Strain Behaviors of Seal Cone in Connection Pipeline for the Ultrahigh Pressure easurement

The performance of seal cone in connection pipeline of ultrahigh pressure measurement has been studied. A simulation model was built up to research the effects of pre-tightening force and high pressure of oil on the strain behaviors of seal cone. The strain displacement of cone was 0.032361 mm,when the thread tightening torque was larger than 20N·m. Then,the cone and connection can be sealed well. When the thread tightening torque was smaller than30N·m,cone was separated from the connection by the high hydraulic pressure and oil would be leaked from the connection. Thus,larger pre-tightening force is required to make sure the excellent seal between cone and connection.The researching on the seal behaviors of cone under ultrahigh pressure measurement would promote the design level of ultrahigh pressure seal.