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ok here is the basic run down on co2 vs hpa
co2, is self regulating in a sence, when it is compressed it goes to a liquid form, right at around 750 psi, so when you are shooting and it is going back into a gas form it is already at 750 psi, so basically your tank has aproximatly 750 psi in it at all times even when there is not much liquid co2 in the tank, this is also why the co2 tanks get cold, because when the co2 is going from a liquid to a gas is sucks in any surounding heat. but the major flaw of co2 is that depending on the temperature, the pressure in the tank can change, so if its a hot sunny day the co2 will go from a liquid to a gas at 800 psi instead of 750, if its cold it could be 700 psi. also if the liquid co2 gets into your marker it can do some not so good things, as it expands it gets cold, that cold is not good for any o rings or seals, have you ever seen what looks like snow coming from your barrel? thats why, a bit of the liquid came all the way through. (expansion chambers allow space for the co2 to expand b 4 it gets to the workings of the marker) also since co2 is cold it will cool down your barrel, this makes condensation colect on the inside of the barrel, affecting accuracy
hpa, is either stored in the tank at 3000 psi or 4500 psi, then goes through a regulator on the tank that generally brings it down to a constant 750 or so psi, then generally goes through another regulator on the marker to further reduce it. (this is generally on higher end markers, a 98c could run straight off of the tank at 750 psi or so) so even if its hot out a hpa tank will still be putting out the same psi no matter what, at the same temperature as the surrounding air so theres also no condensation. thats where hpa is more consistant than co2, also co2 can very a bit from shot to shot, depending on how it expands, one shot may be at 300 fps the next at 280 and the one after that at 310, thats a bit extreme but not unheard of.
so for hpa even if theres only 1000 psi left in the tank the regulator will still be putting out 750psi untill the psi in the tank drops below 750.
did this help any?
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