Fire safe ? secondary metal - to - metal seal acts as backup if primary seal is destroyed by fire . valves ordered for compliance with api 607 will be provided with graphite packing and gaskets 氯气应用-可提供能够满足氯气协会第6小册子所列的全部标准和规定的阀门，包括通风球的预备，流向箭头，以及为了防止污染而进行的清洗和包装。
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