... Iron 3.Finishing: EPD Coating 4.Deep Carburized Wear Surface Name: Mud Pump Valve BodyFull Open Plate TypeMaterial: ... mud pumps like valve seat,piston,spring,pump plate,retainer etc.2 They are made ... . They are treated by carburizing and hardening.4. EPD Coating is made before packing.5. ... Turning, Boring, Slating, Grinding,, NC/CNC Machining etc.4) Tolerance is controlled by CMM Machine.5) OEM Service6 ...