HP Davv Portable High Pressure Air Compressor Paintball Scuba Dual Piston Pump

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The hose for this model is the same as on an Air Venturi and Hatsan Lightning. It is a 10mm parallel thread. There is a white or black delrin hard seal that goes in the hole the hose screws into and sits in the base of the hole. It seals at the bottom of the hose. Dowty seals perform a similar function on the outside of BSP hose connections. It is not necessary to use a Dowty seal if you just use the included delrin washer before attaching the hose to the compressor. Without the delrin washer installed the hose cannot seal properly.
 
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I truly think my china compressor is a piece of cheap azz crap. I hate working with garbage, Ya I will get it going again and I mean multiple agains

Davv 2 cylinder with all the bells and stuff

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sometimes I need to vent!!! china built products are lower in quality of material, design and build Quality. The compressor I got used but pretty new at the time. It did not perform full pressure from the get go, I had to trouble shoot and repair. I have ran it for about 1-1/2 yrs only for filling my guns,,,no tanks. My opinion is ,,,expect failure and be prepared for it,,they do, that is why they include rebuild kits. As you see from my photo, rebuild time again,,the HP piston and rings are a real pain for my old tired fingers to assemble, I am thinking of a ring compressing device to help me,,I will get it fixed!!!

there are some chinese built products I like , such as my calipers from Anytime tool, china built but to our standards https://www.ebay.com/str/anytimetools2  when I was working, my tool box(company owned) had Starrett, 6" calipers, 0-1" mic and 2 1"dial indicators 0.250" travel and 2 magnetic bases. I aligned elec motors to pumps, fans or what ever needed precision alignment
 
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I bought one of these a couple years ago and we had a flood around that time. I never uncrated it and it sat in my garage until recently.

I just unboxed it and I am having a problem right off the bat. Not too happy right now. It wants to stall out and I think there is something wrong with the power switch as well. I have not taken the time to tear into it yet, but def not too happy with it.

Too bad I didn't have time to set it up back when I got it in 2018.

I have wasted a lot of money on cheaper compressors, wish I would have just bought a good one and been done with it.
 
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TrinityMaker said:
I own this pump. I like it. The cylinder on the left if for low pressure, and the cylinder on the right is for high pressure. It's a 2 stage pump.

Now that's not to say I haven't had a learning curve with it. Here's what I've learned through trial and error. Don't run the pump for more than 20 minutes at a time. Let it cool and relax a bit between pumping cycles. They will send you a complete kit of replacement parts for it with the purchase. The one thing they won't send you are spare pistons. The proverbial "weak link" of this compressor is the piston on the high pressure side. It's basically similar to the dual functioning piston of the Yong Heng single cylinder compressor. If you push the piston too hard, the brass rod with the teflon split rings that seal in the HP cylinder wall with crack the top of the aluminum piston it's attached to. I speak from experience. So DO NOT exceed 4600 psi with the compressor. Also, run the air through a filter before it goes into your CF scuba tank, or your 480cc air rifle tank. The air is heavy with petroleum smell. So I run mine through a filter that has desiccant, cotton, and charcoal. Does a good job of giving me clean, dry air.

On my 90cu tank, I can go from 3800-4600psi in about 17-19 minutes. It pumps fast! Also, Don't turn off your compressor with the pressure at 4500 psi. Bleed off the air while the compressor is running. Shut the valve on your tank, and immediately turn the drain valve on the compressor while it's still running. This prevents the piston from slamming down with an instant cut off from power. I actually made a male foster to male foster one way HP check valve that goes between the compressor and the dive tank. I attach it to the female foster fitting on the air hose from the tank, open the valve, and the pressure from the tank shuts the valve. Then when the pressure from the compressor regulates with the pressure in the tank, the valve opens and the air starts to flow into the tank. No guessing about when to open or close the valve on the dive tank. Also, when you bleed the air from the compressor, and it drops below the pressure in the tank, the valve shuts again. So you don't need to have to rush to shut off the compressor after shutting the valve on the tank. You just close the valve on the tank, and the only air you're bleeding off is the air trapped in the HP fill hose connected to the tank.

I have LOTS of advice with this pump. Shoot me a PM or email if you want more.
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