40 air brake valve diagram
Spring Brake Controls for Trucks - Piping Examples ... Modulation requires an alternative source of air pressure which is provided by the SR-1 valve which ... (Air to open spring to close) Single acting air cylinders require what is known as a 3 way valve function. Because Velvac valves are multi-purpose we can also control double acting air cylinders (air to open air to close) if required using the same valve but as a 4 way function. • Solenoid or "Electric Over Air" Valves: The diagram in Figure 1 shows the principal parts of the air brake system. Figure 1: Schematic of air brake system. The air is drawn into a compressor and stored in a main reservoir at 7-10 bar (100-140 lbs/sq.in). Compressed air from the main reservoir is distributed along the train through the main reservoir pipe. Air brake valve diagram