... 2.Material: Alloy Steel, Ductile Iron 3.Finishing: EPD Coating 4.Deep Carburized Wear Surface Name: Mud Pump Valve BodyFull Open Plate ... for mud pumps like valve seat,piston,spring,pump plate,retainer etc.2 They are made of alloy steel without any welding ... Ductile Iron, Grey Iron, Copper, Aluminum Bronze, Malleable Iron etc.2) Process: Investment Casting, Sand Casting (Resin Sand Casting, Green Sand ...