How does a blowback actually work

[Acidd_UK]

From pulling the trigger, what sequence of events occurs to propel the paintball out of the barrel? I'm interested in a fairly technical explanation. The reason is, I am buying a maker that has the ventri and the asa drilled for high flow, but it needs a high flow valve to go lp. I want to get an understanding of how it works so I know what each bit does and when. Also, what are the benefits of a marker being low pressure?

Thanks guys,

Tom

PS Is this a good deal -

Blue shutter,
20oz Tank
10" CP Chrome barrel
Nickel Palmer Stabiliser
Clear sticky grips
Dye Chrome double trigger frame

$300 plus shipping / tax

 

[ciaran.mooney]

A paintball marker at a low pressure will be a lot quieter.

 

[vantrepes]

OK, on a blow back, here is what happens:

Trigger is pulled, this lowers the sear, and releases the hammer.

The hammer and bolt (they are linked by either a vertical pin, like a spyder, or an arm, like a Tippman) move forward because of tension on the main spring.

As the bolt/hammer move, a ball that is sitting in the path of the bolt is pushed into the breach, and the breach is sealed bu the bolt. Because the bolt is farther forward than the hammer, this all is complete a split second before....

The hammer hits the valve stem, opening the valve, and launching the ball.

As the valve opens, air is also directed out the back of the valve, around the vavle stem. This creates pressure in the area in front of the hammer, and forces it back, which, because of the link, pulls the bolt back also. This is why the hammer seal, AKA striker o-ring is so important to blow back guns, no seal, no recocking.

Because of the trigger design, the sear is already up, and ready to catch the hammer, even if the trigger hasn't been released.

So, as the hammer is forced back, it catches on the sear, and is held in place for the next shot.

Hope that's enough to give you the idea on how they work.
As for LP, quieter, less felt recoil, and easier on paint. You will need a good reg before you can run LP, so keep that in mind too.

 

[Acidd_UK]

Thanks, thats just what I was after. Ok, the venturi on my shutter has been drilled and I've got a Palmer stabiliser reg, (which I'm told is very good) what else do I need to go LP? I was told a high flow valve - where can I get one and what makes it higher flow than the standard valve?

Tom

 

[loginnut]

Low Pressure if it was you want its a side effect of efficiency. It will not increase the range and accuracy of your marker. I say just keep the stock valve and save some cash and use if for quality paint. Good choice on the stab make sure if its new you place a good deal of shots to break it in. LP on blowbacks is not really useful except for lowering the pressure of gas entering the marker or the pressure of gas needed for recocking but using co2 offers such a high shoot count in most cases its not worthwhile to pursue. Seems from your marker of choice your a budget orientated player so be selective about whos advice you take.

Chris

 

[Acidd_UK]

Cheers guys, thats good advice.

Tom