I just blew a Yong Heng burst disc. Help me not do it again

"Eaglebeak"

"cootertwo"When the disc blew in my Yong Heng, I just installed 2 of the replacement discs, no more problem.

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I would advise not doubling up the burst disc. It's the same as using a nail to stop an elictrical fuse blowing. It may stop it tripping out but unless you know the cause, you run the risk of having a fire. In this case you risk an explosion. Using two disks will raise the burst pressure to over 10000 PSI, you might as well just use a stopper if you don't want a safety device.

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How are going to get "an explosion"? Don't all tanks have a burst valve on them? If the valve is close on the tank you make burst a line, a connection on the compressor, or damage the compressor in some other way. The volume of air in the compressor and lines is pretty small, once a burst happens it will pretty well be done with expending energy. 

I had problems with my Yong Heng burst disk failing in the 4000 to 4200 range. The burst disk keeper ring on mine cracked and then the darn thing would not hold air at all. I could not find a replacement of that ring. I replace the burst valve with a bolt and o-ring....problem solved. My tanks have 5000 psi burst disk on them. I dont feel like I am in danger of an explosion and yes I have a healthy respect for the energy HPA has at these high pressures. I also baby sit the compressor while it is running.

Between the burst disk in the bottle valve and the electric over load protection I feel safe running 2 burst disk in the pump. I also stay in the immediate area of the running pump, mindful for a change in sound or watching for differences in indicted pressers between tank and pump gauges.

"Eaglebeak"I use a non-return check valve fitting between the tank and filter. when the pressure in the line equals the tank pressure it opens automatically. I don't have to close the tank valve before purging and shutting down. It also has the benefit of not losing a tank full of air if I have an O-ring fail between the pump and the tank which has happened to me before. The fitting is just a male foster to male 1/8NPT with a valve inside. It can be had for $2-$3 on flea bay. Screw it into a male to female 1/8 NPT and you've got a male to male adaptor that can be used in both directions, just make sure you have a bleed valve on the isolated side or you won't be able to uncouple anything.

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Could you provide a link for ebay or other place where I can purchase the correct foster check valve. I did some looking myself on ebay and could not find anything that appeared to be exactly what you described. Thanks Bill

The fitting that I'm using is no longer listed but this one is similar but has a 10x1mm metric thread so it will need to be paired with something compatible.​https://www.ebay.com.au/itm/Paintball-PCP-Fill-Nipple-Stainless-8mm-Air-Tank-One-Way-Foster-M10-M8-Threads/292235740409?ssPageName=STRK%3AMEBIDX%3AIT&var=591151157028&_trksid=p2060353.m2749.l2648
I hope this helps but as you can see it's an Australian eBay site. This one willl fit the chinese filters. I just found the one I'm using on another site. ​https://www.ebay.com.au/itm/Paintball-One-Way-Valve-Foster-Stainless-Steel-HPA-N2-Fill-Nipple-Kit-1-8-/263470105205?hash=item3d580ac275 This one is 1/8NPT.

"Loren"How are going to get "an explosion"? Don't all tanks have a burst valve on them? If the valve is close on the tank you make burst a line, a connection on the compressor, or damage the compressor in some other way.  The volume of air in the compressor and lines is pretty small, once a burst happens it will pretty well be done with expending energy. 

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This is what I envision as the outcome. If they(builder/designer) have the burst disc set to rupture just above the max designed output, they apparently don't think it will sustain much more pressure.

"Eaglebeak"The fitting that I'm using is no longer listed but this one is similar but has a 10x1mm metric thread so it will need to be paired with something compatible.​https://www.ebay.com.au/itm/Paintball-PCP-Fill-Nipple-Stainless-8mm-Air-Tank-One-Way-Foster-M10-M8-Threads/292235740409?ssPageName=STRK%3AMEBIDX%3AIT&var=591151157028&_trksid=p2060353.m2749.l2648
I hope this helps but as you can see it's an Australian eBay site. This one willl fit the chinese filters. I just found the one I'm using on another site. ​https://www.ebay.com.au/itm/Paintball-One-Way-Valve-Foster-Stainless-Steel-HPA-N2-Fill-Nipple-Kit-1-8-/263470105205?hash=item3d580ac275 This one is 1/8NPT.

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Thanks Eaglebeak I was able to find similar fosters on US ebay with that wording. I have one more question if you would take the time. Which way is the air flow through this foster fitting allowed. It would appear to me in through the male side of the foster not the threaded side. Thanks again Bill

"BigTinBoat"

"Loren"How are going to get "an explosion"? Don't all tanks have a burst valve on them? If the valve is close on the tank you make burst a line, a connection on the compressor, or damage the compressor in some other way.  The volume of air in the compressor and lines is pretty small, once a burst happens it will pretty well be done with expending energy. 

Click to expand...

This is what I envision as the outcome. If they(builder/designer) have the burst disc set to rupture just above the max designed output, they apparently don't think it will sustain much more pressure.

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Yes, I feel the little compressor is really working hard to get to 4500 PSI. Just like the "little engine that could"

Yes, Bill, That is correct. If you pair it with another male fitting, you just turn it around if you want it to flow the opposite way. Always double check how you configure it before pressurizing.If you get it back to front, you might not be able to bleed the line. If you have a bleed on both sides, you should be fine.

Decided to top off my Great White tank today to test my set-up with the one-way foster fitting. I started off with 3500 psi in the tank and planed to fill to about 4200 psi. The first time I filled I went from 3500 psi to about 4000 psi in about 12 minutes. I added my chilled water to my 5 gal. bucket started the water pump then the compressor. At about 9 minutes I had the burst disc pop off at about 3900 psi. The water temperature was still at about 45 celsius so pump was not over heating but I believe as other have mentioned these Yong Heng burst discs are just not calibrated right for the pressure. I went ahead as others mentioned and just doubled up on the burst disc replacement. I don't think this will be dangerous as I have the set-pressure model and always stay in the area to monitor the compressor and the other pressure gauges. Bill

Eaglebeak has a good solution. I also use a check valve foster fitting. It came on my Stikman fill station. Once compressor pressure equals tank pressure, air flow automatically begins. Once compressor outlet pressure drops below tank pressure, the check valve prevents any backflow.

Lookiknow it’s an old post but if I could give some advise. Hell with the burst disk mine went on my new Yong Heng at 4200 nope not me. So I unscrewed the nut, put in a din valve an took a little super glue on the opening of the burst disk bolt put on a bb, yes a bb, put it in after it dried enough to hold it there then tighten it down after I put the nylon din valve in there. 100% pressure to hell with that burst disk, I would rather watch it anyway. Also this makes my Yong Heng Auto Stop 3000 psi compressor into a true 4500 psi compressor but keep the water cold and watch it turn it off, when you should, done

Lookiknow it’s an old post but if I could give some advise. Hell with the burst disk mine went on my new Yong Heng at 4200 nope not me. So I unscrewed the nut, put in a din valve an took a little super glue on the opening of the burst disk bolt put on a bb, yes a bb, put it in after it dried enough to hold it there then tighten it down after I put the nylon din valve in there. 100% pressure to hell with that burst disk, I would rather watch it anyway. Also this makes my Yong Heng Auto Stop 3000 psi compressor into a true 4500 psi compressor but keep the water cold and watch it turn it off, when you should, done

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The burst disc has nothing to do with the auto-stop mechanism. It's just a safety fuse in case all else fails. If you have an auto-stop version of the YH, it will stop when your gauge reaches 300 bar. If you look carefully, you will see a small dot on the face of the dial that lines up with the 300 bar mark. That is the sensor that trips the off switch. If you want to disable that sensor so that you can fill to a higher pressure. just disconnect the wire that runs from the gauge to the loom. The information about the auto-stop model cutting out at 3000 psi (210 BAR) is bogus. 

Yes sorry my mistake in misspelled I meant to say 300 bar which i use 3 liter tanks to give me a little more than 11 fills on my 230 cc which is enough for me. So Eaglebeak what if I was to just put on another Yong Heng gauge from a hard set? Would I have to just do away with that wire? Obviously that set point on the auto shutoff version grounds the unit off when the gauge needle makes contact? 

I'm not sure I understand what you mean. If you have an auto-shutoff model you only need to unplug the wire from the gauge, at the loom, to disable the auto-stop function. It won't affect the operation of the gauge. You don't need to swap gauges. If you don't mind it cutting out at 300 Bar, then forget about all I've said and just use it as is.

Some Burst disc seem to weaken. I've had them blow out of the blue. Things that shouldn't happen, do. I keep 3 extra for my AV. Make sure you get properly rated discs!

They do become weak as they age, had one blow and was only at 4000psi but had been in the compressor for a long time, The first one of my spares blew also shortly after installation. The third one is still in the compressor and working fine, but ordered a bunch of spares through Amazon. Now I don't push my compressor past 4200, not that it won't do more, I just prefer to baby it a little and prefer to not change weakening burst discs.

It's true burst disc getting older My firs burs disc fail yesterday after 1 and half year of use yong heng compressor. I had only 140bar on kalibrgun manometer on burst disc suddenly gone... I have changed for new only one piece I will see...