1、新增7.4,所有阀门都应通过API 641 阀门逸散性型式试验认证。(API 641的形式认证是级别了? 2、1.7明确提出不适用于双向阀座。 3、3.4提出壳体shell的定义 4、新增5.3.11阀门应考虑中腔泄压要求
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