1.Certification:API607, ISO9001 2.Grade A2 Manufacturer 3.Durable,Anti-corrosion,long life-span 4.Both control and shut-off Application standard1. Quality system: TS, ISO90012. Design: refer to GB12338,MSS-SP-683. Face to face: refer to GB12221-894. Flange standard: JB/T79.1-94, ANSI5. Test standard: GB/T4213-2008, API598Product introductionHB2416 pneumatic piston 3-eccentric butterfly control( ...