If you buy this paintball bottle you have one with a pin valve. And thats less handy. But yes, you can screw on a 1/2 bsp adaptor straight on.
Better is to use a paintball adaptor(or an adaptor made for it) then you can use the O-ring on the valve.
Please ensure that any gas storage vessel you use is supplied with suitable certification.
What certification would I need to make it legal? Im guessing most people selling stuff on ebay wouldnt have certification showing what pressure their items are rated to. Any ideas where I could obtain these? Or people who sell tanks with certification?
Cheers
A certified pressure vessel carries its own certification. Its stamped in the top of the pressure vessel, or another suitable spot.
@ Rhys
Questions.....
What is your present / intended pneumatic design?
Got any bits yet?
Is price a big issue?
Woody
(Message edited by woody on May 12, 2006)
My goal is to make a simple, but reasonably effective low pressure flipper. The current design/ideas is to have a compressor with a pressure switch for filling the tank on board.
Ive currently got a 40mm bore, 100mm stroke ram, and a soda stream bottle. I intend on using one of the 5 port low pressure valves from technobots. Like I said, nothing killer, but just something to get to grips with pneumatics. I dont want to go jumping in the deep end with CO2, this is just for experimenting, learning, and then hopefully adapting it into an ok weapon.
Price is always an issue isnt it :P Thats why I was hoping I could use the sodastream botle, rather than have to blow another £30 on a paintball bottle. I havent set a limit, so itll cost what it costs.
You can use a soft drink bottle for a low pressure buffer. These will survive at 100 psi and are very light. At what pressure will you set the pressure switch?
I started with compressed LP air before moving on to CO2.
Looking for 100psi. I wouldnt feel too comfortable with a drinks bottle. Will they really take 100psi? They seem a bit flimsy.
I just read the FRA build rules. They limit gas bottles to 50 psi without certification. You can always test these things. The biggest problem I had with coke bottles was the lids blowing off.
Quote from Giant Robo
I use epoxy in El Bravos` bottle caps.
Make the pipes going into the bottle about an inch or two long so the ends don`t get glue in them.
Sand the inside of the bottle neck so the glue will stick then completely fill the cap with epoxy and screw on the bottle from above. Hold the bottle upside down until the epoxy cures. You`ll feel the cap get nice and hot.
Your`e pipes will not leak or blow off and it strengthens the cap.
Make sure you mix, pour and screw on the bottle quickly before the epoxy starts to go off so it is still runny and will flow and seal the neck.
For El bravo I use two 1.25 litre PET bottles. They were fine at 100psi but to go higher with confidence I covered them in fiberglass and also the caps were filled with epoxy before being screwed on so they don`t leak and won`t blow off. I plan to give them another layer of glass; three all up and within the safety of the arena, pump them up to 200psi and then have another bot bash them around a bit. Then, if there`s no big bang! I`ll feel safe to put them up to 150 psi regularly.
Philip,
The FRA build rules are not negotiable, rule 8.3 clearly states that any pressure vessel that is not certified is limited to 50psi... end of story!
Therefor your idea of testing in an arena at 200psi or even running it at 100psi just aint going to happen as no event organiser would allow it.
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