The difference between safety valve and pressure relief valve


pressure relief valve
When the pressure in the pipeline is greater than the set pressure of the pressure relief valve, the oil will flow out from the pressure relief valve, so that the pressure in the control pipeline will not exceed a certain limit value. Needle pressure relief valve adjusts the pressing force by adjusting the length of the spring force in the valve. When the pressure in the pipeline is higher than the set value, the spring is pressed in the opposite direction, so that the sealing thimble opens and the oil leaks out. Play the role of protecting equipment and regulating system pressure.
safety valve
The so-called safety valve includes a pressure relief valve in a broad sense. From the perspective of management rules, it is directly installed on a steam boiler or a class of pressure vessels. The necessary condition is that the valve must be approved by the technical supervision department. Others are generally called relief valves.
The difference between safety valve and pressure relief valve

The safety valve and the pressure relief valve are very similar in structure and performance. Both of them automatically discharge the internal medium when the opening pressure is exceeded to ensure the safety of the production device. Because of this essential similarity, people often confuse the two when using them. In addition, some production equipment also stipulates which one can be selected in the rules. Therefore, the differences between the two are often overlooked. As a result, many problems have arisen.
According to the definition stated in the first part of the “ASME Boiler and Pressure Vessel Code”:
(1) Safety Valve is an automatic pressure relief device driven by the static pressure of the medium in front of the valve. It is characterized by a protruding full opening action. For use with gas or steam.
(2) Relief Valve, also known as overflow valve, is 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 for fluid occasions.

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