Watching some videos on the yong Heng compressor and they said you should bleed it before you shut it off. What happens if I shut it off first without bleeding it? They claim it will back pressure into the piston. Is that true?
Should I bleed compressor before shutting it off?
- Thread starter Airmanator
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You can keep doing it? but it puts a lot of stress on the crank"please don't start with pursuer in it" that's why I don't like auto shut off.
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You must bleed it off prior to turning on. No need to do the same prior to turning off. When you turn it off, the stress on internal parts can only be reduced, not increased because the motor stops pushing things. I have got an auto shut off version . No sign of any wear out after 1.5 years of use.
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Just an FYI on this I have noticed I blow way more burst discs if I let the thing turn off by itself than when I release the purge valves first. I have not doubled my discs as some do because I prefer the safety feature to be in werqing order I also seldom fill past 4250psi for the same reason.
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can anyone show us, where the mfr, say to bleed prior to shut off.. I think it is just a case of misunderstanding spread by social media 
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I do "unload" my AV before shutting it down. The owners manual probably doesn't say to do it but I try to do everything I can to extend or prevent a failure. I'd rather do a controlled unload slowly, turn the compressor off, leave the cooling pump running and then shut it off after the temp drops. I work in the oil and gas business and we have some large very expensive gas compressors and one of the hardest things you can do to them is just turn the switch off. It's protocol in the shut down procedure to unload them first. May not be comparing apples to apples but maybe we are. The owners manual tells you to change the oil after approximately 25 hrs I think but almost everyone does it a whole lot sooner, myself included. We're just trying to do a little extra in hopes that it'll pay off down the road. To each there own though.
Jimmy
Jimmy
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can anyone show us, where the mfr, say to bleed prior to shut off.. I think it is just a case of misunderstanding spread by social media
I have read my manual cover to cover and nowhere does it say it needs to be bled at shut down but when I go to the sellers on Ebay and read down the page they all recommend bleed off before shut off. I choose to bleed off on shut down because that seems safer as well as removes the moisture. I actually feel moisture when bleeding off at shut down and don't care to have moisture in the unit. That being said if the manufacturer sells units that automatically shut down and it does not bleed itself off one would assume it is ok to shut down without first bleeding off. JMO, if you have a manual shut off model it just seems that bleeding off fully pressurized will push more moisture out than before start up at a later time. And since the valves have to be opened for startup why not do it on shut down and get the most moisture possible removed.
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Think about it this way … when the automatic shutdown occurs between 4200 and 4500 psi, it holds the pressure in the lines, the compressor and the tank. You close off the valve on your bottle or tank, then you crack open the bleed valve. When you do that, all 4500 psi is being pushed out the bleed valve until all pressure is released. Many a time I have been sprayed when cracking open the bleed valve. I leave the fan and water pump running until cool down is finished but while doing that I'll turn the compressor back on with a dead man in the line, put my finger over the bleed valve and get a little more out of the system. If it sits for more than a few days between fill ups, I'll turn it on and let it run about 5 or 10 minutes with the bleed valve open just trying to keep as much water out of the system as possible. I don't think you'll ever get it all out but in this case, less is more … or better.
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I shut my c/f bottle valve then open the bleeders on the Y/H while the unit is still running bleeding out excess water and cooling the compressor for a couple minutes.
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