
Manually operated ball valves and closed bottom taper plug valves for gas installations for buildings
出版:British Standards Institution

专家解读视频
© British Standards Institution 2013
Amendment notes:
Amendment, July 2011. Amends and replaces BS EN 331:1998
NS EN 331 Ed. 1 (1998) - Identical
UNE EN 331:1998 - Identical
SS EN 331 Ed. 1 (1998) - Identical
UNI EN 331:2011 - Identical
SS EN 331:1998 - Identical
NS EN 331:1998 - Identical
SN EN 331:1999 - Identical
NEN EN 331:1998 - Identical
DIN EN 331 (1999-04) - Identical
ONORM EN 331:1998 - Identical
NF EN 331:1998 - Identical
NBN EN 331:1998 - Identical
UNI EN 331:1999 - Identical
I.S. EN 331:1998 - Identical