AP1000 nuclear power unit is the Westinghouse electric design of the third generation of pressurized water reactor nuclear power units, is currently China's zhejiang sanmen and shandong haiyang two building. AP1000 nuclear power Industrial Valves number and variety is numerous, which has more than 4000 in the nuclear island. Function is normal, the valve in relation to nuclear power plant's safety and economic operation, so the valve of the hidden fault can be diagnosed in advance, it is very important. Diagnostic test valve is the Industrial Valves factory, through the test of the Industrial Valves actuator current/power ( Electric actuators) Or pressure ( Start executing agency) , torque and thrust of the stem and valve movement parameters such as time, establish the parameters of the valve information; Late in the valve during operation, the user through online testing, compare the factory of the diagnostic test parameters, find the hidden defects of valve, targeted for the valve parts for maintenance and replacement. Traditional checking method is in the machine stop valve or equipment preventive maintenance, the disintegration of the valve for inspection, this way not only a waste of time and the maintenance cost is very high, so the AP1000 nuclear power valve when purchasing is very strict, move the valve when the factory must do diagnostic test. 1 diagnostic system * nuclear power valve valve system mainly include Teledyne, CraneNuclear equipment suppliers, Fisher company, etc. Teledyne valve diagnosis system, for example, it is mainly composed of a portable signal processor and stress sensor and other components. 1. 1 portable signal processor of the portable signal processor has 16 ports, but 16 data at the same time, the data types including valve opening/closing time, the valve stem of thrust and torque, electric current, voltage and power of the actuator, etc. The diagnosis system based on the analysis of the Windows operating platform TTSQuiklookII diagnostic software, provides a convenient man-machine interface. When measured according to the measurement of different needs, choose different sensors to collect information, after TTSQuiklookII analysis and processing, finally get diagnostic data and curve of electric valve. Teledyne equipment of the sampling frequency is 1000 times/s, so that when the measured current or voltage frequency 50 hz, at 0. 02 s an alternating cycle can have 20 sampling points given current or voltage changes. A more adequate sampling points for each cycle analysis of the current or voltage parameter change and contrast. In addition, the valves in the process of opening and closing, the thrust and torque information such as the change is at 0. 01 ~ 0. Within 10 s change, only the change of the sampling frequency is high enough to get more accurate curve. 1. 2 stress sensor stress sensor making factory diagnostic test, the pressure sensor and paste on the valve stem, may continue to use preserved after test done. Stress sensor inner surface decorate a circuit, when the stem force deformation, the strain in the wheatstone bridge resistance change, causes the current and the voltage change of bridge; The change of current and voltage data are converted to electrical signals after processing, form the stem with input signal, the relationship between the thrust and torque can be converted the thrust and torque ( FIG. 1) 。 Figure 1 stress sensor working principle of the electric wedge gate valve factory diagnostic test 2. 1 valve diagnostic test in the test of a total of 8 sets of AP1000 nuclear power valve, is a domestic factory production of DN100, nominal pressure for 15 mpa electric wedge gate valve, test were used in the TeledyneQuiklookII diagnosis system of electric valve. Before diagnostic test for each valve opening and closing action 10 times test, to ensure that the valve opening and closing. Then each valve for 4 times, no-load and load experiment, opening/closing test parameters include stem thrust, stem torque, the valve opening/closing time, the current, resistance and power of the electric actuators, etc. For stem thrust and stem torque, sampling valve run out of the seat when the value, maximum value, the average value and valve opening/closing operation when the value of the consideration when the tripping happens in the control switch.
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