DS EN 16129:2013 Pressure Regulators, Automatic Change-Over Devices, Having A Maximum Regulated Pressure Of 4 Bar, With A Maximum Capacity Of 150 Kg/H, Associated Safety Devices And Adaptors For Butane, Propane, And Their Mixtures Specifies the constructional and operational characteristics, the safety requirements, test methods and the marking of regulators and automatic change-over devices having a maximum regulated pressure