... DN50-600mm 2.Pressure:150-2500LB,PN6-25 Stainless Steel Welding Gate Valve 1.Size: NPS2"-24",DN50-600mm 2. ... Test Device, Torque Test System and Fugitive Emission Test system equipment, which can control the production quality effectively Standard compliance:1 ... driving.2.Connecting type: Flange,Interior whorl,Other whorl,Welding,Bear and insert welding.3.Design feature: Single-disc,Double-disc.4 ...