RevisionC-Developmentofconceptofcompressorforcommercialvehicle

Port 21- First Delivery Port: - This port provides the compressed air which is stored in the
compressor to the dual brake valve upper portion for rear brakes.
Port 22- Second Delivery Port: - This port provides the compressed air which is stored in
the compressor to the dual brake valve lower portion for front brakes.
Port 23- Third Delivery Port: - This port is connected to the exhaust check valve, the
purpose of this valve is to remove the air from the tank for service purpose or cleaning purpose.
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3.2.4 Dual Brake Valve
Figure 3:4: Dual Brake Valve (component of air braking system)
Dual Brake valve is also called as foot valve it is the valve which is pressed by the driver
of the vehicle to prove signal in case of braking this signal is generated with the compressed air
achieved from the compressor. Pressure is always maintained in this circuit, when the brake
pedal is pressed then there occurs pressure increase which opens the valve inside the foot brake
valve and the delivery port is then connect with the tank supplied the pressure, Dual brake valve
is an advanced technology from single brake valve, single brake valve was initially used in
braking system, the problem with the single brake valve was that, if it fails the whole system
baking system is failed. Later this problem was solved by introduction of one more valve level in
the dual brake valve, New generation dual brake valve has 2 supply and 2 delivery, from the 1st
supply and 1st delivery the rear brakes are governed, and from the 2nd supply and the 2 nd
delivery, the front brakes are governed. The 2 circuits have a time difference which provides more
stability to the vehicle. Port Definition for the dual brake valve.
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