Regarding valve standards
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For export projects, it is required that the standard numbers be indicated on the drawings for all ball valves, butterfly valves, and the air filters of type QSL, using the same standard numbers as those used for channel steel and angle steel. I checked the certificates for the valves, and there were no relevant national standards specified. They are ordinary ball valves and butterfly valves of DN25 and PN1.0Mpa used in the gas supply system, along with an air filter of type QSL-25, and a pressure reducing valve of type QTY-25.
It’s hard to tell what medium it’s on or under what conditions the valve is being used There are also many valve standards, including national standards and industry standards. The following standards are provided for reference: GB/T 12238-2008 Elastic-sealed butterfly valves with flanges and butt joints; GB/T 12237-2007 Steel ball valves for use in the petroleum, petrochemical, and related industries; SH/T 3411-1999 Selection, inspection, and acceptance of filters for use in petrochemical pumps
Has anyone **worked on a similar project?**