... .104) Flanged end: BS4504, DIN 2532, JIS B2212, ANSI B16.10/ANSI B16.50Specification: 1.Drivign manner: Spur gear transmission,Bevel ... ,Welding,Bear and insert welding.3.Design feature: Single-disc,Double-disc.4.Sealing formation:Hard alloy,Alloy steel.Feature:1.Both ... are nitrogenized so that it is erosion and abrasion resistant.4.There is no backward sealing structure in the valve, so ...