Air Venturi Compressor Won't Build Pressure

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Kopfjaeger

Kopfjaeger

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Dec 4, 2017
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My Air Venturi compressor all of a sudden won't build pressure. It worked fine last weekend, now it won't go past 500psi. I've had it for almost three years with absolutely ZERO problems!! It runs just as smooth as the day I bought it....no noises like something broke...no air leaking anywhere. I checked the burst plate, it has a dimple where it formed to the plug....but no hole. I started tearing the high pressure cylinder apart. The valves are not broken, there is a little bit of what looks like carbon on the larger top one. Will clean them up and reinstall. I checked the 3 high pressure seals on the piston rod, no damage and it fits snug in the cylinder. I pulled the check valve out of the top of the low pressure side. It was fine, no cracks or damage. I haven't got into the low pressure cylinder yet, will check it out tomorrow.

Anyone have any thoughts or experience on this???

TIA,

Rick
 
Sometimes on the high pursuer side.Their should be some sort of a check vale with a spring behind it? if you pull that out and clean it and stretch out the spring a little that might be enough tension to seal it back up? once the spring gets tired it wont hold the vale down to build up pursuer up.That little spring is just to hold it long enough to build pursure in the tank to keep it closed.That vale also keeps the pursuer from bleeding back in to the high side.
 
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I've had my AV 4500 for about a year now. A couple of months after I got it, it was working fine, then I just glanced at the temp gauge, it was at 98 C! I turned off the motor and let the cooling system run till it cooled down. After an hour or so I ran it for 10 minutes, the temp stayed at 62 C, but it would not budge past 1000psi (60 BAR). I tried it again the next day with the same results.

I called Air Venturi and they said to send it in. Luckily I saved the box. When I got it back they said it was the low pressure valve plate, and that they also put new high pressure seals in. Hope this helps. Let us know what the problem is/was when you find it.
 
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I've had my AV 4500 for about a year now. A couple of months after I got it, it was working fine, then I just glanced at the temp gauge, it was at 98 C! I turned off the motor and let the cooling system run till it cooled down. After an hour or so I ran it for 10 minutes, the temp stayed at 62 C, but it would not budge past 1000psi (60 BAR). I tried it again the next day with the same results.

I called Air Venturi and they said to send it in. Luckily I saved the box. When I got it back they said it was the low pressure valve plate, and that they also put new high pressure seals in. Hope this helps. Let us know what the problem is/was when you find it.
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Sounds like you overheated yours. It should never be over 65c. 98c is over 200 degree F. I could cook food on your compressor heads. Always check your temp gauge and pressure gauge. Even with the yong heng, most people failed to check temp and let it over passed it's limit and complain why their compressor is broken.
 
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I seemed to have fixed it!!

I cleaned up the two high pressure valve plates by scraping off any build up and then shined them up with scotch bright pad. Replaced the O-rings for the valve plate assembly in the high pressure head. Put it all back together and filled my 97 cu ft tank from 3300 psi to 4500 psi in about 20 minutes. 

Hopefully it lasts another three years 😉
 
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I seemed to have fixed it!!

I cleaned up the two high pressure valve plates by scraping off any build up and then shined them up with scotch bright pad. Replaced the O-rings for the valve plate assembly in the high pressure head. Put it all back together and filled my 97 cu ft tank from 3300 psi to 4500 psi in about 20 minutes. 

Hopefully it lasts another three years 
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Congrat! This is the second time I hear about dirt on reed valve blades causing pressure build up failure although the other report is for a Yong Heng
 
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I've seen some pics of a catastrophic failure of the high pressure piston rod coming loose on a Yong Heng...the head and the rod look to be the same as the Air Venturi?!?!?
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From the pictures posted by Hatsun and AV owners here, I have come to the understanding that Hatsun is in the Yong Heng family ( parts have the same appearence ) and AV is likely in the Tuxing family. 
 
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Visiting back and forth with Jordan at AV I asked him if the AV and the YH shared parts and he said they did. Although different designs some of the internals are the same. I wish we had a cross reference as what parts are. Even with shipping from China which is free on some things you can get some really good deals on parts.

Jking
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Do the Yong Heng ht- side piston rings match? Lots cheaper than PA which are out of stock- piston appears to be same but hate to guess. Also do you need PA tool for installing them? Do you have a direct email to Jordan as he has been very helpful on other issues with this- otherwise I have to go back & forth with others thru their tech service.
 
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Also,jking, how do you remove the plug in your picture to get to the reed valve? Tried pick but could not budge, so lightly punch out from other side with dowel? Don't want to damage reed valve. Saw the aliexpress pic with plug removed & reed valve is inbetween opening & plug https://www.aliexpress.com/item/32947532623.html?spm=a2g0o.detail.1000014.3.71df419cN34dQc&gps-id=pcDetailBottomMoreOtherSeller&scm=1007.13338.128125.0&scm_id=1007.13338.128125.0&scm-url=1007.13338.128125.0&pvid=a1200502-e469-4929-98fb-2138bc4af106
 
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be4meliz,

You are on the right track….tap or push it through with something flat, a wood dowel would work fine. The valve plate should move with the plug, it is pretty much flat against the plug so not much chance of damaging it.

I have yet to replace the high pressure seals. But I have rebuilt hydraulic cylinders with the same type of material, I soak the seals in oil, it softens them up a bit. You can do it dry, either way just go slow when stretching them out.

There are two styles of pistons….one has three seals and the other has four. I don't recall what is in the Air Venturi, I believe it is three. The top portion of the three seal piston configuration unscrews and makes it a little easier to replace the bottom most seal. PA sells a seal installer, it's just a plastic rod that is tapered to stretch the seal…easy enough to substitute with a Sharpie marker or something similar. Push the new seal over the rounded end to help stretch it out some and then work it on to the piston. After it is place just squeeze it around with your fingers to help shrink it back to size. You will probably have to feed the seals back into the cylinder with a small flat blade screwdriver pushing the lip of the seal inward working around the seal as you reassemble to get it into the cylinder.

Good Luck!!

Rick
 
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be4meliz,

Visiting back and forth with Jordan at AV I asked him if the AV and the YH shared parts and he said they did. Although different designs some of the internals are the same. I wish we had a cross reference as what parts are. Even with shipping from China which is free on some things you can get some really good deals on parts.

Jking
Click to expand...

Do the Yong Heng ht- side piston rings match? Lots cheaper than PA which are out of stock- piston appears to be same but hate to guess. Also do you need PA tool for installing them? Do you have a direct email to Jordan as he has been very helpful on other issues with this- otherwise I have to go back & forth with others thru their tech service.
Click to expand...

be4meliz,

The Yong Heng high pressure seals are a little thicker than the AV un-split seals.

1579655806_15915284135e27a27e917e69.60724820_IMG_5136.jpg


I tried them the other day and I didn't have any luck but I think I damaged them putting the cylinder back on because of the extra thickness especially with the little springy ring under them. During that same session I pulled those seals back off and tried using my original recently replaced hi dollar ($6.95ea) seals but I think you only get one shot at putting fresh seals on and taking them off which usually damages them enough that they won't seal properly if re-used. The next morning I pulled those off and decided to try the YH split rings again since I had several spares. This time I stroked the piston as high as it would go, got some good light and carefully using some small needle nose to hold them closed worked the cylinder back down over each seal. Definitely a tighter fit. These seals actually made better pressure than I think the compressor did new. 0-4000 in 2:19sec. The previous time that I thought was really good was just over 2.5min. So you might give these a try.

jking


 
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Also,jking, how do you remove the plug in your picture to get to the reed valve? Tried pick but could not budge, so lightly punch out from other side with dowel? Don't want to damage reed valve. Saw the aliexpress pic with plug removed & reed valve is inbetween opening & plug https://www.aliexpress.com/item/32947532623.html?spm=a2g0o.detail.1000014.3.71df419cN34dQc&gps-id=pcDetailBottomMoreOtherSeller&scm=1007.13338.128125.0&scm_id=1007.13338.128125.0&scm-url=1007.13338.128125.0&pvid=a1200502-e469-4929-98fb-2138bc4af106
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I used a small set of snap ring pliers that fit in the two holes perfectly. Just a slight twisting motion while pulling upward will pull it right out. The seat and "large" valve as it's called had a lot of build up and also some gouges on the seat that I work out pretty much.

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Jking












 
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JKing and other AV owners, does the AV compressor come with a parts kit for the LP side also, or just the HP side? My Lightning only came with the HP seals, piston rings, check valve springs, along with O rings for the filter tower and desiccant block.



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Warning- I posted this on one of my threads, but just Incase anyone orders o rings as a maintenance stash for future service, the first number given on the o rings is the outside dimension. All metric. I exclusively use oringsandmore.com and the first number they call out is the inside diameter, so if your o ring vendor uses inside dimension also as the first number call out, you must deduct the thickness twice beforehand.

The green o rings are for the filtration tower, and are of Viton.
 
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