ISO/DIS 23551-5 http://www.iso.org/ ISO standards and projects ISO - International Organization for Standardization 240 http://www.iso.org/iso/logo_iso.gif http://www.iso.org ISO/DIS 23551-5 ISO/DIS 23551-5 - Safety and control devices for gas burners and gas-burning appliances -- Particular requirements -- Part 5: Manual gas valves This document reached stage 40.20 on 2013-04-04 , TC/SC: ISO/TC 161, ICS: 27.060.20 Standards under development