Valves, as components of special equipment, are playing an increasingly important role with the vigorous development of power, petroleum, chemical, metallurgy, shipbuilding, and nuclear energy. The developed countries in the world have paid considerable attention to the safety and quality of their manufacture. For various reasons, in February 2003, China started to license the manufacturing of pressure- bearing valves and supervise and inspect the manufacturing quality. In the past, due to the poor control of the valve quality, valve leakage or valve body rupture often occurred, causing serious loss of life and property. This article through the application of radiation detection technology in the field of inspection valve body, in order to effectively control the valve manufacturing quality and improve the economic efficiency of enterprises, played a very good role in promoting. Now, the state has promulgated relevant regulations on the manufacturing quality control of valves and formulated corresponding standards. The standard also mentions the problems of non-destructive testing applied in valve inspection. However, due to the diversity in the size and thickness of valves, radiation inspection has a short history in the field of valve inspection. Therefore, the process of detecting flaws in radiographs is still not mature enough, and there is a great deal of randomness, which can easily cause defects to be missed and cause economic problems. Wasted phenomenon. This article discusses in detail the nature of the radiation, the various effects and attenuation laws of the radiation when penetrating the material, and the principle of radiographing, and in-depth analysis of various factors that affect the contrast, unsharpness, and graininess of the film. Starting from the three major factors affecting the sensitivity of flaw detection, the choices of ray source, focal length, transillumination method, film, backscattering, etc. were studied, and the principles for selecting various transillumination methods were stipulated; according to the general formula of minor defects, combined with the national The ratio of transillumination thickness specified in the standard deduces the minimum number of filming times for various transillumination methods. In the paper, the characteristics of ray equipment and equipment were studied. Different detection methods for transillumination were designed. Rays were detected on defective valves according to the traditional transillumination method and the transillumination technology studied in this paper. The resulting defects were negative films. By comparing and contrasting, it is proved that the contrast film can be obtained with transmissivity according to the detection technology of this article, and the defect film with better contrast, unsharpness, and graininess can be obtained, and the transillumination result can be analyzed and summarized, thus providing the valve manufacturer with the assurance of the inspection quality. , And can improve the economic efficiency of radiation detection technology.
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