12/8/2023 0 Comments Quincy air compressor oil filter![]() The inlet valve is closed, so no ‘fresh’ air can be sucked it. When the compressor runs unloaded, it is still running, but it is not actively pumping air or building any pressure. * The oil-stop-valve is open, because pressure from the screw outlet pushes it open The pressure in the separator vessel is close to working pressure, around 7 – 8 bar in a typical compressed air system. * The check valve after the screw element is open, because the screw element is compressing air and there’s a continues flow of air/oil mixture through the outlet. Sucking air in and outputting an air-oil mixture. * The screw element (air-end) is turning. When the compressors runs loaded, it is actively pumping air, creating pressure and doing it’s job :) 1) The inlet valve is open, so air can be sucked in. ![]() # Let's take a look at the 3 stages of going from 'loaded' to 'unloaded' to 'stopped' in more detail: Compressor runs loaded With older compressors, you need to put them in ‘unload’ mode first, before stopping the compressor. A normal stop procedure for a rotary screw air compressor (without vomiting back the oil!) looks like this: 1) Compressor runs loaded 2) Compressor runs unloaded 3) Compressor Stops New compressors will automatically first switch to ‘unload’ before completely stopping. To explain what happens, let’s first look at how things should normally work. What happens in your screw Air compressor? So why and when does this happen? Two situations There are two situations when this can happen: 1) an emergency stop / wrong stop procedure 2) a mechanical problem To explain each of these two situations, let’s first take a look at what exactly happens inside your screw compressor. And if you’ve every seen it happen, it really looks a bit like the compressor is vomiting oil. It’s when oil flows back out through the inlet filter, at the time that a screw compressor stops. I call this an ‘oil vomiting’ air compressor. I’ve received two similar questions this week, about screw compressors with a very specific problem. ![]()
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