Air Brake Compressor Unloader Valve

Air then flows up through the small hole in the lower.

Air brake compressor unloader valve.

If a spring brake is leaking from the the. When the unloader piston is unseated an detroit diesel s60 figure 6 ba 921 compressor unloader system compressor. Figure 7 40 typical two cylinder reciprocal air compressor. When the air pressure becomes greater than that of the.

Valve and out the upper connection to the unloader assembly located in the compressor cylinder head. Check engine or compressor air cleaner replace as necessary. System air to the compressor unloader port. 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.

Some guys use cheap parts and. 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. The air compressor unloader valve vents trapped air. Inspect the parts for damage and correct operation.

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. 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. Unloader valves sticking faulty or mis adjusted air governor. 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.