What is the difference between a safety valve and a pressure relief valve?
In the industrial and construction fields, the correct selection and use of safety valves and pressure relief valves are essential to ensure the safety of equipment and personnel. The following are the main differences between these two valves:
Function and use
Safety valve: Mainly used to protect equipment or pipelines from overpressure damage. When the pressure in the system exceeds the set value, the safety valve will automatically open to release excess pressure and ensure the safe operation of the system.
Pressure relief valve: Mainly used to reduce the system overload pressure by releasing part of the fluid when an overload occurs in the system. It is often used in low-pressure gas systems or hydraulic systems, such as fire water supply systems, to effectively control the pressure in the system and ensure that the system will not be damaged by overload.
Accuracy and reliability
Safety valve: Usually more accurate and reliable than pressure relief valve, because the design and production standards of safety valves are more stringent, and they must be pressure tested before use.
Pressure relief valve: Although it can also effectively relieve pressure, it may not be as accurate and reliable as safety valves.
Structural form
Safety valve: Generally divided into spring-type safety valves, lever-type safety valves and pulse-type safety valves according to the structural form, among which spring-type safety valves are the most commonly used.
Pressure relief valve: There are two main types of structures, namely spring type and lever type. The spring type means that the seal between the valve disc and the valve seat relies on the force of the spring; the lever type relies on the force of the lever and the hammer. In addition, there is a pulse pressure relief valve, which consists of a main pressure relief valve and an auxiliary valve.
Usage scenario
Safety valve: mostly used in high-pressure systems such as gas and steam, such as steam boilers, liquefied petroleum gas equipment, oil wells, etc.
Pressure relief valve: mostly used in low-pressure systems such as liquids, such as fire water supply systems, hydraulic control systems, etc.
