The other posts sum up how it operates. That said, if you ever have an engine with a turbo falling on it's face when put under a load, and it has one of these elements, change the element before you do anything else.
I had a customer with that problem on an air compressor unit. It ran fine at an idle but bogged under a load. Turned out the check ball was leaking air into the fuel system when the unit was loaded and the turbo started building boost pressure. The little bit of air in the system would then cause the engine to bog down like it was beginning to run out of fuel. The second it slowed down, boost pressure dropped, and the engine would attempt to pick back up momentarily, and then the cyclke would repeat.
I just about lost my religion figuring that one out, but it would up being that stupid little element.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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