safety relief Industrial Valves, also known as a driven by medium pressure safety relief valve pressure relief device automatically. According to different occasions used are applicable for a relief valve applies for a relief valve. In Japan, for example, to the relief valve and relief valve to make less clearly defined, can generally used for this kind of large boiler pressure vessel safety device called the relief valve, installed on the pipe or other facilities called the relief valve. If, however, according to Japan's miti 'thermal power technology standard' regulation, an important part of equipment safety, specify the use of safety valve, such as boiler, superheater, reheater, etc. And on the under side of the pressure reducing valve need to connect with the boiler and turbine, all need to install relief valve or valve. So, the relief valve requires more reliability than a relief valve. In addition, from the labor ministry of high pressure gas management rules,'s ministry, and various shipping association rules, the acknowledgment and provisions for security emissions, we call to ensure the emissions of the relief Industrial Valves, and does not guarantee that emissions of valves called a relief Industrial Valves.

at home no matter the qi type or micro overview and type are collectively referred to as a relief valve, safety valve is the boiler, pressure vessel and other pressure equipment on important safety accessories. Its operating reliability and performance is directly related to the equipment and personal safety, and closely related to energy saving and environmental protection. And some users in the selection and design department, always choose the wrong type. Therefore in this paper, the selection of the relief valve. Second, define the so-called broad sense including relief valve, relief valve from the point of view of management rules, directly installed on the steam boiler or a pressure vessel, the necessary condition that must be recognized technical supervision department of the valve, in a narrow sense as relief valve, other generally called the relief valve. Safety valve and relief valve on the structure and performance are similar, both are automatic emissions over the opening pressure within the medium, to ensure the safety of the production plant. By similarities do exist in the essence, people when use, often to the confusion, in addition, some production device on the rules and regulations which all can choose. Therefore, the difference between the two often ignored. Thus appeared many problems. If you want to compare both make a clear definition, can be in accordance with the ASME boiler and pressure vessel code 'in the first article in this paper, the definition to understand: ( l） A relief valve driven by static pressure valve before the medium pressure relief device automatically. Characterized by popping all open action. Used for gas or steam. ( 2) Relief valve, also known as the overflow valve is a kind of static pressure driven by valve before the medium pressure relief device automatically. It increases with the increase of pressure more than open force in proportion to open it. It is mainly used for fluid.

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