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Definition and difference of safety valve and relief valve
Release time:2023/7/21



Safety relief valve (safety relief valve), also known as safety relief valve an automatic pressure relief device driven by medium pressure. According to the use of different occasions can be used as a safety valve or a relief valve.


In Japan, for example, to the safety valve and relief valve to make a clear definition of relatively few, generally used as a boiler such as a large energy storage pressure vessel safety devices called safety valves, installed on the pipeline or other facilities called relief valves. However, according to the provisions of the "thermal power generation Technical standards" of the Japanese Ministry of International Trade and Industry, an important part of the safety guarantee of the equipment is designated to use safety valves, such as boilers, superheaters, reheaters, etc. In the case that the lower side of the pressure reducing valve needs to be connected with the boiler and turbine, it is necessary to install a relief valve or safety valve. In this way, safety valves require more reliability than relief valves.


In addition, from the Japanese Ministry of Labor's high-pressure gas management rules, the Ministry of Transport and the rules of the ship association at all levels, the identification and regulation of safe emissions, we call the safety valve that guarantees emissions, and the valve that does not guarantee emissions is called the release valve. In China, whether fully opened or micro-opened collectively referred to as safety valves

I. Overview
Safety valves are important safety accessories on boilers, pressure vessels and other pressure equipment. Its reliability and performance are directly related to equipment and personal safety, and are closely related to energy saving and environmental protection. And some users and design departments in the selection, always choose the wrong model.
Ii. Definition
The so-called safety valve in a broad sense includes the relief valve, from the management rules, directly installed on the steam boiler or a class of pressure vessels, the necessary condition is that the valve must be recognized by the technical supervision department, in a narrow sense called the safety valve, other generally called the relief valve. The safety valve and the relief valve are very similar in structure and performance, both of which automatically discharge the internal medium when the opening pressure is exceeded to ensure the safety of the production unit. By the existence of this essentially similar, people often confuse the two when they are used, in addition, some production devices also stipulate which can be selected in the rules. As a result, the differences are often overlooked. So there are a lot of problems. If you want to make a more specific definition of the two, you can follow the definition set out in the ASME Boiler and Pressure Vessel Code Title I:


    (l) SafetyValve (safety valve), an automatic pressure relief device driven by the static pressure of the medium in front of the valve. It is characterized by a sudden opening of the full opening action. For use with gas or steam.

    (2) Relief valve (ReliefValve), also known as relief valve an automatic pressure relief device driven by the static pressure of the medium in front of the valve. It opens proportionally as the pressure exceeds the opening force. Mainly used in fluid applications.


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