Yong Heng,?? old model or new one..?

You speak of a tag marked 2017 I never noticed a date on mine and I have been using it for nearly 2 years , I have had to change one burst disk and that’s all. But I never fill to 4500psi I set mine to shut off at 4200psi and change oil more than recommend, Anyway where is this tag with the date that was mentioned

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This 'made in china' sticker/tag/name plate is on the side of the YH unit on the left one in my above pic,,,

The unit on the left with the "extra plumbing" has a condensate collector for the low pressure piston. It does help keep an appreciable amount of moisture from going to the high pressure piston. I believe the piston upgrades were at the end/beginning 2018/2019 so the 2017 unit has the old style pistons. I have the manual shut off unit with the low and high pressure moisture purge (extra plumbing). Mine has no issues pumping to 4500 psi. I did install a dedicated 20 amp circuit for it.

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Thanks for explaining that... Do you know if the inlet filter "breather nozzle" where the compressor draws in air,, is it threaded..?

ACS, the picture of the info plate on the unit could be from an old/long running ad. Might be possible that the stock they have is newer.

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Yup, was thinking the same thing...



Not sure if its trure, but was told to get the YH with every option they have available. Seems options were added continuously thru its production run. The units with all the options are the latest out with all the newest updates/tweaks. But he continued to say that doesn't mean a newer production bare bones unit doesn't have the internal piston updates and or other later unit updates, He continued to say the only way to be sure if you're not talking with one of the YH/Clone factories is to get the one with all the options... Could be a sales ploy to sell the most expensive unit,,, idk.

So, if that is true, the units with 1) updated/added water separator , 2) adjustable pressure off, 3) mounted next to power switch is a light and buzzer/siren that alerts when set pressure is reached. 4) water pump 110v plug on unit that comes on with compressor switch

Any other latest and greatest YH options/updates/tweaks available..?

I can only find the fully optioned out YH at aliexpress with $126 shipping, so thats not an option.

I'm going to cascade this YH compressor with my nitrogen tank when tank pressure is below 4200psi allowing me to 'vacuum' nitro tank empty instead of needing a refill at 4000psi. Might go for the bare bones $185 unit and hope I get the updated piston. I actually don't even need the water separator, as being fed with dry nitrogen makes it useless. I will need a high quality inline filter to catch oil mist and any debris from the compressor.

Am I correct in thinking all the lights, extra plumbing, buzzers, auto stop relays/switches, just are more things to go wrong or leak..? Especially if they're not needed in my application..?

Worst case scenario if i get the old piston/internals, and it breaks, I'll have to rebuild it with updated parts, parts seem ridiculously cheap, and I'm pretty handy with those type rebuilds...

I would consider using a Shoebox compressor (booster) if you are going to feed it with nitrogen. The fill times will be quite a bit longer but the Shoebox is damn near bombproof and very easy to maintain. The Yong Heng is not designed to be fed pressurized air but the Shoebox is. Regulating the output from a nitrogen tank down to an acceptable psi for the YH might be problematic.

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Not sure if anyone here would catch that problem,, you did.

But not a problem for me at all. Very familiar with designing and working with compressors and complicated process cooling cascade systems, and hpa systems. For this system the key is not to feed it with high pressure nitrogen, just as you said.

We know it can take atm14.7 so a couple/few psi gauge pressure is a good starting point. Will be using a manifold gauge set with low pressure nitro regulator on my 6000psi tank, and further throttle the intake psi with the gauge manifold to maintain 1-2psi.. Will adjust feed to YH at a few psi max or around 15-16psi absolute pressure, with amp probe on YH to make sure it doesn't over amp. done this many times with all different types of gases/refrigerants...

iirr, might have a very low pressure regulator that will do 1-2psi without using/monitoring a gauge manifold manually making adjusting that could be needed often during the fill as tank pressures decrease/increase. Just got to jog the old memory and remember where I put that low press reg many years ago, if its even still around...How fussy maintaining 1-2psi will be using a gauge manifold set all depends on how the YH handles V E as the tanks fill/empty and psi gets high.

If you're a gambling man, and want to try and shorten fill times (and maybe increase oil blowby, heat and amps) key is to raise the intake pressure slowly watching amp draw/heat/sound. All at my own risk of YH destruction, with rebuild parts in stock,lol. Never know, YH might be a good candidate for a pressure feed and fast fill times. Some compressors actually like a low pressure feed as it lessens the load by compressor not having to draw/suck in gas. 

Or just keep it at 1-2 psi max and enjoy being able to empty my 6000psi nitro tank completely. While also enjoying clean, dry, temp stable, inert gas, industrial nitrogen. About time I start doing this. Although we probably only go thru a couple tanks a year at my shop with multiple people using it for leak detection and nitrogen purge brazing, and with me using it at least once a month for pcp tank filling. A large heavy 6000psi nitro tank last a long time the way I've been using it. Now it will really last a long long time being able to suck it dry and still get a good pcp tank fill...

Any threads on here where this was already done..?

Time will tell how this works out for me...

jmo