BS EN 331:2015
Manually operated ball valves and closed bottom taper plug valves for gas installations for buildings
https://doi.org/10.3403/30279703 (published 31/12/2015)
BS EN 331:2015 is maintained by GSE/42. This standard is available from the following sources:
Other historical versions of this standard document also exist:
- BS EN 331:1998 [current until 16/04/2021]
- BS EN 331:1998+A1:2010 [current until 31/12/2015]