Safety valve in a broad sense, including the relief valve, from the management rules, directly installed in a steam boiler or a class of pressure vessels, the necessary conditions must be approved by the technical supervision department of the valve, narrow sense of the safety valve, other Generally known as the relief valve. Safety valve and relief valve in the structure and performance are very similar, both in the opening pressure automatically discharge the internal media, in order to ensure the safety of the production plant. The existence of such an inherent similarity, often when people use the two are often mixed, in addition, some production facilities in the rules also provide for the choice of what can be. Therefore, the differences between the two are often overlooked. Thus there are many problems. If you want to make a clear definition of both, you can follow the "ASME Boiler and Pressure Vessel Code," the first part of the definition set out to understand: (l) safety valve (Valve) Driven automatic pressure relief device. It is characterized by having an open full opening action. For gas or steam occasions. (2) relief valve (Relief Valve), also known as a relief valve by the media before the static pressure drive automatic pressure relief device. It opens proportionally as pressure increases beyond the opening force. Mainly used for fluid applications. (3) Safet relief valve (Safet Relief Valve), also known as safety relief valve A pressure-driven by the media automatic pressure relief device. Depending on the use of the occasion not only for the safety valve is also suitable as a relief valve. In Japan, for example, safety valves and relief valves are clearly defined, and safety devices commonly used for large storage pressure vessels such as boilers are referred to as safety valves and are installed on pipelines or other facilities The relief valve. However, if the Ministry of MITI's "Technical Standard for Thermal Power Generation" is concerned, safety valves, such as boilers, superheaters, reheaters, etc., are to be specified as an important part of the safeguards on equipment. In the lower side of the pressure reducing valve needs to be connected with the boiler and turbine occasions, need to install the relief valve or safety valve. So, safety valve requirements than the relief valve more reliable. In addition, judging from the rules and regulations of high-pressure gas regulations of Japan's Ministry of Labor and Ministry of Transport and shipping associations at all levels, we regard the guarantee of emissions as a safety valve without any guarantee The valve of discharge is called the relief valve. Whether in the country Kai-type or micro-Kai collectively referred to as safety valve.
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