... Loyd’s, Cryogenic Test Device, Torque Test System and Fugitive Emission Test system equipment, which can control the production quality effectively ... Flange,Interior whorl,Other whorl,Welding,Bear and insert welding.3.Design feature: Single-disc,Double-disc.4.Sealing formation:Hard ... is wearing resistant,erosion proof and long-lived.3.The surface and the adjusting media of the valve shaft are ...