What is the difference between a common safety valve and a pressure relief valve?

What is the difference between a common safety valve and a 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 of the pressure relief valve, so as to control the pressure in the pipeline will not exceed a certain limit value. Needle type pressure relief valve, by adjusting the length of the spring force in the valve, to adjust the compression force, when the pressure in the pipeline is higher than the set value, the spring is reversed, so as to seal the thimble open, oil leakage out, play a role in protecting the equipment, adjusting the system pressure. 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 of the pressure relief valve, so as to control the pressure in the pipeline will not exceed a certain limit value. Needle type pressure relief valve, by adjusting the length of the spring force in the valve, to adjust the compression force, when the pressure in the pipeline is higher than the set value, the spring is reversed, so as to seal the thimble open, oil leakage out, play a role in protecting the equipment, adjusting the system pressure. relief valve The so-called safety valve in a broad sense includes pressure relief valve, from the management rules, directly installed on the steam boiler or a type of pressure vessel, its necessary condition is must be approved by the technical supervision department of the valve, narrowly called safety valve, other generally called relief valve. The difference between a safety valve and a pressure relief valve Safety valves and pressure relief valves are very similar in structure and performance, both are automatically discharged internal media when the opening pressure is exceeded to ensure the safety of the production plant. Because of this essential similarity, people often confuse the two when using them. In addition, some production plants also stipulate in the rules that whichever can be used. As a result, the differences are often overlooked. As a result, many problems have arisen. According to the definition set out in Part 1 of the ASME Boiler and Pressure Vessel Code: (l) Safety valve (Safety valve) is an automatic pressure relief device driven by the static pressure of the valve head. It is characterized by a fully open action with a protrusion. Used in gas or steam applications. (2) Relief valve (Relief valve), 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 occasions.

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