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5.What is double block&bleed(DBB) design ?

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5.What is double block&bleed(DBB) design ?
Update Time:2012-08-20
                     

     When ball is full open or close position,the transmitter substance in center cavity of body can be released by drainage and emptying devices.In addition,the over loaded pressure in the center cavity of valve canbe released to low pressure end by self relief seat.