Pressure valve American standard gb conversion?

Valve is the industry production, water pump connection, that is commonly used in pipe installation, the valve standards often hear people mention or national standard, American standard that is how to return a responsibility, pressure valve American standard gb how conversion, we usually use the PN, Class, all is a kind of representation method of stress, the difference is that they represent pressure corresponding to the reference temperature is different, the PN system in Europe is refers to the corresponding pressure under 120 ℃, and beautiful mark refers to a Class in 425. 5 ℃ under the corresponding pressure. So in engineering swap can't simply stress conversion, such as CLass300 # solely using pressure conversion should be 2. 1 mpa, but if consider to use temperature, its corresponding pressure is increased, according to the temperature of the material withstand voltage test is equal to 5. 0MPa。 The valve system has two kinds: one 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 & other; Nominal pressure & throughout; System. One is represented by the United States at a certain temperature allowable working pressure as representative's & other; Temperature and pressure system & throughout; America's system of temperature and pressure, in addition to the 150 lb to 260 degrees as a benchmark, the other is at 454 degrees at all levels as a benchmark. Class 150 ( 150psi=1MPa) 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. Therefore, you cannot just according to the pressure transform formula to transform nominal pressure and temperature pressure rating. 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 valve usually use in China. Control valve for carbon steel body, refers to under 200 ℃ application allows working pressure; For cast iron valve body, refers to under 120 ℃ application allows working pressure; Control valve for stainless steel body, refers to allow work pressure when it is applied in under 250 ℃. When working temperature, the body pressure is reduced. Change all the units to metric units can be calculated: 1 psi = 1 lb/inch2 & asymp; 0. 068条,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 valve with lb to represent the nominal pressure, the combination of the class is for a certain kind of metal calculation result 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, in China, we usually more commonly used its quality unit & other; Kg & throughout; Description ( Rather than & other; Jin & throughout; ) Kg, units. Its corresponding pressure unit is & other; kg/cm2” , one kilogram of pressure is a kilo of force on a square centimeter. Similarly, corresponding to foreign countries, for the pressure of the gas, common pressure unit is & other; psi” , the unit is & other; 1磅/ inch2” , & other; Pounds per square inch & throughout; , 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.
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