NS EN 331:1998被替代
Manually Operated Ball Valves And Closed Bottom Taper Plug Valves For Gas Installations For Buildings
出版：Norwegian Standards (Norges Standardiseringsforbund)
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.
SS EN 331 Ed. 1 (1998) - Identical
UNE EN 331:1998 - Identical
I.S. EN 331:1998 - Identical
NBN EN 331:1998 - Identical
NF EN 331:1998 - Identical
NEN EN 331:2015 - Identical
NF EN 331:2016 - Identical
BS EN 331:2015 - Identical
UNI EN 331:2016 - Identical
SS EN 331:1998 - Identical
EN 331:2015 - Identical
SS EN 331 Ed. 2 (2016) - Identical
ONORM EN 331:2011 - Identical
NBN EN 331:2016 - Identical
SN EN 331:1999 - Identical
NEN EN 331:1998 - Identical
BS EN 331:1998+A1:2010 - Identical
DIN EN 331 (1999-04) - Identical
ONORM EN 331:1998 - Identical
UNI EN 331:2011 - Identical
