![]() It is defined as the maximum amount of pressure the flange or valve can withstand at increasing temperatures. The ANSI class is used primarily for flanged valves. Body static pressure requirements and pressure rating will be expressed in various ways depending on the manufacturer, standard, and type of valve. The rating refers to the total pressure the body and stem can withstand without leakage. It’s a matter of understanding it in a minute. It doesn’t sound straightforward, but it is not. RATING, ANSI CLASS, or Nominal Pressure (PN) in pressure valves This is why we have created standards and nomenclatures to refer to equipment pressures in the industrial world. The pressure that a valve, pipeline, or pressure equipment can withstand depends on other factors, such as the material of construction and the working temperature. So far, we have been talking about pressure units, but let’s complicate the subject a little more. The equivalence between bar and psi corresponds to 1 bar = 14.5 psi. BAR and PSI equivalence in pressure valves ![]() 1 bar is equivalent to 100,000 Pascals or 100 Kilopascals which is the same. In the industrial world, it is also one of the most used. In my opinion, it is the most famous unit in Europe and Spain. ![]() BARĪlthough in the international system (SI), the unit of pressure is the pascal (newton / square meter). It just helps to avoid confusion to use psig or psia as appropriate to be clear about what we are talking about. Sometimes, we write that as 44.7 psia (pounds per square inch, absolute) to remind us that we are talking about absolute pressure. Then the absolute pressure inside is 30 + 14.7 = 44.7 psi. Suppose the air pressure in the car tire is 30 PSIG. The absolute air pressure at sea level is approximately 14.7 psi. When we measure the tire pressure of a car or bike tire, the pressure gauge reads the difference in pressure between the air inside the tire and the air outside the tire. The “G” reminds us that we are discussing this pressure difference. ![]() It represents a measure of pressure relative to atmospheric pressure as read on the pressure gauge. The acronym PSIG refers to Pound per Square Inch Gauge. ![]()
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