Assorted Pneumatics Questions

[Mouldy]

What size buffer - You need atleast 3X the volume of the rams in a robot...industry use 5x but 3 is enough for a robot.

What valve = Bigger is always better in turbulence I have a highflow valve that came from EWE 2..Flowrate even went as big as to use a 1/2 valve in a feather.

Reg...umm Woody would be best to answer that?

what size bottle = Most people in the UK use 600g of co2 witch should last 5mins easily.

Dave moulds
Team Turbine

[knightrous]

lol, after looking at todays Marauder battling video, it seems Philip has temporarily mount a 5L pressure pump tank onto the top of Marauder and is using his 600g aluminium tank as a buffer Definately looks funny with this 5L tank mounted on the top of the robot

[philip_taylor]

Thank you, Dave.

I would like to use a 3*2 spring return valve. What does everyone think is the best choice there? I have read that some 1/4 valves have the same flow rate and pressure drop as 1/2 valves. Would anyone care to comment?

Thankyou for your help

Philip Taylor

And one more question that recently occurred to me : If I use a compressor system at higher than 50psi, Im assuming Ill need to get my buffer etc certified (or find one that already is), but what about the pressure relief valve? If I just stick a 10bar PRV somewhere in the circuit would that comply with the rules?

Thanks

-- Kev

p.s. Oh and does anyone have any LP bits (not rams unless theyre very cheap but anything else) theyre trying to offload? Cheers.

Can I use soda stream bottles on their side? I havent used CO2 before. I will regulate the pressure to 10 bar.I have read that with other bottles you would normally put in a dip tube into the top gas filled part of the bottle. I would need to have the soda stream bottle positioned on its side. Would that be an issue? How would I solve any problems this may cause?

You should at least angle the bottle so that the valve is higher than the base .....say 15 degrees?

Thanks, Woody. I will look at the shape again.

What happens when the robot is upside down? The regulator would be getting liquid CO2. What does this do to the reg?

It freezes up the reg. It takes some time before the reg will function properly again. A solution is to stick a coil of thin copper tube (large surface arena etc) between the bottle and the reg. That tends to give the CO2 enough opportunity to change state into a gas.

Thanks alot Eddie. Has anyone tried the expantion chambers that they use for paint ball guns to stop the regs from freazing?