This document specifies the markings and parameters, structure, general requirements, requirements, inspection and testing, inspection rules, marking, packaging, protection and storage and transportation of welded eccentric semi-ball valves (hereinafter referred to as "semi-ball valves") for urban heating. This document is applicable to welded eccentric semi-ball valves with nominal dimensions less than or equal to DN2000, nominal pressure less than or equal to PN25, hot water temperature not greater than 200°C, steam temperature not greater than 350°C, and the medium used is hot water or steam.
T/HNFM 001-2023 history
2023T/HNFM 001-2023 Welded eccentric semi-ball valve for urban heatin