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1.What is anti-fire safe design ?

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1.What is anti-fire safe design ?
Update Time:2012-08-20
                                  

     When the trunnion  ball  valve be used normally,its sealed by seat and ball surface,seat retainer  sealed  by O-ring and body,this is soft sealed  and  reliable  sealing . When the seat and O-ring are burnt,the seat retainer and body will be sealed by expanded graphite.Thus act anti-fire safepurpose .