PTFE Lined Concentric Butterfly Valve Specification: Model: D71F, D371F Size: 2-48, DN50-DN1200 Pressure: Class150LB, PN6-PN16 Body Materials: Ductile Iron, Carbon Steel, Stainless Steel, Bronze etc. Disc Material: SS304, SS316, Aluminium Bronze Sealing Surface: EPDM, NBR Working Pressure: Low Pressure Design & Manufacture: API609 Face to Face: ASME B16.10 Inspect & Test: API 598 Connection Type: Wafer, Flange, Lugged Operation: Lever, Worm Gear, HS Code: 8481804090 Application: Water, Steam, Oil, Seawater etc. Feature: Replaceable Seat Bi-directional Concentric/ Center Line Design Freely Regulating Flow PTFE Lined, Four-stage load elastic seal and absolutely ensures zero leakage both inside and outside.