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The Specification of Temperature and Pressure Relieving Valves
Temperature and pressure relief valves are automatic valves which are used in industrial process and power plants, to relieve excess pressure or temperature under abnormal operating conditions. Pressure and temperature relief valves play a vital role in the safe operation of a system, as they provide reliable and effective protection against overpressure and over-temperature events. Furthermore, temperature and pressure relief valves are an essential part of the system operating safety program.
In order to properly design and select the right temperature and pressure relief valve for a particular system, there are several specifications and standards that should be taken into consideration. The first and most important factor is selecting the appropriate valve for the correct designed pressure and temperature. The valve should be designed for the maximum operating pressure and temperature of the system. This is often referred to as the maximum allowable working pressure (MAWP) and the maximum allowable working temperature (MAWT). Each valve must also have a suitable relieving capacity, which depends on the pressure and temperature of the system.
Another important aspect is the set pressure and temperature of the valve. This is the pressure or temperature at which the valve will open, allowing excess pressure or temperature to be relieved. The set pressure should be below the maximum allowable operating pressure, while the set temperature should be below the maximum allowable operating temperature. The operative temperature and pressure setting must also be selected carefully, as a valve that opens too early or too late can lead to system failures.
In addition, it is important to consider the reseating pressure and reseating temperature of the valve. This is the pressure or temperature at which the valve will close after releasing the excessive pressure or temperature. The reseating pressure should be above the maximum allowable operating pressure, while the reseating temperature should be above the maximum allowable operating temperature.
The materials of the valve should also be considered when selecting a temperature and pressure relief valve. The valve should be constructed from a material that is appropriate for the range of pressure and temperature that the valve will be exposed to. This could include materials such as brass, stainless steel, carbon steel and various alloys.
Finally, it is important to consider the certification of the valve. This is an assurance that the valve will function properly in accordance with the safety requirements set forth by various safety codes and standards. This may include UL, CSA, and other local safety codes.
Temperature and pressure relief valves are vital components of many industrial systems, and it is important to carefully select the appropriate valve to ensure that the valve can be relied upon to handle any excess pressure or temperature. When selecting a valve, it is essential to consider the maximum allowable working pressure and temperature, the set pressure and temperature, the reseating pressure and temperature, the materials of construction, and the certification of the valve. By taking into consideration these factors, the right valve can be chosen to provide the required pressure and temperature relief for the system.
