Booster pump

[melloroadman]

With the big bores I have it is hard to feed them from time to time . So I bought one of the booster pumps and used a regulator I had to lower the power to the pump down to 100 psi . I can now fill my rifles from as little as 500 psi tank pressure and boost it up to 4500 psi if I like . It is not as compact as what some hunters have done but it is much easier and cheaper as well .Marvin

[kiwi]

What a optune post....

I am playing around with a design for something
very simular...The only diffrents is.. it uses a 10ton
porta-power pump for power...If my calulations are correct
I should be able to use my argon bottle down to
700psi before theres not enough bottle pressure
to reach 3000psi...should be able to get 900top ups
of 1500psi from a 11cubic metre bottle..minus
what yer lose in bleed off...
11cubic metres = 389cubic feet..5 x  80cf scuba tanks

My pump will have a 12mm bore with 300mm stoke...
If I went to a 622mm stroke I could use a normal
compresser at 120psi....

Pete

[DonTMN]

Can I get more information please?  
I am not sure what/how you are doing this but it sounds interesting to say the least..

Maybe some more pics, costs, and diagrams.  Also part numbers would be great.  I especially like the ability to use a 120psi compressor air and boosting it to 3000psi ++ or use air under 2,000psi from my scuba tank and boost it to a useable pressure.

Looking at the pics it looks like you can go from the tank (air source)  directly to the reserve tank &/or from the Tank thru the valve and then back to the reserve or rifle, is this correct?

How is the pressure boosted, by that little handle to the right of the black box on the brass valve???

I shoot exclusively PCP and was considering a big bore but since I use only scuba tanks at 3000psi I have been shying away from the big bores...

Thanks,
DonTMN

[melloroadman]

This is where I purchased the pump . The article should answer most of your questions . You might have to read it several times but there is a lot of info in it . Let me know if you need more help .Marvin
http://cgi.ebay.com/Paintball-SCUBA-Ram-Air-Gas-Booster-HPA-Air-Rifle-Pump_W0QQitemZ390167844582QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item5ad7d0d6e6

[Gene_SC]

Thanks Marvin for sharing with us. One question. Are all the parts rated at 4500 psi?  Where is your air source?

[melloroadman]

Gene I started out with a 3000 psii tank . Then I added a compressor that is rated at 3500 psi . Next were two moe 3300 psi tanks . Then came the booster . This gives me way more air supply than a 4500 psi tank . The regulator is rated at 6000 psi but a oxygen welding regulator from harbor tool for about $ 50.00 will work . I had this one already for accurate fills out of my tanks so I used it . The rest is rated at above 4000 psi but with me using tank pressures at 3000 -3300 psi and keeping the fill of my rifles below 4000 psi I am safe and so would a welding regulator be as long as you keep your tank pressure at 3000 psi or lower . Hope this answerers your questions .Marvin

[21grains]

The paintball shop here use's a booster to boost  nitrogen from large tank to 5000 psi and stores it in another tank to do fills for 4500 cf tanks.I have a 110ci cf tank only $2 a  fill ,why pump Your A$$ off.....Franky

[kiwi]

Melloroadman systems works as....
It works because of the diffrent surface areas
of the 2 pistons in the little black pressure multiplyer.

If the large piston has a surface area of 5sq inchs &
the small one it pushs has a surface area 1 sq inch..
that means with a 3000psi tank....The large piston has
 a pressure of 15,000psi pushing it & the small one has only
3000psi resistance on it...so the large piston with 15,000psi
is able to push the smal one to increasse the pressure in what
ever its conected to above the bottle pressure...
The only draw back with it is the amount of air that is lost dueing
 bleed off...looking at it  could be as much as 100ccc....

this system is used in all air over hydrulic system...
There are 120ton air over hydrulic jack that use 120psi of air
the produce a hydrulic force of 120 ton....
The only diffrents with this air gun system is its" air over air"

The system I descibed is simular but diffrent..in that it uses 2 pistons of diffrent
surface areas to produce or increasse pressure....
just imagine a  single stroke pump with a 10 ton hydrulic ram pushing it..
with the right volumes can be feed from the tank that has reached a
unuseable pressure or from a standard compresser...the compresser
would only be to reduce the amount of strokes needed and the size of the
pump....120psi = 6 x air pressure

There is another way...."Deplacement"
would be a pressure vessal that can stand 3000psi..
fill it with air from a compresser to 120psi then pump hydrulic fluid in the bottom
it would increasse the  pressure in the vessal forceing the air out the top & incressing
the pressure in the vessal and what ever its conected to....It would need a bladder
or simular to stop oil vapor in the air....Or maybe a floating piston with wiper rings
The piston wouldn't need to seal pressure as the pressure would always be the
same on each side of the piston....

Hope this is clear and not to fuzzy....

Pete

[Gene_SC]

Marvin thanks for explaining this to us. It takes me a while forit to sink in..:) What kind of compressor are you using. And where does the gun fit in? before the tanks or after the compressor? Is the booster pump electic?

[melloroadman]

I have the same compressor that J has or had a year or two ago that I believe you saw in person at one of the shoots . Here are a couple more pictures for you . Also if you read the attached site article were I bought the pump you will under stand better . The pump is made to work off a shop compressor at 100 psi . All I did was install a regulator to lower the tank pressure down to 100 psi so I can take the pump to the range with me . When I get home I can un hook the red hose from the pump and hook up a shop compressor and drive the pump with it . You do not need the regulator if you are going to use it at home with your compressor as long as your compressor is under 100 psi . You have a 4500 psi tank I believe . If you have a full tank and run it down to were you can not fill the rifle any longer you can then hook up the pump and continue to fill the rifle with the pump till there is only 500 psi of air in the tank . The thing is that the pump compresses 50 to one so when you are using it the volume of air that you take out of the tank is very small and the tank pressure does not drop off fast as it does under normal conditions . If you plum every thing to a 4500 plus psi rating then you can take the pump pressure up higher as well . I do not fill my guns above 4000 psi so I saved a few doll ors by setting the limit to 4000 psi . The cost of fittings can get costly at above 45000 psi . Here is the link were I bought the pump . Marvin
http://cgi.ebay.com/Paintball-SCUBA-Ram-Air-Gas-Booster-HPA-Air-Rifle-Pump_W0QQitemZ390167844582QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item5ad7d0d6e6

[preez]

Marvin, your booster is way cool! I think I understand how it works except one thing - do you have to continously "pump" it to get to the higher pressure and proper volume to fill a gun or it a one time shot?

Chris

[melloroadman]

It is non reciprocating . So you lift the handle one time for one boost cycle. But to help you understand . I have 3300 psi in tank and the rifle has 2000 psi and the rifle holds about 250 cc . I very carefully lift the handle and watch the gauge . It will take one or less pump cycles to fill the rifle to 3500 psi. If the same rifle is filled with a tank pressure of 1800 psi it will take about five pump cycles to fill the rifle . Remember you are boosting 50 to 1 . Easy does it and it is easy and fast .Marvin

[preez]

Thanks Marvin, I get it now - lower start pressure = more cycles.

Chris