@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 ?