2 cylinder tuxing 4500 psi compressor PRV

[ssgmac]

Has anyone tried to adjust the pressure relief valve (PRV) on the 2 cylinder tuxing 4500 psi compressor? It appears to be adjustable and aliexpress says it's adjustable, but that's as far as they go with the description. It looks like there's another half turn or more to go on it. I'm wondering if I can crank 5000 psi out of it. It seems like 4500 is a strange limit on an adjustable PRV.

I read another thread where somebody replaced their PRV with a higher rated one, but I haven't been able to find it to ask there.

Also, what size are the threads where the PRV is screwed into the filter tower?

 

[6gun]

A pic would help. Threads will need to be measured with calipers and a pitch guage more than likely China changes specs whenever they feel like it. If its like the bov on my 4 cyl tuxing it's adjustable by internal spring tension. Don't go to 5000 of you have these questions please.

 

[AlanMcD]

It seems like 4500 is a strange limit on an adjustable PRV.

4500 psi is not a strange upper limit from a company that also sells a lot of tanks rated for a max of 4500 psi . . .

Having that as the peak level, but allowing it to be set lower for tanks rated to a lower pressure level would be very logical in my book, not strange . . .

 

[ssgmac]

4500 psi is not a strange upper limit from a company that also sells a lot of tanks rated for a max of 4500 psi . . .

Having that as the peak level, but allowing it to be set lower for tanks rated to a lower pressure level would be very logical in my book, not strange . .

A pic would help. Threads will need to be measured with calipers and a pitch guage more than likely China changes specs whenever they feel like it. If its like the bov on my 4 cyl tuxing it's adjustable by internal spring tension. Don't go to 5000 of you have these questions please.

What do you mean? Why else would I be asking these questions? I was hoping we could leave the gate keeping on Reddit.

I really do appreciate that you took the time to reply to my question. Maybe I shouldn't have been so vague. I apologize for that. The questions were intended for people who may have already swapped out their PRV, or otherwise modified their compressor to produce 350 bar.

It turns out I don't need to know that thread size/pitch/count/type/etc. There is a lot of adjustment left to be had in that PRV. ..much more than it appears. I was able to turn mine in another 1½ turns with more to spare.

I pumped it up to 4,800 psi. Bled it down to 0, then to 5,100 psi. It wasn't a problem and there was no noticeable difference in performance throughout the whole range .

 

[ssgmac]

4500 psi is not a strange upper limit from a company that also sells a lot of tanks rated for a max of 4500 psi . . .

Having that as the peak level, but allowing it to be set lower for tanks rated to a lower pressure level would be very logical in my book, not strange . . .

What makes you qualify to write such a book? Do you think they make their own prvs? Do you think they make their own pipe and fittings also? Why does the gauge go up to 6000 psi?

Fyi: I was able to get another turn and a half with more to spare out of my prv and crank my pressure up to 5100 PSI with no problems.

Fyi2: ... and speaking from experience, anything with a pressure rating has to be tested to at least one and a half times it's intended max pressure. We usually do two or three times the intended pressure just for us before we call an inspector to do it at one and a half times.

 

[blackdog899]

What makes you qualify to write such a book? Do you think they make their own prvs? Do you think they make their own pipe and fittings also? Why does the gauge go up to 6000 psi?

Fyi: I was able to get another turn and a half with more to spare out of my prv and crank my pressure up to 5100 PSI with no problems.

Fyi2: ... and speaking from experience, anything with a pressure rating has to be tested to at least one and a half times it's intended max pressure. We usually do two or three times the intended pressure just for us before we call an inspector to do it at one and a half times.

Ssgmac, a couple nights ago I was filling my 9 liter with my Gxcs4i that has the Tuxing twin gold filters . I was letting it go to about 4700 psi but the pressure relief valve opened at just over 4500psi. So I was looking all over Aliexpress and googling to find a higher rated valve. Didn’t find anything so I ordered a 5 and 6k burst disc. Anyway tonight tried with the Tuxing 042 twin which also has the gold twin filters and ran it up to 4900 psi on a 6.8 and the 9 liter with no problem. Then I saw this post.
So I can adjust these ? Pic to concur we’re talking about the same thing. If so, how ?

 

[6gun]

What makes you qualify to write such a book? Do you think they make their own prvs? Do you think they make their own pipe and fittings also? Why does the gauge go up to 6000 psi?

Fyi: I was able to get another turn and a half with more to spare out of my prv and crank my pressure up to 5100 PSI with no problems.

Fyi2: ... and speaking from experience, anything with a pressure rating has to be tested to at least one and a half times it's intended max pressure. We usually do two or three times the intended pressure just for us before we call an inspector to do it at one and a half times.

Just because the guage has the range doesn't mean it's meant to go that far (like a car speedo that goes to 190 but your governor cuts ignition at 105). You have a lot more faith in Chinese materials and engineering standards than I do. I have the same bov on the 4 cylinder, and it came preset for 3000, when I had some semblence of a convo with tuxing people they didn't suggest going past 300 bar when I wanted 310.

Using a guage with a wider measurement range than you need can help lessen the odds of the bourdon tube in the guage being memory sprung as yours did. You seem to be set on this, best of luck and be careful. Chinesium fails more often than not.

 

[ssgmac]

Ssgmac, a couple nights ago I was filling my 9 liter with my Gxcs4i that has the Tuxing twin gold filters . I was letting it go to about 4700 psi but the pressure relief valve opened at just over 4500psi. So I was looking all over Aliexpress and googling to find a higher rated valve. Didn’t find anything so I ordered a 5 and 6k burst disc. Anyway tonight tried with the Tuxing 042 twin which also has the gold twin filters and ran it up to 4900 psi on a 6.8 and the 9 liter with no problem. Then I saw this post.
So I can adjust these ? Pic to concur we’re talking about the same thing. If so, how ?View attachment 550177

Yes sir. Do you see the yellow sticker is on the stainless steel thing that looks kind of like a spark plug at the very bottom of twin filters? I think it was a 7/8 inch deep well socket that fit right over that and just crank it in just about a turn probably will do it . I did mine about one and a half. Just turn the outermost hex nut. The deep one

Edit: the blue arrow in the screenshot is a little confusing. It's righty tighty, like on an oxygen or acetylene regulator or air compressor LOL

 

[ssgmac]

Just because the guage has the range doesn't mean it's meant to go that far (like a car speedo that goes to 190 but your governor cuts ignition at 105). You have a lot more faith in Chinese materials and engineering standards than I do. I have the same bov on the 4 cylinder, and it came preset for 3000, when I had some semblence of a convo with tuxing people they didn't suggest going past 300 bar when I wanted 310.

Using a guage with a wider measurement range than you need can help lessen the odds of the bourdon tube in the guage being memory sprung as yours did. You seem to be set on this, best of luck and be careful. Chinesium fails more often than not.

It's not luck my man. It's experience. What do you do after you top your Tanks off with your 4 cylinder compressor? You bleed it off right? If there is a failure that's all that's going to happen. It's going to bleed off . It's just not going to be where you expect it. haven't you had a hose blowout or anything yet? That's probably what's going to blow if anything blows. Those are the weak links after the prv. If you're expecting catastrophe, you're going to be disappointed. It's not going to explode like the space shuttle. But I do have a little bit of faith. It's in the testing of these compressors. They have to be tested at one and a half times their rated pressure. That's 6,750 PSI which is 1,650 PSI under my new limit. My next task is to start walking down that prv to get it to blow closer to that pressure. I think I'll pump it up to 5100 PSI and hold it there, then just start loosening the prv slowly until it blows, then tighten it a quarter turn and call it good.

 

[blackdog899]

Ssgmac, Thankyou
theres just people that are “overly cautious” ( I had to change my original wording)
another poster is criticizing my use of a Gx compressor to it’s design specs.
ahh well…

 

[ssgmac]

Ssgmac, Thankyou
theres just people that are “overly cautious” ( I had to change my original wording)
another poster is criticizing my use of a Gx compressor to it’s design specs.
ahh well….

Speaking of cautious, I'm not sure if you read one of my replies but my next plan is to top of my compressor back off it 5100 or 5200 PSI then loosen the prv until it blows and then tighten it back up a quarter turn and that will be the new set point for me. You might want to consider something similar just so you're still Within a safe zone. Also you know at this higher pressure you're going to have more wear and tear on all your seals and rings and all that kind of stuff so there's that. Make sure you keep the vent on your oil cap

 

[blackdog899]

Oh yeah , read it all and will follow that plan. I’m looking for about 4900 psi
to hopefully keep the tanks just over 4500 or so after the cool.
Thanks,
Mike

 

[6gun]

It's not luck my man. It's experience. What do you do after you top your Tanks off with your 4 cylinder compressor? You bleed it off right? If there is a failure that's all that's going to happen. It's going to bleed off . It's just not going to be where you expect it. haven't you had a hose blowout or anything yet? That's probably what's going to blow if anything blows. Those are the weak links after the prv. If you're expecting catastrophe, you're going to be disappointed. It's not going to explode like the space shuttle. But I do have a little bit of faith. It's in the testing of these compressors. They have to be tested at one and a half times their rated pressure. That's 6,750 PSI which is 1,650 PSI under my new limit. My next task is to start walking down that prv to get it to blow closer to that pressure. I think I'll pump it up to 5100 PSI and hold it there, then just start loosening the prv slowly until it blows, then tighten it a quarter turn and call it good.

My point was exactly that. Experience..... Like knowing how and where to look to adjust a safety blow off valve.

My point isn't to spoon feed people but have them learn, frankly I'm not too concerned with anybody else's gear, wallet or safety but I try to help Increase the amount of critical mechanical thinking if I can.

 

[Ratzy]

Ssgmac, Thankyou
theres just people that are “overly cautious” ( I had to change my original wording)
another poster is criticizing my use of a Gx compressor to it’s design specs.
ahh well…

I've seen that in several threads. They actually believe PCP tanks and guns can explode rather than just crack and blow air.

 

[ssgmac]

My point was exactly that. Experience..... Like knowing how and where to look to adjust a safety blow off valve.

My point isn't to spoon feed people but have them learn, frankly I'm not too concerned with anybody else's gear, wallet or safety but I try to help Increase the amount of critical mechanical thinking if I can

I've seen that in several threads. They actually believe PCP tanks and guns can explode rather than just crack and blow air.

Of course compressed air can cause vessels to explode. It's very dangerous . That's why it's great for launching pellets.

These 4,500 PSI compressors don't have tanks. The tanks these compressors fill have burst discs in them so they're not blowing up. And the whole reason for increasing the pressure is because these new guns run on higher pressure. I'm not going to fill anything higher than the pressure is rated for. I just need a compressor that can fill that high, and now I have one. It's the same one I had before.

Another thing to consider is that these compressors build up pressure so slowly, through small bore pipe, it isn't going to blow anything up. If anybody's ever had one of those fill tubes with the springs on them blow, that's about as bad as it can get. It's just a pop and a hiss.

 

[Ratzy]

I'm sure you can make a bottle explode but that requires external force. A bottle with compressed gas could cause the material to crack from something like corrosion but to explode requires the whole of the body to fail. That isn't going to happen unless you do something like shoot the bottle or place the bottle in a press. Even if the whole internal structure were corroded the gas would cause the weakest point to fail and the pressure relief would prevent an explosive release.

 

[6gun]

Of course compressed air can cause vessels to explode. It's very dangerous . That's why it's great for launching pellets.

These 4,500 PSI compressors don't have tanks. The tanks these compressors fill have burst discs in them so they're not blowing up. And the whole reason for increasing the pressure is because these new guns run on higher pressure. I'm not going to fill anything higher than the pressure is rated for. I just need a compressor that can fill that high, and now I have one. It's the same one I had before.

Another thing to consider is that these compressors build up pressure so slowly, through small bore pipe, it isn't going to blow anything up. If anybody's ever had one of those fill tubes with the springs on them blow, that's about as bad as it can get. It's just a pop and a hiss.

I'm aware of burst discs. 1 of the pictured has none but you'd kill a compressor to over fill it. It's the air processing that is a pressure vessel too, gauge threads, hardline piping and flares if so equipped and auto stops that are bad news ime. Don't get me started on how dangerous the qc was on the 3 yonghengs I went thru. Everything from pistons, rods, reeds, electrical and even a cylinder pulled its cap screws out of the cases during operation. My point is more about asking max performance from chinesium.

I'm not saying don't buy them, I'm saying they're only engineered to be safe enough to keep people buying them and do not have the 2x or 5/3 ability that some of the good import bottles do and ive seen how much harder they work 3000-4500 let alone 5k.

I know there's a reason you want the higher psi, and if it's a gun that can handle that fill it may be worth exploring (to me) but if it's just air storage, the extra pressure and wear on the machine isn't worth the stored air imho. I used to sweat keeping all my bottles at max fill, but leaving them a little shy has helped me with direct sunlight heating my stuff up in the field and getting free psi so I just collected a lot more bottles thru trading labor or just taking them off people's hands for free.

I'm going to re plumb my big tuxing eventually because the tubing work is sooo shoddy. I'm just waiting for 2 particular flares to leak or a reed to break.

 

[6gun]

Of course compressed air can cause vessels to explode. It's very dangerous . That's why it's great for launching pellets.

These 4,500 PSI compressors don't have tanks. The tanks these compressors fill have burst discs in them so they're not blowing up. And the whole reason for increasing the pressure is because these new guns run on higher pressure. I'm not going to fill anything higher than the pressure is rated for. I just need a compressor that can fill that high, and now I have one. It's the same one I had before.

Another thing to consider is that these compressors build up pressure so slowly, through small bore pipe, it isn't going to blow anything up. If anybody's ever had one of those fill tubes with the springs on them blow, that's about as bad as it can get. It's just a pop and a hiss.

The scariest but safest failure I've had was a Chinese brass foster clone letting loose under pressure. One cc of 250 bar air was equivalent to a 22 pistol with no ears

The bov letting pressure out isn't a big deal, rapid failures get sketchy. Burst discs are a little sketchy. Pipe threads and hoses letting loose get interesting.

 

[ssgmac]

I'm sure you can make a bottle explode but that requires external force. A bottle with compressed gas could cause the material to crack from something like corrosion but to explode requires the whole of the body to fail. That isn't going to happen unless you do something like shoot the bottle or place the bottle in a press. Even if the whole internal structure were corroded the gas would cause the weakest point to fail and the pressure relief would prevent an explosive release.

The prv is the weak link when it's not a follow hose or piston ring or stripped out fitting or whatever part of the system might wear out one day. The PRV is more of a high limit switch that won't let us go any higher.

Any bottle that could explode isn't part of the compressor. If someone wants to make bottles explode with their compressor, it doesn't have to be a SCBA tank, and it doesn't have to be 5000 PSI. You can get an impressive explosion of a 100 psi compressor and a water bottle or Gatorade bottle and Schrader valve and some rocks. Or just a gatorade bottle, some water and some dry ice.

I posted this hack for those who got a 350 bar airgun but can't find an affordable compressor or doesn't want to buy a new one because the 4500 psi one is still working strong. If anyone reads this and decides they want to over fill an expired SCBA tank past 4500 psi. I say, go for it. And I hope their next of kin post the video on YouTube so I can get that little bit of satisfaction as I watch them leave the gene pool, knowing I did my part to help eradicate stupidity from future Generations.

But seriously, if the tank is going to blow before the burst disc, it's going to happen before 5,000 PSI

 

[ssgmac]

I'm aware of burst discs. 1 of the pictured has none but you'd kill a compressor to over fill it. It's the air processing that is a pressure vessel too, gauge threads, hardline piping and flares if so equipped and auto stops that are bad news ime. Don't get me started on how dangerous the qc was on the 3 yonghengs I went thru. Everything from pistons, rods, reeds, electrical and even a cylinder pulled its cap screws out of the cases during operation. My point is more about asking max performance from chinesium.

I'm not saying don't buy them, I'm saying they're only engineered to be safe enough to keep people buying them and do not have the 2x or 5/3 ability that some of the good import bottles do and ive seen how much harder they work 3000-4500 let alone 5k.

I know there's a reason you want the higher psi, and if it's a gun that can handle that fill it may be worth exploring (to me) but if it's just air storage, the extra pressure and wear on the machine isn't worth the stored air imho. I used to sweat keeping all my bottles at max fill, but leaving them a little shy has helped me with direct sunlight heating my stuff up in the field and getting free psi so I just collected a lot more bottles thru trading labor or just taking them off people's hands for free.

I'm going to re plumb my big tuxing eventually because the tubing work is sooo shoddy. I'm just waiting for 2 particular flares to leak or a reed to break.

View attachment 551203

That's an impressive collection of bottles you got there. I thought I was bad. I've probably got more scuba tanks than Jacques Cousteau. Then I've got two 30 minute SCBA tanks and two 45 minute SCBA tanks.

I think you're overlooking something about the possibility of catastrophe with these compressors. Have you ever seen the movie 300? Do you know why the Spartins were successful? Because they choked off the opposing forces so that the opposing forces couldn't couldn't get all their Force to the fight at the same time, which is what has to be done with a force of volume to be successful as a force. That's the same thing that's going to happen with any failure in these compressors. that little bore piping is not going to let that much force come through to cause any explosions where any failures might occur. And if you had a check valve between the fill hose and the tank you're filling, there's no way that stored energy is going to be able to hurt anybody unless they really got it coming. And the Machine is not going to do it. You know how slowly they fill. The piston is the size of a thimble.

I thought about changing out all my piping for some brake line and coil it up real good also put some of that brake line guard on it that's like a spring. That should help dissipate Heat real well. By the time I figured out what fittings I needed, I was done with the idea for a while.

Btw, yes. I adjusted my compressor to fill my new HUBEN GK1 V3. It arrived from Kraz Cool AG LLC this afternoon. And it arrived completely full. I wonder if UPS knew what they were putting in their airplane.

This is that brake line protector stuff I was talking about that would actually work pretty good as a heat sink. It comes in ³/16", ¼" and ⅜"ø