American standard valve (American standard valve) to the nominal level of pressure that pounds, pounds level is a metal for a combination of temperature and pressure calculations, he calculated according to ANSI B16.34 standards. The main reason why the pound level and the nominal pressure are not one-to-one correspondence is the difference in the temperature benchmark between the pound level and the nominal pressure. We usually use the software to calculate, but we also know how to use the table to check the pound level. Japan mainly uses K value to express pressure level. For gas pressure, we generally use "kilogram" mass units (rather than "jin") in China, in kilograms. The corresponding unit is "kg / cm2", a kilogram of pressure is one kilogram of force acting on a square centimeter. Similarly, corresponding to foreign countries, for gas pressure, the commonly used pressure unit is "psi", the unit is "1 pound / inch2", which is "Pounds per square inch" and the full English name is Pounds per square inch. But the more common one is to call its mass unit directly, LB, the actual LB. All units replaced by metric units can be calculated: 1 psi = 1 lb / inch2 ≈ 0.068bar, 1 bar ≈ 14.5psi≈0.1MPa, Europe and the United States and other countries are accustomed to using psi as a unit. There are two different values ​​for Class 600 and Class 1500 corresponding to the European standard and the American standard, 11 MPa (corresponding to 600 lb.) is defined in the European system as specified in "ISO 7005-1-1992 Steel Flanges"; 10 MPa (corresponding to 600 lb Level) is defined by the American system, which is defined in ASME B16.5. Therefore, it can not be absolutely said that the equivalent of 600 pounds is 11MPa or 10MPa, the provisions of different systems are different. There are two main types of American standard valve: one is the "nominal pressure" system based on the allowable working pressure at normal temperature (100 degrees in our country and 120 degrees in Germany) represented by Germany (including China). One is the "temperature stress" system represented by the United States, represented by the allowable work pressure at a certain temperature. In the United States temperature stress system, except 150LB, which is based on 260 degrees, all levels are at 454 degrees Benchmark. For example, 150LB. 25 carbon steel valve at 260 degrees, the allowable stress of 1MPa, while at room temperature allowable stress greater than 1MPa, is about 2.0MPa. Therefore, in general, the nominal pressure grade corresponding to American Standard 150LB is 2.0MPa, the nominal pressure grade corresponding to 300LB is 5.0MPa, and so on. class 1500 2500 LB Mpa 1.6-2.0 2.5-5.0 6.3 10.0 13.0 15.0 25.0 42.0 MPA Is this LB a concept or a unit (lb = 0.45KG) with PN and what is the relationship with PSI? But how does this control come from? How to convert it? And temperature, the relationship between the material is what it looks like? PN is a number and pressure-related code, is to provide a convenient reference for a round Integer, PN is similar to the pressure equivalent to normal temperature MPa, is the nominal pressure used in domestic valves. Control valve on the body of the American standard valve, refers to the maximum allowable working pressure below 200 ℃; for cast iron body, refers to the maximum working pressure allowed under the application below 120 ℃; for the control valve of stainless steel body Maximum working pressure allowed at 250 ° C. When the working temperature increases, the body pressure will be reduced.
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