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The nominal pressure of sanitary stainless steel valves

The nominal pressure of sanitary valve, is a numerically marked code related to the pressure, is for reference only with a convenient rounded number. Nominal pressure with the letter "PN" followed by a digital sign.  The same nominal pressure PN values shown in the same nominal diameter DN all piping accessories have adapted to end connection form the same connection size.
The sanitary valve shell test pressure refers to the sanitary valve body and bonnet joint and into the whole of sanitary valve shell test pressure, unit is the Mpa, the purpose is to test the density of the body and bonnet and include within the body and bonnet joint in pressure ability of the shell. The sanitary valve shell test pressure with PS said.
In Britain, the United States and other countries, despite the current in the related standards on the concept of nominal pressure, but the actual use still use English unit in the Class.Due to the nominal pressure and the temperature of the benchmark level is different, so no strict corresponding relation between the two.
The Japanese standard there is a system of "K" class.Pressure of the pressure level with the concept of English unit level is the same, but the unit of measurement adopts the metric system.
On the sanitary valve seal and seal test pressure is inspection open-close part and the body sealing pair of sealing performance and valve stem and valve cover seal sealing performance test pressure.
The sanitary valve pressure refers to the sanitary valve under the working state of stress, the unit for the Mpa.It with the sanitary valve material related to the temperature of the medium, expressed with p, and on the lower right corner of the p word Angle, Angle of note for the highest temperature of medium income divided by 10 integers.Medium, for example, the maximum temperature of 425 ℃ is expressed in P42 work pressure.
According to the size of the nominal pressure, the valve can be divided into:
1. Vacuum valve: refers to the working pressure is lower than the standard atmospheric pressure.
2. The low pressure valve: refers to the nominal pressure is less than the PN16 valves.
3. Medium pressure valve: refers to the nominal pressure PN25, PN40, PN64.
4. High pressure valve: refers to the nominal pressure of PN100 to PN800.
5. Ultrahigh pressure valve: refers to the nominal pressure is greater than or equal to PN1000.