1,Conentric type or called middle line,
2,Seat Ring:NBR,CR,NR,EPDM,FKM,PTFE,PCTFE,FEP,PFA
3,Body lining:NBR,CR,NR,EPDM,FKM,PTFE,PECTFE,FEP,PFA,
4,Seal with two way function,pressure,flow can be allowed to adjust freely.
5,The use of patented technology to have lined butterfly processing board, plastic and metal fluoride matrix closely with seamless