by: Pneumaddict
illustrations by: Diamus
Co2 in a properly filled bottle is basically gas that varies in density and potency. It becomes almost liquified near the bottom ! And almost light as air on top (vapor). The most dense co2 vapor (liquid) near the bottom will expand the most and has the most energy per portion, duration or volume. Liquid Co2 not only has pressure energy, but also has valuable expansion energy which is mostly lost in vapor systems! The expansion potential of liquid is not effected by temp. or rapid fire chilling like vapor pressure is. With a liquid feed conversion, expansion occurs in the action and barrel and puts the maximum amount of co2 energy possible behind the pellet. This adds 10-40% energy increase if done correctly! The gas consumption increases about 33%.
Many co2 guns can run on liquid with a few changes and adjustments. I'll use a 2240 with a DAQ breech as a common example. The stock breech could never contain the pressure.
New Valve Stem Seal
You need a delrin seal on your valve stem (Most suppliers can do this if you can't)
A normal valve stem seal will work for a bit but will freeze and crack causing a
leak after minimal liquid use. It may also over compress and/ or cause valve lock.
You need a white delrin stem seal and a perfectly polished seat, nothing else will
seal after getting the cold beating a liquid valve gets.Valve Porting
The valve needs porting. The thicker liquid flow is more effective without sharp corners to go around.Clear the CO2 Path
Any check valve, slide check, pin, filter, piercing, assembly, or obstruction from the tank to the valve must be eliminated. (Your gun must be converted to dedicated bulk, obviously).*****DANGER****** NO CHECK VALVE!
Make sure there is NO check valve on the gun or bulk adapter! It can trap 100% liquid in the gun and explode!Minimize Volume
All volume between the tank and valve must be minimized. No remote line or hoses can be used. The pure liquid can only reach the valve if it has no place to expand. (A fake co2/tank top F/ASA. is the best way to do a 2240). Any pressure vessel or expansion chamber must be filled to eliminate volume.Siphon Tank
I can make this for you. You can also do it yourself, install a brass or copper
siphon tube in a co2 tank pin valve, but be careful! Get a pro to do it if you
are not handy with a torch and silver solder!
***If you damage the tank it is garbage!
Use blue locktite or teflon to reassemble the tank and syphon pin valve.***DANGER***Never use a tank with an on/off valve
The vapor volume in the tank is a buffer for any pressure spike inside your 100% liquid filled gun!!! READ THE PRESSURE CHART ABOUT 100% LIQUID CO2 PRESSURES! If an on/ off valve is closed accidentally trapping 100% liquid, the temp. changes, KaBoooom!!
***Use Pin Valves only!!!Springs
You will need an assortment of springs.
a. A longer/ lighter return spring
b. heavier hammer spring
* The exact hammer spring needed will vary, testing each gun with a chrony will determine the best power/gas ratio and consistency.Modified Valve Stem
Any pin must be removed and the OD must be reduced. You need to streamline the head, it needs to cut through a thicker substance than it was made for. The flat parts and sharp corners against the thick flowing liquid will not let the valve open completely. Make it more aerodynamic.
Chuck stem in a drill and work the top edges smooth. A slightly bullet shape is good, but don't take too much away, there will still be a step.Valve Installation. PAY CLOSE ATTENTION, IMPORTANT STEP!
Your valve will now operate much different (Hard). It will endure higher pressures, endure stronger forces and operate in harsher conditions. The momentum of a liquid blocked by a closing valve is a strong jolt and puts much extra stress on the mount. A 2240 valve needs a second set screw or a pin through it to secure it to the tube. Make sure the valve is secure and firm, shim the valve to eliminate any movement.
***Not every airgun can be modified to operate on liquid. The 2240 is easy to do. Some airguns need major internal revisions and some should not be converted for various mechanical reasons or structural limitations.
*****DISCLAIMER******
**YOU CAN DIE!
**This is meant for Information purposes only!
**This is what I do!
**I am in no way suggesting that anybody should attempt this procedure!
**This is NOT safe if completed incorrectly!
About the Author:
You can contact the author by using the following information:
600-451-38-150-112-mk1-E-262-78g
gas pistols
Rebuild-Upgrade
Early American Airguns
pneumaddict@canada.com
Alex
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