This standard specifies the model number, type, size, technical requirements, marking, packaging, storage and transportation of vacuum magnetic hydrodynamic seals. This standard is applicable to the dynamic seal of vacuum equipment with an external pressure of 1×10Pa (atmospheric pressure) and a vacuum chamber pressure of 1×10Pa~1×10Pa (atmospheric pressure).
GB/T 1800.2 Geometrical product specifications (GPS)—ISO code system for tolerances on linear sizes—Part 2: Tables of standard tolerance classes and limit deviations for holes and shafts*， 2020-04-28 Update
GB/T 19923 Urban wastewater recycling and industrial water quality*， 2024-03-15 Update