Sanitary grade atmospheric pressure manhole is a kind of equipment used in food, pharmaceutical and other industries with high requirements for sanitary conditions. It is mainly used on containers (such as storage tanks, reactors, etc.) for personnel to enter and exit for cleaning, inspection or maintenance work. At the same time, the design of this manhole will also take into account the control of pressure to ensure that it is used under normal pressure to ensure safety.       The main features of hygienic atmospheric pressure manholes include:       1. ** Material selection ** : Usually stainless steel materials, such as 304 or 316L stainless steel, these materials have good corrosion resistance and easy to clean characteristics.   2. ** Sealing performance ** : The use of high quality sealing ring to ensure the sealing of the manhole after closing, to prevent leakage and external pollution.   3. ** Surface treatment ** : internal and externa…

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