1000psi PRV

[robotwars]

Yeah roger plant using nitrogen in wheelie big cheese !!

[Mouldy]

just ordered one, came to £23.39 with shipping etc...

When i get it, ill hook it up directly to a co2 nut , screw it onto the bottle and post results for anyone who's in need of one...will be after telford though as ive got no co2 here :sad: ...thanks in advance for your co2 Alan :P

Jonny- if this one doesnt turn up/work ill be interested

[maddox10]

Interesting site. The springs I need for the PRV's are almost as expensive as those 60 bar PRV's.

Also, the PRV doesn't have to be rated at 1000psi, it's the max allowed by the rules.

[beast]

@John
what you and I are trying to say is whats the point in a 1000 psi valve when

a co2 bottle at proper weight ie 2kg no more is filled properly to 42 BAR whick is 617 psi
ok if its hotter the bottle presure will be higher (we all know that) but when people are useing buffer tanks and we fill the system we are normally filling say another 2kg of empty tank which does 1/2 the presure I have tested this (not on a hot day) and the presure was 350 psi now a 1000 psi valve will never blow off i have had one in the system for over 10 years now and it has never blown off.
as long as the bottle is never over filled you should not have a problem.

and as we always arm the robot in the areana having a safty valve which does not blow off in my opinion is a waste of time as it does not make the robot any safer
Also burket valves are rated to 50 bar which also is less than 1000 psi of which i have uesed for over 10 years as well
so Can i ask whats the point if we are only going to use CO2 ?

[Mouldy]

Alternatively John you could prove with certification that your entire setup will operate safely on 3000psi

Just because you have massive buffer tanks and know not to fill your bottle to the max when it's frozen on a hot day doesn't mean everyone else does...

[beast]

N2O the way to go then

i think not

[widow_twanky]

Dave stand corrected...

I thought that if you can't ever get 1000psi in the system then what's the point.
Just looked at a burst disc, didn't realise they were at 3000psi!!

Take it back, just something I've been thinking about over the last few months.

John

The 3000psi burst disc is to protect the tank. In theory (if you haven't thrown it around, refilled it countless times, subjected it to impacts with an xe or thrown it six foot in the air numerous time) the disc will go well before the tank blows up. We tried this recently on one of our sites with a bottle of propane and a welder which was interesting, trying to explain to people that things worked as they sould when you discharge a full bottle of propane through the burst disc and it's on fire is challenging as well .

As for the 1000psi prv I had heard it was very much introduced as a fair play device (I think it was Geoff told me that). Seem to recall it was to stop people artificially heating the bottles and gaining an advantage due to the increase in pressure. Lots of ranting about people running bottles under hot water taps who should know better followed but the first bit sounded sensible

[Gasbot]

Back in the day we did have the PRV blow off. Was a nice warm day and 4Kg of CO2 on board - PRV opened as soon when I opened each bottle - queue a huge cloud of CO2 and a rather nervous me. Can't really see the point myself though as our system is more than capable of 1000psi not to mention once the gas starts flowing the bottles won't stay at high pressure for long anyway. I think the PRV's were introduced to keep the hydraulics people happy - I do remember being accused of cheating in a competition once as someone thought we had over filled our tiny 1.1 Kg bottle...

Personally I'd say the PRV is more of a mechanical force limiter to protect our chassis from bending rather than prevent the gas system exploding.

[blazerbotics]

I have had mine blow twice when the bottles were warm. I think we have to have a PRD, if not there are no safety devices at all in the system. As John said, Burkerts are only rated for 50bar (although i do seem to remember Mike Lambert getting some tested to 90bar) so we are running them over what they were designed for some times.

[team_mute]

Does everyone have them tested, only ask because we use casting for some of our kit and each one is tested, we had identical castings cast as the same time and same pattern and one past @ 90bar and the other only reached 70bar before it failed, not all casting are equal.

Mute doesn't use burkerts so I haven't got a clue about them, we use cryogenic valves rated for 100bar operating pressure with our billets valves