This standard specifies the classification and labeling, requirements, test methods, inspection rules, marking and packaging of cast steel flanged stop valves with bellows (hereinafter referred to as stop valves) with flange connection dimension in accordance with those specified in GB/T 569 and GB/T 2501.
This standard is applicable to the design, manufacturing and acceptance of stop valve for the marine vapor, high-temperature oil, high-temperature water, vacuum, refrigerating and refrigeration equipment systems with nominal pressure not larger than PN25 and working temperature not higher than 250℃.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the normative document (including any amendments) applies.
GB/T 569 Marine Pipe Flanges - Connection Dimensions and Mating Face
