Compressor, Don't Need but thinking !

[Scrambler82]

I ran across this Compressor while searching for something else.

"HPDAVV High Pressure Air Compressor -110v/60Hz - 2.1CFM @ 4500 Psi - Scuba Tank/PCP Rife/Paintball Air Gun Filling Station, 3 HP, Full Frame" !

Looks decent and the Amazon Reviews look good.

Anyone have any comments on this compressor.

Thanks

[bear air]

I bought one of their Yong Heng style compressors earlier this year and it was sent back almost immediately. They did a full refund so that was good.

[triggertreat]

I ran across this Compressor while searching for something else.

"HPDAVV High Pressure Air Compressor -110v/60Hz - 2.1CFM @ 4500 Psi - Scuba Tank/PCP Rife/Paintball Air Gun Filling Station, 3 HP, Full Frame" !

Looks decent and the Amazon Reviews look good.

Anyone have any comments on this compressor.

Thanks

That compressor looks like a knockoff to the Air Venturi 4500 psi compressor I have.  It may have the same or similar motor, but it is missing the coiled line to cool the air before entering the tank/PCP.  Also, I don't see the built-in cooling reservoir.  I have had my AV for three years this month.  It has worked very well for me.  I just filled an 88CF tank today with it from 2500 psi to 4500 psi.  It took 45 minutes.  Normally less than 30 minutes from 3000 to 4500.


There might be a circuit board in that one, but without the cooling system I don't know.  That's all I've got.

[skohl]

I have one. Search HP DAVV on airgun nation

[Scrambler82]

Anyone have an opinion on this compressor.

110V / 60Hz Tank Refill Air Compressor 300bar for Paintball Game Air Gun 2.1cfm
https://www.ebay.com/itm/110V-60Hz-Tank-Refill-Air-Compressor-300bar-for-Paintball-Game-Air-Gun-2-1cfm/184028746496?hash=item2ad8f7d300:g:C5MAAOSw8Ahc66DD

This compressor doesn't have bad reviews, has dual cooling radiators, fans and a Water Tank for Distilled Water.

The Heads, both the Low and high pressure heads, are setup with higher volume to allow water in and around the top of each cylinders.  It looks like it would cool better than others I have seen.

I don't know enough, actually nothing, about high pressure compressors so my questions may seem a little entry level, and that is why !

Thanks

[Scrambler82]

Anyone have an opinion on this compressor.

110V / 60Hz Tank Refill Air Compressor 300bar for Paintball Game Air Gun 2.1cfm
https://www.ebay.com/itm/110V-60Hz-Tank-Refill-Air-Compressor-300bar-for-Paintball-Game-Air-Gun-2-1cfm/184028746496?hash=item2ad8f7d300:g:C5MAAOSw8Ahc66DD

This compressor doesn't have bad reviews, has dual cooling radiators, fans and a Water Tank for Distilled Water.

The Heads, both the Low and high pressure heads, are setup with higher volume to allow water in and around the top of each cylinders.  It looks like it would cool better than others I have seen.

I don't know enough, actually nothing, about high pressure compressors so my questions may seem a little entry level, and that is why !

Thanks

Got a reply from the Manufacturer, quick response.

I found out the Manufacturer is, "HPDMC", don't know what that stands for !

They have a 220 volt unit and it is on its way to the USA, I need to know the other things I asked about !

They didn't state the Hertz or the amperage requirements, I sent a second message to them.

[Scrambler82]

I bought one of their Yong Heng style compressors earlier this year and it was sent back almost immediately. They did a full refund so that was good.

Which one and why did you return it ?

Are there any that we can actually count on ?

Most of the Compressors come from China or have parts from China, any made in the USA ?

[AlanMcD]

I'll share some general thoughts on these compressors, but I want to be clear up front that I do not have any direct experience with these types of compressors - I do have a Shoebox, specifically due to its robustness and fitness for filling tanks, and hopefully that will be all I ever need.

The first thing to consider is the general trade off on cost vs. robustness and reliability. 

All of the "serious" compressors - meaning "real" dive compressors, the only kind we could get before the Shoebox first came along - are all three and even four stage compressors.  There is a very good reason for this - compressing air to 4500 is hard to do: it generates a lot of heat in the air charge and condenses a lot of water out along the way.  Doing it in more steps allows for some of that heat and condensation to be more easily removed in the process, and thus allows the system to work more efficiently and with lower overall energy input per unit of air compressed.  And perhaps most importantly each stage can have a lower individual compression ratio, reducing the work of each stage, reducing the stresses on the parts in that cylinder.  Unfortunately, more stages leads to more parts and more costs - that is why all these "budget" compressors are trying to do the work in two stages, as it allows them to have fewer parts and cost less.  Interestingly, this is precisely the reason Tom Kaye developed the Shoebox the way he did - while the Shoebox itself only has two cylinders, it actually is a three stage compressor as the first stage is done by the shop compressor (also allowing ~90% of the condensation to be handled in that first stage, where it is easiest to handle).  It is an extremely robust three stage compression system, albeit a slow one - but the cost reduction came from "outsourcing" the first stage of compression (BTW, owing a shop compressor is a great thing, as they are incredibly useful in their own right).  It is too bad that nobody is working/making a compressor from this basis any more - a "Yong Heng" type of compressor that was specifically designed to be fed shop air could be much more robust and possibly less expensive (however, I do acknowledge that such a system would not be able to be a truly "portable" compressor).

Since we are looking at lower cost compressors here, that pretty much leaves us looking at all the two cylinder compressors, as they dominate the budget category of compressors.  I do have a few thoughts on those as well. 

There seem to be two general design approaches to these - the first, typical of the "Yong Heng" style, is to build both stages into the same linear axis of compression stroke, and the second is to split them into separate cylinders typically 90 degrees apart.  Both approaches require that the compression ratio in both stages be higher than in a three or four stage compressor, so they are equal on that front, and both allow for air charge cooling between the two stages (how well that is done is a function of the individual compressor design), so they would also be potentially equal there.  But the benefits of spreading the load across two connecting rods and bearings is clearly an advantage for robustness of the design - although at a cost penalty to the crank system, so there is s trade off.  Of course either approach can be executed either well or poorly, but the V would be easier to do well (as a comparison, do note that the Shoebox is more like the stacked approach - in terms of crank and motor loading -  but is very robustly designed relative to the loads of the small cylinders and three stage compression levels, so it can be done well).

So with that in mind, I would be drawn more to the design approach of a compressor shown as it is in a "V" configuration, as opposed to one which has a stacked cylinder approach.  But obviously the details of the designs matter - a more robustly designed and cooled "stacked" compressor would be better than a poorly designed V system.  The V compressor is likely to cost more to make and thus to purchase, but it has clear advantages in the area of robustness and longevity, if well executed.

Just some thoughts from a technical perspective . . . take them as you see fit.

[Hoosier Daddy]

Got a reply from the Manufacturer, quick response.

I found out the Manufacturer is, "HPDMC", don't know what that stands for !

They have a 220 volt unit and it is on its way to the USA, I need to know the other things I asked about !

They didn't state the Hertz or the amperage requirements, I sent a second message to them.

Interesting that it's not 110V...
https://www.davyenergy.com/

More specifically here... https://www.davyenergy.com/?portfolio_entries=high-pressure

Read these reviews... I would run away and look at Genuine Y.H.
SCU50 Reviews on Amazon

[triggertreat]

I have taken a closer look at these Davy compressors since my previous post.  I was impressed with the cooling system (that I couldn't see in the OP picture) verses my AV 4500.  It looks like they have improved on it more...Also the filtering system.  I think this compressor just might be my next compressor once my AV 4500 dies.  On eBay you can get at least a knock off one of these??? close to $600 if you want to forgo the auto shutoff and cooling system and use a bucket of ice water.  Not interested in the bucket trick, but still not too bad on pricing for the premium models of these.  I also like that the Davy site has rebuild parts you can order.

[Scrambler82]

Interesting that it's not 110V...
https://www.davyenergy.com/

More specifically here... https://www.davyenergy.com/?portfolio_entries=high-pressure

Read these reviews... I would run away and look at Genuine Y.H.
SCU50 Reviews on Amazon

The usual ones they ship to the USA are 110 volts, I want a 220 volts.

My Barn is already set up for both 110 and 220 vote, and the area I would put the compressor already has both voltages wired up and the 220 circuit is set up for up to 60 amps.  (Welder)

I always understood that a 220 volt motor will run better, live longer, and use less current than its equivalent 110 Motor.
Just me thinking... but when the pressure start to get to the higher end of the fill, a 220 volt motor would handle the load far better than a 110 volt setup.

Added: 
Just looked at the Lins again.  DAVV Compressor looks like the one I added a picture for and I think from the links it is the same seller, at least I think I added a picture.
Same look overall, looks like the same motor on the outside, but the DAVV had no cooling but the one I added did.

As I said, why can the get a good setup for Tank Compressor ?
I have read AlanMcD's posting, interesting and I agree a "V" design is a better setup.
All of these YH and their spin offs, are the same units, touted differently hoping to the sale and the "HPDMC-"V" Unit I posted about looks like and DAVV has one on their site... here we go again !

Are there any made in the USA ?

Add #2:
The DAVV Site is also called "USA Compressor Inc"... and it is my belief it is a front for selling Chinese Compressors.
The one I posted about, the "HPDMC-"V" Unit, says it ships from the same location as the DAVV Units do.

As I said... "Why can't we get a good dependable compressor Made In The USA and that doesn't cost a small fortune.

[Hoosier Daddy]

"Why can't we get a good dependable compressor Made In The USA and that doesn't cost a small fortune.

Because Americans won't work an entire day for a bag of rice to feed our family.

The Chinese do. No health insurance, no union dues, no social security tax...
(that is a metaphor of course but you get the drift)

[triggertreat]

Interesting that it's not 110V...
https://www.davyenergy.com/

More specifically here... https://www.davyenergy.com/?portfolio_entries=high-pressure

Read these reviews... I would run away and look at Genuine Y.H.
SCU50 Reviews on Amazon

The usual ones they ship to the USA are 110 volts, I want a 220 volts.

My Barn is already set up for both 110 and 220 vote, and the area I would put the compressor already has both voltages wired up and the 220 circuit is set up for up to 60 amps.  (Welder)

I always understood that a 220 volt motor will run better, live longer, and use less current than its equivalent 110 Motor.
Just me thinking... but when the pressure start to get to the higher end of the fill, a 220 volt motor would handle the load far better than a 110 volt setup.

Added: 
Just looked at the Lins again.  DAVV Compressor looks like the one I added a picture for and I think from the links it is the same seller, at least I think I added a picture.
Same look overall, looks like the same motor on the outside, but the DAVV had no cooling but the one I added did.

As I said, why can the get a good setup for Tank Compressor ?
I have read AlanMcD's posting, interesting and I agree a "V" design is a better setup.
All of these YH and their spin offs, are the same units, touted differently hoping to the sale and the "HPDMC-"V" Unit I posted about looks like and DAVV has one on their site... here we go again !

Are there any made in the USA ?

Add #2:
The DAVV Site is also called "USA Compressor Inc"... and it is my belief it is a front for selling Chinese Compressors.
The one I posted about, the "HPDMC-"V" Unit, says it ships from the same location as the DAVV Units do.

As I said... "Why can't we get a good dependable compressor Made In The USA and that doesn't cost a small fortune.

Voltage carries current.  So the more voltage, the more current.

You may want to contact Davy and ask about a 220v model before giving up on them.

[Hoosier Daddy]

Voltage carries current.  So the more voltage, the more current.

You may want to contact Davy and ask about a 220v model before giving up on them.

Ohm's law says if resistance (load) stays the same, the higher the Voltage (double) to lower the Amperage needed (half as much)

[Scrambler82]

Thanks to all for posting.

I will contact DAVV AGAIN, as you said maybe they can help.

Biggest problem I need to overcome is the Hertz, USA = 60, Europe = 50...a lot of companies make a 220/Eur at 50 hertz, but they only make a 110/60 hertz for the USA.

The "HPDMC" Company, China, makes a similar Compressor to the DAVV but with, what appears to be, a better attached cooling system. (Dual Radiators and Fans, Fans and Pump are wired with a switch in the control panel).
It will be a while before I buy a Compressor so I have a while to see about the 220/60 here unit and just MAYBE someone will come out with a better USA Made Compressor.
Reviews for this system are 2 - 2 star

Later

[Scrambler82]

Let me start off by correcting what I posted:

Thanks to all for posting.

I will contact DAVV AGAIN, as you said maybe they can help.

Biggest problem I need to overcome is the Hertz, USA = 60, Europe = 50...a lot of companies make a 220/Eur at 50 hertz, but they only make a 110/60 hertz for the USA.

The "HPDMC" Company, China, makes a similar Compressor to the Air Venturi but with, what appears to be, a better attached cooling system. (Dual Radiators and Fans, Fans and Pump are wired with a switch in the control panel).
It will be a while before I buy a Compressor so I have a while to see about the 220/60 hertz unit and just MAYBE someone will come out with a better USA Made Compressor.

Later

Added

First - Thanks to all for the comments, a lot to think on !  BUTT, I have time !

Does anyone have enough electrical knowledge to state the reasons why I can't run a "European - 220 volt / 50 Hertz" Compressor on "USA - 220 volts / 60 Hertz", other than the plug change needed ?

Right now the DAVV "V" Compressor, with upgraded cooling system, is selling for around $950.00 and free shipping in some areas.
I can almost drive to pick one up so I'm thinking it might be a good reason to buy.
I like everything about the one I posted above, ok maybe not the reviews, and DAVV isn't going to make a 220 volt/50 hertz unit anytime soon, unless I want 30 units, so that is almost out of the question but $1300 or $1400 for the AR4500 is really a stretch in the price range for me... I am still hoping for a good unit below 1K$ !

As I said before I still have time, I have a local dive shop that fills tank with breathable air at $12 from "0" pressure, overnight is best but they can get it done in six hours, so I can get the air I need.


Ltr / gsb

[AlanMcD]

You do not want to run motors at the wrong frequency as the power comes out wrong.  To save typing, this is the most concise simple explanation of doing what you want to do will lead to:  http://www.50hz60hz.com/what-happens-if-50hz-motor-is-driven-at-60hz.html

Basically, you don't want to do it.  Personally, I would go for the US specified motor, and if you really want yo at some point you could swap motors to a properly sized US one.

Technically you could rewind the motor to work as you want, but it would not be worth it . . .

[Scrambler82]

You do not want to run motors at the wrong frequency as the power comes out wrong.  To save typing, this is the most concise simple explanation of doing what you want to do will lead to:  http://www.50hz60hz.com/what-happens-if-50hz-motor-is-driven-at-60hz.html

Basically, you don't want to do it.  Personally, I would go for the US specified motor, and if you really want yo at some point you could swap motors to a properly sized US one.

Technically you could rewind the motor to work as you want, but it would not be worth it . . .

Thanks, that was an interesting read.

I've been in contact with DAVV and Air Venturi, both companies say it will run ok...  "OK" what does that mean.  By reading your attached it is evident that is is not a good idea.
So what that means is running a 50hz/220V Compressor on 60hz/220V is not a god thing and shouldn't be done and I cannot depend on either one of these companies to supply me with a TRUE USA 220V/60 Hz unit.

I could go with AV, but they are really pushing for me to use a European Version.
DAVV, at least said they could built one, but it would be an order of thirty units.
I'm hoping there are others that WANT a USA 220V/60HZ Compressor and would speak up, just maybe Air Venturi might get one.

Only time will tell, maybe Air Venturi will come out with a USA 220V model !