网络优化资料：

There are two types of valve systems:

One of them is the "nominal pressure" system represented by Germany (including China), which can reach 100 degrees at room temperature, while Germany can reach 120 degrees.

One is the "temperature-pressure system" represented by the United States. This system is represented by the allowable operating pressure at a certain temperature of the solenoid valve pulse. All levels use 454 degrees except for the reference temperature of 150Lb and 260 degrees. No. 25 carbon steel valve, 150 pounds (150psi=1MPa), at 260 degrees, the allowable stress is 1MPa, and it is much larger than 1MPa at room temperature, about 2.0MPa.

Therefore, it is generally believed that the nominal pressure rating corresponding to 150Lb of the American standard is 2.0MPa, and the nominal pressure rating corresponding to 300Lb is 5.0MPa and so on. Therefore, the nominal pressure and temperature and pressure levels cannot be converted at will according to the pressure conversion formula.

pn is a numerical code related to pressure, a circular integer that is convenient for reference, pn is a value that approximates the normal temperature withstand pressure MPa, and it is also the nominal pressure commonly used by Chinese valve manufacturers. For carbon steel valve body, the maximum allowable working pressure is below 200℃; for cast iron valve body, the allowable maximum working pressure is below 120℃; for stainless steel body, the maximum allowable working pressure of pulse solenoid valve is 250℃ the following. As the working temperature increases, the pressure resistance of the valve body decreases.

The American standard valve expresses the nominal pressure in pounds, which is the result of calculating the temperature and pressure of a specific metal combination. His calculation standard is ANSIB16.34. The main reason why the nominal pressure of the pound scale cannot be one-to-one corresponds to the difference in the temperature reference of the nominal pressure of the pound scale. Under normal circumstances, we use software to calculate, but we must also know to use tables to check the pound level. The pressure level in Japan is mainly expressed in K value. Regarding gas pressure, in China, we usually use the unit of mass "kilogram" (rather than "thousand catties") and kilograms more often. The corresponding pressure unit is "kg/cm2". Each kilogram of pressure is expressed by one square centimeter, and the force is one kilogram.