If the unloader valve does work, then it may well be the check valve, which is not seating properly and thus allowing air to bleed back into the feedline from the tank. If it does not, then the cylinder is still pressurized and the motor trips the circuit breaker on re-start because it cannot overcome the internal pressure. It releases the air both in the feed line to the tank, as well as the internal pressure in the cylinder. You can hear the "unloader valve" blow the line at the moment the motor shuts off, if it is working properly. it's a one-way valve, allowing air into the tank, but NOT back out of it. NEW Central Pneumatic 6 Gal Oil-Free Pancake Air Compressor. (At the tank fitting is where the "check valve" is located. View Important Information About OF45150, OF45150A Tank Parts. When the compressor reaches maximum operating pressure, the pressure switch shuts off the electrical feed to the motor AND, at the same time triggers the "unloader" valve, which blows the feed line from the compressor outlet to the tank. The "check valve" can be a problem, but I'm guessing it is the "unloader" or "pressure release" valve (same valve, just called different name) that is located at the pressure switch.
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