NEN EN 331:1998被替代
Manually Operated Ball Valves And Closed Bottom Taper Plug Valves For Gas Installations For Buildings
出版：Nederlands Normalisatie Instituut
专家解读视频
Defines the general requirements for the construction, performance and safety of ball valves and closed bottom taper plug valves. In addition, it details the test procedures and marking requirements. It is applicable to valves for domestic and commercial not directly buried installations inside or outside of buildings, using gases of the first, second and third family.
Supersedes NEN 3098. (01/2003) Supersedes NEN 1647. (03/2004)
ONORM EN 331:1998 - Identical
DIN EN 331 (1999-04) - Identical
BS EN 331:1998+A1:2010 - Identical
SN EN 331:1999 - Identical
NS EN 331:1998 - Identical
SS EN 331:1998 - Identical
DIN EN 331 (2011-08) - Identical
ONORM EN 331:2011 - Identical
SS EN 331 Ed. 1 (1998) - Identical
UNE EN 331:1998 - Identical
NS EN 331 Ed. 1 (1998) - Identical
I.S. EN 331:1998 - Identical
UNI EN 331:1999 - Identical
NBN EN 331:1998 - Identical
NF EN 331:1998 - Identical
NF EN 331:2016 - Identical
SS EN 331 Ed. 2 (2016) - Identical
EN 331:2015 - Identical
BS EN 331:2015 - Identical
UNI EN 331:2016 - Identical
UNI EN 331:2011 - Identical
