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If, on the other hand, the PRV valve is blowing at, say 140 PSI, when your air compressor is normally shutting off on high pressure cut out at 8 bar, then this points to your pressure switch having failed.ħ5 PSI pressure valve popping on cross line? That being the case, my first thought is your PRV valve has failed. its been working fine for the last 3 months i have had it.ĭo I understand correctly that your PRV is opening at 8 bar (120 PSI), this being the normal cut out pressure of your compressor? i have tried adjusting the prv a few turns but the same thing happens at more or less pressure, depending on how much i adjust it. it then continues building pressure until it blows again and so the cycle goes on. it then blows the prv valve until the pressure drops down to about 5 bar. Hi, my 50L 3HP compressor builds up pressure to the recommended 8 bar or beyond. That’s not supposed to happen,and the check valve’s purpose is to prevent exactly that.Įmax 3hp air compressor blowing PRV valve I’m guessing that it’s the unloader valve that’s blipping air out, and if that is the case, then I suspect your check valve in the line going into the tank from the compressor head isn’t seating fully, and it’s leaking air from the tank out through the unloader valve. Or, are you saying that the PRV (pressure relief valve) is opening and closing during this period. When the motor starts, the unloader valve is supposed to close, allowing pressure to build in the cylinder(s) and compressed air to flow into your tank.Īre you saying that the unloader valve is venting air to atmosphere now and again while the compressor is off? When the compressor motor is off, usually the unloader valve (often part of the pressure switch) is open to atmosphere to allow the pressure over the piston heads to bleed to atmosphere. The air valve to let pressure off heads for start up will pop off every 10 seconds until the compressor starts back up? Air valve on compressors cracking open often? Hey! This site is reader-supported and we earn commissions if you purchase products from retailers after clicking on a link from our site.