Pilot operated relief valve of the main valve usually use working medium pressure load, the load size is not restricted, and thus can be used in the occasion of high pressure and large diameter. At the same time, because of the main valve can be designed to rely on the working medium pressure seal form, or you can on the disc is much bigger than direct load safety Industrial Valves of the load, and the main valve sealing easily guaranteed. In addition, this kind of safety valve action is less affected by the change of back pressure, but the reliability of the pilot operated relief valve related to both the main valve and pilot valve, and structure is complex, the valve in order to improve the reliability, specification often require the use of multiple pilot control line. AD - such as Germany A2 norms, rules and regulations of TRD421, when the main valve opened for loading principle, at least three independent pilot control line has to be used to control a main valve; When the main Industrial Valves for unloading, with two independent pilot control line. Thus increased the complexity of the whole protection system. Due to the above reasons, safety valve and pilot operated relief valve spring directly load both in process industry and has a wide application in the electric power industry, and obtained the very big development, together constitute the mainstream of development of safety valve structure. Relief Industrial Valves the main terms and definitions of the relief valve is a high-end valves in the valve product type, because of its complex structure, the theoretical calculation formula is multifarious, various strict performance test, compared with the common valve, there are some strange nouns and terms for a beginner to understand some of the major terms and definitions are needed.

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