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2.What is anti-static device ?

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2.What is anti-static device ?
Update Time:2012-08-20
                                   

    In order to prevent friction among ball,stem and PTFE that generates static electricity which may light the combustibles and explosives that cause an accident,in this ball valve,static-conduction springis  set  between  the  stem  and  the  ball ,the  stem and the body.Thus static electricity is conducted to ground and system safety is secured.