... body for mud pump 2,Valve body material: 20CrNiMo 3, hardness: HRC > 60 4, meet with API 7K spe Valve body for mud pump ... style: open hole style * heat treatment * processed by numerical control machine * acid ... , high-temprature resistant * size 4, 5, 6, 7, 8, 9 *For your attention please: Please wipe and keep it cleaning when ...