ia)，可在各种易燃易爆场所(含0区)内完全工作。
Explosion proof performance: This product is intrinsically safe explosion-proof highest level (IA), available in various inflammable and explosive places (including 0 districts) work completely.
爆炸性环境。第29 - 1部分：气体探测器。易燃气体探测器的性能要求。
Explosive atmospheres - Part 29-1: gas detectors - Performance requirements of detectors for flammable gases.
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