RevisionC-Developmentofconceptofcompressorforcommercialvehicle

Figure 3:1: Air Dryer (component of air braking system)
3.2.2 Multi Circuit Protection valve
Multi Circuit Protection Valve is the second in basic circuit of an air braking system. Basic
function of a multi circuit protection valve is to protect the compressed air from the compressor
to surge and to restrict pressure to bleed out from each of the outlet ports to backflow. Multi circuit
protection valve also restricts backflow.
Below is the port description for multi circuit protection valve.
Port 21- Primary outlet Port, this port is connected to the inlet of the primary air tank, and
this port transports the compressor air from the air compressor to it via filtration process from the
air dryer.
Port 22- secondary outlet Port, this port is connected to the inlet of the secondary air
tank, and this port transports the compressor air from the air compressor to it via filtration process
from the air dryer.
Port 23- Tertiary outlet Port, this port is connected to the inlet of the tertiary air tank, and
this port transports the compressor air from the air compressor to it via filtration process from the
air dryer.
Port 24- Quaternary outlet Port, this port is connected to the inlet of the Hand control
valve, and this port transports the compressor air from the air compressor to it via filtration
process from the air dryer.
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