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- 1.What is anti-fire safe design ?[2012/8/20]
- 2.What is anti-static device ?[2012/8/20]
- 3.What is automatic body cavity relief ?[2012/8/20]
- 4.What is Emergency sealing ?[2012/8/20]
- 5.What is double block&bleed(DBB) design ?[2012/8/20]
- 6. How about the underground ball valve feature ?[2012/8/20]
- 7. What is your blow-out proof stem design?[2012/8/20]
- 8.What is oviko top entry ball valve feature ?[2012/8/20]
- 9. What is Oviko V type ball valve feature ?[2012/8/20]
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