Nominal pressure: (Nominal pressure), indicating the symbol PN, the maximum allowable working pressure when applied at a certain temperature. For control valves with carbon steel body, it refers to the maximum allowable working pressure when applied below 200°C; for cast iron valve bodies, it refers to the maximum allowable working pressure when applied below 120°C; for control valves with stainless steel body, it refers to below 250°C Maximum allowable working pressure when applied. When the working temperature increases, the pressure resistance of the valve body will decrease. For example, a carbon steel control valve with a nominal pressure of 6.4MPa (PN64) has a withstand pressure of 5.2MPa when used at 300°C, 4.1MPa when used at 400°C, and 2.9MPa when used at 450°C. . Therefore, the determination of the nominal pressure of the control valve should be based not only on the maximum working pressure, but also on the maximum working temperature and material characteristics, not only if the nominal pressure is greater than the working pressure.

 

 

 

 

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