Nah it would be to bulky for my kind of gun. I'm thinking poppet valve but i'm not sure.
How it works? well basicly there is a big chamber then a 1-way valve leading into a coax piston setup. Fill the gun up pull the valve pilots the piston then the air coming back into the piston setup reseals the piston.
I don't think it is possible to have a 1 way valve... 'ways' mean the number of ports so, for example, a ball valve is a 2 way valve
I know what you are looking for but it won't be easy.... I suppose you could achieve what you want with a NO closed 3 way valve that would vent pilot side to a small sealed chamber once actuated and then that air would be released to atmosphere once you depress the valve
that's not an ideal solution as it requires you to have a small chamebr just in order to keep vented air
Quote:
poppet valve but I'm not sure.
How it works?
poppet valves are not balanced so they might not be ideal for high pressure guns
Poppets are often just small rubber disks not what you could see above...
EDIT
read this too... it explains the differences between poppet and spool valves as well as a couple of other things (plus it has better pics)
EDIT no 2
ohh god this is the source I mentioned in johnbunsenburner's thread (all in one valve) it discusses metal-to-metal seals
(in other words - no seals per se)
Joined: 15 Mar 2007 Posts: 18051 32498.46 Spud Bux
With a properly made piston (good piston fit, maybe o-ringed to make sure, and small pilot volume) even a schrader will be more than adequate. In the past I've used a schrader to pilot pistons as big as 25mm without the benefit of seals, just a tight fit.
@JSR
I think he wants to achieve a similar effect that you get when using hammer valves as the main valve.... so in other words he wants to use just a small fraction of air from the chamebr for each shot
the important question is what you want to build...
if you compare what BTB built and what I used on the MKIII (3 way valve + QEV) air consumption is comparable...
so it's more a matter of personal preference
For me it's ok to have an external tank to store air as I want a lot of shots. There is no way I could store enough air needed for 15 or more shots in the main chamber...
but if you want a self contained launcher that can fire a couple of shots then the design that BTB used is better
Joined: 15 Mar 2007 Posts: 18051 32498.46 Spud Bux
I can link you to my attempt with a schrader pilot, it worked well at compressor pressures but not with HPA, though I put this down to poor piston design (solid rubber as opposed to my usual casting) because the theory is sound.
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