The use of the valve pressure was marked by the valve nominal pressure PN, the body material and temperature. Such as: PN16 for WCB body material temperature is 38 degrees, the highest working pressure is 1. 6 mpa that belongs to low pressure valve, which is the most common form of conventional pressure valve. In fact this is just our valves, not necessarily to distinguish clearly. As long as customers request of pressure, we out of the drawing is ok for him. flange thickness and thickness of the valve is not standard, according to the requirements of pressure. 6. 4 mpa and 10 mpa flange thickness and body thickness is not the same. Such as: general basic pressure 1 low-pressure Industrial Valves. 6 mpa, according to GB/T139272008 and standard JB/T90921999 casting generally selected 1. 6 mpa, disappointing the pressure when the highest is 1. 6 x1。 5 = 2. 4 mpa, if you line pressure exceeds this not line, there are now many manufacturers in order to save costs, the valve did the thin wall, a conventional gate Industrial Valves pressure 1. 6 mpa are a little difficult. According to the classification of pressure valve: 1. Vacuum valve - Working pressure is lower than the standard atmospheric pressure of the valve. 2. Low pressure valve - Nominal pressure PN is less than 1. 6 mpa. 3. Medium-pressure valves - Nominal pressure PN 2. 5 ~ 6. 4 mpa. 4. High pressure Industrial Valves - Nominal pressure PN10. 0 ~ 80. 0 mpa. 5. Ultrahigh pressure valve - Nominal pressure PN is greater than 100 mpa. PN: nominal pressure and piping system components related reference value compression capacity, for ease of use, take priority of R10 series. Nominal pressure refers to the pipes in the secondary temperature ( 20℃） When the water pressure. If the water temperature at 25 ℃ Should according to the different between 45 ℃ temperature drop coefficient, fixed working pressure. Low and middle is just a general statement, such as the height of the people, fat is no clear distinction of pressure pipe fittings design now is specific to pressure value, don't say this place to install a medium pressure valve. Pressure pipeline according to the pressure is generally this classification, the valve can also press this to distinguish. Of course, you say 2. 0 belongs to medium pressure valve, belongs to low pressure valve also nobody shall be investigated according to the pressure points: 1, the low pressure pipeline engineering pressure < 1. 6MPa； 2, medium pressure pipeline engineering pressure 1. 6 - 6. 4MPa； 3, high pressure pipeline engineering pressure 6. 4 - 10MPa； 4, 10 - ultra-high pressure pipeline engineering stress 20MPa。 This article by all standing valve ( Technology and news) Joint editing and publishing
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