spring safety valve is depend on the elasticity of the spring pressure locking valve or plunger seal. Once the abnormal pressure vessel pressure, high pressure will overcome the relief valve spring pressure, so as to open the lock, formation pressure relief channels to release pressure. According to the opening of the disc height, can be divided into whole range and edged. A41H type is suitable for the working temperature of 300 ℃ or less gas, oil, water and other media equipment and pipeline. A41Y162540 p is suitable for the working temperature for 200 C or less of equipment and pipeline corrosion medium. A47H type is suitable for the temperature of 350 ℃ or less media such as steam, air, water, equipment and pipeline. When pressure exceeds permissible value of equipment and pipeline, the Industrial Valves automatically opens, and then released in full. When the pressure to the specified value, the Industrial Valves automatically shut down, to ensure the safe operation of the equipment and pipelines. Through the analysis of the characteristics of the spring safety valve open action, it is concluded that under the action of external force FW, relief valve from closed to open, from open to close the whole process of the Chinese and foreign, the change rule of additional forces FW when additional force from zero increase gradually, internal pressure PL * S is the sum of spring pre-tightening force, when the Industrial Valves is up and increase the role of the media S area, used to overcome the internal pressure of spring pre-tightening force increases sharply, external additional force decrease rapidly. Therefore, the first characteristic peak A. When the additional force decreases and get to close, due to the effect of medium area suddenly decreases, in order to keep the equilibrium relation between the force, force will rise immediately, namely the second peak B characteristics. The two characteristic peaks A and B are online detection under the condition of the relief valve opening pressure and return the technical basis of pressure.

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