SAFETY VALVE for industrial safety equipment, protective devices, and its role is to prevent the inner pressure of various pressure equipment to allow the pressure more than the value of the occurrence of accidents, emergencies, security equipment, long-running. It is widely used in industrial production sectors, for equipment, system security, reliability plays a very important role. There is increasing recognition, experimental study inherent deficiencies that must be numerical simulation methods to reduce test times and in-depth exploration flow mechanism.On the safety valve open phase dynamic simulation study. We get a lot of the safety valve open phase flow field in a meaningful outcome. Such as pressure, speed, temperature and other parameters distribution. At the same time setting pressure test point and obtains the safety valve opening stage curve.Valve spool sensor, flange composed of sensors and the safety valve VB acquisition software testing VB acquisition system. It provides a platform for this field of data acquisition. Sensor data by comparison with the standard data. That does not affect the safety valve in case of normal opening. The new design has the accurate detection of flange sensor data acquisition capabilities.Safety valve to open the process by theoretical and experimental research, numerical simulation and experimental results are compared curves. We get some new results: 1