American standard valve, American standard gate valves) Class for class said nominal pressure, is for a certain metal calculation result of the combination of temperature and pressure, he according to ANSI B16. 34 standard to calculate. Class with the nominal pressure is not the main reason for one to one correspondence class is different from the temperature of the nominal pressure benchmark we usually use the software to calculate, but also want to know the use form class to check. Japan's main said classes with K values. For the pressure of the gas, we generally more commonly used in the quality unit 'kg' description ( Rather than the 'jin') Kg, units. The corresponding unit is kg/cm2, one kilogram of stress is a kilo of force on a square centimeter. Similarly, corresponding to foreign countries, for the pressure of the gas, commonly used pressure unit is 'psi', the unit is '1 pound/inch2', is 'Pounds per square inch,' called the English Pounds per square inch. But the more commonly used is directly call the quality unit, namely the pounds ( 磅。 ) , actually this LB. Is the previously mentioned pounds of force. Change all the units to metric units can be calculated: 1 psi = 1 lb/inch2 material 0. 068bar，1 bar≈14. 5 psi≈0。 1 mpa, Europe and the United States and other countries use psi as a unit. In Class600 and Class1500 corresponds to European standard and with two different values, 11 mpa ( Corresponding class 600) Is the European system of regulation, it is in the ISO - 7005 1 - The provisions of the 1992 Steel Flanges 'inside; 10MPa（ Corresponding class 600) Is American system regulation, this is in ASME B16. The inside of the five rules. So can't absolutely say class 600 corresponding 11 mpa, or 10 mpa, different system of rules is different. American standard gate valve system mainly has two kinds: one kind is Germany ( Including our country) As a representative to room temperature ( Our country is 100, Germany is 120 degrees) The allowable working pressure for the benchmark system of 'nominal pressure'. One is represented by the United States at a certain temperature under the allowable working pressure of system temperature and pressure, the temperature and pressure in the system, in addition to the 150 lb to 260 degrees as a benchmark, the other is at 454 degrees at all levels as a benchmark. For example, 150 lb. 25 of the carbon steel valves at 260 degrees, allowable stress is 1 mpa, and the allowable stress at room temperature are much larger than 1 mpa, is about 2. 0MPa。 So, the general said American standard 150 lb corresponding nominal pressure rating of 2. 0 mpa, 300 lb corresponding nominal pressure of grade 5. 0 mpa, etc. 类150 300 400 600 800 900 1500 2500磅1 Mpa。 6 - 2. 0 2. 5 - 5. 0 6. 3 to 10. 0 13. 0 to 15. 0 25. 0 42. 0 MPA whether the LB and PN is a concept, or a unit ( 磅= 0。 45公斤) ? What's the relationship between and PSI. But the contrast relationship is how to? Conversion to come out? And temperature, the relationship between material is what? PN is a numerically stress-related code, is to provide the reference in a convenient rounded number, PN is approximate in the number of compression MPa at room temperature, is the nominal pressure Industrial Valves usually use in China. The gate valve control valve, American standard refers to the application under 200 ℃ maximum allowable working pressure; For cast iron valve body, refers to the application under 120 ℃ when the maximum allowable working pressure; Control valve for stainless steel body, refers to the application under 250 ℃ maximum allowable working pressure. When working temperature, the body pressure is reduced.
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