... , 2,30 technology patents 3,BV&CE AF05B-DN65B 24V gas detector with shut-off valve 1.Featuresl Lightweight, low-cost valve ... and accept in accordance with construction specifications of gas pipeline and requirement of manufacturers. Specifications require to set manual shut-off valve ... the driving mode and voltage of the associated supporting products with valves(such as alarm) match, so as not to ...