dd15 air compressor safety valve in stock

Why do you think it is the unloader valve? Was the system purging like it is now prior. replacing the dryer cartridge? Something to consider, just because you replaced the dryer cartridge, does not fix the purge valve or heater element.

Working on the air compressor on a DD15 can be difficult, it is mounted at the rear of the engine on the drivers side, off of the accesory drive. It has the power steering pump mounted to the end of the compressor.

When getting into the compressor and other items running off the acessory drive, you really need to put things back together with new O-rings, seals, gaskets bolts and crush washers.

If the tank is over pressurized, the pressure switch isn"t shutting off the motor when the air tank fills to the cut-out pressure. Move the pressure switch lever to the off position. If the compressor continues to run, replace the pressure switch, because the switch isn"t shutting off the compressor motor.

If the compressor shuts off when you move the pressure switch lever to the off position, pull the safety valve ring and release all air from the tank. Switch the pressure switch lever to the on position and allow the tank to fill. If the compressor doesn"t shut off when the air tank fills to the cut-out pressure, replace the pressure switch, because the switch isn"t shutting off the compressor motor when tank pressure reaches the cut-out pressure.

Brand new, certified 1/8" Male NPT Threaded 70 PSI air compressor / tank pressure safety relief valve. Also known as a "Pop Off" or "Blow Off" valve. This relief valve is manufactured in the United States and is stamped with "UV" & "NB" symbols. The relief pressure of this valve is set at 70 PSI and is accurate within + or - 3% of the set pressure.