Air Brake Compressor Unloader Valve

Figure 7 40 typical two cylinder reciprocal air compressor.

Air brake compressor unloader valve.

System air to the compressor unloader port. Unloader valves sticking faulty or mis adjusted air governor. Hromee air compressor replacement components brass 1 2 inch mnpt compressor in tank check valve kit with three different unloader tube fittings 20 scfm 4 pieces 4 6 out of 5 stars 218 14 88 14. Air entering the unloader port acts on the unloader piston causing the figure 4 typical compressor drive flanges piston to move upwards away from its seat on the valve plate assembly.

Figure 7 41 type o 1 governor. Some guys use cheap parts and. Valve and out the upper connection to the unloader assembly located in the compressor cylinder head. With the introduction of spring brakes anti compounding and 121 air brake systems because a valve is leaking air out of its exhaust does not mean the valve is at fault.

The compressor s unloader mechanism and governor along with a synchro valve for the bendix duraflo 596 air compressor control the brake system air pressure between a preset maximum and minimum pressure level by monitoring the pressure in the service or supply reservoir. The air compressor unloader valve vents trapped air. Inspect the parts for damage and correct operation. When the unloader piston is unseated an detroit diesel s60 figure 6 ba 921 compressor unloader system compressor.

What the unloader valve does is that is responds to the compressor pressure switch turning the power off to the motor and allows any air that may be trapped over the piston or pistons on a multi cylinder air compressor to vent to atmosphere removing any load that the trapped air may have. When the unloader valves open the compression of air is stopped. When the air pressure becomes greater than that of the. The air brake compressor still won t build air pressure with the governor removedif your air brake compressor still won t build air pressure after removing the governor the next step is to disassemble the unloader.