... well drilling Material:forged steel/cast steel API single/ double ram blowout preventerStandard:API 6AApplication:well drillingMaterial:forged steel/ ... gate, hydro-cylinder, cylinder cap, piston, piston rod, lock shaft, sealing parts, ram, etc. Oil well's sealing or ... foreside of ram assembly, makes the drilling tools have automatic centering function.5- The horizontal secondary seal equipment of ...