... layer casing head, bottom is threaded... ESP wellhead and Christmas tree Working pressure: 2000PSI ~ 15000PSIWorking medium: oil, natural gas ... sealing, simple operationBy the tubing hanger mandrel type, rely on the screw extrusion excitation rubber seal, with hanging load ... hole, the underground safety valve control pipeline crossing holeChristmas tree with dark rod valve, valve sealing structure, with ...