Control switching system for inflating and deflating seal on door of bus has first air line connected to seal via control valves and second air line connected to injector

摘要

The compressed air source (110) holds air at a pressure of 8 bar. The first branch of the air line (112) incorporates a first control valve (122) and a pressure reducing valve (120). The pressure is reduced to 0.4 bar. A pressure switch (124) and an emergency switch-off system (136) are connected to the inflatable seal (114). The second branch of the air line (116) incorporates a second control valve (128) connected to an injector (118). A third air line (130) connects the first line to the injector via a pressure switch and a third control valve (132).